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使用vue实现树形菜单栏功能

2020-11-27 来源：意榕旅游网
这次给大家带来使用vue实现树形菜单栏功能，使用vue实现树形菜单栏功能的注意事项有哪些，下面就是实战案例，一起来看一下。
<!DOCTYPE html>
<html>
 <head>
 <meta charset="UTF-8">
 <title>vue</title>
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <link rel="stylesheet" href="animate.css">
 <script src="vue.js"></script>
 <style>
 *{
 color:#585858;
 
 }
 #app{
 min-height: 650px;
 }
 #app li{
 list-style-type:none;
 }
 #app a{
 text-decoration:none;
 }
 #app button{
 width:100%;
 }
 #app ul{
 padding:10px;
 }
 #app span{
 cursor:pointer;
 }
 #tree{
 border: 1px solid #ccc; 
 min-height: 650px;
 width: 50%;
 margin:0;
 padding-top: 10px;
 background-color:#f2f2f2;
 position: absolute;
 top:0;
 left:0;
 }
 
 #tree li {
 display: block;
 padding: 0;
 margin: 0;
 border: 0;
 border-bottom: 1px solid #e5e5e5;
 min-height: 32px;
 line-height:32px;
 }
 </style>
 </head>
 <body>
 <p id='app' @click='hideTree($event)'>
 <button @click.stop="show = !show">点我</button>
 
 <transition enter-active-class="animated fadeInLeft" leave-active-class="animated fadeOutLeft">
 <item v-bind:tree='treeData' id='tree' v-if="show"></item> 
 </transition> 
 </p>
 <template id='tree-template'>
 <ul>
 <li v-for='(v,i) in tree'> 
 <span v-if="isFolder(v)" @click="toggle(i)">{{ tree[i].open ? '-' : '+' }}</span>
 <a data-id="v.id">{{v.city}}</a> 
 <item v-bind:tree='v.child' v-show="tree[i].open"></item>
 </li>
 </ul> 
 </template>
 <script>
 var data = [{"id":26,"pid":1,"city":"四川省"},{"id":30,"pid":1,"city":"云南省"},{"id":322,"pid":26,"city":"成都"},{"id":323,"pid":26,"city":"绵阳"},{"id":324,"pid":26,"city":"阿坝"},{"id":325,"pid":26,"city":"巴中"},{"id":326,"pid":26,"city":"达州"},{"id":327,"pid":26,"city":"德阳"},{"id":328,"pid":26,"city":"甘孜"},{"id":329,"pid":26,"city":"广安"},{"id":330,"pid":26,"city":"广元"},{"id":331,"pid":26,"city":"乐山"},{"id":332,"pid":26,"city":"凉山"},{"id":333,"pid":26,"city":"眉山"},{"id":334,"pid":26,"city":"南充"},{"id":335,"pid":26,"city":"内江"},{"id":336,"pid":26,"city":"攀枝花"},{"id":337,"pid":26,"city":"遂宁"},{"id":338,"pid":26,"city":"雅安"},{"id":339,"pid":26,"city":"宜宾"},{"id":340,"pid":26,"city":"资阳"},{"id":341,"pid":26,"city":"自贡"},{"id":342,"pid":26,"city":"泸州"},{"id":367,"pid":30,"city":"昆明"},{"id":378,"pid":30,"city":"曲靖"},{"id":3100,"pid":367,"city":"盘龙区"},{"id":3101,"pid":367,"city":"五华区"},{"id":3102,"pid":367,"city":"官渡区"},{"id":3103,"pid":367,"city":"西山区"},{"id":3104,"pid":367,"city":"东川区"},{"id":3105,"pid":367,"city":"安宁市"},{"id":3106,"pid":367,"city":"呈贡县"},{"id":3107,"pid":367,"city":"晋宁县"},{"id":3108,"pid":367,"city":"富民县"},{"id":3109,"pid":367,"city":"宜良县"},{"id":3110,"pid":367,"city":"嵩明县"},{"id":3111,"pid":367,"city":"石林县"},{"id":3112,"pid":367,"city":"禄劝"},{"id":3113,"pid":367,"city":"寻甸"},{"id":3189,"pid":378,"city":"麒麟区"},{"id":3190,"pid":378,"city":"宣威市"},{"id":3191,"pid":378,"city":"马龙县"},{"id":3192,"pid":378,"city":"陆良县"},{"id":3193,"pid":378,"city":"师宗县"},{"id":3194,"pid":378,"city":"罗平县"},{"id":3195,"pid":378,"city":"富源县"},{"id":3196,"pid":378,"city":"会泽县"},{"id":3197,"pid":378,"city":"沾益县"}];
 var treeData = createTree({
 idname:'id',
 pidname:'pid',
 rootid:1,
 data:data
 });
 function createTree(arg){
 var idname = arg.idname,
 pidname = arg.pidname,
 rootid = arg.rootid,
 data = arg.data,
 treeData = [];
 var _createTree = function(id){
 var ret = []; 
 var index = 0;
 for(var i = 0; i < data.length; i++){ 
 if(data[i][pidname] == id){
 ret[index] = data[i];
 ret[index].child = _createTree(data[i][idname]);
 index++;
 } 
 }
 return ret;
 }
 var index = 0;
 for(var i = 0; i < data.length; i++){ 
 if(data[i][pidname] == rootid){
 treeData[index] = data[i];
 treeData[index].child = _createTree(data[i][idname]);
 index++;
 } 
 }
 return treeData;
 }
 Vue.component('item', {
 template: '#tree-template',
 props: ['tree'],
 data: function () {
 return {}
 },
 methods: {
 toggle: function (i) {
 this.tree[i].open = !this.tree[i].open;
 this.$set(this.tree, i, this.tree[i]);
 },
 isFolder: function (data) {
 return data.child && data.child.length
 },
 },
 })
 var vm = new Vue({
 el: '#app',
 data: {
 treeData: treeData,
 show:false,
 },
 methods: {
 hideTree:function(e){
 if(e.target.id == 'app'){
 console.log(137);
 this.show = false;
 }
 }
 },
 created: function () {
 function _addOpen(data) {
 for (var i = 0; i < data.length; i++) {
 data[i]['open'] = false;
 if (data[i].child.length > 0) {
 _addOpen(data[i].child);
 }
 }
 }
 _addOpen(this.treeData);
 }
 });
 </script>
 </body>
</html>
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