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element 级联选择器 ElementPlus Cascader 级联选择器

2023-06-19 19:17

element 级联选择器 ElementPlus Cascader 级联选择器

element 级联选择器 ElementPlus Cascader 级联选择器

element 级联选择器

Cascader 级联选择器

当一个数据集合有清晰的层级结构时,可通过级联选择器逐级查看并选择。

基础用法

有两种触发子菜单的方式


只需为 Cascader 的options属性指定选项数组即可渲染出一个级联选择器。通过props.expandTrigger可以定义展开子级菜单的触发方式。

<template>
  <div class="block">
  <span class="demonstration">默认 click 触发子菜单</span>
  <el-cascader
    v-model="value"
    :options="options"
    @change="handleChange"
  ></el-cascader>
</div>
<div class="block">
  <span class="demonstration">hover 触发子菜单</span>
  <el-cascader
    v-model="value"
    :options="options"
    :props="props"
    @change="handleChange"
  ></el-cascader>
</div>
</template>

<script>
  export default {
    data() {
      return {
        value: [],
        props: { expandTrigger: "hover" },
        options: [
          {
            value: "zhinan",
            label: "指南",
            children: [
              {
                value: "shejiyuanze",
                label: "设计原则",
                children: [
                  {
                    value: "yizhi",
                    label: "一致",
                  },
                  {
                    value: "fankui",
                    label: "反馈",
                  },
                  {
                    value: "xiaolv",
                    label: "效率",
                  },
                  {
                    value: "kekong",
                    label: "可控",
                  },
                ],
              },
              {
                value: "daohang",
                label: "导航",
                children: [
                  {
                    value: "cexiangdaohang",
                    label: "侧向导航",
                  },
                  {
                    value: "dingbudaohang",
                    label: "顶部导航",
                  },
                ],
              },
            ],
          },
          {
            value: "zujian",
            label: "组件",
            children: [
              {
                value: "basic",
                label: "Basic",
                children: [
                  {
                    value: "layout",
                    label: "Layout 布局",
                  },
                  {
                    value: "color",
                    label: "Color 色彩",
                  },
                  {
                    value: "typography",
                    label: "Typography 字体",
                  },
                  {
                    value: "icon",
                    label: "Icon 图标",
                  },
                  {
                    value: "button",
                    label: "Button 按钮",
                  },
                ],
              },
              {
                value: "form",
                label: "Form",
                children: [
                  {
                    value: "radio",
                    label: "Radio 单选框",
                  },
                  {
                    value: "checkbox",
                    label: "Checkbox 多选框",
                  },
                  {
                    value: "input",
                    label: "Input 输入框",
                  },
                  {
                    value: "input-number",
                    label: "InputNumber 计数器",
                  },
                  {
                    value: "select",
                    label: "Select 选择器",
                  },
                  {
                    value: "cascader",
                    label: "Cascader 级联选择器",
                  },
                  {
                    value: "switch",
                    label: "Switch 开关",
                  },
                  {
                    value: "slider",
                    label: "Slider 滑块",
                  },
                  {
                    value: "time-picker",
                    label: "TimePicker 时间选择器",
                  },
                  {
                    value: "date-picker",
                    label: "DatePicker 日期选择器",
                  },
                  {
                    value: "datetime-picker",
                    label: "DateTimePicker 日期时间选择器",
                  },
                  {
                    value: "upload",
                    label: "Upload 上传",
                  },
                  {
                    value: "rate",
                    label: "Rate 评分",
                  },
                  {
                    value: "form",
                    label: "Form 表单",
                  },
                ],
              },
              {
                value: "data",
                label: "Data",
                children: [
                  {
                    value: "table",
                    label: "Table 表格",
                  },
                  {
                    value: "tag",
                    label: "Tag 标签",
                  },
                  {
                    value: "progress",
                    label: "Progress 进度条",
                  },
                  {
                    value: "tree",
                    label: "Tree 树形控件",
                  },
                  {
                    value: "pagination",
                    label: "Pagination 分页",
                  },
                  {
                    value: "badge",
                    label: "Badge 标记",
                  },
                ],
              },
              {
                value: "notice",
                label: "Notice",
                children: [
                  {
                    value: "alert",
                    label: "Alert 警告",
                  },
                  {
                    value: "loading",
                    label: "Loading 加载",
                  },
                  {
                    value: "message",
                    label: "Message 消息提示",
                  },
                  {
                    value: "message-box",
                    label: "MessageBox 弹框",
                  },
                  {
                    value: "notification",
                    label: "Notification 通知",
                  },
                ],
              },
              {
                value: "navigation",
                label: "Navigation",
                children: [
                  {
                    value: "menu",
                    label: "NavMenu 导航菜单",
                  },
                  {
                    value: "tabs",
                    label: "Tabs 标签页",
                  },
                  {
                    value: "breadcrumb",
                    label: "Breadcrumb 面包屑",
                  },
                  {
                    value: "dropdown",
                    label: "Dropdown 下拉菜单",
                  },
                  {
                    value: "steps",
                    label: "Steps 步骤条",
                  },
                ],
              },
              {
                value: "others",
                label: "Others",
                children: [
                  {
                    value: "dialog",
                    label: "Dialog 对话框",
                  },
                  {
                    value: "tooltip",
                    label: "Tooltip 文字提示",
                  },
                  {
                    value: "popover",
                    label: "Popover 弹出框",
                  },
                  {
                    value: "card",
                    label: "Card 卡片",
                  },
                  {
                    value: "carousel",
                    label: "Carousel 走马灯",
                  },
                  {
                    value: "collapse",
                    label: "Collapse 折叠面板",
                  },
                ],
              },
            ],
          },
          {
            value: "ziyuan",
            label: "资源",
            children: [
              {
                value: "axure",
                label: "Axure Components",
              },
              {
                value: "sketch",
                label: "Sketch Templates",
              },
              {
                value: "jiaohu",
                label: "组件交互文档",
              },
            ],
          },
        ],
      }
    },
    methods: {
      handleChange(value) {
        console.log(value)
      },
    },
  }
</script>

禁用选项

通过在数据源中设置 disabled 字段来声明该选项是禁用的


本例中,options指定的数组中的第一个元素含有disabled: true键值对,因此是禁用的。在默认情况下,Cascader 会检查数据中每一项的disabled字段是否为true,如果你的数据中表示禁用含义的字段名不为disabled,可以通过props.disabled属性来指定(详见下方 API 表格)。当然,value、label和children这三个字段名也可以通过同样的方式指定。

