本文实例讲述了vue实现的树形结构加多选框。分享给大家供大家参考,具体如下:
前面说了如何用递归组件来写vue树形结构,写了树形结构还要在前面加多选框,然后往数组里push选项,并在左边显示出来,然后左边进行拖拽排序,拖拽排序上一篇文章我已经介绍过了,在这我就不介绍了,如何用阿里巴巴矢量图标库我也有相关文章,也不介绍了,本节主要介绍vue树形结构加多选框,并实现一定的逻辑,比如全选,单选,全选和单选之间的联动
先看下目录结构
下面我直接贴下代码
首先是pages文件夹中tree.vue页面中引用组件
下面是tree.vue的代码
<template> <div class = "loginModuel"> <Tree :menus = "menus" :depth = "depth" @selectItem = "selectItem" :actId = "actId" @checkItem = "checkItem"></Tree> </div> </template> <script src = "./index.js"></script> <style lang = "scss" scoped src = "./index.scss"></style>
然后是tree.vue引入的index.js的代码
import Tree from '../../components/tree/tree'; import axios from 'axios'; export default{ data(){ return{ msg:"这是登录页面", depth:0, menus:[], actId:"", } }, components:{ Tree }, methods:{ //用ajax获取数据 getData(){ return axios.get('/static/json/data.json'); }, // 调用ajax函数 async getTree(){ var last = await this.getData(); if(last.data.code == 1){ this.menus = last.data.data; //在每一项中添加selectArr和show this.addShow(this.menus); } }, //递归函数在每一项中添加selectArr和show addShow(arr){ for(var i = 0; i < arr.length;i++){ this.$set(arr[i],"show",true); this.$set(arr[i],"selectArr",[]); if(arr[i].userList && arr[i].userList.length > 0){ this.addShow(arr[i].userList) } } }, //点击箭头使树展开收缩 selectItem(data){ if(data.userList && data.userList.length > 0){ //如果此项下有userList且length大于0,则切换展开与折叠状态 data.show = !data.show; }else{ //如果此项下没有userList或length等于0,则将选中的id赋值给actId this.actId = data.id; } }, //进行多选勾选 checkItem(data){ if(data.selectArr.length > 0){ //如果这一项的selectArr有值,说明是被勾选状态,要把selectArr清空,清空勾选 data.selectArr = []; //如果此选项清空勾选后,如果下面有userList的话,那么也同时要清空 if(data.userList && data.userList.length > 0){ this.clearChild(data.userList); } //如果此选项清空勾选后,要把所有的父元素,也全部清空勾选,因为它不勾选了,所有父元素的状态不可能还处于勾选状态,不管它勾选不勾选,我们都要清除一遍,以防万一 this.clearFather(this.menus,data); }else{//如果这一项的selectArr为[],说明是未被勾选状态,在selectArr里加id值,添加勾选 data.selectArr.push(data.id); //如果此选项清空勾选后,如果下面有userList的话,那么也同时勾选下面所有的孩子 if(data.userList && data.userList.length > 0){ this.addChild(data.userList); } //如果此选项勾选后,要判断所有的上级元素是不是应该全部打勾 this.selectFather(this.menus,data); } }, //定义函数清空所有孩子的勾选 clearChild(arr){ for(var i = 0; i < arr.length;i++){ arr[i].selectArr = []; if(arr[i].userList && arr[i].userList.length > 0){ this.clearChild(arr[i].userList); } } }, //定义函数添加所有孩子的勾选 addChild(arr){ for(var i = 0; i < arr.length;i++){ arr[i].selectArr.push(arr[i].id); if(arr[i].userList && arr[i].userList.length > 0){ this.addChild(arr[i].userList); } } }, //定义函数一层一层的往上寻找父元素的userList clearFather(father,data){ for(var i = 0; i < father.length;i++){ if(father[i].id == data.id){ //找到data所在的userList为father,然后再通过这个userList找到拥有这个userList的父元素 this.clearRealFather(this.menus,father); }else if(father[i].userList && father[i].userList.length > 0){ this.clearFather(father[i].userList,data); } } }, //定义函数根据找到的上层父元素的userList来寻找父元素,并将他们清除勾选 clearRealFather(menus,arr){ for(var i = 0; i < menus.length;i++){ if(menus[i].userList == arr){ //找到这个拥有userList的父元素后,将此selectArr清空 menus[i].selectArr = []; //找到这个拥有userList的父元素后,再调用clearFather,再进行向上寻找父元素,知道没有父元素为止 this.clearFather(this.menus,menus[i]); }else if(menus[i].userList && menus[i].userList.length > 0){ this.clearRealFather(menus[i].userList,arr); } } }, //定义函数一层一层的往上寻找父元素的userList selectFather(father,data){ for(var i = 0; i < father.length;i++){ if(father[i].id == data.id){ var arr = []; for(var j = 0; j < father.length;j++){ if(father[j].selectArr.length > 0){ arr.push(father[i]); } } //判断此数组中是不是所有的selectArr都有值,如果有值,就执行selectRealFather,将上层父元素也勾选 if(arr.length == father.length){ this.selectRealFather(this.menus,father); } }else if(father[i].userList && father[i].userList.length > 0){ this.selectFather(father[i].userList,data); } } }, //定义函数根据找到的上层父元素的userList来寻找父元素,并将他们清除勾选 selectRealFather(menus,arr){ for(var i = 0; i < menus.length;i++){ if(menus[i].userList == arr){ //找到这个拥有userList的父元素后,给selectArr赋值,使其勾选 menus[i].selectArr.push(menus[i].id); //找到这个拥有userList的父元素后,再调用clearFather,再进行向上寻找父元素,知道没有父元素为止 this.clearFather(this.menus,menus[i]); }else if(menus[i].userList && menus[i].userList.length > 0){ this.selectRealFather(menus[i].userList,arr); } } } }, mounted(){ this.getTree(); } }
