Java课题笔记~Element UI

Element：是饿了么公司前端开发团队提供的一套基于 Vue 的网站组件库，用于快速构建网页。

Element 提供了很多组件（组成网页的部件）供我们使用。例如超链接、按钮、图片、表格等等~

如下图左边的是我们编写页面看到的按钮，上图右边的是 Element 提供的页面效果，效果一目了然。

我们学习 Element 其实就是学习怎么从官网拷贝组件到我们自己的页面并进行修改，官网网址是

https://element.eleme.cn/#/zh-CNhttps://element.eleme.cn/#/zh-CN

进入官网能看到如下页面

2.1 快速入门

创建页面，并在页面引入Element 的css、js文件和 Vue.js

<!-- 引入vue -->
<script src="https://cdn.jsdelivr.net/npm/vue@2.7.14/dist/vue.js"></script>
<!-- 引入样式 -->
<link rel="stylesheet" href="https://unpkg.com/element-ui/lib/theme-chalk/index.css">
<!-- 引入组件库 -->
<script src="https://unpkg.com/element-ui/lib/index.js"></script>

2.创建Vue核心对象

Element 是基于 Vue 的，所以使用Element时必须要创建 Vue 对象

<script>new Vue({el:"#app"})
</script>

官网复制Element组件代码

在左菜单栏找到 Button 按钮 ，然后找到自己喜欢的按钮样式，点击 显示代码 ，在下面就会展示出对应的代码，将这些代码拷贝到我们自己的页面即可。

整体页面代码如下：

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Title</title>
</head>
<body>
<div id="app"><el-row><el-button>默认按钮</el-button><el-button type="primary">主要按钮</el-button><el-button type="success">成功按钮</el-button><el-button type="info">信息按钮</el-button><el-button type="warning">警告按钮</el-button><el-button type="danger">删除</el-button></el-row><el-row><el-button plain>朴素按钮</el-button><el-button type="primary" plain>主要按钮</el-button><el-button type="success" plain>成功按钮</el-button><el-button type="info" plain>信息按钮</el-button><el-button type="warning" plain>警告按钮</el-button><el-button type="danger" plain>危险按钮</el-button></el-row><el-row><el-button round>圆角按钮</el-button><el-button type="primary" round>主要按钮</el-button><el-button type="success" round>成功按钮</el-button><el-button type="info" round>信息按钮</el-button><el-button type="warning" round>警告按钮</el-button><el-button type="danger" round>危险按钮</el-button></el-row><el-row><el-button icon="el-icon-search" circle></el-button><el-button type="primary" icon="el-icon-edit" circle></el-button><el-button type="success" icon="el-icon-check" circle></el-button><el-button type="info" icon="el-icon-message" circle></el-button><el-button type="warning" icon="el-icon-star-off" circle></el-button><el-button type="danger" icon="el-icon-delete" circle></el-button></el-row>
</div><!-- 引入vue -->
<script src="https://cdn.jsdelivr.net/npm/vue@2.7.14/dist/vue.js"></script>
<!-- 引入样式 -->
<link rel="stylesheet" href="https://unpkg.com/element-ui/lib/theme-chalk/index.css">
<!-- 引入组件库 -->
<script src="https://unpkg.com/element-ui/lib/index.js"></script><script>new Vue({el:"#app"})
</script></body>
</html>

浏览器页面显示效果如下：

2.2 Element 布局

Element 提供了两种布局方式，分别是：

Layout 布局
Container 布局容器

2.2.1 Layout 布局

通过基础的 24 分栏，迅速简便地创建布局。也就是默认将一行分为 24 栏，根据页面要求给每一列设置所占的栏数。

在左菜单栏找到 Layout 布局 ，然后找到自己喜欢的按钮样式，点击 显示代码 ，在下面就会展示出对应的代码，显示出的代码中有样式，有html标签。将样式拷贝我们自己页面的 head 标签内，将html标签拷贝到 <div id="app"></div> 标签内。