<template>
  <el-cascader :options="options"></el-cascader>
</template>

<script>
  export default {
    data() {
      return {
        options: [
          {
            value: "zhinan",
            label: "指南",
            disabled: true,
            children: [
              {
                value: "shejiyuanze",
                label: "设计原则",
                children: [
                  {
                    value: "yizhi",
                    label: "一致",
                  },
                  {
                    value: "fankui",
                    label: "反馈",
                  },
                  {
                    value: "xiaolv",
                    label: "效率",
                  },
                  {
                    value: "kekong",
                    label: "可控",
                  },
                ],
              },
              {
                value: "daohang",
                label: "导航",
                children: [
                  {
                    value: "cexiangdaohang",
                    label: "侧向导航",
                  },
                  {
                    value: "dingbudaohang",
                    label: "顶部导航",
                  },
                ],
              },
            ],
          },
          {
            value: "zujian",
            label: "组件",
            children: [
              {
                value: "basic",
                label: "Basic",
                children: [
                  {
                    value: "layout",
                    label: "Layout 布局",
                  },
                  {
                    value: "color",
                    label: "Color 色彩",
                  },
                  {
                    value: "typography",
                    label: "Typography 字体",
                  },
                  {
                    value: "icon",
                    label: "Icon 图标",
                  },
                  {
                    value: "button",
                    label: "Button 按钮",
                  },
                ],
              },
              {
                value: "form",
                label: "Form",
                children: [
                  {
                    value: "radio",
                    label: "Radio 单选框",
                  },
                  {
                    value: "checkbox",
                    label: "Checkbox 多选框",
                  },
                  {
                    value: "input",
                    label: "Input 输入框",
                  },
                  {
                    value: "input-number",
                    label: "InputNumber 计数器",
                  },
                  {
                    value: "select",
                    label: "Select 选择器",
                  },
                  {
                    value: "cascader",
                    label: "Cascader 级联选择器",
                  },
                  {
                    value: "switch",
                    label: "Switch 开关",
                  },
                  {
                    value: "slider",
                    label: "Slider 滑块",
                  },
                  {
                    value: "time-picker",
                    label: "TimePicker 时间选择器",
                  },
                  {
                    value: "date-picker",
                    label: "DatePicker 日期选择器",
                  },
                  {
                    value: "datetime-picker",
                    label: "DateTimePicker 日期时间选择器",
                  },
                  {
                    value: "upload",
                    label: "Upload 上传",
                  },
                  {
                    value: "rate",
                    label: "Rate 评分",
                  },
                  {
                    value: "form",
                    label: "Form 表单",
                  },
                ],
              },
              {
                value: "data",
                label: "Data",
                children: [
                  {
                    value: "table",
                    label: "Table 表格",
                  },
                  {
                    value: "tag",
                    label: "Tag 标签",
                  },
                  {
                    value: "progress",
                    label: "Progress 进度条",
                  },
                  {
                    value: "tree",
                    label: "Tree 树形控件",
                  },
                  {
                    value: "pagination",
                    label: "Pagination 分页",
                  },
                  {
                    value: "badge",
                    label: "Badge 标记",
                  },
                ],
              },
              {
                value: "notice",
                label: "Notice",
                children: [
                  {
                    value: "alert",
                    label: "Alert 警告",
                  },
                  {
                    value: "loading",
                    label: "Loading 加载",
                  },
                  {
                    value: "message",
                    label: "Message 消息提示",
                  },
                  {
                    value: "message-box",
                    label: "MessageBox 弹框",
                  },
                  {
                    value: "notification",
                    label: "Notification 通知",
                  },
                ],
              },
              {
                value: "navigation",
                label: "Navigation",
                children: [
                  {
                    value: "menu",
                    label: "NavMenu 导航菜单",
                  },
                  {
                    value: "tabs",
                    label: "Tabs 标签页",
                  },
                  {
                    value: "breadcrumb",
                    label: "Breadcrumb 面包屑",
                  },
                  {
                    value: "dropdown",
                    label: "Dropdown 下拉菜单",
                  },
                  {
                    value: "steps",
                    label: "Steps 步骤条",
                  },
                ],
              },
              {
                value: "others",
                label: "Others",
                children: [
                  {
                    value: "dialog",
                    label: "Dialog 对话框",
                  },
                  {
                    value: "tooltip",
                    label: "Tooltip 文字提示",
                  },
                  {
                    value: "popover",
                    label: "Popover 弹出框",
                  },
                  {
                    value: "card",
                    label: "Card 卡片",
                  },
                  {
                    value: "carousel",
                    label: "Carousel 走马灯",
                  },
                  {
                    value: "collapse",
                    label: "Collapse 折叠面板",
                  },
                ],
              },
            ],
          },
          {
            value: "ziyuan",
            label: "资源",
            children: [
              {
                value: "axure",
                label: "Axure Components",
              },
              {
                value: "sketch",
                label: "Sketch Templates",
              },
              {
                value: "jiaohu",
                label: "组件交互文档",
              },
            ],
          },
        ],
      }
    },
  }
</script>

可清空

通过 clearable 设置输入框可清空


<template>
  <el-cascader :options="options" clearable></el-cascader>
</template>

