Element-UI快速入门

什么是Element UI

1. Element，一套为开发者、设计师和产品经理准备的基于 Vue 2.0 的桌面端组件库

1. Element UI是基于Vue 2.0的
2. Element UI 提供一组组件
3. Element UI 提供组件的参考实例, 直接复制

2. 官方网站：

​​https://element.eleme.cn/#/zh-CN/component/installation​​

搭建环境

创建项目

步骤一: 通过 vue-cli创建项目

vue create eui01

步骤二：运行项目

整合1：插件

安装好vue项目后，进入到项目目录，执行命令

vue add element

整合步骤1：确定引入方式（全部引入、按需引入）

整合

整合2：安装element-ui插件

npm i element-ui --save

整合：element-ui引入

1. 官方提供了2种引入方式：完整引入、按需引入

1. 完整引入：引入了eui所有的组件，学习时/开发时常用
2. 按需引入：引入需要的组件，生产环境下使用。

2. 完整引入

1. 1. 导入 element ui 组件库
2. 2. 导入 element ui css样式
3. 3. 并将element ui 注册给vue

/* 导入element-ui样式
*/
import 'element-ui/lib/theme-chalk/index.css'

import Vue from 'vue'
import App from './App.vue'
import router from './router'
import store from './store'

/* element-ui所有组件
*/
import ElementUI from 'element-ui'
Vue.use(ElementUI)

Vue.config.productionTip = false

new Vue({
  router,
  store,
  render: h => h(App)
}).$mount('#app')

3.布局容器

布局容器

1. 使用element-ui的布局容器(Container) 进行页面布局。对页面进行划分（上、下、左、中）
2. 官方文档 :​​https://element.eleme.cn/#/zh-CN/component/container​​

用于布局的容器组件，方便快速搭建页面的基本结构：

​​<el-container>​​​：外层容器。当子元素中包含 ​​<el-header>​​​ 或 ​​<el-footer>​​ 时，全部子元素会垂直上下排列，否则会水平左右排列。

​​<el-header>​​：顶栏容器。

​​<el-aside>​​：侧边栏容器。

​​<el-main>​​：主要区域容器。

​​<el-footer>​​：底栏容器。

以上组件采用了 flex 布局，使用前请确定目标浏览器是否兼容。此外，​​<el-container>​​​ 的子元素只能是后四者，后四者的父元素也只能是 ​​<el-container>​​。

步骤一: 修改src/main.js 导入 element-ui 样式和组件

/* 导入element-ui样式
*/
import 'element-ui/lib/theme-chalk/index.css'

import Vue from 'vue'
import App from './App.vue'
import router from './router'
import store from './store'

/* element-ui所有组件
*/
import ElementUI from 'element-ui'
Vue.use(ElementUI)

Vue.config.productionTip = false

new Vue({
  router,
  store,
  render: h => h(App)
}).$mount('#app')

步骤二: 删除 src/App.vue所有内容, 拷贝布局模板和样式

<template>
  <div id="app">
    <el-container>
      <el-header>Header</el-header>
      <el-main>Main</el-main>
      <el-footer>Footer</el-footer>
    </el-container>
  </div>
</template>

<script>
export default {

}
</script>

<style>
  /* 稍后删除 */
  .el-header, .el-footer {
    background-color: #B3C0D1;
    color: #333;
    text-align: center;
    line-height: 60px;
  }
</style>

reset.css

布局页面完成后, 整个body会存在一圈空白, 开发中一般选择重新设置页面样式

步骤一: 百度搜索”reset.css” , 并创建 assets/app.css ,拷贝样式 (复制下面样式即可)

body,div,dl,dt,dd,ul,ol,li,h1,h2,h3,h4,h5,h6,pre,form,fieldset,input,textarea,p,th,td {
    margin: 0;
    padding: 0;
}

table {
    border-collapse: collapse;
    border-spacing: 0;
}

fieldset,img {
    border: 0;
}

address,caption,cite,code,dfn,em,strong,th,var {
    font-style: normal;
    font-weight: normal;
}

ol,ul {
    list-style: none;
}

caption,th {
    text-align: left;
}

h1,h2,h3,h4,h5,h6 {
    font-size: 100%;
    font-weight: normal;

}

满屏填充

在App.vue中，添加样式

html, body, .el-container {
    height: 100%;
  }

4.导航条

需求

导航条

使用导航菜单(NavMenu) 完成导航条效果

官方文档 : ​​https://element.eleme.cn/#/zh-CN/component/menu​​

<template>
  <div id="app">
    <el-container>
      <el-header>
        <!-- 导航条 -->
        <el-menu
          :default-active="$route.path"
          class="el-menu-demo"
          mode="horizontal"
          background-color="#545c64"
          text-color="#fff"
          active-text-color="#ffd04b"
        >
          <el-menu-item index="/">首页</el-menu-item>
          <el-submenu index="2">
            <template slot="title">学生管理</template>
            <el-menu-item index="/studentList">学生列表</el-menu-item>
          </el-submenu>
          <el-submenu index="3">
            <template slot="title">个人中心</template>
            <el-menu-item index="/login">登录</el-menu-item>
            <el-menu-item index="/register">注册</el-menu-item>
          </el-submenu>
          <el-menu-item index="/cart">
           购物车
          </el-menu-item>
        </el-menu>
      </el-header>
      <el-main>
        <router-view></router-view>
      </el-main>
      <el-footer>
         版权所有 2006 - 2022 传智专修学院
      </el-footer>
    </el-container>
  </div>
</template>

