专栏目标
在vue和element UI联合技术栈的操控下,本专栏提供行之有效的源代码示例和信息点介绍,做到灵活运用。
(1)提供vue2的一些基本操作:安装、引用,模板使用,computed,watch,生命周期(beforeCreate,created,beforeMount,mounted, beforeUpdate,updated, beforeDestroy,destroyed,activated,deactivated,errorCaptured,components,)、 $root , $parent , $children , $slots , $refs , props, $emit , eventbus ,provide / inject, Vue.observable, $listeners, $attrs, $nextTick , v-for, v-if, v-else,v-else-if,v-on,v-pre,v-cloak,v-once,v-model, v-html, v-text, keep-alive,slot-scope, filters, v-bind,.stop, .native, directives,mixin,render,国际化,Vue Router等
(2)提供element UI的经典操作:安装,引用,国际化,el-row,el-col,el-button,el-link,el-radio,el-checkbox ,el-input,el-select, el-cascader, el-input-number, el-switch,el-slider, el-time-picker, el-date-picker, el-upload, el-rate, el-color-picker, el-transfer, el-form, el-table, el-tree, el-pagination,el-badge,el-avatar,el-skeleton, el-empty, el-descriptions, el-result, el-statistic, el-alert, v-loading, $message, $alert, $prompt, $confirm , $notify, el-breadcrumb, el-page-header,el-tabs ,el-dropdown,el-steps,el-dialog, el-tooltip, el-popover, el-popconfirm, el-card, el-carousel, el-collapse, el-timeline, el-divider, el-calendar, el-image, el-backtop,v-infinite-scroll, el-drawer等
本文章目录
- 专栏目标
- 需求背景
- 示例效果
- 示例源代码
- 父组件(共99行)
- 子组件 child.vue(共37行)
- 理论介绍
需求背景
这是一个父子组件之间的控制方法,父组件可以通过‘ c h i l d r e n ’ 或 ′ children’或' children’或′refs’来控制子组件中的方法;子组件可以通过$parent或 $emit来控制子组件中的方法
示例效果
示例源代码
父组件(共99行)
/*
* @Author: 大剑师兰特(xiaozhuanlan),还是大剑师兰特(CSDN)
* @此源代码版权归大剑师兰特所有,可供学习或商业项目中借鉴,未经授权,不得重复地发表到博客、论坛,问答,git等公共空间或网站中。
* @Email: 2909222303@qq.com
* @weixin: gis-dajianshi
* @First published in CSDN
* @First published time: 2022-09-04
*/
<template>
<div class="container">
<div class="top">
<h3>父子方法控制:$emit,$refs,$parent,$children </h3>
<div class="author">大剑师兰特, 还是大剑师兰特,gis-dajianshi</div>
</div>
<el-button size="mini" type="primary" @click="showc1()"> refs子组件控制1 </el-button>
<el-button size="mini" type="primary" @click="showc2()"> children子组件控制2 </el-button>
<Childcom ref="mychild" @showP='showP2' />
<div v-if="isParent2">
这是用$emit方法显示的父组件信息 (parent2)
</div>
<div v-if="isParent1">
<div class="oneLine" v-for="(item,index) in listData" :key="index">
<div class="fl20"><img :src="item.thumbnail_pic_s" alt=""></div>
<div class="fl20"> {{item.date}} </div>
<div class="fl20">{{item.title}} </div>
</div>
</div>
</div>
</template>
<script>
import Childcom from '@/components/child.vue'
export default {
data() {
return {
listData:[],
isParent1:false,
isParent2:false,
}
},
components: {
Childcom
},
mounted() {
this.getdata()
},
methods: {
showc1(){
this.$refs.mychild.showChild1()
},
showc2(){
console.log(this.$children)
this.$children[2].showChild2()
},
showP1(){
this.isParent1=true;
},
showP2(){
this.isParent2=true;
},
getdata() {
let url = "/listdata"
this.$request(url, {}, "GET")
.then((res) => {
this.listData = res.data.data
console.log(this.listData)
})
},
}
}
</script>
<style scoped>
.container {
width: 1000px;
height: 540px;
margin: 50px auto;
border: 1px solid orange;
}
.top{
margin:0 auto 30px; padding:10px 0;
background-color: aquamarine;
}
.oneLine {
width: 100%;
height: 50px;
line-height: 50px;
background: #eee;
margin-top: 10px;
overflow: hidden;
cursor: pointer;
}
.oneLine .fl20{ float: left; padding:0 10px;min-width: 150px;}
</style>
子组件 child.vue(共37行)
<template>
<div>
<div v-if="is1">{{text1}}</div>
<div v-if="is2">{{text2}}</div>
<hr>
<el-button @click="showparent1()" type="danger" size="mini"> 开启父组件内容1</el-button>
<el-button @click="showparent2()" type="danger" size="mini"> 开启父组件内容2</el-button>
</div>
</template>
<script>
export default{
data() {
return {
is1:false,
is2:false,
text1:'通过第一种方法显示出来',
text2:'通过第二种方法显示出来',
}
},
methods:{
showChild1(){
this.is1=true;
},
showChild2(){
this.is2=true;
},
showparent1(){
this.$parent.showP1();
},
showparent2(){
this.$emit('showP')
},
},
}
</script>
理论介绍
父组件访问子组件:使用this.$children或 $refs
this.$children得到是一个子组件数组,它包含所有子组件对象。
子组件访问父组件:使用this.$parent , this.$emit
子组件访问根Vue实例:使用this.$root