整体页面代码如下：

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Title</title><style>.el-row {margin-bottom: 20px;}.el-col {border-radius: 4px;}.bg-purple-dark {background: #99a9bf;}.bg-purple {background: #d3dce6;}.bg-purple-light {background: #e5e9f2;}.grid-content {border-radius: 4px;min-height: 36px;}.row-bg {padding: 10px 0;background-color: #f9fafc;}</style>
</head>
<body>
<div id="app"><el-row><el-col :span="24"><div class="grid-content bg-purple-dark"></div></el-col></el-row><el-row><el-col :span="12"><div class="grid-content bg-purple"></div></el-col><el-col :span="12"><div class="grid-content bg-purple-light"></div></el-col></el-row><el-row><el-col :span="8"><div class="grid-content bg-purple"></div></el-col><el-col :span="8"><div class="grid-content bg-purple-light"></div></el-col><el-col :span="8"><div class="grid-content bg-purple"></div></el-col></el-row><el-row><el-col :span="6"><div class="grid-content bg-purple"></div></el-col><el-col :span="6"><div class="grid-content bg-purple-light"></div></el-col><el-col :span="6"><div class="grid-content bg-purple"></div></el-col><el-col :span="6"><div class="grid-content bg-purple-light"></div></el-col></el-row><el-row><el-col :span="4"><div class="grid-content bg-purple"></div></el-col><el-col :span="4"><div class="grid-content bg-purple-light"></div></el-col><el-col :span="4"><div class="grid-content bg-purple"></div></el-col><el-col :span="4"><div class="grid-content bg-purple-light"></div></el-col><el-col :span="4"><div class="grid-content bg-purple"></div></el-col><el-col :span="4"><div class="grid-content bg-purple-light"></div></el-col></el-row>
</div>
<script src="js/vue.js"></script>
<script src="element-ui/lib/index.js"></script>
<link rel="stylesheet" href="element-ui/lib/theme-chalk/index.css"><script>new Vue({el:"#app"})
</script>
</body>
</html>

通过浏览器打开该页面可以看到如下页面：

现在需要添加一行，要求该行显示8个格子，通过计算每个格子占 3 栏，具体的html 代码如下

<!--
添加一行，8个格子  24/8 = 3
-->
<el-row><el-col :span="3"><div class="grid-content bg-purple"></div></el-col><el-col :span="3"><div class="grid-content bg-purple-light"></div></el-col><el-col :span="3"><div class="grid-content bg-purple"></div></el-col><el-col :span="3"><div class="grid-content bg-purple-light"></div></el-col><el-col :span="3"><div class="grid-content bg-purple"></div></el-col><el-col :span="3"><div class="grid-content bg-purple-light"></div></el-col><el-col :span="3"><div class="grid-content bg-purple"></div></el-col><el-col :span="3"><div class="grid-content bg-purple-light"></div></el-col>
</el-row>

通过浏览器打开该页面可以看到如下页面：

2.2.2 Container 布局容器

用于布局的容器组件，方便快速搭建页面的基本结构。如下图就是布局容器效果。

如下图是官网提供的 Container 布局容器实例：

该效果代码中包含了样式、页面标签、模型数据。将里面的样式 <style> 拷贝到我们自己页面的 head 标签中；将html标签拷贝到 <div id="app"></div> 标签中，再将数据模型拷贝到 vue 对象的 data() 中。