<script>
export default {
}
</script>

<style>
  .el-header, .el-footer {
    background-color: #B3C0D1;
    color: #333;
    text-align: center;
    line-height: 60px;
    padding: 0;
  }
</style>

路由

点击”首页” 和 “购物车” 可以调整页面

步骤一: 修改 src/App.vue 设置路由视图

<template>
  <div id="app">
    <el-container>
      <el-header>
        <!-- 导航条 -->
        <el-menu
          class="el-menu-demo"
          mode="horizontal"
          background-color="#545c64"
          text-color="#fff"
          active-text-color="#ffd04b"
          :router="true"
        >
          <el-menu-item index="/">首页</el-menu-item>
          <el-submenu index="2">
            <template slot="title">学生管理</template>
            <el-menu-item index="/studentList">学生列表</el-menu-item>
          </el-submenu>
          <el-submenu index="3">
            <template slot="title">个人中心</template>
            <el-menu-item index="/login">登录</el-menu-item>
            <el-menu-item index="/register">注册</el-menu-item>
          </el-submenu>
          <el-menu-item index="/cart">
           购物车
          </el-menu-item>
        </el-menu>
      </el-header>
      <el-main>
        <router-view></router-view>
      </el-main>
      <el-footer>
         版权所有 2006 - 2020 传智专修学院
      </el-footer>
    </el-container>
  </div>
</template>

<script>
export default {
}
</script>

<style>
  .el-header, .el-footer {
    background-color: #B3C0D1;
    color: #333;
    text-align: center;
    line-height: 60px;
    padding: 0;
  }
</style>

步骤二: 编写测试组件（Home.vue和Cart.vue）

页面刷新导航选择问题

默认情况：点击后的默认效果

刷新页面, 导航条的选中状态消失

 修复: 修改 App.vue页面

<template>
  <div id="app">
    <el-container>
      <el-header>
        <!-- 导航条 -->
        <el-menu
          :default-active="$route.path"
          class="el-menu-demo"
          mode="horizontal"
          background-color="#545c64"
          text-color="#fff"
          active-text-color="#ffd04b"
          :router="true"
        >

页眉

<el-footer>
        版权所有 2006 - 2022 传智专修学院
</el-footer>

5.表格：查询列表

测试页面

基本表格

<template>
  <div>
    <!-- 列表 -->
    <el-table :data="studentList" >
      <el-table-column prop="sid" label="编号" width="150"></el-table-column>
      <el-table-column prop="sname" label="姓名" width="150"></el-table-column>
      <el-table-column prop="gender" label="性别" width="150"></el-table-column>
      <el-table-column prop="age" label="年龄" width="150"></el-table-column>
    </el-table>
  </div>
</template>

<script>
export default {
  data () {
    return {
      studentList: [
        {
          sid: 's001',
          sname: '张三',
          gender: '男',
          age: 18
        },
        {
          sid: 's002',
          sname: '李思',
          gender: '女',
          age: 21
        }
      ]
    }
  }
}
</script>

<style>

</style>

表格修饰

<template>
  <div>
    <!-- 列表 -->
    <el-table :data="studentList" stripe border >
      <el-table-column prop="sid" label="编号" width="150"></el-table-column>

多选

<template>
  <div>
    <!-- 列表 -->
    <el-table :data="studentList" stripe border @selection-change="handleSelectionChange">
      <el-table-column type="selection" width="55"></el-table-column>
      <el-table-column prop="sid" label="编号" width="150"></el-table-column>
      <el-table-column prop="sname" label="姓名" width="150"></el-table-column>
      <el-table-column prop="gender" label="性别" width="150"></el-table-column>
      <el-table-column prop="age" label="年龄" width="150"></el-table-column>
    </el-table>
  </div>
</template>

<script>
export default {
  methods: {
    handleSelectionChange(val) {
      this.multipleSelection = val;  //保存选中的数据
    }
  },
  data () {
    return {
      multipleSelection: [],  //多选，选中的数据
      studentList: [
        {
          sid: 's001',
          sname: '张三',
          gender: '男',
          age: 18
        },
        {
          sid: 's002',
          sname: '李思',
          gender: '女',
          age: 21
        }
      ]
    }
  }
}
</script>

<style>

</style>

自定义模板

<template>
  <div>
    <!-- 列表 -->
    <el-table :data="studentList" stripe border @selection-change="handleSelectionChange">
      <el-table-column type="selection" width="55"></el-table-column>
      <el-table-column prop="sid" label="编号" width="150"></el-table-column>
      <el-table-column prop="sname" label="姓名" width="150"></el-table-column>
      <el-table-column prop="gender" label="性别" width="150"></el-table-column>
      <el-table-column prop="age" label="年龄" width="150"></el-table-column>
      <el-table-column label="操作">
        <template slot-scope="scope">
          <el-button size="mini" @click="handleEdit(scope.$index, scope.row)">编辑</el-button>
          <el-button size="mini" type="danger" @click="handleDelete(scope.$index, scope.row)">删除</el-button>
        </template>
      </el-table-column>
    </el-table>
  </div>
</template>

