javascript-从子组件向父组件发送索引以删除v-for中的数组项-VUE.JS 2
作者：互联网
我是使用Vue JS的新手,所以我从Vue 2开始.
我需要删除一个数组项,但是触发该方法的按钮在模板内部,而v-for在父模板内部.
这是我的HTML：
主要
<div id="main">
<div class="panel-group" id="panelGrp">
<div class="row panelTopSpacing" v-for="panel in panels" is="panel-row" :panel.sync="panel" :general-fields="generalFields" :assistants="assistants" :companies="companies" :positions="positions"></div>
</div>
</div>
儿童
//CHILD TEMPLATE
<template id="panelsTpl">
<div class="panel panel-success">
<div class="panel-heading">
{{panel.title}}
<a :class="panel.classObj.link" role="button" data-toggle="collapse" data-parent="#panelGrp" :href.sync="'#'+panel.id"></a>
<i :class="panel.infoIcon"></i>
</div>
<div :id.sync="panel.id" :class="panel.classObj.panel">
<div class="panel-body">
<div class="container-fluid" v-if="panel.id === 'genInfo'">
<div class="row">
<div v-for="genField in generalFields" is="general-field" :gen-field.sync="genField"></div>
</div>
</div>
<div class="container-fluid" v-else-if="panel.id === 'assistants'">
<div class="row">
<table class="table table-striped table-responsive table-hover">
<tr>
<th>Internal?</th>
<th>Can read?</th>
<th>Position</th>
<th>Name</th>
<th>Company</th>
<th width="50px"> </th>
</tr>
<tr>
<td><input type="checkbox"></td>
<td><input type="checkbox" ></td>
<td></td>
<td><input type="text" class="form-control"></td>
<td></td>
<td><a href="#" @click="addAssistant()"><span class="glyphicon glyphicon-ok" aria-hidden="true"></span></a></td>
</tr>
<tr v-for="(assistnt,index) in assistants" is="assistant-row" :assistant.sync="assistnt"></tr>
</table>
</div>
</div>
</div>
</div>
</div>
</template>
儿童模板
<template id="asstntsTpl">
<tr v-if="! editing">
<td>{{ assistant.internal }}</td>
<td>{{ assistant.allowRead }}</td>
<td>{{ assistant.positionId | position }}</td>
<td>{{ assistant.name }}</td>
<td>{{ assistant.cmpnyId | company }}</td>
<td>
<a href="#" @click="edit()"><span class="glyphicon glyphicon-pencil" aria-hidden="true"></span></a>
<a href="#" @click="remove(index)"><span class="glyphicon glyphicon-trash" aria-hidden="true"></span></a>
</td>
</tr>
<tr v-else>
<td><input type="checkbox" v-model="assistant.internal"></td>
<td><input type="checkbox" v-model="assistant.allowRead"></td>
<td><!--<select-position :position="positions" :id.sync="assistant.positionId"></select-position>--></td>
<td><input type="text" v-model="assistant.name" class="form-control"></td>
<td><!--<select-company :company="companies" :id.sync="assistant.cmpnyId"></select-company>--></td>
<td><a href="#" @click="update()"><span class="glyphicon glyphicon-ok" aria-hidden="true"></span></a></td>
</tr>
</template>
JS：
var main = new Vue({
el: "#main",
data: {
valid: false,
new_assistant: {
id: "",
name: "",
internal: true,
cmpnyId: "",
positionId: "",
allowRead: false
},
panels: [
{id: "genInfo", title: "General Info", classObj: {panel: "panel-collapse collapse in", link: ""}, infoIcon: "fas fa-file-alt infoIcon pull-right"},
{id: "assistants", title: "Assistants", classObj: {panel: "panel-collapse collapse", link: "collapsed"}, infoIcon: "fas fa-users infoIcon pull-right"},
{id: "agrmtns", title: "Agreements", classObj: {panel: "panel-collapse collapse", link: "collapsed"}, infoIcon: "fas fa-file-signature infoIcon pull-right"}
]
assistants: [
{id: "1",
name: "Bob",
internal: true,
cmpnyId: "1",
positionId: "1",
allowRead: false},
{id: "2",
name: "John",
internal: true,
cmpnyId: "1",
positionId: "1",
allowRead: false}
],
companies: [
{id: "1", name: "cmpny1"},
{id: "2", name: "cmpny2"},
{id: "3", name: "cmpny3"}
],
positions: [
{id: "1", name: "Pos1"},
{id: "2", name: "Pos2"},
{id: "3", name: "Pos3"}
]
},
methods: {
addAssistant: function () {
this.assistants.push(this.new_assistant);
this.new_assistant = {
id: "",
name: "",
internal: true,
cmpny_id: "",
position_id: "",
allowRead: false};
}
}
此时一切正常,但是当我尝试从填充了助手数组的表中删除一行时,它删除了第一行,但是我单击了第二行的废纸icon图标.
VUE组件：
Vue.component("assistant-row", {
template: "#asstntsTpl",
props: ["nw-assistant", "assistant"],
data: function () {
return {
editing: false
};
},
methods: {
remove: function (index) {
this.$parent.assistants.splice(**index**, 1);
},
edit: function () {
this.editing = true;
},
update: function () {
this.editing = false;
}
}
});
似乎拼接根本不起作用.
PD ：：：
我知道如何在简单的情况下使用它,例如：
<li v-for="cat,index in categories">
<button @click="remove(index)">Remove</button>
</li>
我做了这个小jsfiddle来模拟上面的代码：
https://jsfiddle.net/empiricalDev/eywraw8t/399050/
提前致谢.
问候！
解决方法:
您可以尝试使用this.$emit()向父组件发出事件,例如this.$emit(“ delete”,this.todo);.它将事件名称作为第一个参数并将this.todo作为第二个参数,在父组件中添加@ delete =“ removechild”,如下所示：
< tod v-for =“(todos,索引)in todos”：todo =“ todo” @ delete =“ removechild”< // tod>
并在父组件中实现您的removechild,如下所示：
removechild(todo){
this.todos.splice(this.todos.indexOf(todo),1);
}
注意 ：
如果您的道具是{id：1,name：“ todo 1”}之类的对象,则可以像这样过滤您的todos数组.todos= this.todos.filter((item)=> {return item.id！= todo .ID});
Vue.component("tod",{
template:"#tpl",
props:["todo"],
methods: {
remove: function() {
this.$emit("delete",this.todo);
}
}
});
new Vue({
el: '#app',
data: {
todos: ['Buy milk', 'Do exercises', 'Write a book', 'Plant a tree']
},
methods:{
removechild(todo){
this.todos= this.todos.filter((item)=>{return item!=todo});
}
}
})body {
background: #20262E;
padding: 20px;
font-family: Helvetica;
}
#app {
background: #fff;
border-radius: 4px;
padding: 20px;
transition: all 0.2s;
}
li {
margin: 8px 0;
}
h2 {
font-weight: bold;
margin-bottom: 15px;
}
del {
color: rgba(0, 0, 0, 0.3);
}<!DOCTYPE html>
<html>
<head>
<meta name="description" content="Vue.delete">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>JS Bin</title>
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.2.1/vue.min.js"></script>
</head>
<body>
<div id="app">
<ol>
<tod v-for="(todo, index) in todos" :todo="todo" @delete="removechild"></tod>
</ol>
</div>
<template id="tpl">
<li>
{{todo}}
<button @click="remove">×</button>
</li>
</template>
</body>
</html>标签：array-splice,vue-js,vue-component,vuejs2,javascript 来源： https://codeday.me/bug/20191025/1924782.html