How to implement the select all function in vue.js

Vue.js method to implement the select-all function: use ordinary event listening methods to process data status, such as [var list = [{title : 'data one',checked : false,},{title : ' Data two',checked: },{title...].

The operating environment of this article: windows10 system, vue.js 2.9, thinkpad t480 computer.

In actual projects, we can use the following two methods to implement the all-select function, as follows:

Method 1: Fully utilize the characteristics of vuejs, and use computed to implement single selection Real-time monitoring of buttons.

<div id="app">
    <div class="box">
        <div class="title">
            <label><input type="checkbox" v-model="status">全选</label>
        </div>
        <ul>
            <li v-for="item,index of list"><label>
                <input type="checkbox" v-model="item.checked">{{item.title}}</label>
            </li>
        </ul>
    </div>
</div>
 
var list = [
    {
        title : &#39;数据一&#39;,
        checked : false,
    },{
        title : &#39;数据二&#39;,
        checked : true,
    },{
        title : &#39;数据三&#39;,
        checked : true,
    },{
        title : &#39;数据四&#39;,
        checked : true,
    },{
        title : &#39;数据五&#39;,
        checked : true,
}];
 
var vm = new Vue({
    el : &#39;#app&#39;,
    data:{
        list
    },
    computed:{
        status:{
            get(){
                return this.list.filter( item => item.checked ).length === this.list.length
            },
            set( value ){
                this.list.map(function( item ){
                    item.checked = value;
                    return item;
                });
            }
        }
    }
});

Method 2: Use ordinary event listening methods to process data status

<div id="app">
    <div class="box">
        <div class="title"><label>
        <input type="checkbox" 
            v-model="status" 
            @change="allCheck">全选</label></div>
        <ul>
            <li v-for="item,index of list">
                <label><input type="checkbox" 
                v-model="item.checked" 
                @change="singleCheck">{{item.title}}</label></li>
        </ul>
    </div>
</div>
var list = [
    {
        title : &#39;数据一&#39;,
        checked : false,
    },{
        title : &#39;数据二&#39;,
        checked : true,
    },{
        title : &#39;数据三&#39;,
        checked : true,
    },{
        title : &#39;数据四&#39;,
        checked : true,
    },{
        title : &#39;数据五&#39;,
        checked : true,
}];
 
var vm = new Vue({
    el : &#39;#app&#39;,
    data : {
        list,
        status : this.list.filter( item => item.checked ).length === this.list.length ? true : false
    },
    methods : {
        allCheck(){
            this.list.map(function( item ){
                item.checked = this.status;
                return item;
            }.bind(this));
        },
        singleCheck(){
            this.status = this.list.filter( item => item.checked ).length === this.list.length ? true : false
        }
    }
});

Explain that in method 2, the event listening function is used, change is used, and click can also be used. When using the click event , there is a bug in the lower version of vuejs, the bug is fixed in the higher version, the bug exists in the lag after using the click data state when the two-way binding state changes.

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