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vue实现留言板todolist功能

时间：2021-09-02 10:07:27 | 栏目：vue | 点击：次

通过前面两篇文章的的学习，我们掌握了vue的基本用法. 本文，就利用这些基础知识来实现一个留言板， 老外把他称之为todolist.

第一步、使用bootstrap做好布局

<!DOCTYPE html>
<html>
<head lang="en">
  <meta charset="UTF-8">
  <title></title>
  <link rel="stylesheet" href="lib/bootstrap.min.css"/>
  <script src="lib/jquery-1.7.2.js"></script>
  <script src="lib/bootstrap.js"></script>
</head>
<body>
<div class="container">
  <form role="form">
    <div class="form-group">
      <label for="username">用户名:</label>
      <input type="text" id="username" class="form-control" placeholder="输入用户名">
    </div>
    <div class="form-group">
      <label for="age">年　龄:</label>
      <input type="text" id="age" class="form-control" placeholder="输入年龄">
    </div>
    <div class="form-group">
      <input type="button" value="添加" class="btn btn-primary">
      <input type="button" value="重置" class="btn btn-danger">
    </div>
  </form>
  <hr>
  <table class="table table-bordered table-hover">
    <caption class="h2 text-info">用户信息表</caption>
    <tr class="text-danger">
      <th class="text-center">序号</th>
      <th class="text-center">名字</th>
      <th class="text-center">年龄</th>
      <th class="text-center">操作</th>
    </tr>
    <tr class="text-center">
      <td>1</td>
      <td>张三</td>
      <td>20</td>
      <td>
        <button class="btn btn-primary btn-sm">删除</button>
      </td>
    </tr>
    <tr class="text-center">
      <td>2</td>
      <td>李四</td>
      <td>22</td>
      <td>
        <button class="btn btn-primary btn-sm">删除</button>
      </td>
    </tr>
    <tr>
      <td colspan="4" class="text-right">
        <button class="btn btn-danger btn-sm">删除全部</button>
      </td>
    </tr>
    <tr>
      <td colspan="4" class="text-center text-muted">
        <p>暂无数据....</p>
      </td>
    </tr>
  </table>
</div>
</body>
</html>

第二步、增加模态框，模态框默认为隐藏的

<!DOCTYPE html>
<html>
<head lang="en">
  <meta charset="UTF-8">
  <title></title>
  <link rel="stylesheet" href="lib/bootstrap.min.css"/>
  <script src="lib/jquery-1.7.2.js"></script>
  <script src="lib/bootstrap.js"></script>
</head>
<body>
<div class="container">
  <form role="form">
    <div class="form-group">
      <label for="username">用户名:</label>
      <input type="text" id="username" class="form-control" placeholder="输入用户名">
    </div>
    <div class="form-group">
      <label for="age">年　龄:</label>
      <input type="text" id="age" class="form-control" placeholder="输入年龄">
    </div>
    <div class="form-group">
      <input type="button" value="添加" class="btn btn-primary">
      <input type="button" value="重置" class="btn btn-danger">
    </div>
  </form>
  <hr>
  <table class="table table-bordered table-hover">
    <caption class="h2 text-info">用户信息表</caption>
    <tr class="text-danger">
      <th class="text-center">序号</th>
      <th class="text-center">名字</th>
      <th class="text-center">年龄</th>
      <th class="text-center">操作</th>
    </tr>
    <tr class="text-center">
      <td>1</td>
      <td>张三</td>
      <td>20</td>
      <td>
        <button class="btn btn-primary btn-sm" data-toggle="modal" data-target="#layer">删除</button>
      </td>
    </tr>
    <tr class="text-center">
      <td>2</td>
      <td>李四</td>
      <td>22</td>
      <td>
        <button class="btn btn-primary btn-sm" data-toggle="modal" data-target="#layer">删除</button>
      </td>
    </tr>
    <tr>
      <td colspan="4" class="text-right">
        <button class="btn btn-danger btn-sm">删除全部</button>
      </td>
    </tr>
    <tr>
      <td colspan="4" class="text-center text-muted">
        <p>暂无数据....</p>
      </td>
    </tr>
  </table>