<script>
  export default {
    data() {
      return {
        options: [
          {
            value: "zhinan",
            label: "指南",
            children: [
              {
                value: "shejiyuanze",
                label: "设计原则",
                children: [
                  {
                    value: "yizhi",
                    label: "一致",
                  },
                  {
                    value: "fankui",
                    label: "反馈",
                  },
                  {
                    value: "xiaolv",
                    label: "效率",
                  },
                  {
                    value: "kekong",
                    label: "可控",
                  },
                ],
              },
              {
                value: "daohang",
                label: "导航",
                children: [
                  {
                    value: "cexiangdaohang",
                    label: "侧向导航",
                  },
                  {
                    value: "dingbudaohang",
                    label: "顶部导航",
                  },
                ],
              },
            ],
          },
          {
            value: "zujian",
            label: "组件",
            children: [
              {
                value: "basic",
                label: "Basic",
                children: [
                  {
                    value: "layout",
                    label: "Layout 布局",
                  },
                  {
                    value: "color",
                    label: "Color 色彩",
                  },
                  {
                    value: "typography",
                    label: "Typography 字体",
                  },
                  {
                    value: "icon",
                    label: "Icon 图标",
                  },
                  {
                    value: "button",
                    label: "Button 按钮",
                  },
                ],
              },
              {
                value: "form",
                label: "Form",
                children: [
                  {
                    value: "radio",
                    label: "Radio 单选框",
                  },
                  {
                    value: "checkbox",
                    label: "Checkbox 多选框",
                  },
                  {
                    value: "input",
                    label: "Input 输入框",
                  },
                  {
                    value: "input-number",
                    label: "InputNumber 计数器",
                  },
                  {
                    value: "select",
                    label: "Select 选择器",
                  },
                  {
                    value: "cascader",
                    label: "Cascader 级联选择器",
                  },
                  {
                    value: "switch",
                    label: "Switch 开关",
                  },
                  {
                    value: "slider",
                    label: "Slider 滑块",
                  },
                  {
                    value: "time-picker",
                    label: "TimePicker 时间选择器",
                  },
                  {
                    value: "date-picker",
                    label: "DatePicker 日期选择器",
                  },
                  {
                    value: "datetime-picker",
                    label: "DateTimePicker 日期时间选择器",
                  },
                  {
                    value: "upload",
                    label: "Upload 上传",
                  },
                  {
                    value: "rate",
                    label: "Rate 评分",
                  },
                  {
                    value: "form",
                    label: "Form 表单",
                  },
                ],
              },
              {
                value: "data",
                label: "Data",
                children: [
                  {
                    value: "table",
                    label: "Table 表格",
                  },
                  {
                    value: "tag",
                    label: "Tag 标签",
                  },
                  {
                    value: "progress",
                    label: "Progress 进度条",
                  },
                  {
                    value: "tree",
                    label: "Tree 树形控件",
                  },
                  {
                    value: "pagination",
                    label: "Pagination 分页",
                  },
                  {
                    value: "badge",
                    label: "Badge 标记",
                  },
                ],
              },
              {
                value: "notice",
                label: "Notice",
                children: [
                  {
                    value: "alert",
                    label: "Alert 警告",
                  },
                  {
                    value: "loading",
                    label: "Loading 加载",
                  },
                  {
                    value: "message",
                    label: "Message 消息提示",
                  },
                  {
                    value: "message-box",
                    label: "MessageBox 弹框",
                  },
                  {
                    value: "notification",
                    label: "Notification 通知",
                  },
                ],
              },
              {
                value: "navigation",
                label: "Navigation",
                children: [
                  {
                    value: "menu",
                    label: "NavMenu 导航菜单",
                  },
                  {
                    value: "tabs",
                    label: "Tabs 标签页",
                  },
                  {
                    value: "breadcrumb",
                    label: "Breadcrumb 面包屑",
                  },
                  {
                    value: "dropdown",
                    label: "Dropdown 下拉菜单",
                  },
                  {
                    value: "steps",
                    label: "Steps 步骤条",
                  },
                ],
              },
              {
                value: "others",
                label: "Others",
                children: [
                  {
                    value: "dialog",
                    label: "Dialog 对话框",
                  },
                  {
                    value: "tooltip",
                    label: "Tooltip 文字提示",
                  },
                  {
                    value: "popover",
                    label: "Popover 弹出框",
                  },
                  {
                    value: "card",
                    label: "Card 卡片",
                  },
                  {
                    value: "carousel",
                    label: "Carousel 走马灯",
                  },
                  {
                    value: "collapse",
                    label: "Collapse 折叠面板",
                  },
                ],
              },
            ],
          },
          {
            value: "ziyuan",
            label: "资源",
            children: [
              {
                value: "axure",
                label: "Axure Components",
              },
              {
                value: "sketch",
                label: "Sketch Templates",
              },
              {
                value: "jiaohu",
                label: "组件交互文档",
              },
            ],
          },
        ],
      }
    },
  }
</script>

仅显示最后一级

可以仅在输入框中显示选中项最后一级的标签,而不是选中项所在的完整路径。


属性show-all-levels定义了是否显示完整的路径,将其赋值为false则仅显示最后一级

<template>
  <el-cascader :options="options" :show-all-levels="false"></el-cascader>
</template>