然后是树形组件components文件夹中tree.vue的代码
1.tree.vue
<template> <ul class = "treeMoudel"> <li v-for = "(item,index) in menus" :key = "index"> <!-- 遍历menus,如果传过来的depth等于0,就添加topNode的class,如果不等于0,就添加noTopNode的class --> <div :class = "{'itemTree':true,'topNode':depth == 0,'noTopNode':depth != 0,'active':actId == item.id}"> <!-- 判断如果含有name字段就显示name字段 --> <span :style = "transform" v-if = "item.name" :class = "{'topSpan':depth == 0,'noTopSpan':depth != 0}"> <!-- 如果item有孩子且item.show为false,那么图标为折叠图标 --> <i class = "el-icon-caret-right" v-if = "item.userList && item.userList.length > 0 && !item.show" @click = "selectItem(item)"></i> <!-- 如果item有孩子且item.show为true,那么图标为展开图标 --> <i class = "el-icon-caret-bottom" v-if = "item.userList && item.userList.length > 0 && item.show" @click = "selectItem(item)"></i> <i class = "selectBox" @click = "checkItem(item)"> <!-- 如果item的selectArr.length是大于0的,也就是里面有值的话就是勾选状态,否则就是不勾选状态 --> <i :class = "{'checkName iconfont':true, 'gouxuan5':item.selectArr.length > 0}" ></i> </i> {{item.name}} </span> <!-- 判断如果含有username字段就显示username字段 --> <span :style = "transform" v-if = "item.username" :class = "{'topSpan':depth == 0,'noTopSpan':depth != 0}"> <!-- 如果item有孩子且item.show为false,那么图标为折叠图标 --> <i class = "el-icon-caret-right" v-if = "item.userList && item.userList.length > 0 && !item.show" @click = "selectItem(item)"></i> <!-- 如果item有孩子且item.show为true,那么图标为展开图标 --> <i class = "el-icon-caret-bottom" v-if = "item.userList && item.userList.length > 0 && item.show" @click = "selectItem(item)"></i> <i class = "selectBox" @click = "checkItem(item)"> <!-- 如果item的selectArr.length是大于0的,也就是里面有值的话就是勾选状态,否则就是不勾选状态 --> <i :class = "{'checkUsername iconfont':true, 'gouxuan5':item.selectArr.length > 0}"></i> </i> {{item.username}} </span> </div> <el-collapse-transition> <!-- 递归组件就是自己调用自己,这里是在自己的组件内再次调用自己,但是务必要和pages中的tree页面中使用的一模一样才可以,否则树不会生效 --> <Tree v-if = "item.userList && item.userList.length > 0 && item.show" :menus = "item.userList" :depth = "depth+4" @selectItem = "selectItem" :actId = "actId" @checkItem = "checkItem"></Tree> </el-collapse-transition> </li> </ul> </template> <script src = "./index.js"></script> <style src = "./index.scss" lang = "scss" scoped></style>
2.tree.vue中引入的index.js
export default{ name:"Tree", props:["menus","depth","actId"], data(){ return{ msg:"这是二级菜单树", } }, methods:{ // 将selectItem方法暴露出去 selectItem(item){ this.$emit("selectItem",item); }, // 将checkItem方法暴露出去 checkItem(item){ this.$emit("checkItem",item); } }, computed:{ //通过传过来的depth计算下级目录的偏移量,这里我用的transform transform(){ return 'transform:translateX(' + this.depth*10 + 'px)'; } } }
3.tree.vue中引入的index.scss
.treeMoudel{ li{ .itemTree{ width: 100%; padding-left:30px; position: relative; &:hover{ background:#2B9EEE; color:#fff; } .selectBox{ display: inline-block; width: 16px; height:16px; border:1px solid #ccc; border-radius: 3px; position: relative; background: #fff; top:2px; .checkName{ position: absolute; top:-16px; left:0px; color:#333; } .checkUsername{ position: absolute; top:-12px; left:0px; color:#333; } } span{ display: inline-block; position: absolute; font-size:14px; } .topSpan{ font-size:16px; } .noTopSpan{ font-size:14px; } } .topNode{ height:55px; line-height: 55px; font-size:16px; cursor: pointer; } .active{ background:#2B9EEE; color:#fff; } .noTopNode{ height:45px; line-height:45px; &:hover{ background:#2B9EEE; cursor: pointer; color:#fff; } } } }
看一下模拟数据的data.json长什么样子吧
{ "code":1, "data":[ { "id":"1.2", "name":"技术部", "userList":[ { "id":"788d", "username":"html", "role":"主管" }, { "id":"sda", "username":"vue", "role":"普通" } ] }, { "id":"1.3", "name":"策划部", "userList":[ { "id":"dsf", "username":"jack", "role":"主管" }, { "id":"asdf", "username":"rose", "role":"普通" } ] } ] }
至此,一个树形组件加多选框就做好了
下面看下效果图
ok,自此这一功能就实现啦,代码讲解我就不写了,注释里写的清清楚楚的,看注释就好啦!
希望本文所述对大家vue.js程序设计有所帮助。