Element-ui tree组件自定义节点使用方法代码详解

工作上使用到element-ui tree 组件，主要功能是要实现节点拖拽和置顶，通过自定义内容方法（render-content）渲染树代码如下~

<template>
 <div class="sortDiv">
  <el-tree :data="sortData" draggable node-key="id" ref="sortTree" default-expand-all :expand-on-click-node="false" :render-content="renderContent" :allow-drop="allowDrop">
  </el-tree>
  <el-button @click="getData">获取数据</el-button>
 </div>
</template>
<script>
export default {
 name: 'Sort',
 data() {
  return {
   sortData: [
    {
     id: 1,
     label: '一级 1',
     checkItem: true,
     children: [
      {
       id: 4,
       label: '二级 1-1',
       checkItem: false
      },
      {
       id: 9,
       label: '二级 1-2',
       checkItem: false
      },
      {
       id: 10,
       label: '二级 1-3',
       checkItem: false
      }
     ]
    },
    {
     id: 2,
     label: '一级 2',
     checkItem: true,
     children: [
      {
       id: 5,
       label: '二级 2-1',
       checkItem: true
      },
      {
       id: 6,
       label: '二级 2-2',
       checkItem: true
      }
     ]
    },
    {
     id: 3,
     label: '一级 3',
     checkItem: true,
     children: [
      {
       id: 7,
       label: '二级 3-1',
       checkItem: true
      },
      {
       id: 8,
       label: '二级 3-2',
       checkItem: false
      }
     ]
    }
   ]
  };
 },
 methods: {
  // 是否允许拖拽
  allowDrop (draggingNode, dropNode, type) {
   if (draggingNode.parent === dropNode.parent) {
    return type !== 'inner'
   }
   else return false
  },
  //获取数据
  getData () {
   let result = this.$refs['sortTree'].data;
   let sortRulesMaps = [];
   result.forEach((element, index) => {
    let item = null;
    if (element.checkItem) {
     if (element.children && element.children.length > 0) {
      item = {
       orderIndex: index,
       sortField: element.label,
       rule: ['OTHERS']
      };
      element.children.forEach(i => {
       if (i.checkItem) {
        item.rule.push(i.label);
       }
      });
      item.rule = item.rule.join('_');
     }
    }
    item && sortRulesMaps.push(item);
   });
  },
  //同级置顶功能
  toTop(node, data) {
    let c = Object.assign({}, data);
    if (node.parent.level === 0) {
     this.sortData.unshift(c)
    } else {
     node.parent.data.children.unshift(c);
    }
    this.$refs['sortTree'].remove(data.id);
  },
  changeNode(r, node, data) {
   data.checkItem = r;
  },
  //自定义内容
  renderContent(h, { node, data }) {
   return (
    <span class="custom-tree-node">
     <span>{data.label}</span>
     <span>
      <el-checkbox
       v-model={data.checkItem}
       checked={data.checkItem}
       on-change={r => this.changeNode(r, node, data)}
      />
      <el-button
       size="mini"
       type="text"
       on-click={() => this.toTop(node, data)}
       style="color:#707375;margin-left:10px"
      >
       <i class="fa fa-arrow-up">置顶</i>
      </el-button>
     </span>
    </span>
   );
  }
 }
};
</script>
<style lang="scss">
.sortDiv {
 .el-icon-caret-right:before {
  content: '\E604';
 }
}
.custom-tree-node {
 flex: 1;
 display: flex;
 align-items: center;
 justify-content: space-between;
 font-size: 14px;
 padding-right: 8px;
}
</style>

补充：下面看下使用element的自定义tree组件的实例代码

在使用elemnet-ui时，需要自定义tree的一些元素，采用 :render-content属性来进行渲染这些元素，但是官网给的例子有一点小坑，

renderContent:function(createElement, { node, data, store }) {
        var self = this;
        return createElement('span', [
          createElement('span', node.label),
          createElement('span', {attrs:{
            style:"float: right; margin-right: 200px"
          }},[
            createElement('el-button',{attrs:{
              size:"mini"
            },on:{
              click:function() {
                console.info("点击了节点" + data.id + "的添加按钮");
                store.append({ id: self.baseId++, label: 'testtest', children: [] }, data);
              }
            }},"添加"),
            createElement('el-button',{attrs:{
              size:"mini"
            },on:{
              click:function() {
                console.info("点击了节点" + data.id + "的删除按钮");
                store.remove(data);
              }
            }},"删除"),
          ]),
        ]);
      }

总结