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How to imitate the select tag of Vue.js's ul-li tag

php中世界最好的语言Original: 2018-04-12 14:02:302858browse

This time I will show you how to imitate the select tag of the ul-li tag of Vue.js, and what are the precautions for selecting the ul-li tag of Vue.js. The following is a practical case, let's take a look.

Goal: Use the ul-li tag combined with Vue.js knowledge to create a drop-down option list that imitates the select tag.

Knowledge points:

How to write and use components

Data transfer between components (use of props)

Data transfer between components (use of $emit)

Dynamic data binding (v-bind)

Custom event communication

Rendering:

1. Before any operation is performed, the drop-down list is hidden

2. Click the input box to display the drop-down list

3. Click the list item, and the input box value will change accordingly

PS: In order to demonstrate the binding of two sets of data data1 and data2, two lists are created in the example

html code:

<!DOCTYPE html>
<html>
<head>
 <meta charset="UTF-8">
 <title>ul-li模仿select下拉菜单</title>
 <link rel="stylesheet" type="text/css" href="style.css" rel="external nofollow" />
 <script src="https://unpkg.com/vue/dist/vue.js"></script>
</head>
<body>
 <p id="demo">
  <my-select btn-name=&#39;search&#39; v-bind:list=&#39;data1&#39; style=&#39;float: left;margin-right: 2rem;&#39;></my-select>
  <my-select btn-name=&#39;搜索&#39; v-bind:list=&#39;data2&#39; style=&#39;float: left;&#39;></my-select>
 </p>
</body>
</html>

JavaScript code

<script type="text/javascript">
//注册全局组件
//在my-select组件中套用ul-select组件，my-select为父组件ul-select为子组件
Vue.component('my-select', {
 //组件中data要写成函数形式
 data() {
  return {
   ulShow: false, //默认ul不显示，单击input改变ul的显示状态
   selectVal: '' //选项值，input的值与选项值动态绑定
  }
 },
 //父组件向子组件通信用props
 props: ['btnName', 'list'],
 template: `
  <p id="selectWrap">
   <p class="searchBox">
    <input type="text" :value="selectVal" @click=&#39;ulShow = !ulShow&#39;/>
    <a href="#" rel="external nofollow" class="search" v-text=&#39;btnName&#39;></a>
   </p>
    <my-ul v-show=&#39;ulShow&#39; v-bind:list=&#39;list&#39; v-on:receive=&#39;changeVal&#39;></my-ul>
   </p>
 `,
 methods: {
  changeVal(value) {
   this.selectVal = value
  }
 }
})
//子组件
Vue.component('my-ul', {
 props: ['list'],
 template: `
  <ul class="skill">
   <li v-for=&#39;item of list&#39; v-on:click=&#39;selectLi(item)&#39;>{{item}}</li>
  </ul>
 `,
 methods: {
  selectLi: function(item) {
   //$emit触发当前实例上的自定义事件 receive
   this.$emit('receive', item);
  }
 }
})
//创建Vue实例
new Vue({
 el: '#demo',
 //定义两组数据分别传递到两个组件的li中，两个列表的操作互不影响
 data: {
  data1: ['CSS', 'HTML', 'JavaScript'],
  data2: ['Vue.js', 'Node.js', 'Sass'],
 }
})
</script>

CSS Style

ul, li {
 margin: 0;
 padding: 0;
 list-style: none;
}
#selectWrap {
 width: 250px;
 padding: 2rem;
 background: #4682b4;
}
.searchBox input, .searchBox a {
 line-height: 1.5rem;
 height: 1.5rem;
 margin-bottom: 1rem;
 padding: 0 5px;
 vertical-align: middle;
 border: 1px solid #aaa;
 border-radius: 5px;
 outline: none;
}
.searchBox a {
 display: inline-block;
 text-decoration: none;
 background-color: #b1d85c;
}
.skill li {
 font-size: 18px;
 line-height: 2rem;
 height: 2rem;
 padding-left: 5px;
 cursor: pointer;
}
.skill li:hover {
 background-color: #008b45;
}

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

How to imitate the select tag of Vue.js's ul-li tag

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