<script>
export default {
  methods: {
    handleSelectionChange(val) {
      this.multipleSelection = val;  //保存选中的数据
    },
    handleEdit(index, row) {
      console.log(index, row);
    },
    handleDelete(index, row) {
      console.log(index, row);
    }
  },
  data () {
    return {
      multipleSelection: [],  //多选，选中的数据
      studentList: [
        {
          sid: 's001',
          sname: '张三',
          gender: '男',
          age: 18
        },
        {
          sid: 's002',
          sname: '李思',
          gender: '女',
          age: 21
        }
      ]
    }
  }
}
</script>

<style>

</style>

1. 练习：展示“爱好”信息

      studentList: [
        {
          sid: 's001',
          sname: '张三',
          gender: '男',
          age: 18,
          hobbies: ['抽烟','喝酒','烫头']
        },
        {
          sid: 's002',
          sname: '李思',
          gender: '女',
          age: 21,
          hobbies: ['抽烟','烫头']
        }
      ]

<template>
  <div>
    <!-- 列表 -->
    <el-table :data="studentList" stripe border @selection-change="handleSelectionChange">
      <el-table-column type="selection" width="55"></el-table-column>
      <el-table-column prop="sid" label="编号" width="150"></el-table-column>
      <el-table-column prop="sname" label="姓名" width="150"></el-table-column>
      <el-table-column prop="gender" label="性别" width="150"></el-table-column>
      <el-table-column prop="age" label="年龄" width="150"></el-table-column>
      <el-table-column label="爱好" >
        <template slot-scope="scope">
          <el-tag type="warning" v-for="(hobby,index) in scope.row.hobbies" :key="index">{{hobby}}</el-tag>
        </template>

      </el-table-column>
      <el-table-column label="操作">
        <template slot-scope="scope">
          <el-button size="mini" @click="handleEdit(scope.$index, scope.row)">编辑</el-button>
          <el-button size="mini" type="danger" @click="handleDelete(scope.$index, scope.row)">删除</el-button>
        </template>
      </el-table-column>
    </el-table>
  </div>
</template>

<script>
export default {
  methods: {
    handleSelectionChange(val) {
      this.multipleSelection = val;  //保存选中的数据
    },
    handleEdit(index, row) {
      console.log(index, row);
    },
    handleDelete(index, row) {
      console.log(index, row);
    }
  },
  data () {
    return {
      multipleSelection: [],  //多选，选中的数据
      studentList: [
        {
          sid: 's001',
          sname: '张三',
          gender: '男',
          age: 18,
          hobbies: ['抽烟','喝酒','烫头']
        },
        {
          sid: 's002',
          sname: '李思',
          gender: '女',
          age: 21,
          hobbies: ['抽烟','烫头']
        }
      ]
    }
  }
}
</script>

<style>
  .el-tag + .el-tag {
    margin-left: 10px;
  }
</style>

总结

条件查询

<!-- 条件表单 start -->
    <el-form :inline="true" :model="studentVo" size="mini" class="demo-form-inline">
      <el-form-item label="班级">
        <el-select v-model="studentVo.cid" placeholder="请选择班级">
          <el-option label="Java12班" value="c001"></el-option>
          <el-option label="Java34班" value="c002"></el-option>
        </el-select>
      </el-form-item>
      <el-form-item label="姓名">
        <el-input v-model="studentVo.name" placeholder="请输入姓名"></el-input>
      </el-form-item>
      <el-form-item label="年龄">
        <el-col :span="11">
          <el-input v-model="studentVo.startAge" placeholder="请输入开始年龄"></el-input>
        </el-col>
        <el-col class="line" :span="2">-</el-col>
        <el-col :span="11">
          <el-input v-model="studentVo.endAge" placeholder="请输入结束年龄"></el-input>
        </el-col>
      </el-form-item>

      <el-form-item>
        <el-button type="primary" @click="onSubmit">查询</el-button>
      </el-form-item>
    </el-form>
    <!-- 条件表单 end -->

分页条

    <!-- 分页条start -->
    <el-pagination
      @size-change="handleSizeChange"
      @current-change="handleCurrentChange"
      :current-page="pageInfo.pageNum"
      :page-sizes="[1, 2, 5, 10]"
      :page-size="pageInfo.pageSize"
      layout="total, sizes, prev, pager, next, jumper"
      :total="pageInfo.total">
    </el-pagination>
    <!-- 分页条end -->

 6.表单

简单表单：登录

显示登录页面：Login.vue

登录表单效果

<template>
  <el-card class="box-card">
    <el-form :model="user" label-width="80px" ref="loginFormRef">
      <el-form-item label="用户名">
        <el-input v-model="user.username" prefix-icon="el-icon-user" placeholder="请输入用户名"></el-input>
      </el-form-item>
      <el-form-item label="密码">
        <el-input v-model="user.password" prefix-icon="el-icon-lock" type="password" placeholder="请输入密码"></el-input>
      </el-form-item>
      <el-form-item>
        <el-button type="primary" @click="login">登录</el-button>
        <el-button type="info" @click="$refs.loginFormRef.resetFields()" >重置</el-button>
      </el-form-item>
    </el-form>
  </el-card>
</template>

<script>
export default {
  data() {
    return {
      user: {
        username: '',
        password: ''
      }
    }
  },
}
</script>