<script>
  export default {
    data() {
      return {
        options: [
          {
            value: "zhinan",
            label: "指南",
            children: [
              {
                value: "shejiyuanze",
                label: "设计原则",
                children: [
                  {
                    value: "yizhi",
                    label: "一致",
                  },
                  {
                    value: "fankui",
                    label: "反馈",
                  },
                  {
                    value: "xiaolv",
                    label: "效率",
                  },
                  {
                    value: "kekong",
                    label: "可控",
                  },
                ],
              },
              {
                value: "daohang",
                label: "导航",
                children: [
                  {
                    value: "cexiangdaohang",
                    label: "侧向导航",
                  },
                  {
                    value: "dingbudaohang",
                    label: "顶部导航",
                  },
                ],
              },
            ],
          },
          {
            value: "zujian",
            label: "组件",
            children: [
              {
                value: "basic",
                label: "Basic",
                children: [
                  {
                    value: "layout",
                    label: "Layout 布局",
                  },
                  {
                    value: "color",
                    label: "Color 色彩",
                  },
                  {
                    value: "typography",
                    label: "Typography 字体",
                  },
                  {
                    value: "icon",
                    label: "Icon 图标",
                  },
                  {
                    value: "button",
                    label: "Button 按钮",
                  },
                ],
              },
              {
                value: "form",
                label: "Form",
                children: [
                  {
                    value: "radio",
                    label: "Radio 单选框",
                  },
                  {
                    value: "checkbox",
                    label: "Checkbox 多选框",
                  },
                  {
                    value: "input",
                    label: "Input 输入框",
                  },
                  {
                    value: "input-number",
                    label: "InputNumber 计数器",
                  },
                  {
                    value: "select",
                    label: "Select 选择器",
                  },
                  {
                    value: "cascader",
                    label: "Cascader 级联选择器",
                  },
                  {
                    value: "switch",
                    label: "Switch 开关",
                  },
                  {
                    value: "slider",
                    label: "Slider 滑块",
                  },
                  {
                    value: "time-picker",
                    label: "TimePicker 时间选择器",
                  },
                  {
                    value: "date-picker",
                    label: "DatePicker 日期选择器",
                  },
                  {
                    value: "datetime-picker",
                    label: "DateTimePicker 日期时间选择器",
                  },
                  {
                    value: "upload",
                    label: "Upload 上传",
                  },
                  {
                    value: "rate",
                    label: "Rate 评分",
                  },
                  {
                    value: "form",
                    label: "Form 表单",
                  },
                ],
              },
              {
                value: "data",
                label: "Data",
                children: [
                  {
                    value: "table",
                    label: "Table 表格",
                  },
                  {
                    value: "tag",
                    label: "Tag 标签",
                  },
                  {
                    value: "progress",
                    label: "Progress 进度条",
                  },
                  {
                    value: "tree",
                    label: "Tree 树形控件",
                  },
                  {
                    value: "pagination",
                    label: "Pagination 分页",
                  },
                  {
                    value: "badge",
                    label: "Badge 标记",
                  },
                ],
              },
              {
                value: "notice",
                label: "Notice",
                children: [
                  {
                    value: "alert",
                    label: "Alert 警告",
                  },
                  {
                    value: "loading",
                    label: "Loading 加载",
                  },
                  {
                    value: "message",
                    label: "Message 消息提示",
                  },
                  {
                    value: "message-box",
                    label: "MessageBox 弹框",
                  },
                  {
                    value: "notification",
                    label: "Notification 通知",
                  },
                ],
              },
              {
                value: "navigation",
                label: "Navigation",
                children: [
                  {
                    value: "menu",
                    label: "NavMenu 导航菜单",
                  },
                  {
                    value: "tabs",
                    label: "Tabs 标签页",
                  },
                  {
                    value: "breadcrumb",
                    label: "Breadcrumb 面包屑",
                  },
                  {
                    value: "dropdown",
                    label: "Dropdown 下拉菜单",
                  },
                  {
                    value: "steps",
                    label: "Steps 步骤条",
                  },
                ],
              },
              {
                value: "others",
                label: "Others",
                children: [
                  {
                    value: "dialog",
                    label: "Dialog 对话框",
                  },
                  {
                    value: "tooltip",
                    label: "Tooltip 文字提示",
                  },
                  {
                    value: "popover",
                    label: "Popover 弹出框",
                  },
                  {
                    value: "card",
                    label: "Card 卡片",
                  },
                  {
                    value: "carousel",
                    label: "Carousel 走马灯",
                  },
                  {
                    value: "collapse",
                    label: "Collapse 折叠面板",
                  },
                ],
              },
            ],
          },
          {
            value: "ziyuan",
            label: "资源",
            children: [
              {
                value: "axure",
                label: "Axure Components",
              },
              {
                value: "sketch",
                label: "Sketch Templates",
              },
              {
                value: "jiaohu",
                label: "组件交互文档",
              },
            ],
          },
        ],
      }
    },
  }
</script>

多选

可通过 props.multiple = true 来开启多选模式


在开启多选模式后,默认情况下会展示所有已选中的选项的 Tag,你可以使用collapse-tags来折叠 Tag

<template>
  <div class="block">
  <span class="demonstration">默认显示所有Tag</span>
  <el-cascader :options="options" :props="props" clearable></el-cascader>
</div>
<div class="block">
  <span class="demonstration">折叠展示Tag</span>
  <el-cascader
    :options="options"
    :props="props"
    collapse-tags
    clearable
  ></el-cascader>
</div>
</template>

<script>
  export default {
    data() {
      return {
        props: { multiple: true },
        options: [
          {
            value: 1,
            label: "东南",
            children: [
              {
                value: 2,
                label: "上海",
                children: [
                  { value: 3, label: "普陀" },
                  { value: 4, label: "黄埔" },
                  { value: 5, label: "徐汇" },
                ],
              },
              {
                value: 7,
                label: "江苏",
                children: [
                  { value: 8, label: "南京" },
                  { value: 9, label: "苏州" },
                  { value: 10, label: "无锡" },
                ],
              },
              {
                value: 12,
                label: "浙江",
                children: [
                  { value: 13, label: "杭州" },
                  { value: 14, label: "宁波" },
                  { value: 15, label: "嘉兴" },
                ],
              },
            ],
          },
          {
            value: 17,
            label: "西北",
            children: [
              {
                value: 18,
                label: "陕西",
                children: [
                  { value: 19, label: "西安" },
                  { value: 20, label: "延安" },
                ],
              },
              {
                value: 21,
                label: "新疆维吾尔族自治区",
                children: [
                  { value: 22, label: "乌鲁木齐" },
                  { value: 23, label: "克拉玛依" },
                ],
              },
            ],
          },
        ],
      }
    },
  }
</script>

选择任意一级选项

在单选模式下,你只能选择叶子节点;而在多选模式下,勾选父节点真正选中的都是叶子节点。启用该功能后,可让父子节点取消关联,选择任意一级选项。


可通过 props.checkStrictly = true 来设置父子节点取消选中关联,从而达到选择任意一级选项的目的。

<template>
  <div class="block">
  <span class="demonstration">单选选择任意一级选项</span>
  <el-cascader
    :options="options"
    :props="{ checkStrictly: true }"
    clearable
  ></el-cascader>
</div>
<div class="block">
  <span class="demonstration">多选选择任意一级选项</span>
  <el-cascader
    :options="options"
    :props="{ multiple: true, checkStrictly: true }"
    clearable
  ></el-cascader>
</div>
</template>

