What to do if there is an error in vue sync

Solution to vue sync error: 1. Modify the data passed by the parent component, with code such as "<child-dialog :name.sync="userName"></child-Dialog>"; 2. Put the basic data type value that needs to be transferred into the object, with the code such as "".

#The operating environment of this tutorial: Windows 10 system, Vue version 3, Dell G3 computer.

What should I do if there is an error in vue sync?

Vue modifier.sync (Avoid mutating a prop directly since .......A solution to error reporting)

Preface

We all know that a child component will report an error when modifying the props passed by the parent component, as shown below

1. What is .sync

When we When you want to modify data across parent-child components, you need to communicate between the parent and child components. Pass from parent to child: bind data to the child component and then the child component uses props to receive it. When passing from child to parent, the parent component needs to bind events on the component, and the child component needs to bind the event on the component. Use $emit to pass events; such data modification is a bit troublesome to write. The .sync modifier is an abbreviation for the above subcomponent to modify the parent component data

2. The use of .sync

Grammar:

：props名称 . sync=“props值”
$emit( “ update：props名称 ” ,新值)

Parent component

<child-dialog :name.sync="userName"></child-Dialog>

Child component

<el-button type="primary" @click="changeName(&#39;王五&#39;)">修改名字</el-button>

methods:{
changeName(newName){
//修改父组件传过来的数据
this.$emit('update:name', newName)
}
}

:name.sync修饰符其实是以下代码的缩写
@update:name="val => name= val"

3. Methods for bidirectional bonding of other props

Transfer object

Put the basic data type value that needs to be transferred into the object. If the value in the object is modified in the subcomponent, no error will be reported. The principle is that the object is a complex data type and the subcomponent receives it. The received object and the object passed by the parent component share the same memory address, so the effect of two-way bonding can be achieved.

Parent component

<div>
<child-dialog :toChildObj="obj"></child-Dialog>
<p>
<span>名字：</span>{{name}}
</p>
</div>

export default {
data(){
return{
obj:{
name: "张三"
}
}
}
}

Sub component

<el-button type="primary" @click="changeName(&#39;王五&#39;)">修改名字</el-button>

export default {
props:{
toChildObj:{
type:Object,
default:{}
},
},
data(){
return{}
},
methods:{
changeName(newName){
//修改父组件传过来的数据
this.toChildObj.name = newName;
}
}
}

Recommended learning: "vue.js video tutorial"

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