<style>
  .box-card {
    width: 480px;
  }
</style>

复杂表单：注册

<template>
  <el-card class="box-card">
    <el-form :model="user" label-width="80px" ref="loginFormRef">
      <el-form-item label="用户名">
        <el-input v-model="user.username" prefix-icon="el-icon-user" placeholder="请输入用户名"></el-input>
      </el-form-item>
      <el-form-item label="密码">
        <el-input v-model="user.password" prefix-icon="el-icon-lock" type="password" placeholder="请输入密码"></el-input>
      </el-form-item>
      <el-form-item label="确认密码">
        <el-input v-model="user.repassword" prefix-icon="el-icon-lock" type="password" placeholder="请再次输入密码"></el-input>
      </el-form-item>
      <el-form-item label="生日">
        <el-date-picker v-model="user.birthday" type="date" placeholder="选择日期">
    </el-date-picker>
      </el-form-item>
      <el-form-item label="学历">
        <el-select v-model="user.edu" placeholder="请选择你的学历">
          <el-option label="小班" value="xb"></el-option>
          <el-option label="中班" value="zb"></el-option>
          <el-option label="大班" value="db"></el-option>
          <el-option label="学前班" value="xqb"></el-option>
        </el-select>
      </el-form-item>
      <el-form-item label="性别">
        <el-radio-group v-model="user.gender">
          <el-radio label="男"></el-radio>
          <el-radio label="女"></el-radio>
        </el-radio-group>
      </el-form-item>
      <el-form-item label="爱好">
        <el-checkbox-group v-model="user.hobbies">
          <el-checkbox label="抽烟" name="type"></el-checkbox>
          <el-checkbox label="喝酒" name="type"></el-checkbox>
          <el-checkbox label="烫头" name="type"></el-checkbox>
          <el-checkbox label="蹦迪" name="type"></el-checkbox>
        </el-checkbox-group>
      </el-form-item>
      <el-form-item label="婚否">
        <el-switch v-model="user.marry"></el-switch>
      </el-form-item>
      <el-form-item label="省市县">
        <el-cascader
          v-model="user.city"
          :options="cityList"
          ></el-cascader>
      </el-form-item>
      <el-form-item>
        <el-button type="primary" @click="login">登录</el-button>
        <el-button type="info" @click="$refs.loginFormRef.resetFields()" >重置</el-button>
      </el-form-item>
    </el-form>
  </el-card>
</template>

<script>
export default {
  data() {
    return {
      user: {
        username: 'jack',
        password: '1234',
        repassword: '1234',
        birthday: '2020-10-07',
        edu: 'db',
        gender: '女',
        hobbies: ['抽烟','烫头'],
        marry: true,
        city: ['jiangsu', 'suqian', 'shuyang'],
      },
      cityList: [
        {
          value: 'jiangsu',
          label: '江苏',
          children: [
            {
              value: 'suqian',
              label: '宿迁',
              children: [
                {
                  value: 'shuyang',
                  label: '沭阳',
                },
                {
                  value: 'siyang',
                  label: '泗阳',
                }
              ]
            },
            {
              value: 'lianyungang',
              label: '连云港',
            }
          ]
        }
      ]

    }
  },
  methods: {
    login() {
      alert('登录中...')
    }
  },
}
</script>

<style>
  .box-card {
    width: 480px;
  }
</style>

表单校验

设置校验规则、确定校验属性

编写校验规则

rules: {
   校验属性: [  规则1,  规则2, .... ]
}

{ required: true, message: '请输入用户名', trigger: 'blur' },
{ min: 3, max: 5, message: `用户名长度必须3-5之间`, trigger: 'blur' }

提交表单时，校验

<template>
  <el-card class="box-card">
    <el-form :model="user" :rules="rules" label-width="80px" ref="loginFormRef">
      <el-form-item label="用户名" prop="username">
        <el-input v-model="user.username" prefix-icon="el-icon-user" placeholder="请输入用户名"></el-input>
      </el-form-item>
      <el-form-item label="密码" prop="password">
        <el-input v-model="user.password" prefix-icon="el-icon-lock" type="password" placeholder="请输入密码"></el-input>
      </el-form-item>
      <el-form-item>
        <el-button type="primary" @click="login">登录</el-button>
        <el-button type="info" @click="$refs.loginFormRef.resetFields()" >重置</el-button>
      </el-form-item>
    </el-form>
  </el-card>
</template>

<script>
export default {
  data() {
    return {
      user: {
        username: '',
        password: ''
      },
      rules: {
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 3, max: 5, message: `用户名长度必须3-5之间`, trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 3, max: 5, message: `密码长度必须3-5之间`, trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    login() {
      this.$refs.loginFormRef.validate(valid => {
        if(valid) {
          // 校验通过
          console.info('通过')
        } else {
          // 校验未通过
           console.info('未通过')
        }
      })
    }
  },
}
</script>

<style>
  .box-card {
    width: 480px;
  }
</style>

自定义校验

<template>
  <div>
    <h3>登录校验</h3>
    <el-card class="login-card">
      <!-- 登录表单start -->
      <el-form ref="loginForm" :model="user" :rules="rules" label-width="80px">
        <el-form-item label="用户名" prop="username">
          <el-input v-model="user.username" prefix-icon="el-icon-user" placeholder="请输入用户名" clearable></el-input>
        </el-form-item>
        <el-form-item label="密码" prop="password">
          <el-input v-model="user.password" prefix-icon="el-icon-lock" placeholder="请输入密码" show-password clearable></el-input>
        </el-form-item>
        <el-form-item label="确认密码" prop="repassword">
          <el-input v-model="user.repassword" prefix-icon="el-icon-lock" placeholder="请再次输入密码" show-password clearable></el-input>
        </el-form-item>
        <el-form-item>
          <el-button type="primary" @click="login()">登录</el-button>
          <el-button type="info">重置</el-button>
        </el-form-item>
      </el-form>
      <!-- 登录表单end -->
    </el-card>
  </div>
</template>