<script>
  export default {
    data() {
      return {
        options: [
          {
            value: "zhinan",
            label: "指南",
            children: [
              {
                value: "shejiyuanze",
                label: "设计原则",
                children: [
                  {
                    value: "yizhi",
                    label: "一致",
                  },
                  {
                    value: "fankui",
                    label: "反馈",
                  },
                  {
                    value: "xiaolv",
                    label: "效率",
                  },
                  {
                    value: "kekong",
                    label: "可控",
                  },
                ],
              },
              {
                value: "daohang",
                label: "导航",
                children: [
                  {
                    value: "cexiangdaohang",
                    label: "侧向导航",
                  },
                  {
                    value: "dingbudaohang",
                    label: "顶部导航",
                  },
                ],
              },
            ],
          },
          {
            value: "zujian",
            label: "组件",
            children: [
              {
                value: "basic",
                label: "Basic",
                children: [
                  {
                    value: "layout",
                    label: "Layout 布局",
                  },
                  {
                    value: "color",
                    label: "Color 色彩",
                  },
                  {
                    value: "typography",
                    label: "Typography 字体",
                  },
                  {
                    value: "icon",
                    label: "Icon 图标",
                  },
                  {
                    value: "button",
                    label: "Button 按钮",
                  },
                ],
              },
              {
                value: "form",
                label: "Form",
                children: [
                  {
                    value: "radio",
                    label: "Radio 单选框",
                  },
                  {
                    value: "checkbox",
                    label: "Checkbox 多选框",
                  },
                  {
                    value: "input",
                    label: "Input 输入框",
                  },
                  {
                    value: "input-number",
                    label: "InputNumber 计数器",
                  },
                  {
                    value: "select",
                    label: "Select 选择器",
                  },
                  {
                    value: "cascader",
                    label: "Cascader 级联选择器",
                  },
                  {
                    value: "switch",
                    label: "Switch 开关",
                  },
                  {
                    value: "slider",
                    label: "Slider 滑块",
                  },
                  {
                    value: "time-picker",
                    label: "TimePicker 时间选择器",
                  },
                  {
                    value: "date-picker",
                    label: "DatePicker 日期选择器",
                  },
                  {
                    value: "datetime-picker",
                    label: "DateTimePicker 日期时间选择器",
                  },
                  {
                    value: "upload",
                    label: "Upload 上传",
                  },
                  {
                    value: "rate",
                    label: "Rate 评分",
                  },
                  {
                    value: "form",
                    label: "Form 表单",
                  },
                ],
              },
              {
                value: "data",
                label: "Data",
                children: [
                  {
                    value: "table",
                    label: "Table 表格",
                  },
                  {
                    value: "tag",
                    label: "Tag 标签",
                  },
                  {
                    value: "progress",
                    label: "Progress 进度条",
                  },
                  {
                    value: "tree",
                    label: "Tree 树形控件",
                  },
                  {
                    value: "pagination",
                    label: "Pagination 分页",
                  },
                  {
                    value: "badge",
                    label: "Badge 标记",
                  },
                ],
              },
              {
                value: "notice",
                label: "Notice",
                children: [
                  {
                    value: "alert",
                    label: "Alert 警告",
                  },
                  {
                    value: "loading",
                    label: "Loading 加载",
                  },
                  {
                    value: "message",
                    label: "Message 消息提示",
                  },
                  {
                    value: "message-box",
                    label: "MessageBox 弹框",
                  },
                  {
                    value: "notification",
                    label: "Notification 通知",
                  },
                ],
              },
              {
                value: "navigation",
                label: "Navigation",
                children: [
                  {
                    value: "menu",
                    label: "NavMenu 导航菜单",
                  },
                  {
                    value: "tabs",
                    label: "Tabs 标签页",
                  },
                  {
                    value: "breadcrumb",
                    label: "Breadcrumb 面包屑",
                  },
                  {
                    value: "dropdown",
                    label: "Dropdown 下拉菜单",
                  },
                  {
                    value: "steps",
                    label: "Steps 步骤条",
                  },
                ],
              },
              {
                value: "others",
                label: "Others",
                children: [
                  {
                    value: "dialog",
                    label: "Dialog 对话框",
                  },
                  {
                    value: "tooltip",
                    label: "Tooltip 文字提示",
                  },
                  {
                    value: "popover",
                    label: "Popover 弹出框",
                  },
                  {
                    value: "card",
                    label: "Card 卡片",
                  },
                  {
                    value: "carousel",
                    label: "Carousel 走马灯",
                  },
                  {
                    value: "collapse",
                    label: "Collapse 折叠面板",
                  },
                ],
              },
            ],
          },
          {
            value: "ziyuan",
            label: "资源",
            children: [
              {
                value: "axure",
                label: "Axure Components",
              },
              {
                value: "sketch",
                label: "Sketch Templates",
              },
              {
                value: "jiaohu",
                label: "组件交互文档",
              },
            ],
          },
        ],
      }
    },
  }
</script>

动态加载

当选中某一级时,动态加载该级下的选项。


通过lazy开启动态加载,并通过lazyload来设置加载数据源的方法。lazyload方法有两个参数,第一个参数node为当前点击的节点,第二个resolve为数据加载完成的回调(必须调用)。为了更准确的显示节点的状态,还可以对节点数据添加是否为叶子节点的标志位 (默认字段为leaf,可通过props.leaf修改),否则会简单的以有无子节点来判断是否为叶子节点。

<template>
  <el-cascader :props="props"></el-cascader>
</template>

<script>
  let id = 0

  export default {
    data() {
      return {
        props: {
          lazy: true,
          lazyLoad(node, resolve) {
            const { level } = node
            setTimeout(() => {
              const nodes = Array.from({ length: level + 1 }).map((item) => ({
                value: ++id,
                label: `选项${id}`,
                leaf: level >= 2,
              }))
              // 通过调用resolve将子节点数据返回,通知组件数据加载完成
              resolve(nodes)
            }, 1000)
          },
        },
      }
    },
  }
</script>

可搜索

可以快捷地搜索选项并选择。


将filterable赋值为true即可打开搜索功能,默认会匹配节点的label或所有父节点的label(由show-all-levels决定)中包含输入值的选项。你也可以用filter-method自定义搜索逻辑,接受一个函数,第一个参数是节点node,第二个参数是搜索关键词keyword,通过返回布尔值表示是否命中。

<template>
  <div class="block">
  <span class="demonstration">单选可搜索</span>
  <el-cascader
    placeholder="试试搜索:指南"
    :options="options"
    filterable
  ></el-cascader>
</div>
<div class="block">
  <span class="demonstration">多选可搜索</span>
  <el-cascader
    placeholder="试试搜索:指南"
    :options="options"
    :props="{ multiple: true }"
    filterable
  ></el-cascader>
</div>
</template>

