问题描述:
el-select下拉框要求实现全选功能。具体功能包括:
- 当选择【全选】时,所有选项全部被勾选;
- 当选择【反选】时,已选择选项变为未选择选项,未选项变为已选项
- 当选择【清空】时,所有选项变为未选
如下图:
解决方法:
1、给el-select增加【全选】【清空】【反选】按钮
2、为el-select绑定change事件和remove-tag事件,具体实现全选功能写在事件中
实例代码:
组件:
<el-form-item label="关联设备" v-if="node.nodeId != 11 && node.nodeId != 21 && node.nodeId != 22 ">
<el-select style="width: 100% " v-model="node.devices" size="small" multiple collapse-tags filterable placeholder="请选择" :filter-method="dataDevFilter">
<div class="select_up">
<el-button type="text" v-on:click="selectDevAll">
<i class="el-icon-circle-check" />
全选</el-button>
<el-button type="text" v-on:click="removeDevTag">
<i class="el-icon-close" />
清空</el-button>
<el-button type="text" v-on:click="selectDevReverse">
<i class="el-icon-copy-document" />
反选</el-button>
</div>
<div class="select_list">
<el-option
v-for="item in devOptions"
:key="item.deviceCode"
:label="item.deviceName"
:value="item.deviceCode">
</el-option>
</div>
</el-select>
</el-form-item>
js方法:
//用户列表----start
//清空操作
removeTag() {
this.node.users = []
},
//全选操作
selectAll(val) {
this.options.map(item => {
if(!this.node.users.includes(item.userName)){
this.node.users.push(item.userName)
}
})
console.log(this.node.users)
},
//反选操作
selectReverse(val) {
val = []
this.options.map(item => {
let index = this.node.users.indexOf(item.userName);
//判断现有选中数据是否包含如果不包含则进行反选数据
if (index != -1) {
} else {
val.push(item.userName)
}
})
this.node.users = val
},
dataFilter(query) {
// this.value = val //给绑定值赋值
if(query == ''){
//val不存在还原数组
this.options= this.userList
}else{
let result = [] //存储符合条件的下拉选项
this.userList.forEach(val=>{
if(val.nickName.indexOf(query)!=-1) result.push(val)
})
this.options = result
}
},
//用户列表----end
css样式:
<style>
.el-select-dropdown__list {
height: 100%;
overflow: hidden;
}
.select_up {
padding: 0 14px;
font-size: 14px;
position: absolute;
z-index: 99999;
background-color: white;
top: 0px;
width: 100%;
border-radius: 5px 5px 0 0;
::v-deep .el-button {
color: #bcbcbc;
font-size: 14px;
i {
font-size: 14px;
}
}
::v-deep .el-button:hover {
color: #409EFF;
}
.el-button+.el-button {
margin-left: 6px;
}
}
.select_list {
margin-top: 25px;
}
</style>
完整组件
子组件代码如下,请注意代码注释的讲解:
1、props里面需定义value(双向绑定默认的变量,可自定义),父组件通过v-model绑定的fatherValue 会传给子组件props的 value
2、子组件的input框添加@change事件触发sendMsg,sendMsg向父组件传递change事件(双向绑定默认事件,可自定义),同时传递childValue的值
3、添加value的watch监听,当value变化时传递最新值给childValue
<template>
<div>
<el-select style="width: 100% "
v-model="orgData"
size="small"
multiple
collapse-tags
filterable
placeholder="请选择"
:filter-method="dataFilter"
@change="sendMsg()" >
<div class="select_up">
<el-button type="text" v-on:click="selectAll">
<i class="el-icon-circle-check" />
全选</el-button>
<el-button type="text" v-on:click="removeTag">
<i class="el-icon-close" />
清空</el-button>
<el-button type="text" v-on:click="selectReverse">
<i class="el-icon-copy-document" />
反选</el-button>
</div>
<div class="select_list">
<el-option
v-for="item in options"
:key="item.userName"
:label="item.nickName"
:value="item.userName">
</el-option>
</div>
</el-select>
</div>
</template>
<script>
export default {
props: {
value: {
type: Array,
required: []
},
userList: {
type: Array,
required: []
},
options: {
type: Array,
required: []
},
},
watch: {
//监听value变化(slect控件不是必要,暂时不明)
value(newValue, oldValue) {
this.orgData = newValue;
}
},
data() {
return {
orgData: [],//选中数据
}
},
methods: {
//用户列表----start
//清空操作
removeTag() {
this.orgData = []
},
//全选操作
selectAll(val) {
this.options.map(item => {
if(!this.orgData.includes(item.userName)){
this.orgData.push(item.userName)
}
})
console.log(this.orgData)
},
//反选操作
selectReverse(val) {
val = []
this.options.map(item => {
let index = this.orgData.indexOf(item.userName);
//判断现有选中数据是否包含如果不包含则进行反选数据
if (index != -1) {
} else {
val.push(item.userName)
}
})
this.orgData = val
},
dataFilter(query) {
// this.value = val //给绑定值赋值
if(query == ''){
//val不存在还原数组
this.options= this.userList
}else{
let result = [] //存储符合条件的下拉选项
this.userList.forEach(val=>{
if(val.nickName.indexOf(query)!=-1) result.push(val)
})
this.options = result
}
},
//用户列表----end
sendMsg(){
//input是默认双向绑定事件,select控件也可以用input给父组件传递数据
this.$emit('input',this.orgData)
}
}
}
</script>
<style scoped lang="scss">
.el-select-dropdown__list {
height: 100%;
overflow: hidden;
}
.select_up {
padding: 0 14px;
font-size: 14px;
position: absolute;
z-index: 99999;
background-color: white;
top: 0px;
width: 100%;
border-radius: 5px 5px 0 0;
::v-deep .el-button {
color: #bcbcbc;
font-size: 14px;
i {
font-size: 14px;
}
}
::v-deep .el-button:hover {
color: #409EFF;
}
.el-button+.el-button {
margin-left: 6px;
}
}
.select_list {
margin-top: 25px;
}
</style>
父组件引用
<script>
import userSelect from '@/views/processEngine/unit/userSelect'
export default {
components: {
userSelect,deviceSelect
},
</script>
<el-form-item label="关联人员">
<userSelect v-model="node.users" :userList="userList" :options="userList" ></userSelect>
</el-form-item>
注意:
当传值的时候,v-model触发了input事件, 而组件中的props属性默认就使用传入的value值, 但是回传的时候 是通过emit触发的input事件。 如果没有emit, 那么就不会触发input 也就不会反向传值