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How to implement select drop-down list through Vue.js, the specific operations are as follows

亚连Original: 2018-06-01 17:02:582212browse

Below I will share with you an example of making a select drop-down list in Vue.js (ul-li tag imitates the select tag), which has a good reference value and I hope it will be helpful to everyone.

Goal: Use the ul-li tag combined with Vue.js knowledge to make 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 value of the input box changes 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(&#39;my-select&#39;, {
 //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: &#39;&#39; //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: [&#39;btnName&#39;, &#39;list&#39;],
 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(&#39;my-ul&#39;, {
 props: [&#39;list&#39;],
 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(&#39;receive&#39;, item);
  }
 }
})
//创建Vue实例
new Vue({
 el: &#39;#demo&#39;,
 //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: [&#39;CSS&#39;, &#39;HTML&#39;, &#39;JavaScript&#39;],
  data2: [&#39;Vue.js&#39;, &#39;Node.js&#39;, &#39;Sass&#39;],
 }
})
</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;
}

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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