<script>
  export default {
    data() {
      return {
        options: [
          {
            value: "zhinan",
            label: "指南",
            children: [
              {
                value: "shejiyuanze",
                label: "设计原则",
                children: [
                  {
                    value: "yizhi",
                    label: "一致",
                  },
                  {
                    value: "fankui",
                    label: "反馈",
                  },
                  {
                    value: "xiaolv",
                    label: "效率",
                  },
                  {
                    value: "kekong",
                    label: "可控",
                  },
                ],
              },
              {
                value: "daohang",
                label: "导航",
                children: [
                  {
                    value: "cexiangdaohang",
                    label: "侧向导航",
                  },
                  {
                    value: "dingbudaohang",
                    label: "顶部导航",
                  },
                ],
              },
            ],
          },
          {
            value: "zujian",
            label: "组件",
            children: [
              {
                value: "basic",
                label: "Basic",
                children: [
                  {
                    value: "layout",
                    label: "Layout 布局",
                  },
                  {
                    value: "color",
                    label: "Color 色彩",
                  },
                  {
                    value: "typography",
                    label: "Typography 字体",
                  },
                  {
                    value: "icon",
                    label: "Icon 图标",
                  },
                  {
                    value: "button",
                    label: "Button 按钮",
                  },
                ],
              },
              {
                value: "form",
                label: "Form",
                children: [
                  {
                    value: "radio",
                    label: "Radio 单选框",
                  },
                  {
                    value: "checkbox",
                    label: "Checkbox 多选框",
                  },
                  {
                    value: "input",
                    label: "Input 输入框",
                  },
                  {
                    value: "input-number",
                    label: "InputNumber 计数器",
                  },
                  {
                    value: "select",
                    label: "Select 选择器",
                  },
                  {
                    value: "cascader",
                    label: "Cascader 级联选择器",
                  },
                  {
                    value: "switch",
                    label: "Switch 开关",
                  },
                  {
                    value: "slider",
                    label: "Slider 滑块",
                  },
                  {
                    value: "time-picker",
                    label: "TimePicker 时间选择器",
                  },
                  {
                    value: "date-picker",
                    label: "DatePicker 日期选择器",
                  },
                  {
                    value: "datetime-picker",
                    label: "DateTimePicker 日期时间选择器",
                  },
                  {
                    value: "upload",
                    label: "Upload 上传",
                  },
                  {
                    value: "rate",
                    label: "Rate 评分",
                  },
                  {
                    value: "form",
                    label: "Form 表单",
                  },
                ],
              },
              {
                value: "data",
                label: "Data",
                children: [
                  {
                    value: "table",
                    label: "Table 表格",
                  },
                  {
                    value: "tag",
                    label: "Tag 标签",
                  },
                  {
                    value: "progress",
                    label: "Progress 进度条",
                  },
                  {
                    value: "tree",
                    label: "Tree 树形控件",
                  },
                  {
                    value: "pagination",
                    label: "Pagination 分页",
                  },
                  {
                    value: "badge",
                    label: "Badge 标记",
                  },
                ],
              },
              {
                value: "notice",
                label: "Notice",
                children: [
                  {
                    value: "alert",
                    label: "Alert 警告",
                  },
                  {
                    value: "loading",
                    label: "Loading 加载",
                  },
                  {
                    value: "message",
                    label: "Message 消息提示",
                  },
                  {
                    value: "message-box",
                    label: "MessageBox 弹框",
                  },
                  {
                    value: "notification",
                    label: "Notification 通知",
                  },
                ],
              },
              {
                value: "navigation",
                label: "Navigation",
                children: [
                  {
                    value: "menu",
                    label: "NavMenu 导航菜单",
                  },
                  {
                    value: "tabs",
                    label: "Tabs 标签页",
                  },
                  {
                    value: "breadcrumb",
                    label: "Breadcrumb 面包屑",
                  },
                  {
                    value: "dropdown",
                    label: "Dropdown 下拉菜单",
                  },
                  {
                    value: "steps",
                    label: "Steps 步骤条",
                  },
                ],
              },
              {
                value: "others",
                label: "Others",
                children: [
                  {
                    value: "dialog",
                    label: "Dialog 对话框",
                  },
                  {
                    value: "tooltip",
                    label: "Tooltip 文字提示",
                  },
                  {
                    value: "popover",
                    label: "Popover 弹出框",
                  },
                  {
                    value: "card",
                    label: "Card 卡片",
                  },
                  {
                    value: "carousel",
                    label: "Carousel 走马灯",
                  },
                  {
                    value: "collapse",
                    label: "Collapse 折叠面板",
                  },
                ],
              },
            ],
          },
          {
            value: "ziyuan",
            label: "资源",
            children: [
              {
                value: "axure",
                label: "Axure Components",
              },
              {
                value: "sketch",
                label: "Sketch Templates",
              },
              {
                value: "jiaohu",
                label: "组件交互文档",
              },
            ],
          },
        ],
      }
    },
  }
</script>

自定义节点内容

可以自定义备选项的节点内容


可以通过scoped slot对级联选择器的备选项的节点内容进行自定义,scoped slot 会传入两个字段 node 和 data,分别表示当前节点的 Node 对象和数据。

<template>
  <el-cascader :options="options">
  <template #default="{ node, data }">
    <span>{{ data.label }}</span>
    <span v-if="!node.isLeaf"> ({{ data.children.length }}) </span>
  </template>
</el-cascader>
</template>

