解决Sortable拖动el-table表头时，由于选择列造成的拖拽顺序错乱的bug

原因由于我的表头是由数组循环遍历生成的，而选择列不在数组内，只能在循环外定义el-table-column，造成拖动时索引错乱
错误代码

javascript 复制代码

  <el-table
    @header-dragend="headerDragend"
    id="out-table"
    :data="state.sliceTable"
    border
    stripe
    ref="TableRef"
    :row-key="getRowKeys(pageData)"
  >
  <el-table-column type="selection" width="55" fixed /> 
>
    <template v-for="(item, index) in state.pageDataTitle" :key="index"> 
      <el-table-column
        :prop="item.value"
        :label="item.name"
        :key="index"
      >
        <template #default="scope">
          <slot :name="item.value" :scope="scope">{{ scope.row[item.value] }}</slot>
        </template>
      </el-table-column>
    </template>
  </el-table>

解决办法向数组开头push一条 type="selection" 的对象并把el-table-column 写到循环体内

javascript 复制代码

  <template v-for="(item, index) in state.pageDataTitle" :key="index">
    <el-table-column type="selection" v-if="item.type" width="55" fixed />
    <el-table-column
      :prop="item.value"
      :label="item.name"
      :key="index"
    >
      <template #default="scope">
        <slot :name="item.value" :scope="scope">{{ scope.row[item.value] }}</slot>
      </template>
    </el-table-column>
  </template>

当拖动选择列或拖向选择列时仍然会造成拖动顺序混乱所以我们要禁止掉
给el-table-column添加 class-name="allowdrag" 表示除了选择列之外都可以拖动

javascript 复制代码

  <el-table-column
    class-name="allowdrag"
    :label="item.name"
    :key="index"
  >
    <template #default="scope">
      <slot :name="item.value" :scope="scope">{{ scope.row[item.value] }}</slot>
    </template>
  </el-table-column>

javascript 复制代码

//拖拽列
const columnDrop2 = (dom) => {
  if (!dom) return
  Sortable.create(dom.$el.querySelector('.el-table__header-wrapper>.el-table__header tr'), {
    handle: '.allowdrag',  //除了选择列都可以选择
    onEnd: (sortableEvent) => {
      const targetThElem = sortableEvent.item;
      const wrapperElem = targetThElem.parentNode;
      const newIndex = sortableEvent.newIndex;
      const oldIndex = sortableEvent.oldIndex;
      const oldTrElement = wrapperElem.children[oldIndex];
      const currRow = state.pageDataTitle?.splice(oldIndex, 1)[0];
      state.pageDataTitle?.splice(newIndex, 0, currRow);
      if (newIndex > oldIndex) {
        wrapperElem.insertBefore(targetThElem, oldTrElement)
      } else {
        wrapperElem.insertBefore(
          targetThElem,
          oldTrElement ? oldTrElement.nextElementSibling : oldTrElement
        )
      }

    },
  })
}

这样解决了选择列向其他列拖动，但没有解决其他列向选择列拖动
解决办法添加 :header-cell-class-name="tableRowClassName" 并添加onMove方法

javascript 复制代码

  <el-table
    :header-cell-class-name="tableRowClassName"
    id="out-table"
    :data="state.sliceTable"
    ref="TableRef"
  >
    <template v-for="(item, index) in state.pageDataTitle" :key="index">
      <el-table-column type="selection" v-if="item.type" width="55" fixed />
      <el-table-column
        class-name="allowdrag"
        :prop="item.value"
        :label="item.name"
        :key="index"
      >
        <template #default="scope">
          <slot :name="item.value" :scope="scope">{{ scope.row[item.value] }}</slot>
        </template>
      </el-table-column>
    </template>
  </el-table>

javascript 复制代码

//解决向选择列拖动的bug
 function tableRowClassName(row) {
      if (row.columnIndex == 0) {
        return "filtered";
      }
      return "";
    }

javascript 复制代码

//拖拽列
const columnDrop2 = (dom) => {
    if (!dom) return
    Sortable.create(dom.$el.querySelector('.el-table__header-wrapper>.el-table__header tr'), {
        handle: '.allowdrag',
        onEnd: (sortableEvent) => {
            const targetThElem = sortableEvent.item;
            const wrapperElem = targetThElem.parentNode;
            const newIndex = sortableEvent.newIndex;
            const oldIndex = sortableEvent.oldIndex;
            const oldTrElement = wrapperElem.children[oldIndex];
            const currRow = state.pageDataTitle?.splice(oldIndex, 1)[0];
           state.pageDataTitle?.splice(newIndex, 0, currRow)
            if (newIndex > oldIndex) {
                wrapperElem.insertBefore(targetThElem, oldTrElement)
            } else {
                wrapperElem.insertBefore(
                    targetThElem,
                    oldTrElement ? oldTrElement.nextElementSibling : oldTrElement
                )
            }

        },
        //解决向选择列拖动的bug
        onMove(e) {
        return e.related.className.indexOf("filtered") === -1;
      }
    })
}

完整代码

javascript 复制代码

  <el-table
    :header-cell-class-name="tableRowClassName"
    id="out-table"
    :data="state.sliceTable"
    ref="TableRef"
  >
    <template v-for="(item, index) in state.pageDataTitle" :key="index">
      <el-table-column type="selection" v-if="item.type" width="55" fixed />
      <el-table-column
        class-name="allowdrag"
        :prop="item.value"
        :label="item.name"
        :key="index"
      >
        <template #default="scope">
          <slot :name="item.value" :scope="scope">{{ scope.row[item.value] }}</slot>
        </template>
      </el-table-column>
    </template>
  </el-table>

javascript 复制代码

//拖拽列
const columnDrop2 = (dom) => {
    if (!dom) return
    Sortable.create(dom.$el.querySelector('.el-table__header-wrapper>.el-table__header tr'), {
        handle: '.allowdrag',
        onEnd: (sortableEvent) => {
            const targetThElem = sortableEvent.item;
            const wrapperElem = targetThElem.parentNode;
            const newIndex = sortableEvent.newIndex;
            const oldIndex = sortableEvent.oldIndex;
            const oldTrElement = wrapperElem.children[oldIndex];
            const currRow = state.pageDataTitle?.splice(oldIndex, 1)[0];
           state.pageDataTitle?.splice(newIndex, 0, currRow)
            if (newIndex > oldIndex) {
                wrapperElem.insertBefore(targetThElem, oldTrElement)
            } else {
                wrapperElem.insertBefore(
                    targetThElem,
                    oldTrElement ? oldTrElement.nextElementSibling : oldTrElement
                )
            }

        },
        //解决向选择列拖动的bug
        onMove(e) {
        return e.related.className.indexOf("filtered") === -1;
      }
    })
}

//解决向选择列拖动的bug
 function tableRowClassName(row) {
      if (row.columnIndex == 0) {
        return "filtered";
      }
      return "";
    }

效果图

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