uniapp 子组件向父组件传值

ゝ一纸荒年。 2021-11-24 01:08 1147阅读 0赞

使用组件可以减少代码的重复率，提高写代码的效率，改起来也方便。

最近在使用uni-app做项目，一套代码多端实现，做些简单的项目还是可以的。废话少说，说说子组件向父组件传值。

子组件获取到值的时候，使用$emit传给父组件：

this.$emit("getChild1",this.list);

父组件首先引入子组件：

import child1 from './child1'

注册子组件：

components: {
    			child1,
    			child2
    		},

然后可以使用子组件：

注意，子组件的提交的函数名，和父组件里使用子组件@后的名字是一样的。

![20190727125116805.png][]

![2019072712441717.png][]

但是要注意：子组件获取数据的函数要在created()\{\}里面获取，这个坑，要注意！！

在methods里可以获取到子组件的数据：

getChild1(e){
    				console.log(e)
    			},

效果大概就是这样：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoaWNob25nMTIz_size_16_color_FFFFFF_t_70][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoaWNob25nMTIz_size_16_color_FFFFFF_t_70 1][]

代码我也贴出来好了：

首页是，目录结构：![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoaWNob25nMTIz_size_16_color_FFFFFF_t_70 2][]

res.json:

{
    	"code": 100,
    	"fruitData": [
    		"西红柿",
    		"黄瓜",
    		"苹果"
    	],
    	"filmData": [
    		"西红柿首富",
    		"101次求婚",
    		"肖申克的救赎"
    	]
    }

child1:

<template>
    	<view class="content">
    		<view v-for="(item,index) in list" :key="index">{
       {item}}</view>
    	</view>
    </template>
    
    <script>
    	export default {
    		data() {
    			return {
    				list: []
    			}
    		},
    		components: {
    		},
    		onLoad() {},
    		created() {
    			var data = require('../../static/res.json')
    			this.list = data.fruitData
    			this.$emit("getChild1",this.list);
    		},
    		methods: {
    		}
    	}
    </script>
    
    <style>
    	.content {
    		display: flex;
    		flex-direction: column;
    		align-items: center;
    		justify-content: center;
    	}
    
    	.logo {
    		height: 200upx;
    		width: 200upx;
    		margin-top: 200upx;
    		margin-left: auto;
    		margin-right: auto;
    		margin-bottom: 50upx;
    	}
    
    	.text-area {
    		display: flex;
    		justify-content: center;
    	}
    
    	.title {
    		font-size: 36upx;
    		color: #8f8f94;
    	}
    </style>

child2:

<template>
    	<view class="content">
    		<view v-for="(item,index) in list" :key="index">{
       {item}}</view>
    	</view>
    </template>
    
    <script>
    	export default {
    		data() {
    			return {
    				list: []
    			}
    		},
    		components: {
    		},
    		onLoad() {},
    		created() {
    			var data = require('../../static/res.json')
    			this.list = data.filmData
    			this.$emit("getChild2",this.list);
    		},
    		methods: {
    		}
    	}
    </script>
    
    <style>
    	.content {
    		display: flex;
    		flex-direction: column;
    		align-items: center;
    		justify-content: center;
    	}
    
    	.logo {
    		height: 200upx;
    		width: 200upx;
    		margin-top: 200upx;
    		margin-left: auto;
    		margin-right: auto;
    		margin-bottom: 50upx;
    	}
    
    	.text-area {
    		display: flex;
    		justify-content: center;
    	}
    
    	.title {
    		font-size: 36upx;
    		color: #8f8f94;
    	}
    </style>

parent:

<template>
    	<view class="content">
    		<view class="btn-container">
    			<button @click="getData(index)" v-for="(item,index) in list" :key="index">{
       {item}}</button>
    		</view>
    		<child1 @getChild1 = "getChild1" v-if="current==0"></child1>
    		<child2 @getChild2 = "getChild2" v-if="current==1"></child2>
    	</view>
    </template>
    
    <script>
    	import child1 from './child1'
    	import child2 from './child2'
    	
    	export default {
    		data() {
    			return {
    				list:[
    					'水果',
    					'电影'
    				],
    				current:0
    			}
    		},
    		onLoad() {
    
    		},
    		components: {
    			child1,
    			child2
    		},
    		methods: {
    			getData(index){
    				this.current = index
    			},
    			getChild1(e){
    				console.log(e)
    			},
    			getChild2(e){
    				console.log(e)
    			}
    		}
    	}
    </script>
    
    <style>
    	.content {
    		display: flex;
    		flex-direction: column;
    		align-items: center;
    		justify-content: center;
    	}
    	.btn-container{
    		display: flex;
    		justify-content: space-between;
    		align-items: center;
    	}
    </style>

大概就是这些。

[20190727125116805.png]: /images/20211122/c163096fde9641deb3ffd2e5440185db.png
[2019072712441717.png]: /images/20211122/61558ebadfd74cb98e26b307edf0f8e5.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoaWNob25nMTIz_size_16_color_FFFFFF_t_70]: /images/20211122/1f310140b4fe4347b3ed2b44ed88420e.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoaWNob25nMTIz_size_16_color_FFFFFF_t_70 1]: /images/20211122/b87c4c89d03344e98557012ca430c2f3.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NoaWNob25nMTIz_size_16_color_FFFFFF_t_70 2]: /images/20211122/e00ee045d4eb4c31aeac08e4bef4ead7.png