el-cascader tag

el-cascader tag 是基于 Element UI 的级联选择器组件。它可以将多个下拉框联动起来，方便用户选择相关的数据。el-cascader tag 适用于多层级的数据展示和选择，例如省市区三级联动选择器。

在使用 el-cascader tag 组件时，需要提供一个数据源（options），它是一个数组，每个元素代表一个选项。每个选项包含三个属性：label（显示的文本）、value（实际的值）和children（下一级选项）。通过嵌套数组的方式，可以实现多层级选择。

当用户选择某个选项时，el-cascader tag 会触发 change 事件，将当前选中的值以数组的形式传递给回调函数。开发者可以通过监听 change 事件，获取用户选择的数据并进行相应处理。

相关问题

el-cascader-panel

el-cascader-panel是一个基于Element UI的级联选择器组件，它可以让用户通过多个层级的面板来选择数据。在引用中提到，el-cascader-panel增加了全选按钮，并覆写了级联面板宽度。在引用中提到，可以通过initSelectedCodes方法来初始化勾选的资源。以下是一个el-cascader-panel的例子：

<template>
  <el-cascader-panel
    :options="options"
    :props="props"
    v-model="selectedValues"
    @change="handleChange"
    :show-all-levels="false"
    :check-strictly="true"
    :expand-trigger="expandTrigger"
    :clearable="clearable"
    :disabled="disabled"
    :filterable="filterable"
    :loading="loading"
    :placeholder="placeholder"
    :popper-class="popperClass"
    :render-format="renderFormat"
    :separator="separator"
    :size="size"
    :trigger="trigger"
    :value-format="valueFormat"
    :width="width"
  />
</template>

<script>
export default {
  data() {
    return {
      selectedValues: [],
      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'
                }
              ]
            }
          ]
        }
      ],
      props: {
        value: 'value',
        label: 'label',
        children: 'children'
      },
      expandTrigger: 'hover',
      clearable: true,
      disabled: false,
      filterable: false,
      loading: false,
      placeholder: '请选择',
      popperClass: '',
      renderFormat: labels => labels.join(' / '),
      separator: ' / ',
      size: '',
      trigger: 'click',
      valueFormat: 'value',
      width: ''
    }
  },
  methods: {
    handleChange(value) {
      console.log(value)
    }
  }
}
</script>

el-cascader添加全选功能

为el-cascader添加全选功能的步骤如下：

1.在el-cascader的数据源中添加“全选”选项，例如：

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: 'ziyuan',
  label: '资源',
  children: [{
    value: 'axure',
    label: 'Axure Components'
  }, {
    value: 'sketch',
    label: 'Sketch Templates'
  }, {
    value: 'jiaohu',
    label: '组件交互文档'
  }]
}, {
  value: 'ziyuan1',
  label: '资源1',
  children: [{
    value: 'axure1',
    label: 'Axure Components1'
  }, {
    value: 'sketch1',
    label: 'Sketch Templates1'
  }, {
    value: 'jiaohu1',
    label: '组件交互文档1'
  }]
}, {
  value: 'ziyuan2',
  label: '资源2',
  children: [{
    value: 'axure2',
    label: 'Axure Components2'
  }, {
    value: 'sketch2',
    label: 'Sketch Templates2'
  }, {
    value: 'jiaohu2',
    label: '组件交互文档2'
  }]
}, {
  value: 'ziyuan3',
  label: '资源3',
  children: [{
    value: 'axure3',
    label: 'Axure Components3'
  }, {
    value: 'sketch3',
    label: 'Sketch Templates3'
  }, {
    value: 'jiaohu3',
    label: '组件交互文档3'
  }]
}, {
  value: 'ziyuan4',
  label: '资源4',
  children: [{
    value: 'axure4',
    label: 'Axure Components4'
  }, {
    value: 'sketch4',
    label: 'Sketch Templates4'
  }, {
    value: 'jiaohu4',
    label: '组件交互文档4'
  }]
}, {
  value: 'ziyuan5',
  label: '资源5',
  children: [{
    value: 'axure5',
    label: 'Axure Components5'
  }, {
    value: 'sketch5',
    label: 'Sketch Templates5'
  }, {
    value: 'jiaohu5',
    label: '组件交互文档5'
  }]
}]

2.在el-cascader的模板中添加全选按钮，例如：

<template>
  <el-cascader
    :options="options"
    :props="props"
    v-model="selectedOptions"
    @change="handleChange"
    @expand-change="handleExpandChange"
    @visible-change="handleVisibleChange"
    @remove-tag="handleRemoveTag"
    @clear="handleClear"
    :show-all-levels="false"
    :check-strictly="true"
    :expand-trigger="expandTrigger"
    :filterable="filterable"
    :placeholder="placeholder"
    :disabled="disabled"
    :size="size"
    :popper-class="popperClass"
    :before-filter="beforeFilter"
    :debounce="debounce"
    :change-on-select="changeOnSelect"
    :popper-append-to-body="popperAppendToBody"
    :hover-threshold="hoverThreshold"
    :load-data="loadData"
    :loading-text="loadingText"
    :no-match-text="noMatchText"
    :no-data-text="noDataText"
    :popper-options="popperOptions"
    :emit-path="emitPath"
    :value-consists-of="valueConsistsOf"
    :collapse-tags="collapseTags"
    :show-always="showAlways"
    :clearable="clearable"
    :expand-trigger-on-focus="expandTriggerOnFocus"
    :change-on-blur="changeOnBlur"
    :before-clear="beforeClear"
    :popper-append-to-body="popperAppendToBody"
    :popper-options="popperOptions"
    :filter-method="filterMethod"
    :reserve-keyword="reserveKeyword"
    :default-first-option="defaultFirstOption"
    :popper-class="popperClass"
    :popper-append-to-body="popperAppendToBody"
    :popper-options="popperOptions"
    :before-clear="beforeClear"
    :before-expand="beforeExpand"
    :before-select="beforeSelect"
    :clear-icon="clearIcon"
    :expand-icon="expandIcon"
    :loading-icon="loadingIcon"
    :multiple-limit="multipleLimit"
    :show-checkbox="showCheckbox"
    :check-strictly="checkStrictly"
    :emit-path="emitPath"
    :lazy="lazy"
    :lazy-load="lazyLoad"
    :lazy-method="lazyMethod"
    :model-value="modelValue"
    :filter-method="filterMethod"
    :debounce="debounce"
    :change-on-select="changeOnSelect"
    :expand-trigger-on-focus="expandTriggerOnFocus"
    :change-on-blur="changeOnBlur"
    :before-clear="beforeClear"
    :before-expand="beforeExpand"
    :before-select="beforeSelect"
    :clear-icon="clearIcon"
    :expand-icon="expandIcon"
    :loading-icon="loadingIcon"
    :multiple-limit="multipleLimit"
    :show-checkbox="showCheckbox"
    :check-strictly="checkStrictly"
    :emit-path="emitPath"
    :lazy="lazy"
    :lazy-load="lazyLoad"
    :lazy-method="lazyMethod"
    :model-value="modelValue"
    ref="cascader"
  >
    <template #suffix>
      <el-checkbox
        v-model="isAllSelected"
        @change="handleAllSelectedChange"
        :indeterminate="isIndeterminate"
      >
        全选
      </el-checkbox>
    </template>
  </el-cascader>
</template>

3.在el-cascader的脚本中添加全选相关的逻辑，例如：

<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