整体页面代码如下：

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Title</title><style>.el-header {background-color: #B3C0D1;color: #333;line-height: 60px;}.el-aside {color: #333;}</style>
</head>
<body>
<div id="app"><el-container style="height: 500px; border: 1px solid #eee"><el-aside width="200px" style="background-color: rgb(238, 241, 246)"><el-menu :default-openeds="['1', '3']"><el-submenu index="1"><template slot="title"><i class="el-icon-message"></i>导航一</template><el-menu-item-group><template slot="title">分组一</template><el-menu-item index="1-1">选项1</el-menu-item><el-menu-item index="1-2">选项2</el-menu-item></el-menu-item-group><el-menu-item-group title="分组2"><el-menu-item index="1-3">选项3</el-menu-item></el-menu-item-group><el-submenu index="1-4"><template slot="title">选项4</template><el-menu-item index="1-4-1">选项4-1</el-menu-item></el-submenu></el-submenu><el-submenu index="2"><template slot="title"><i class="el-icon-menu"></i>导航二</template><el-submenu index="2-1"><template slot="title">选项1</template><el-menu-item index="2-1-1">选项1-1</el-menu-item></el-submenu></el-submenu><el-submenu index="3"><template slot="title"><i class="el-icon-setting"></i>导航三</template><el-menu-item-group><template slot="title">分组一</template><el-menu-item index="3-1">选项1</el-menu-item><el-menu-item index="3-2">选项2</el-menu-item></el-menu-item-group><el-menu-item-group title="分组2"><el-menu-item index="3-3">选项3</el-menu-item></el-menu-item-group><el-submenu index="3-4"><template slot="title">选项4</template><el-menu-item index="3-4-1">选项4-1</el-menu-item></el-submenu></el-submenu></el-menu></el-aside><el-container><el-header style="text-align: right; font-size: 12px"><el-dropdown><i class="el-icon-setting" style="margin-right: 15px"></i><el-dropdown-menu slot="dropdown"><el-dropdown-item>查看</el-dropdown-item><el-dropdown-item>新增</el-dropdown-item><el-dropdown-item>删除</el-dropdown-item></el-dropdown-menu></el-dropdown><span>王小虎</span></el-header><el-main><el-table :data="tableData"><el-table-column prop="date" label="日期" width="140"></el-table-column><el-table-column prop="name" label="姓名" width="120"></el-table-column><el-table-column prop="address" label="地址"></el-table-column></el-table></el-main></el-container></el-container>
</div>
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Title</title>
</head>
<body>
<div id="app"><el-row><el-button>默认按钮</el-button><el-button type="primary">主要按钮</el-button><el-button type="success">成功按钮</el-button><el-button type="info">信息按钮</el-button><el-button type="warning">警告按钮</el-button><el-button type="danger">删除</el-button></el-row><el-row><el-button plain>朴素按钮</el-button><el-button type="primary" plain>主要按钮</el-button><el-button type="success" plain>成功按钮</el-button><el-button type="info" plain>信息按钮</el-button><el-button type="warning" plain>警告按钮</el-button><el-button type="danger" plain>危险按钮</el-button></el-row><el-row><el-button round>圆角按钮</el-button><el-button type="primary" round>主要按钮</el-button><el-button type="success" round>成功按钮</el-button><el-button type="info" round>信息按钮</el-button><el-button type="warning" round>警告按钮</el-button><el-button type="danger" round>危险按钮</el-button></el-row><el-row><el-button icon="el-icon-search" circle></el-button><el-button type="primary" icon="el-icon-edit" circle></el-button><el-button type="success" icon="el-icon-check" circle></el-button><el-button type="info" icon="el-icon-message" circle></el-button><el-button type="warning" icon="el-icon-star-off" circle></el-button><el-button type="danger" icon="el-icon-delete" circle></el-button></el-row>
</div><!-- 引入vue -->
<script src="https://cdn.jsdelivr.net/npm/vue@2.7.14/dist/vue.js"></script>
<!-- 引入样式 -->
<link rel="stylesheet" href="https://unpkg.com/element-ui/lib/theme-chalk/index.css">
<!-- 引入组件库 -->
<script src="https://unpkg.com/element-ui/lib/index.js"></script><script>new Vue({el:"#app"})
</script></body>
</html><script>new Vue({el:"#app",data() {const item = {date: '2016-05-02',name: '王小虎',address: '上海市普陀区金沙江路 1518 弄'};return {tableData: Array(20).fill(item)}}})
</script>
</body>
</html>

通过浏览器打开该页面可以看到如下页面：