  <!--模态框 弹出框-->
  <div role="dialog" class="modal fade bs-example-modal-sm" id="layer">
    <div class="modal-dialog">
      <div class="modal-content">
        <div class="modal-header">
          <button type="button" class="close" data-dismiss="modal">
            <span>&times;</span>
          </button>
          <h4 class="modal-title">确认删除么?</h4>
        </div>
        <div class="modal-body text-right">
          <button data-dismiss="modal" class="btn btn-primary btn-sm">取消</button>
          <button data-dismiss="modal" class="btn btn-danger btn-sm">确认</button>
        </div>
      </div>
    </div>
  </div>


</div>
</body>
</html>

第三步、定义userList用来保存用户，userName保存用户名, age保存用户变量，  然后把userName和age 通过 v-model指令绑定到对应的输入框，实现输入框与变量中的数据双向驱动，在表格的行中输出userList

<!DOCTYPE html>
<html>
<head lang="en">
  <meta charset="UTF-8">
  <title></title>
  <link rel="stylesheet" href="lib/bootstrap.min.css"/>
  <script src="lib/jquery-1.7.2.js"></script>
  <script src="lib/bootstrap.js"></script>
  <script src="../js/vue.js"></script>
  <script>
    window.onload = function () {
      var c = new Vue({
        el: '#box',
        data: {
          userList: [],
          userName : '',
          age : ''
        }
      });
    }
  </script>
</head>
<body>
<div class="container" id="box">
  <form role="form">
    <div class="form-group">
      <label for="username">用户名:</label>
      <input type="text" id="username" v-model="userName" class="form-control" placeholder="输入用户名">
    </div>
    <div class="form-group">
      <label for="age">年　龄:</label>
      <input type="text" id="age" v-model="age" class="form-control" placeholder="输入年龄">
    </div>
    <div class="form-group">
      <input type="button" value="添加" class="btn btn-primary">
      <input type="button" value="重置" class="btn btn-danger">
    </div>
  </form>
  <hr>
  <table class="table table-bordered table-hover">
    <caption class="h2 text-info">用户信息表</caption>
    <tr class="text-danger">
      <th class="text-center">序号</th>
      <th class="text-center">名字</th>
      <th class="text-center">年龄</th>
      <th class="text-center">操作</th>
    </tr>
    <tr class="text-center" v-for="value in userList">
      <td>{{$index+1}}</td>
      <td>{{value.name}}</td>
      <td>{{value.age}}</td>
      <td>
        <button class="btn btn-primary btn-sm" data-toggle="modal" data-target="#layer">删除</button>
      </td>
    </tr>
    <tr>
      <td colspan="4" class="text-right">
        <button class="btn btn-danger btn-sm">删除全部</button>
      </td>
    </tr>
    <tr>
      <td colspan="4" class="text-center text-muted">
        <p>暂无数据....</p>
      </td>
    </tr>
  </table>

  <!--模态框 弹出框-->
  <div role="dialog" class="modal fade bs-example-modal-sm" id="layer">
    <div class="modal-dialog">
      <div class="modal-content">
        <div class="modal-header">
          <button type="button" class="close" data-dismiss="modal">
            <span>&times;</span>
          </button>
          <h4 class="modal-title">确认删除么?</h4>
        </div>
        <div class="modal-body text-right">
          <button data-dismiss="modal" class="btn btn-primary btn-sm">取消</button>
          <button data-dismiss="modal" class="btn btn-danger btn-sm">确认</button>
        </div>
      </div>
    </div>
  </div>
</div>
</body>
</html>

第四步、添加用户，点击添加按钮，把输入框中的数据作为一个对象 push 到数组userList，添加完之后，把userName, age清空，那么两个输入框的内容就会被清空

