Detailed explanation of Vue2.0 parent-child component transfer function

This article mainly introduces the detailed tutorial of Vue2.0 parent-child component transfer function. Friends in need can refer to it. I hope it can help everyone.

What is Vue.js

Vue.js (pronounced /vjuː/, similar to view) is a progressive framework for building user interfaces. Unlike other heavyweight frameworks, Vue adopts a bottom-up incremental development design. Vue's core library only focuses on the view layer. It is not only easy to get started, but also easy to integrate with third-party libraries or existing projects. On the other hand, Vue is also fully capable of powering complex single-page applications when combined with single-file components and libraries supported by the Vue ecosystem.

Study notes: In vue2.0, when a parent component calls a child component, it wants to pass the function body in the parent component.

1. Through props: it needs to be passed from the child component Applicable when passing parameters to the parent component

// Parent component.vue

<template>
 <p>
  <ok-input :params=&#39;number&#39; :callback=&#39;callbackNum&#39;></ok-input>
 </p>
</template>
<script type="text/ecmascript-6">
 import okInput from '../ok-input/okinput.vue';
 export default {
  props: {},
  data() {
   return {
    number: {},
    callbackNum: function (x) {
     console.log(x);
    }
   };
  },
  methods: {
  },
  components: {
   'ok-input': okInput
  }
 };
</script>

// Child component.vue

<template>
 <p>
   <input v-model=&#39;numVal&#39; @change=&#39;handleFun&#39;></input>
 </p>
</template>
<script type="text/ecmascript-6">
 import {Input, Select, Option, Button} from 'element-ui';
 import 'element-ui/lib/theme-default/index.css';
 export default {
  props: {
   params: {
    type: Object,
    default: {
     type: ''
    }
   },
   callback: {}
  },
  data() {
   return {
    x: 'hah',  
    numVal: ''
   };
  },
  methods: {
   handleFun(val) {
     this.callback(val); // 将参数传回父组件中的回调函数
   }
  },
  components: {
   'el-input': Input,
  }
 };
</script>

2. Through $emit: Just Applicable when obtaining the current operation object

// 父组件.vue
<template>
 <p>
  <ok-input :params=&#39;inputs&#39; @change=&#39;handleAge&#39;></ok-input>
 </p>
</template>
<script type="text/ecmascript-6">
 import okInput from '../ok-input/okinput.vue';
 export default {
  props: {},
  data() {
   return {
    number: {}
   };
  },
  methods: {
   handleAge(evt) {
    console.log(evt.target.value); // 接收从子组件传过来的当前对象
   }
  },
  components: {
   'ok-input': okInput
  }
 };
</script>

// Child component.vue

<template>
 <p>
   <input v-model=&#39;numVal&#39; @blur=&#39;handleChange&#39;></input>
 </p>
</template>
<script type="text/ecmascript-6">
 import {Input, Select, Option, Button} from 'element-ui';
 import 'element-ui/lib/theme-default/index.css';
 export default {
  props: {
   params: {
    type: Object,
    default: {
     type: ''
    }
   },
   callback: {}
  },
  data() {
   return {
    x: 'hah',  
    numVal: ''
   };
  },
  methods: {
   handleChange(evt) {
    this.$emit('change', evt); // 将当前对象 evt 传递到父组件
   },
  },
  components: {
   'el-input': Input,
  }
 };
</script>

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