<script>
export default {
  data() {
    //校验： 密码和确认密码一致
    var validatePass2 = (rule, value, callback) => {
      if (value !== this.user.password) {
        callback(new Error('两次输入密码不一致!'));
      } else {
        callback();
      }
    };
    return {
      user: {
        username: '',
        password: '',
        repassword: ''
      },
      rules: {
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 3, max: 5, message: '用户名长度在 3 到 5 个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 3, max: 5, message: '密码长度在 3 到 5 个字符', trigger: 'blur' }
        ],
        repassword: [
          { required: true, message: '请再次输入密码', trigger: 'blur' },
          { validator: validatePass2, trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    login() {
      // js 对象调用有2种方式：this.user.username  或 this.user['username']
      this.$refs.loginForm.validate((valid) => {
        if (valid) {
          // 校验通过
          alert('submit!');
        } else {
          // 校验失败
          console.log('error submit!!');
          return false;
        }
      });
    }
  },
}
</script>

<style>
  .login-card{
    width: 480px;
  }
</style>

7.常见组件

按钮 Button

<template>
  <div>
    <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">危险按钮</el-button>
  </div>
</template>

<script>
export default {

}
</script>

<style>

</style>

消息提示 Message

this.$message.success('这是一条成功消息')
this.$message.error('这是一条错误消息')

<template>
  <div>
    <el-button type="info" @click="open1">消息</el-button>
    <el-button type="success" @click="open2">成功</el-button>
    <el-button type="warning" @click="open3">警告</el-button>
    <el-button type="danger" @click="open4">错误</el-button>
  </div>
</template>

<script>
export default {
  methods: {
    open1() {
      this.$message.info('这是一条提示信息')
    },
    open2() {
      this.$message.success('这是一条成功消息')
    },
    open3() {
      this.$message.warning('这是一条警告消息')
    },
    open4() {
      this.$message.error('这是一条错误消息')
    },
  },
}
</script>

<style>

</style>

弹出框 MessageBox 确认消息

 this.$confirm('这是提示信息','这是标题',{confirmButtonText: '确定按钮',cancelButtonText: '取消按钮',type: 'warning'})
      .then(()=>{
        // 确定按钮回调
        this.$message.success('删除了')
        // ajax操作
      })
      .catch(()=>{
        // 取消按钮回调
        this.$message.error('取消了')
      })

弹出框

编写弹出层

<template>
  <div>
    <el-button type="text" @click="dialogVisible = true">点击打开 Dialog</el-button>
    <!-- 弹出层 -->
    <el-dialog title="这是标题" :visible.sync="dialogVisible" >
      我是一段正文信息
      <!-- 操作按钮 -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="dialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="dialogVisible = false">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      dialogVisible: false,  //是否显示弹出层
    }
  },
}
</script>

<style>

</style>

抽屉

<template>
  <div>
    <el-button type="primary" @click="drawerFormVisible = true">修改学生</el-button>

    <!-- 抽屉start -->
    <el-drawer
      title="我是标题"
      :visible.sync="drawerFormVisible"
      direction="rtl"
      :before-close="handleClose">
      <el-form :model="student" label-width="80px">
        <el-form-item label="姓名" >
          <el-input v-model="student.sname" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="班级" >
          <el-select v-model="student.cid" placeholder="请选择班级">
            <el-option label="Java12班" value="c001"></el-option>
            <el-option label="Java34班" value="c002"></el-option>
          </el-select>
        </el-form-item>
        <el-form-item>
          <el-button type="primary" @click="drawerFormVisible=false">确定</el-button>
          <el-button>取消</el-button>
        </el-form-item>
      </el-form>
    </el-drawer>
    <!-- 抽屉end -->
  </div>
</template>

<script>
export default {
  data() {
    return {
      drawerFormVisible: false,
      student: {

      }
    }
  },
  methods: {
    handleClose(done) {
      this.$confirm('确认关闭？')
        .then(_ => {
          //确定按钮
          done();   //结束回调
        })
        .catch(_ => {
          //取消
        });
    }
  },
}
</script>

<style>
</style>

标签页

<template>
  <div>
    <el-tabs v-model="activeName" >
      <el-tab-pane label="用户管理" name="first">
        用户管理
        <el-button type="primary" @click="activeName = 'second'">下一步</el-button>
      </el-tab-pane>
      <el-tab-pane label="配置管理" name="second">
        配置管理
        <el-button type="primary" @click="activeName = 'third'">下一步</el-button>
      </el-tab-pane>
      <el-tab-pane label="角色管理" name="third">
        角色管理
        <el-button type="primary" @click="activeName = 'fourth'">下一步</el-button>
      </el-tab-pane>
      <el-tab-pane label="定时任务补偿" name="fourth">
        定时任务补偿
        <el-button type="primary" @click="$message.success('成功了')">完成</el-button>
      </el-tab-pane>
    </el-tabs>
  </div>
</template>

<script>
export default {
  data() {
    return {
      activeName: 'first'
    };
  }
}
</script>

