Vue Element 分组+多选+可搜索Select选择器实现示例

npm install --save linq

module:{
 ......
 //添加
 new webpack.ProvidePlugin({
 Enumerable: "linq"
 })
}

var selectList = [
 {
 name:""，//一级名称
 CName:"", //二级名称
 value:"" //值
 },
 {name:"",CName:"",value:""},
 ......
]

data (){
 return{ 
 selectModel: [],
 multipleSelectOption:[],
 }
},
methods:{
 //将源数据转成element所需格式
 transMultipleSelectOption(){
 var level1List = Enumerable.from(this.allSelectList).distinct("o=>o.name").toArray();
 
 var newArr = level1List.map(item=>{
 let children = Enumerable.from(this.allSelectList).where((o)=>{return o.name==item.name;}).toArray();

 var options = children.map(itemc=>{
 return {"name": itemc.CName, "value":itemc.value};
 }); 
 return {"name": item.name, "options":options}
 });
 this.multipleSelectOption = newArr;
 }, 
 //重置options(select自动补全相关)
 remoteMethod(queryString, lists) { //lists:原始数据
 var mappedList = Enumerable.from(lists).where((o)=>{return o.CName.indexOf(queryString)!=-1 
 || o.name.indexOf(queryString)!=-1;}).toArray(); //找出匹配搜索关键字的数据集
 var level1List = Enumerable.from(mappedList).distinct("o=>o.name").toArray(); //从所匹配的数据集中找出所有一级菜单集合（含去重）
 //重新拼成element所需的数据格式
 var newArr = level1List.map(item=>{
 let children = Enumerable.from(mappedList).where((o)=>{return o.name==item.name;}).toArray();

 var options = children.map(itemc=>{
 return {"name": itemc.CName, "value":itemc.value};
 }); 
 return {"name": item.name, "options":options}
 });
 this.multipleSelectOption = newArr;
 },
 //点击一级菜单全选/全不选实现
 checkAll(value){ //value: 点击的一级name
 var list = Enumerable.from(this.multipleSelectOption).where((o)=>{return o.name==value;}).toArray();
 var level2ValueList = Enumerable.from(list[0].options).select("o=>o.value").toArray(); //所有该一级下二级的value集合

 var num=0;
 level2ValueList.forEach((value)=>{
 this.selectModel2.forEach((model, index)=>{
 if(model==value){
 this.selectModel2.splice(index, 1); //如有匹配，先删除
 num++;
 return true;
 }
 })
 })

 if(num < level2ValueList.length){ //需要全选
 this.selectModel2 = this.selectModel2.concat(level2ValueList); //合并数组
 }
 
 }
},
mounted: function(){
 this.transMultipleSelectOption();
},

<el-select v-model="selectModel" multiple filterable remote reserve-keyword 
 placeholder="请输入关键词" :remote-method="(queryString)=>{
 remoteMethod(queryString, allSelectList);
 }">
 <el-option-group v-for="group in multipleSelectOption"
 :key="group.name"
 :label="group.name" 
 @click.native="checkAll(group.name)">
 <el-option v-for="item in group.options"
 :key="item.value"
 :label="item.name"
 :value="item.value">
 </el-option>
 </el-option-group>
</el-select>