<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<link rel="stylesheet" href="lib/bootstrap.min.css"/>
<script src="lib/jquery-1.7.2.js"></script>
<script src="lib/bootstrap.js"></script>
<script src="../js/vue.js"></script>
<script>
window.onload = function () {
var c = new Vue({
el: '#box',
data: {
userList: [],
userName : '',
age : ''
}
});
}
</script>
</head>
<body>
<div class="container" id="box">
<form role="form">
<div class="form-group">
<label for="username">用户名:</label>
<input type="text" id="username" v-model="userName" class="form-control" placeholder="输入用户名">
</div>
<div class="form-group">
<label for="age">年　龄:</label>
<input type="text" id="age" v-model="age" class="form-control" placeholder="输入年龄">
</div>
<div class="form-group">
<input type="button" value="添加" class="btn btn-primary">
<input type="button" value="重置" class="btn btn-danger">
</div>
</form>
<hr>
<table class="table table-bordered table-hover">
<caption class="h2 text-info">用户信息表</caption>
<tr class="text-danger">
<th class="text-center">序号</th>
<th class="text-center">名字</th>
<th class="text-center">年龄</th>
<th class="text-center">操作</th>
</tr>
<tr class="text-center" v-for="value in userList">
<td>{{$index+1}}</td>
<td>{{value.name}}</td>
<td>{{value.age}}</td>
<td>
<button class="btn btn-primary btn-sm" data-toggle="modal" data-target="#layer">删除</button>
</td>
</tr>
<tr>
<td colspan="4" class="text-right">
<button class="btn btn-danger btn-sm">删除全部</button>
</td>
</tr>
<tr>
<td colspan="4" class="text-center text-muted">
<p>暂无数据....</p>
</td>
</tr>
</table>

<!--模态框 弹出框-->
<div role="dialog" class="modal fade bs-example-modal-sm" id="layer">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal">
<span>&times;</span>
</button>
<h4 class="modal-title">确认删除么?</h4>
</div>
<div class="modal-body text-right">
<button data-dismiss="modal" class="btn btn-primary btn-sm">取消</button>
<button data-dismiss="modal" class="btn btn-danger btn-sm">确认</button>
</div>
</div>
</div>
</div>
</div>
</body>
</html>

第五步、结合数组的长度与v-show指令，实现提示信息的显示与隐藏

<!DOCTYPE html>
<html>
<head lang="en">
  <meta charset="UTF-8">
  <title></title>
  <link rel="stylesheet" href="lib/bootstrap.min.css"/>
  <script src="lib/jquery-1.7.2.js"></script>
  <script src="lib/bootstrap.js"></script>
  <script src="../js/vue.js"></script>
  <script>
    window.onload = function () {
      var c = new Vue({
        el: '#box',
        data: {
          userList: [],
          userName : '',
          age : ''
        },
        methods : {
          addUser : function(){
            this.userList.push({
              name : this.userName,
              age : this.age
            });

            this.userName = ''; //添加完用户之后，把输入框的值清除
            this.age = '';
          }
        }
      });
    }
  </script>
</head>
<body>
<div class="container" id="box">
  <form role="form">
    <div class="form-group">
      <label for="username">用户名:</label>
      <input type="text" id="username" v-model="userName" class="form-control" placeholder="输入用户名">
    </div>
    <div class="form-group">
      <label for="age">年　龄:</label>
      <input type="text" id="age" v-model="age" class="form-control" placeholder="输入年龄">
    </div>
    <div class="form-group">
      <input type="button" v-on:click="addUser();" value="添加" class="btn btn-primary">
      <input type="button" value="重置" class="btn btn-danger">
    </div>
  </form>
  <hr>
  <table class="table table-bordered table-hover">
    <caption class="h2 text-info">用户信息表</caption>
    <tr class="text-danger">
      <th class="text-center">序号</th>
      <th class="text-center">名字</th>
      <th class="text-center">年龄</th>
      <th class="text-center">操作</th>
    </tr>
    <tr class="text-center" v-for="value in userList">
      <td>{{$index+1}}</td>
      <td>{{value.name}}</td>
      <td>{{value.age}}</td>
      <td>
        <button class="btn btn-primary btn-sm" data-toggle="modal" data-target="#layer">删除</button>
      </td>
    </tr>
    <tr v-show="userList.length!=0">
      <td colspan="4" class="text-right">
        <button class="btn btn-danger btn-sm">删除全部</button>
      </td>
    </tr>
    <tr v-show="userList.length==0">
      <td colspan="4" class="text-center text-muted">
        <p>暂无数据....</p>
      </td>
    </tr>
  </table>