<style>

</style>

 8.Tree组件

表结构

# 分类表
CREATE TABLE t_category(
  tid VARCHAR(32) PRIMARY KEY COMMENT '分类ID',
  tname VARCHAR(50) COMMENT '分类名称',
  `status` INT DEFAULT '1' COMMENT '分类状态：0 禁用、1 启用',
  parent_id VARCHAR(32) COMMENT '父分类ID',
  priority INT COMMENT '优先级，越小，同级显示的时候越靠前',
  depth INT COMMENT '深度，从1递增'
);

INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t1000','男装/运动户外', NULL ,1,1);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t2000','手机/数码', NULL ,2,1);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t3000','零食/生鲜', NULL ,3,1);

#'t1000','男装/运动户外'
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t1100','上装', 't1000' ,1,2);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t1200','裤子', 't1000' ,2,2);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t1300','流行趋势', 't1000' ,3,2);

INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t1110','羽绒服', 't1100' ,1,3);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t1120','棉衣', 't1100' ,2,3);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t1130','卫衣', 't1100' ,3,3);

INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t1210','休闲长裤', 't1200' ,1,3);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t1220','牛仔长裤', 't1200' ,2,3);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t1230','卫裤', 't1200' ,3,3);

INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t1310','伞兵裤', 't1300' ,1,3);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t1320','夜跑裤', 't1300' ,2,3);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t1330','冰感T恤', 't1300' ,3,3);

# 't2000','手机/数码'
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t2100','手机', 't2000' ,1,2);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t2200','手机配件', 't2000' ,2,2);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t2300','数码配件', 't2000' ,3,2);

INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t2110','华为手机', 't2100' ,1,3);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t2120','苹果手机', 't2100' ,2,3);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t2130','vivo手机', 't2100' ,3,3);

INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t2210','手机壳', 't2200' ,1,3);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t2220','手机耳机', 't2200' ,2,3);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t2230','手机支架', 't2200' ,3,3);

INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t2310','U盘', 't2300' ,1,3);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t2320','硬盘', 't2300' ,2,3);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t2330','电池', 't2300' ,3,3);

# t2000','零食/生鲜
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t3100','方便速食', 't3000' ,1,2);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t3200','零食', 't3000' ,2,2);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t3300','名酒', 't3000' ,3,2);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t3400','乳饮冰', 't3000' ,4,2);

INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t3110','方便面', 't3100' ,1,3);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t3120','火腿肠', 't3100' ,2,3);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t3130','甜品罐头', 't3100' ,3,3);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t3140','煎饼冷面', 't3100' ,4,3);

INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t3210','薯片', 't3200' ,1,3);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t3220','饼干', 't3200' ,2,3);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t3230','网红IP', 't3200' ,3,3);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t3240','海味', 't3200' ,4,3);

INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t3310','清爽啤酒', 't3300' ,1,3);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t3320','微醺红酒', 't3300' ,2,3);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t3330','养生黄酒', 't3300' ,3,3);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t3340','名优白酒', 't3300' ,4,3);

INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t3410','酸奶', 't3400' ,1,3);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t3420','纯牛奶', 't3400' ,2,3);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t3430','奶粉', 't3400' ,3,3);
INSERT INTO t_category(tid,tname,parent_id,priority,depth) VALUES('t3440','奶酪', 't3400' ,4,3);

后端实现

JavaBean

package com.czxy.entity;

import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import com.baomidou.mybatisplus.extension.activerecord.Model;
import lombok.Data;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;


@SuppressWarnings("serial")
@TableName("t_category")
@Data
public class TCategory extends Model<TCategory> {
    //分类ID
    @TableId
    private String tid;
    //分类名称
    private String tname;
    //分类状态：0 禁用、1 启用
    private Integer status;
    //父分类ID
    private String parentId;
    //优先级，越小，同级显示的时候越靠前
    private Integer priority;
    //深度，从1递增
    private Integer depth;

    @TableField(exist = false)
    private List<TCategory> children = new ArrayList<>();

}

Controller

package com.czxy.controller;


import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.api.ApiController;
import com.baomidou.mybatisplus.extension.api.R;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.czxy.entity.TCategory;
import com.czxy.service.TCategoryService;
import com.czxy.vo.BaseResult;
import org.springframework.web.bind.annotation.*;

import javax.annotation.Resource;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;


@RestController
@RequestMapping("tCategory")
public class TCategoryController extends ApiController {
    /**
     * 服务对象
     */
    @Resource
    private TCategoryService tCategoryService;

    @GetMapping
    public BaseResult<List<TCategory>> findAll() {
        // 1 查询所有，并按照parent_id排序
        QueryWrapper<TCategory> queryWrapper = new QueryWrapper<>();
        queryWrapper.orderByAsc("parent_id");
        List<TCategory> list = tCategoryService.list(queryWrapper);

        // 2 处理数据 父子关系
        List<TCategory> resultList = new ArrayList<>();
        Map<String,TCategory> cacheMap = new HashMap<>();

        list.forEach( tCategory -> {
            // 3.1 获得父分类
            TCategory parentCategory = cacheMap.get(tCategory.getParentId());
            // 3.2 如果没有父添加到resultList中，如果有父追加父内部
            if(parentCategory == null) {
                resultList.add(tCategory);
            } else {
                parentCategory.getChildren().add(tCategory);
            }

            // 3.3 缓存自己
            cacheMap.put(tCategory.getTid() , tCategory);

        });

        return BaseResult.ok("查询成功",resultList);
    }


}

前端基本实现

<template>
  <div>
    <el-tree
      :data="categoryList"
      :props="defaultProps"
      show-checkbox
      @check-change="handleCheckChange">
    </el-tree>
  </div>
</template>