<script>
  export default {
    data() {
      return {
        options: [
          {
            value: "zhinan",
            label: "指南",
            children: [
              {
                value: "shejiyuanze",
                label: "设计原则",
                children: [
                  {
                    value: "yizhi",
                    label: "一致",
                  },
                  {
                    value: "fankui",
                    label: "反馈",
                  },
                  {
                    value: "xiaolv",
                    label: "效率",
                  },
                  {
                    value: "kekong",
                    label: "可控",
                  },
                ],
              },
              {
                value: "daohang",
                label: "导航",
                children: [
                  {
                    value: "cexiangdaohang",
                    label: "侧向导航",
                  },
                  {
                    value: "dingbudaohang",
                    label: "顶部导航",
                  },
                ],
              },
            ],
          },
          {
            value: "zujian",
            label: "组件",
            children: [
              {
                value: "basic",
                label: "Basic",
                children: [
                  {
                    value: "layout",
                    label: "Layout 布局",
                  },
                  {
                    value: "color",
                    label: "Color 色彩",
                  },
                  {
                    value: "typography",
                    label: "Typography 字体",
                  },
                  {
                    value: "icon",
                    label: "Icon 图标",
                  },
                  {
                    value: "button",
                    label: "Button 按钮",
                  },
                ],
              },
              {
                value: "form",
                label: "Form",
                children: [
                  {
                    value: "radio",
                    label: "Radio 单选框",
                  },
                  {
                    value: "checkbox",
                    label: "Checkbox 多选框",
                  },
                  {
                    value: "input",
                    label: "Input 输入框",
                  },
                  {
                    value: "input-number",
                    label: "InputNumber 计数器",
                  },
                  {
                    value: "select",
                    label: "Select 选择器",
                  },
                  {
                    value: "cascader",
                    label: "Cascader 级联选择器",
                  },
                  {
                    value: "switch",
                    label: "Switch 开关",
                  },
                  {
                    value: "slider",
                    label: "Slider 滑块",
                  },
                  {
                    value: "time-picker",
                    label: "TimePicker 时间选择器",
                  },
                  {
                    value: "date-picker",
                    label: "DatePicker 日期选择器",
                  },
                  {
                    value: "datetime-picker",
                    label: "DateTimePicker 日期时间选择器",
                  },
                  {
                    value: "upload",
                    label: "Upload 上传",
                  },
                  {
                    value: "rate",
                    label: "Rate 评分",
                  },
                  {
                    value: "form",
                    label: "Form 表单",
                  },
                ],
              },
              {
                value: "data",
                label: "Data",
                children: [
                  {
                    value: "table",
                    label: "Table 表格",
                  },
                  {
                    value: "tag",
                    label: "Tag 标签",
                  },
                  {
                    value: "progress",
                    label: "Progress 进度条",
                  },
                  {
                    value: "tree",
                    label: "Tree 树形控件",
                  },
                  {
                    value: "pagination",
                    label: "Pagination 分页",
                  },
                  {
                    value: "badge",
                    label: "Badge 标记",
                  },
                ],
              },
              {
                value: "notice",
                label: "Notice",
                children: [
                  {
                    value: "alert",
                    label: "Alert 警告",
                  },
                  {
                    value: "loading",
                    label: "Loading 加载",
                  },
                  {
                    value: "message",
                    label: "Message 消息提示",
                  },
                  {
                    value: "message-box",
                    label: "MessageBox 弹框",
                  },
                  {
                    value: "notification",
                    label: "Notification 通知",
                  },
                ],
              },
              {
                value: "navigation",
                label: "Navigation",
                children: [
                  {
                    value: "menu",
                    label: "NavMenu 导航菜单",
                  },
                  {
                    value: "tabs",
                    label: "Tabs 标签页",
                  },
                  {
                    value: "breadcrumb",
                    label: "Breadcrumb 面包屑",
                  },
                  {
                    value: "dropdown",
                    label: "Dropdown 下拉菜单",
                  },
                  {
                    value: "steps",
                    label: "Steps 步骤条",
                  },
                ],
              },
              {
                value: "others",
                label: "Others",
                children: [
                  {
                    value: "dialog",
                    label: "Dialog 对话框",
                  },
                  {
                    value: "tooltip",
                    label: "Tooltip 文字提示",
                  },
                  {
                    value: "popover",
                    label: "Popover 弹出框",
                  },
                  {
                    value: "card",
                    label: "Card 卡片",
                  },
                  {
                    value: "carousel",
                    label: "Carousel 走马灯",
                  },
                  {
                    value: "collapse",
                    label: "Collapse 折叠面板",
                  },
                ],
              },
            ],
          },
          {
            value: "ziyuan",
            label: "资源",
            children: [
              {
                value: "axure",
                label: "Axure Components",
              },
              {
                value: "sketch",
                label: "Sketch Templates",
              },
              {
                value: "jiaohu",
                label: "组件交互文档",
              },
            ],
          },
        ],
      }
    },
  }
</script>

级联面板

级联面板是级联选择器的核心组件,与级联选择器一样,有单选、多选、动态加载等多种功能。


和级联选择器一样,通过options来指定选项,也可通过props来设置多选、动态加载等功能,具体详情见下方 API 表格。

<template>
  <el-cascader-panel :options="options"></el-cascader-panel>
</template>

