About two-way binding of parent component and child component in Vue2.x (detailed tutorial)

This article mainly introduces how to solve the two-way binding problem between Vue2. I am using UI components for my own use. To improve my BIG, I encountered a problem when making a component containing input: I don’t know how to achieve two-way binding between the input in the sub-component and the data of the caller (parent component). I thought about using Vuex, but I didn’t know how to use it. After looking at other excellent UI frameworks, I found that using Vuex would cause trouble to other users, so I decided to find a solution. After referring to several articles by experts, I finally found it.

I post the solution here, hoping to help colleagues like me who are coming into contact with the Vue framework for the first time.

The code logic of the child component

<template> 
 <p class="ne-ipt"> 
  <input type="text" v-model="currentValue"> 
 </p> 
</template> 
 
<style lang="less" scoped> 
 @import "../../assets/styles/form/form.less"; 
</style> 
<script> 
 export default { 
  name: &#39;NeIpt&#39;, 
  props: { 
   // 接收一个由父级组件传递过来的值 
   value: { 
    type: String, 
    default: function () { 
     return &#39;&#39; 
    } 
   } 
  }, 
  computed:{ 
   currentValue: { 
    // 动态计算currentValue的值 
    get:function() { 
     return this.value; // 将props中的value赋值给currentValue 
    }, 
    set:function(val) { 
     this.$emit(&#39;input&#39;, val); // 通过$emit触发父组件 
    } 
   } 
  } 
 } 
</script>

The code logic of the parent component

<template> 
 <p id="button-index"> 
  <ne-ipt placeholder="姓名" v-model="test"></ne-ipt> 
 </p> 
</template> 
<style> 
</style> 
<script> 
 import NeIpt from &#39;./NeIpt&#39; 
 export default { 
  name: &#39;form-index&#39;, 
  data () { 
   return { 
    test: &#39;&#39; 
   } 
  }, 
  components: { 
   NeIpt 
  } 
 } 
</script>

When modifying the currentValue of the child component, actually Triggering the input event through $emit will pass the value to the caller's v-model, thereby achieving two-way binding.

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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Vue.js custom event form input component method

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