<script>
export default {
  data() {
    return {
      categoryList: [],
      defaultProps: {
        children: 'children',
        label: 'tname',
        disabled: (data,node) => {
          return data.status == 0
        }
      }
    }
  },
  methods: {
    async findAllCategory() {
      let { data } = await this.$http.get('http://localhost:7777/tCategory')
      this.categoryList = data.data
    },
    handleCheckChange( data, checked, indeterminate ) {
      console.log(data, checked, indeterminate);
    }
  },
  mounted() {
    this.findAllCategory()
  },
}
</script>

<style>

</style>

修改状态

后端实现

@PutMapping("/change")
public BaseResult changeStatue(@RequestBody TCategory tCategory) {
    try {
        //1 查询
        TCategory findCategory = tCategoryService.getById(tCategory.getTid());
        Integer currentStatus = findCategory.getStatus();
        //2 需要修改成的状态
        Integer status = currentStatus == 1 ? 0 : 1;

        //3.1 修改当前
        Queue<TCategory> queue = new LinkedList<>();
        queue.add(findCategory);

        //3.2 遍历队列
        while(!queue.isEmpty()) {
            // 1) 获得队首
            TCategory currentCategory = queue.poll();
            // 2) 修改状态
            currentCategory.setStatus(status);
            tCategoryService.updateById(currentCategory);

            // 3) 获得所有的子节点
            QueryWrapper<TCategory> queryWrapper = new QueryWrapper<>();
            queryWrapper.eq("parent_id", currentCategory.getTid());
            List<TCategory> list = tCategoryService.list(queryWrapper);
            queue.addAll(list);
        }

        //4 成功
        return BaseResult.ok("修改成功");
    } catch (Exception e) {
        e.printStackTrace();
        return BaseResult.error(e.getMessage());
    }
}

前端实现

<template>
  <div>
    <el-tree
      :data="categoryList"
      :props="defaultProps"
      show-checkbox
      :expand-on-click-node="false"
      node-key="tid"
      :default-expanded-keys="expandedArr"
      @check-change="handleCheckChange">
      <span class="custom-tree-node" slot-scope="{ node, data }">
        <span>{{ node.label }}</span>
        <span>
          <el-button type="info" circle v-if="data.status == 1" size="mini" @click="() => changeCategoryStatus(data)">禁用</el-button>
          <el-button type="success" circle v-if="data.status == 0" size="mini" @click="() => changeCategoryStatus(data)">启用</el-button>
        </span>
      </span>
    </el-tree>
  </div>
</template>

<script>
export default {
  data() {
    return {
      categoryList: [],
      defaultProps: {
        id: 'tid',
        children: 'children',
        label: 'tname',
        disabled: (data,node) => {
          return data.status == 0
        }
      },
      expandedArr: []
    }
  },
  methods: {
    async findAllCategory() {
      let { data } = await this.$http.get('http://localhost:7777/tCategory')
      this.categoryList = data.data
    },
    handleCheckChange( data, checked, indeterminate ) {
      console.log(data, checked, indeterminate);
    },
    async changeCategoryStatus( nodeData ) {
      let { data } = await this.$http.put(`http://localhost:7777/tCategory/change`, nodeData)
      if(data.code == 1){
        this.$message.success(data.message)
        this.findAllCategory()
        //设置展开内容
        this.expandedArr = []
        this.expandedArr.push(nodeData.tid)
      } else {
        this.$message.error(data.message)
      }
    }
  },
  mounted() {
    this.findAllCategory()
  },
}
</script>

<style>
  .custom-tree-node {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 14px;
    padding-right: 8px;
  }
</style>

9.综合案例

弹出层回显学生信息

综合案例：点击学生“修改”按钮，显示弹出层

弹出层中编写表单

编写修改函数

<template>
  <div>
    <!-- 列表 -->
    <el-table :data="studentList" stripe border @selection-change="handleSelectionChange">
      <el-table-column type="selection" width="55"></el-table-column>
      <el-table-column prop="sid" label="编号" width="150"></el-table-column>
      <el-table-column prop="sname" label="姓名" width="150"></el-table-column>
      <el-table-column prop="gender" label="性别" width="150"></el-table-column>
      <el-table-column prop="age" label="年龄" width="150"></el-table-column>
      <el-table-column label="爱好" >
        <template slot-scope="scope">
          <el-tag type="warning" v-for="(hobby,index) in scope.row.hobbies" :key="index">{{hobby}}</el-tag>
        </template>

      </el-table-column>
      <el-table-column label="操作">
        <template slot-scope="scope">
          <el-button size="mini" @click="handleEdit(scope.$index, scope.row)">编辑</el-button>
          <el-button size="mini" type="danger" @click="handleDelete(scope.$index, scope.row)">删除</el-button>
        </template>
      </el-table-column>
    </el-table>