<script>
  export default {
    data() {
      return {
        options: [
          {
            value: "zhinan",
            label: "指南",
            children: [
              {
                value: "shejiyuanze",
                label: "设计原则",
                children: [
                  {
                    value: "yizhi",
                    label: "一致",
                  },
                  {
                    value: "fankui",
                    label: "反馈",
                  },
                  {
                    value: "xiaolv",
                    label: "效率",
                  },
                  {
                    value: "kekong",
                    label: "可控",
                  },
                ],
              },
              {
                value: "daohang",
                label: "导航",
                children: [
                  {
                    value: "cexiangdaohang",
                    label: "侧向导航",
                  },
                  {
                    value: "dingbudaohang",
                    label: "顶部导航",
                  },
                ],
              },
            ],
          },
          {
            value: "zujian",
            label: "组件",
            children: [
              {
                value: "basic",
                label: "Basic",
                children: [
                  {
                    value: "layout",
                    label: "Layout 布局",
                  },
                  {
                    value: "color",
                    label: "Color 色彩",
                  },
                  {
                    value: "typography",
                    label: "Typography 字体",
                  },
                  {
                    value: "icon",
                    label: "Icon 图标",
                  },
                  {
                    value: "button",
                    label: "Button 按钮",
                  },
                ],
              },
              {
                value: "form",
                label: "Form",
                children: [
                  {
                    value: "radio",
                    label: "Radio 单选框",
                  },
                  {
                    value: "checkbox",
                    label: "Checkbox 多选框",
                  },
                  {
                    value: "input",
                    label: "Input 输入框",
                  },
                  {
                    value: "input-number",
                    label: "InputNumber 计数器",
                  },
                  {
                    value: "select",
                    label: "Select 选择器",
                  },
                  {
                    value: "cascader",
                    label: "Cascader 级联选择器",
                  },
                  {
                    value: "switch",
                    label: "Switch 开关",
                  },
                  {
                    value: "slider",
                    label: "Slider 滑块",
                  },
                  {
                    value: "time-picker",
                    label: "TimePicker 时间选择器",
                  },
                  {
                    value: "date-picker",
                    label: "DatePicker 日期选择器",
                  },
                  {
                    value: "datetime-picker",
                    label: "DateTimePicker 日期时间选择器",
                  },
                  {
                    value: "upload",
                    label: "Upload 上传",
                  },
                  {
                    value: "rate",
                    label: "Rate 评分",
                  },
                  {
                    value: "form",
                    label: "Form 表单",
                  },
                ],
              },
              {
                value: "data",
                label: "Data",
                children: [
                  {
                    value: "table",
                    label: "Table 表格",
                  },
                  {
                    value: "tag",
                    label: "Tag 标签",
                  },
                  {
                    value: "progress",
                    label: "Progress 进度条",
                  },
                  {
                    value: "tree",
                    label: "Tree 树形控件",
                  },
                  {
                    value: "pagination",
                    label: "Pagination 分页",
                  },
                  {
                    value: "badge",
                    label: "Badge 标记",
                  },
                ],
              },
              {
                value: "notice",
                label: "Notice",
                children: [
                  {
                    value: "alert",
                    label: "Alert 警告",
                  },
                  {
                    value: "loading",
                    label: "Loading 加载",
                  },
                  {
                    value: "message",
                    label: "Message 消息提示",
                  },
                  {
                    value: "message-box",
                    label: "MessageBox 弹框",
                  },
                  {
                    value: "notification",
                    label: "Notification 通知",
                  },
                ],
              },
              {
                value: "navigation",
                label: "Navigation",
                children: [
                  {
                    value: "menu",
                    label: "NavMenu 导航菜单",
                  },
                  {
                    value: "tabs",
                    label: "Tabs 标签页",
                  },
                  {
                    value: "breadcrumb",
                    label: "Breadcrumb 面包屑",
                  },
                  {
                    value: "dropdown",
                    label: "Dropdown 下拉菜单",
                  },
                  {
                    value: "steps",
                    label: "Steps 步骤条",
                  },
                ],
              },
              {
                value: "others",
                label: "Others",
                children: [
                  {
                    value: "dialog",
                    label: "Dialog 对话框",
                  },
                  {
                    value: "tooltip",
                    label: "Tooltip 文字提示",
                  },
                  {
                    value: "popover",
                    label: "Popover 弹出框",
                  },
                  {
                    value: "card",
                    label: "Card 卡片",
                  },
                  {
                    value: "carousel",
                    label: "Carousel 走马灯",
                  },
                  {
                    value: "collapse",
                    label: "Collapse 折叠面板",
                  },
                ],
              },
            ],
          },
          {
            value: "ziyuan",
            label: "资源",
            children: [
              {
                value: "axure",
                label: "Axure Components",
              },
              {
                value: "sketch",
                label: "Sketch Templates",
              },
              {
                value: "jiaohu",
                label: "组件交互文档",
              },
            ],
          },
        ],
      }
    },
  }
</script>

Cascader Attributes

参数说明类型可选值默认值
model-value / v-model选中项绑定值-
options可选项数据源,键名可通过 Props 属性配置array
props配置选项,具体见下表object
size尺寸stringmedium / small / mini
placeholder输入框占位文本string请选择
disabled是否禁用booleanfalse
clearable是否支持清空选项booleanfalse
show-all-levels输入框中是否显示选中值的完整路径booleantrue
collapse-tags多选模式下是否折叠 Tagboolean-false
separator选项分隔符string斜杠" / "
filterable是否可搜索选项boolean
filter-method自定义搜索逻辑,第一个参数是节点node,第二个参数是搜索关键词keyword,通过返回布尔值表示是否命中function(node, keyword)--
debounce搜索关键词输入的去抖延迟,毫秒number300
before-filter筛选之前的钩子,参数为输入的值,若返回 false 或者返回 Promise 且被 reject,则停止筛选function(value)
popper-class自定义浮层类名string
popper-append-to-body是否将弹出框插入至 body 元素。在弹出框的定位出现问题时,可将该属性设置为 falseboolean-true

Cascader Events

事件名称说明回调参数
change当选中节点变化时触发选中节点的值
expand-change当展开节点发生变化时触发各父级选项值组成的数组
blur当失去焦点时触发(event: Event)
focus当获得焦点时触发(event: Event)
visible-change下拉框出现/隐藏时触发出现则为 true,隐藏则为 false
remove-tag在多选模式下,移除 Tag 时触发移除的 Tag 对应的节点的值

Cascader Methods

方法名说明参数
getCheckedNodes获取选中的节点(leafOnly) 是否只是叶子节点,默认值为 false

Cascader Slots

名称说明
-自定义备选项的节点内容,参数为 { node, data },分别为当前节点的 Node 对象和数据
empty无匹配选项时的内容

CascaderPanel Attributes

参数说明类型可选值默认值
model-value / v-model选中项绑定值-
options可选项数据源,键名可通过 Props 属性配置array
props配置选项,具体见下表object

 CascaderPanel Events

事件名称说明回调参数
change当选中节点变化时触发选中节点的值
expand-change当展开节点发生变化时触发各父级选项值组成的数组

CascaderPanel Methods

方法名说明参数
getCheckedNodes获取选中的节点数组(leafOnly) 是否只是叶子节点,默认值为 false
clearCheckedNodes清空选中的节点-

CascaderPanel Slots

名称说明
-自定义备选项的节点内容,参数为 { node, data },分别为当前节点的 Node 对象和数据

 Props

参数说明类型可选值默认值
expandTrigger次级菜单的展开方式stringclick / hover"click"
multiple是否多选boolean-false
checkStrictly是否严格的遵守父子节点不互相关联boolean-false
emitPath在选中节点改变时,是否返回由该节点所在的各级菜单的值所组成的数组,若设置 false,则只返回该节点的值boolean-true
lazy是否动态加载子节点,需与 lazyLoad 方法结合使用boolean-false
lazyLoad加载动态数据的方法,仅在 lazy 为 true 时有效function(node, resolve),node为当前点击的节点,resolve为数据加载完成的回调(必须调用)--
value指定选项的值为选项对象的某个属性值string"value"
label指定选项标签为选项对象的某个属性值string"label"
children指定选项的子选项为选项对象的某个属性值string"children"
disabled指定选项的禁用为选项对象的某个属性值string"disabled"
leaf指定选项的叶子节点的标志位为选项对象的某个属性值string"leaf"


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