  <!--模态框 弹出框-->
  <div role="dialog" class="modal fade bs-example-modal-sm" id="layer">
    <div class="modal-dialog">
      <div class="modal-content">
        <div class="modal-header">
          <button type="button" class="close" data-dismiss="modal">
            <span>&times;</span>
          </button>
          <h4 class="modal-title">确认删除么?</h4>
        </div>
        <div class="modal-body text-right">
          <button data-dismiss="modal" class="btn btn-primary btn-sm">取消</button>
          <button data-dismiss="modal" class="btn btn-danger btn-sm">确认</button>
        </div>
      </div>
    </div>
  </div>
</div>
</body>
</html>

第六步、实现删除某行数据

<!DOCTYPE html>
<html>
<head lang="en">
  <meta charset="UTF-8">
  <title></title>
  <link rel="stylesheet" href="lib/bootstrap.min.css"/>
  <script src="lib/jquery-1.7.2.js"></script>
  <script src="lib/bootstrap.js"></script>
  <script src="../js/vue.js"></script>
  <script>
    window.onload = function () {
      var c = new Vue({
        el: '#box',
        data: {
          userList: [],
          userName : '',
          age : '',
          curIndex : -10
        },
        methods : {
          addUser : function(){
            this.userList.push({
              name : this.userName,
              age : this.age
            });

            this.userName = ''; //添加完用户之后，把输入框的值清除
            this.age = '';
          },
          deleteRow : function( n ){
            this.userList.splice( n, 1 );
          }
        }
      });
    }
  </script>
</head>
<body>
<div class="container" id="box">
  <form role="form">
    <div class="form-group">
      <label for="username">用户名:</label>
      <input type="text" id="username" v-model="userName" class="form-control" placeholder="输入用户名">
    </div>
    <div class="form-group">
      <label for="age">年　龄:</label>
      <input type="text" id="age" v-model="age" class="form-control" placeholder="输入年龄">
    </div>
    <div class="form-group">
      <input type="button" v-on:click="addUser();" value="添加" class="btn btn-primary">
      <input type="button" value="重置" class="btn btn-danger">
    </div>
  </form>
  <hr>
  <table class="table table-bordered table-hover">
    <caption class="h2 text-info">用户信息表</caption>
    <tr class="text-danger">
      <th class="text-center">序号</th>
      <th class="text-center">名字</th>
      <th class="text-center">年龄</th>
      <th class="text-center">操作</th>
    </tr>
    <tr class="text-center" v-for="value in userList">
      <td>{{$index+1}}</td>
      <td>{{value.name}}</td>
      <td>{{value.age}}</td>
      <td>
        <button class="btn btn-primary btn-sm" data-toggle="modal" data-target="#layer" v-on:click="curIndex=$index">删除</button>
      </td>
    </tr>
    <tr v-show="userList.length!=0">
      <td colspan="4" class="text-right">
        <button class="btn btn-danger btn-sm">删除全部</button>
      </td>
    </tr>
    <tr v-show="userList.length==0">
      <td colspan="4" class="text-center text-muted">
        <p>暂无数据....</p>
      </td>
    </tr>
  </table>

