聊聊關於樹狀組件element ui

這裡不對element ui做過多介紹，直接介紹工作最常用的一個動態加載樹形組件的常用用法
引入tree組件的程式碼如下：

<el-tree :data="data" :props="props" lazy @node-click="handleNodeClick" :load="loadNode"></el-tree>/* 
    动态加载lazy参数和load方法是必选的,
    lazy:为节点store（TreeStore）中的属性，可输出当前节点进行查看
    load：加载子数据的方法，用法为function(node,reslove){}
    */<script>
  export default {
    data() {      return {
        props:{        //配置父子树的属性名
          label:&#39;parent&#39;,
          children:&#39;sub&#39;
        }
      };
    },
    methods: {    //点击节点的处理事件，可以更改显示节点的内容
      handleNodeClick(data){      //在这里改变加载的数据无法刷新树数据
        //to do something ,load data from server and show the data to the view
        if(data.label == 1){//判断点击节点，choose the node you clicked
        /*to do something*/
        }
        console.log(data.label)
        console.log(data)
      },
      loadNode(node, resolve){
        console.log(node);        if (node.level === 0) {          //初始第一层节点，初始化数据，根节点配置
          return resolve([{ label: &#39;1&#39; }, { label: &#39;2&#39; }, { label: &#39;3&#39; },]);
        }        var data = [];        if(node.data.label == 1){//点击树节点1的处理
          data = [{label:&#39;1-1&#39;},{label:&#39;1-2&#39;},{label:&#39;1-3&#39;}];
        }        if(node.data.label == 2){//点击树节点2的处理
          data = [{label:&#39;2-1&#39;},{label:&#39;2-2&#39;},{label:&#39;2-3&#39;}];
        }
        resolve(data)//加载下级数据!
      }
    }
  };</script>

現在對tree的兩個常用方法分析
1、node-click：節點被點擊時的回調，共三個參數，依序為：傳遞給data 屬性的陣列中該節點所對應的物件、節點對應的Node、節點元件本身。即function（data,node,vuecomponent）{}

node-clikc方法:function(data,node,vueComponent){        //可以进行常用的点击view层展示切换}
data:参数为我们点击的节点的数据对象
node:(node对象）    checked:false//是否选中
    childNodes:Array(3)//子节点
    data:Object//data数据对象
    expanded:true//是否可以展开
    id:1//node的id
    indeterminate:false//和checkbox结合的属性，选框的样式
    isLeaf:false
    level:1//点击的node层级
    loaded:true//加载完
    loading:false//加载中
    parent:Node//父级node
    store:TreeStore//树形数据的store
    text:null
    visible:(...)
    disabled:(...)
    icon:(...)
    key:(...)
    label:"1"
    __ob__:Observer {value: Node, dep: Dep, vmCount: 0}    get checked:ƒ reactiveGetter()    set checked:ƒ reactiveSetter(newVal)    get childNodes:ƒ reactiveGetter()    set childNodes:ƒ reactiveSetter(newVal)    get data:ƒ reactiveGetter()    set data:ƒ reactiveSetter(newVal)    get expanded:ƒ reactiveGetter()    set expanded:ƒ reactiveSetter(newVal)    get id:ƒ reactiveGetter()    set id:ƒ reactiveSetter(newVal)    get indeterminate:ƒ reactiveGetter()    set indeterminate:ƒ reactiveSetter(newVal)    get isLeaf:ƒ reactiveGetter()    set isLeaf:ƒ reactiveSetter(newVal)    get level:ƒ reactiveGetter()    set level:ƒ reactiveSetter(newVal)    get loaded:ƒ reactiveGetter()    set loaded:ƒ reactiveSetter(newVal)    get loading:ƒ reactiveGetter()    set loading:ƒ reactiveSetter(newVal)    get parent:ƒ reactiveGetter()    set parent:ƒ reactiveSetter(newVal)    get store:ƒ reactiveGetter()    set store:ƒ reactiveSetter(newVal)    get text:ƒ reactiveGetter()    set text:ƒ reactiveSetter(newVal)    get visible:ƒ reactiveGetter()    set visible:ƒ reactiveSetter(newVal)
    __proto__:Object
具体用法//node-click函数handleNodeClick(data,parent,child){    //to do something ,load data from server and show the data to the view
     if(data.label == 1){//判断点击节点，进行view层试图切换，choose the node you clicked
     /*to do something*/
     }
}

2、load方法
load:載入子資料的方法，一般形式為function(node,reslove){},運用了promise記得進行promise相容

loadNode(node, resolve){
        console.log(node);        if (node.level === 0) {          //初始第一层节点,根节点
          return resolve([{ 'parent': '1' }, { 'parent': '2' }, {'parent': '3' },]);
        }        var data = [];        if(node.data.parent == 1){        //对点击节点加载内容处理
        //一次只能处理一层，sub属性数据被忽略
          data = [{'parent':'1-1','sub':[{            'parent':'1-1-1',
          }]},{'parent':'1-2'},{'parent':'1-3'}];
        }        if(node.data.parent == 2){
          data = [{'parent':'2-1'},{'parent':'2-2'},{'parent':'2-3'}];
        }        //内容更新
        resolve(data)
      }

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