element-plus/packages/tree/doc/basic10.vue

<template>
  <el-tree
    :data="data"
    node-key="id"
    default-expand-all
    draggable
    :allow-drop="allowDrop"
    :allow-drag="allowDrag"
    @node-drag-start="handleDragStart"
    @node-drag-enter="handleDragEnter"
    @node-drag-leave="handleDragLeave"
    @node-drag-over="handleDragOver"
    @node-drag-end="handleDragEnd"
    @node-drop="handleDrop"
  />
</template>

<script>
export default {
  data() {
    return {
      data: [{
        id: 1,
        label: '一级 1',
        children: [{
          id: 4,
          label: '二级 1-1',
          children: [{
            id: 9,
            label: '三级 1-1-1',
          }, {
            id: 10,
            label: '三级 1-1-2',
          }],
        }],
      }, {
        id: 2,
        label: '一级 2',
        children: [{
          id: 5,
          label: '二级 2-1',
        }, {
          id: 6,
          label: '二级 2-2',
        }],
      }, {
        id: 3,
        label: '一级 3',
        children: [{
          id: 7,
          label: '二级 3-1',
        }, {
          id: 8,
          label: '二级 3-2',
          children: [{
            id: 11,
            label: '三级 3-2-1',
          }, {
            id: 12,
            label: '三级 3-2-2',
          }, {
            id: 13,
            label: '三级 3-2-3',
          }],
        }],
      }],
      defaultProps: {
        children: 'children',
        label: 'label',
      },
    }
  },
  methods: {
    handleDragStart(node) {
      console.log('drag start', node)
    },
    handleDragEnter(draggingNode, dropNode) {
      console.log('tree drag enter: ', dropNode.label)
    },
    handleDragLeave(draggingNode, dropNode) {
      console.log('tree drag leave: ', dropNode.label)
    },
    handleDragOver(draggingNode, dropNode) {
      console.log('tree drag over: ', dropNode.label)
    },
    handleDragEnd(draggingNode, dropNode, dropType) {
      console.log('tree drag end: ', dropNode && dropNode.label, dropType)
    },
    handleDrop(draggingNode, dropNode, dropType) {
      console.log('tree drop: ', dropNode.label, dropType)
    },
    allowDrop(draggingNode, dropNode, type) {
      if (dropNode.data.label === '二级 3-1') {
        return type !== 'inner'
      } else {
        return true
      }
    },
    allowDrag(draggingNode) {
      return draggingNode.data.label.indexOf('三级 3-2-2') === -1
    },
  },
}
</script>