How to implement two-way binding between Vue2 parent component and child component

This time I will show you how to implement the two-way binding of the Vue2 parent component and the child component. What are the precautions ? The following is a practical case. Let’s take a look.

Recently I was studying how to write a set of UI components based on Vue2. To achieve two-way binding, I thought about using Vuex, but after observing other excellent UIframework, I found that using Vuex would cause trouble to other users, so I decided to find a solution and consulted several articles. After many articles, I finally found it.

I post the solution here, hoping to help colleagues like me who are new to the Vue framework.

Code logic of subcomponents

<template> 
 <p> 
  <input> 
 </p> 
</template> 
 
<style> 
 @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>

Parent component code logic

<template> 
 <p> 
  <ne-ipt></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 subcomponent, the input event is actually triggered through $emit and the value is passed to the caller's v-model, thereby achieving two-way binding.

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

Recommended reading:

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How to reference local static images in vue

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