如何在vue组件的树视图中激活子类别？ [英] How can I activate child category in treeview on the vue component?
问题描述
我有两个vue组件。
I have two vue components.
我的第一个组件（父组件）如下：
My first component (parent component) like this:
<template>
...
<ul class="filter-category" v-for="list in categories">
<list-category :data="list" :category-id="categoryId"></list-category>
</ul>
...
</template>
<script>
...
export default {
...
data() {
return {
categories: [
{
id: 1,
name: 'England',
children: [
{
id: 3,
name: 'Chelsea',
children: [
{id: 7, name: 'Hazard'},
{id: 8, name: 'Morata'}
]
},
{
id: 4,
name: 'Manchester United',
children: [
{id: 9, name: 'Pogba'},
{id: 10, name: 'Lukaku'}
]
}
]
},
{
id: 2,
name: 'Spain',
children: [
{
id: 5,
name: 'Real Madrid',
children: [
{id: 11, name: 'Ronaldo'},
{id: 12, name: 'Bale'}
]
},
{
id: 6,
name: 'Barcelona',
children: [
{id: 13, name: 'Messi'},
{id: 14, name: 'Suarez'}
]
},
]
}
],
categoryId: 7
}
}
}
</script>
我的第二个组件（子组件）如下：
My second component (child component) like this:
<template>
<li>
<!--parent-->
<a v-if="isFolder" href="javascript:" @click="toggle">
<span class="fa fa-fw" :class="icon"></span> {{data.name}}
</a>
<!--if not folding, we do not need an binding event-->
<a v-else href="javascript:" :title="data.name"><span class="fa fa-fw fa-circle-o"></span> {{data.name}}</a>
<!--children-->
<ul v-if="isFolder" :class="isShow">
<list-category v-for="(data, index) in data.children" :key="index" :data="data" :search="search"></list-category>
</ul>
</li>
</template>
<script>
export default {
props: ['data', 'categoryId'],
data() {
return {
open: false
}
},
computed: {
icon() {
return {
'fa-plus': !this.open,
'fa-minus': this.open,
}
},
isFolder() {
return this.data.children && this.data.children.length
},
isShow() {
return this.open ? 'show': 'hide'
}
},
methods: {
toggle() {
this.open = !this.open
}
}
}
</script>
如果道具 categoryId = id 数据中的类别类别，然后我希望该类别处于活动状态。
If prop categoryId = id category in data categories, then I want the category active.
在我的代码中，我想如果代码执行，类别危险活跃如下：
In my code, I want if the code executed, category hazard active like this:
================== ================================================== ======
==========================================================================
< img src =https://i.stack.imgur.com/0gmy9.pngalt =在此处输入图像说明>
== ================================================== ======================
==========================================================================
我该怎么做？
推荐答案
两个实际上缺少的东西：
Two actually missing things:
You have to add the conditional class attribute (
:class="{active: data.id === categoryId}") using the Object Syntax:
<a v-else href="javascript:" :title="data.name" :class="{active: data.id === categoryId}"><span class="fa fa-fw fa-circle-o"></span> {{data.name}}</a>
您必须传递 categoryId 在组件树下（：category-id =categoryId）：
<ul v-if="isFolder" :class="isShow">
<list-category v-for="(data, index) in data.children" :key="index" :data="data" :search="search" :category-id="categoryId"></list-category>
</ul>
演示如下。
Vue.component('list-category', {
template: "#lc",
props: ['data', 'categoryId', 'search'],
data() {
return {
open: false
}
},
computed: {
icon() {
return {
'fa-plus': !this.open,
'fa-minus': this.open,
}
},
isFolder() {
return this.data.children && this.data.children.length
},
isShow() {
return this.open ? 'show' : 'hide'
}
},
methods: {
toggle() {
this.open = !this.open
}
}
})
new Vue({
el: '#app',
data() {
return {
categories: [{
id: 1,
name: 'England',
children: [{
id: 3,
name: 'Chelsea',
children: [{
id: 7,
name: 'Hazard'
},
{
id: 8,
name: 'Morata'
}
]
},
{
id: 4,
name: 'Manchester United',
children: [{
id: 9,
name: 'Pogba'
},
{
id: 10,
name: 'Lukaku'
}
]
}
]
},
{
id: 2,
name: 'Spain',
children: [{
id: 5,
name: 'Real Madrid',
children: [{
id: 11,
name: 'Ronaldo'
},
{
id: 12,
name: 'Bale'
}
]
},
{
id: 6,
name: 'Barcelona',
children: [{
id: 13,
name: 'Messi'
},
{
id: 14,
name: 'Suarez'
}
]
},
]
}
],
categoryId: 7
}
}
})
.active {
background: yellow;
}
<script src="https://unpkg.com/vue"></script>
<div id="app">
<div>
<ul class="filter-category" v-for="list in categories">
<list-category :data="list" :category-id="categoryId"></list-category>
</ul>
</div>
</div>
<template id="lc">
<li>
<!--parent-->
<a v-if="isFolder" href="javascript:" @click="toggle">
<span class="fa fa-fw" :class="icon"></span> {{data.name}}
</a>
<!--if not folding, we do not need an binding event-->
<a v-else href="javascript:" :title="data.name" :class="{active: data.id === categoryId}"><span class="fa fa-fw fa-circle-o"></span> {{data.name}}</a>
<!--children-->
<ul v-if="isFolder" :class="isShow">
<list-category v-for="(data, index) in data.children" :key="index" :data="data" :search="search" :category-id="categoryId"></list-category>
</ul>
</li>
</template>
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![< img src =https://i.stack.imgur.com/0gmy9.pngalt =在此处输入图像说明>](\"https://i.stack.imgur.com/0gmy9.png\"){kind=link}