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Component value transfer: child components transfer data to parent components

2022-06-21 23:55:00 【Nancy-sn】

Subcomponent pass $emit Method to trigger an event

1. The subcomponent defines a method , Click to send send

2.send When triggered , Will trigger parentsend, Carrying data

3. Custom events , Method of binding parent component handler()

4. Call the method of the parent component

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title></title>
</head>
<body>
<div id="app">
    <p>{
   {parent_msg}}</p>
    <child @parentsend="handler"></child>
</div>
</body>
</html>
<script src="./js/vue.js"></script>
<script>
    // Global components （ Child components ）
    Vue.component("child",{
        template:`
        <div>
            <button @click=send> Send to parent </button>
                
        </div>
        `,
        data(){
            return{
                child_msg:" Data of subcomponents "
            }
        },
        methods:{
            send(){
                // Triggered parentsend, stay parentsend carry child_msg
                this.$emit("parentsend",this.child_msg)
            }
        },
    })

    // Parent component 
    new Vue({
        el:"#app",
        data:{
            parent_msg:""// Parent component data
        },
        methods:{
        handler(msg){
            this.parent_msg=msg;
        }
    }
})


</script>

After operation ：