    <!-- 弹出层 -->
    <el-dialog title="修改学生" :visible.sync="dialogFormVisible">
      <el-form :model="student">
        <el-form-item label="姓名" label-width="80px">
          <el-input v-model="student.sname" ></el-input>
        </el-form-item>
        <el-form-item label="性别" label-width="80px">
          <el-radio-group v-model="student.gender">
            <el-radio label="男">男生</el-radio>
            <el-radio label="女">女生</el-radio>
          </el-radio-group>
        </el-form-item>
        <el-form-item label="年龄" label-width="80px">
          <el-input v-model="student.age" ></el-input>
        </el-form-item>
        <el-form-item label="爱好" label-width="80px">
          <el-checkbox-group v-model="student.hobbies">
            <el-checkbox label="抽烟" name="type"></el-checkbox>
            <el-checkbox label="喝酒" name="type"></el-checkbox>
            <el-checkbox label="烫头" name="type"></el-checkbox>
          </el-checkbox-group>
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogFormVisible = false">取 消</el-button>
        <el-button type="primary" @click="dialogFormVisible = false">确 定</el-button>
      </div>
    </el-dialog>
  </div>
</template>

<script>
export default {
  methods: {
    handleSelectionChange(val) {
      this.multipleSelection = val;  //保存选中的数据
    },
    handleEdit(index, row) {
      // 回显表单
      this.student = row
      // 显示弹出层
      this.dialogFormVisible = true
    },
    handleDelete(index, row) {
      console.log(index, row);
    }
  },
  data () {
    return {
      dialogFormVisible: false, // 表单弹出层是否显示
      multipleSelection: [],  //多选，选中的数据
      studentList: [
        {
          sid: 's001',
          sname: '张三',
          gender: '男',
          age: 18,
          hobbies: ['抽烟','喝酒','烫头']
        },
        {
          sid: 's002',
          sname: '李思',
          gender: '女',
          age: 21,
          hobbies: ['抽烟','烫头']
        }
      ],
      student: {

      }
    }
  }
}
</script>

<style>
  .el-tag + .el-tag {
    margin-left: 10px;
  }
</style>

 10.轮播图

轮播图

<template>
  <div>
    <el-carousel :interval="4000" type="card" height="300px">
      <el-carousel-item v-for="item in 6" :key="item">
        <img src="@/assets/logo.png" alt="">
      </el-carousel-item>
    </el-carousel>
  </div>
</template>

<script>
export default {

}
</script>

<style>
  .el-carousel__item img {
    width: 100%;
    height: 100%;
  }

  .el-carousel__item:nth-child(2n) {
    background-color: #99a9bf;
  }

  .el-carousel__item:nth-child(2n+1) {
    background-color: #d3dce6;
  }
</style>

 切换多张图片

<template>
  <div>
    <el-carousel :interval="1000" type="card" height="400px">
      <el-carousel-item v-for="item in 3" :key="item">
        <!-- <img src="@/assets/logo.png" alt="我是提示信息"> -->
        <!-- <img src="@/assets/img/1.jpg" alt="我是提示信息"> -->
        <img :src="require(`@/assets/img/${item}.jpg`)" alt="我是提示信息">
      </el-carousel-item>
    </el-carousel>
  </div>
</template>

<script>
export default {

}
</script>

<style>
  .el-carousel__item img {
    width: 100%;
    height: 100%;
  }

  /* 偶数的背景颜色 */
  .el-carousel__item:nth-child(2n) {
    background-color: #99a9bf;
  }

  /* 奇数的背景颜色 */
  .el-carousel__item:nth-child(2n+1) {
    background-color: #d3dce6;
  }
</style>

复杂下拉列表

 完整代码

<template>
  <div>
    <el-form ref="form" :model="classes" label-width="80px">
      <el-form-item label="选择老师">
        <el-select v-model="classes.teacherIds" @change="changeTeacher" multiple placeholder="请选择老师">
          <el-option
            v-for="(teacher,index) in teacherList" :key="index"
            :label="teacher.tname"
            :value="teacher.id"
            :disabled="teacher.disabled"
            
            >
            <span style="float: left">{{ teacher.tname }}</span>
            <span style="float: right;">{{ teacher.typeText }}</span>
          </el-option>
        </el-select>
      </el-form-item>
    </el-form>

    {{classes}}
  </div>
</template>

<script>
export default {
  data() {
    return {
      classes: {
        teacherIds: []
      },
      teacherList: [
        {
          id: 't001',
          tname: '梁桐老师',
          type: '1',
          typeText: '授课老师',
          disabled: false
        },
        {
          id: 't002',
          tname: '马坤老师',
          type: '2',
          typeText: '助理老师',
          disabled: false
        },
        {
          id: 't003',
          tname: '仲燕老师',
          type: '3',
          typeText: '辅导员老师',
          disabled: false
        },
        {
          id: 't004',
          tname: '韩小娇老师',
          type: '1',
          typeText: '授课老师',
          disabled: false
        },
        {
          id: 't005',
          tname: '董洪超老师',
          type: '2',
          typeText: '助理老师',
          disabled: false
        },
        {
          id: 't006',
          tname: '韩新园老师',
          type: '3',
          typeText: '辅导员老师',
          disabled: false
        },
        
      ]
    }
  },
  methods: {
    changeTeacher(selectIds) { // 选中的老师id
      // 1 获得选中老师对应的类型
      let selectType = this.teacherList.map(teacher => {
        if(selectIds.includes(teacher.id)) {
          return teacher.type
        }
      });

      // 2 处理数据：相同类型，不是选中老师，的其他老师禁用
      this.teacherList.forEach(teacher => {
        if(selectType.includes(teacher.type) && !selectIds.includes(teacher.id)) {
          // 禁用
          teacher.disabled = true
        } else {
          // 启用
          teacher.disabled = false
        }
      })
    }
  },
}
</script>

<style>

</style>