  <!--模态框 弹出框-->
  <div role="dialog" class="modal fade bs-example-modal-sm" id="layer">
    <div class="modal-dialog">
      <div class="modal-content">
        <div class="modal-header">
          <button type="button" class="close" data-dismiss="modal">
            <span>&times;</span>
          </button>
          <h4 class="modal-title">确认删除么?</h4>
        </div>
        <div class="modal-body text-right">
          <button data-dismiss="modal" class="btn btn-primary btn-sm">取消</button>
          <button data-dismiss="modal" class="btn btn-danger btn-sm" v-on:click="deleteRow(curIndex);">确认</button>
        </div>
      </div>
    </div>
  </div>
</div>
</body>
</html>

第七步、实现删除全部行

<!DOCTYPE html>
<html>
<head lang="en">
  <meta charset="UTF-8">
  <title></title>
  <link rel="stylesheet" href="lib/bootstrap.min.css"/>
  <script src="lib/jquery-1.7.2.js"></script>
  <script src="lib/bootstrap.js"></script>
  <script src="../js/vue.js"></script>
  <script>
    window.onload = function () {
      var c = new Vue({
        el: '#box',
        data: {
          userList: [],
          userName: '',
          age: '',
          curIndex: -10
        },
        methods: {
          addUser: function () {
            this.userList.push({
              name: this.userName,
              age: this.age
            });

            this.userName = ''; //添加完用户之后，把输入框的值清除
            this.age = '';
          },
          deleteRow: function (n) {
            if (n == -1) { //当n=-1的时候,清空数组，就是删除全部
              this.userList = [];
            } else {
              this.userList.splice(n, 1);
            }
          }
        }
      });
    }
  </script>
</head>
<body>
<div class="container" id="box">
  <form role="form">
    <div class="form-group">
      <label for="username">用户名:</label>
      <input type="text" id="username" v-model="userName" class="form-control" placeholder="输入用户名">
    </div>
    <div class="form-group">
      <label for="age">年　龄:</label>
      <input type="text" id="age" v-model="age" class="form-control" placeholder="输入年龄">
    </div>
    <div class="form-group">
      <input type="button" v-on:click="addUser();" value="添加" class="btn btn-primary">
      <input type="button" value="重置" class="btn btn-danger">
    </div>
  </form>
  <hr>
  <table class="table table-bordered table-hover">
    <caption class="h2 text-info">用户信息表</caption>
    <tr class="text-danger">
      <th class="text-center">序号</th>
      <th class="text-center">名字</th>
      <th class="text-center">年龄</th>
      <th class="text-center">操作</th>
    </tr>
    <tr class="text-center" v-for="value in userList">
      <td>{{$index+1}}</td>
      <td>{{value.name}}</td>
      <td>{{value.age}}</td>
      <td>
        <button class="btn btn-primary btn-sm" data-toggle="modal" data-target="#layer"
            v-on:click="curIndex=$index">删除
        </button>
      </td>
    </tr>
    <tr v-show="userList.length!=0">
      <td colspan="4" class="text-right">
        <button class="btn btn-danger btn-sm" v-on:click="curIndex=-1" data-toggle="modal" data-target="#layer">
          删除全部
        </button>
      </td>
    </tr>
    <tr v-show="userList.length==0">
      <td colspan="4" class="text-center text-muted">
        <p>暂无数据....</p>
      </td>
    </tr>
  </table>

  <!--模态框 弹出框-->
  <div role="dialog" class="modal fade bs-example-modal-sm" id="layer">
    <div class="modal-dialog">
      <div class="modal-content">
        <div class="modal-header">
          <button type="button" class="close" data-dismiss="modal">
            <span>&times;</span>
          </button>
          <h4 class="modal-title">确认删除么?</h4>
        </div>
        <div class="modal-body text-right">
          <button data-dismiss="modal" class="btn btn-primary btn-sm">取消</button>
          <button data-dismiss="modal" class="btn btn-danger btn-sm" v-on:click="deleteRow(curIndex);">确认
          </button>
        </div>
      </div>
    </div>
  </div>
</div>
</body>
</html>

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