编程 Javascript

AngularJS中ng-options实现下拉列表的数据绑定方法

Posted in Javascript onAugust 13, 2018

下拉列表的简单使用

ng-option指令使用很简单，只需要绑定两个属性：

一个是ng-model用于获取选定的值；

另一个是ng-options用于确定下拉列表的元素数组。

<select ng-model="engineer.currentActivity" class="form-control" ng-options="act for act in activities"></select>

上面这条语句就是把选择的值与engineer.currentActivity进行双向数据绑定，然后列表中的选项是activities中的每一个值。数据如下：

$scope.engineer = {
  name: "Dani",
  currentActivity: "Fixing bugs"
  };
  
  $scope.activities =
  [
  "Writing code",
  "Testing code",
  "Fixing bugs",
  "Dancing"
  ];

运行结果如：

AngularJS中ng-options实现下拉列表的数据绑定方法

为了美观一点，这里引用了bootstrap。

<html ng-app="myApp">
<head>
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 <script src="http://apps.bdimg.com/libs/angular.js/1.2.16/angular.min.js"></script>
 <link rel="stylesheet" href="http://apps.bdimg.com/libs/bootstrap/3.3.0/css/bootstrap.min.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > 
 <script src="http://apps.bdimg.com/libs/jquery/2.1.1/jquery.min.js"></script>
 <script src="http://apps.bdimg.com/libs/bootstrap/3.3.0/js/bootstrap.min.js"></script>
</head>
<body>
 <div ng-controller="EngineeringController" class="container">
 <div class="col-md-12">
  {{engineer.name}} is currently: {{ engineer.currentActivity}}
 </div>
 <div class="col-md-4">
  <label for="name">Choose a new activity:</label>
  <select ng-model="engineer.currentActivity" class="form-control"
   ng-options="act for act in activities">  
  </select>
 </div>
 </div>
 <script type="text/javascript">
  var myAppModule = angular.module("myApp",[]);
  myAppModule.controller("EngineeringController",["$scope",function($scope){
  $scope.engineer = {
  name: "Dani",
  currentActivity: "Fixing bugs"
  };
  
  $scope.activities =
  [
  "Writing code",
  "Testing code",
  "Fixing bugs",
  "Dancing"
  ];
  }]);
 </script>
</body>
</html>

复杂对象，自定义列表名称

有的时候下拉列表并不是单纯的字符串数组，可能是json对象，例如：

$scope.activities =
  [
   { id: 1, type: "Work" , name: "Writing code" },
   { id: 2, type: "Work" , name: "Testing code" },
   { id: 3, type: "Work" , name: "Fixing bugs" },
   { id: 4, type: "Play" , name: "Dancing" }
  ];

这个时候，绑定的数据就必须是与这里面的格式相同的数据，比如直接复制其中一条：

$scope.engineer = {
   name: "Dani" ,
   currentActivity: {
   id: 3,
   type: "Work" ,
   name: "Fixing bugs"
   }
  };

当然也可以直接指定成：

$scope.engineer = {currentActivity:activities[3]}

然后在指令中可以循环列表拼接处下拉框的名称

<select 
 ng-model = "engineer.currentActivity"
 class="form-control"
 ng-options = "a.name +' (' + a.type + ')' for a in activities" >  
</select >

运行效果如：

AngularJS中ng-options实现下拉列表的数据绑定方法

全部的代码如下：

<html ng-app="myApp">
<head>
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 <script src="http://apps.bdimg.com/libs/angular.js/1.2.16/angular.min.js"></script>
 <link rel="stylesheet" href="http://apps.bdimg.com/libs/bootstrap/3.3.0/css/bootstrap.min.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > 
 <script src="http://apps.bdimg.com/libs/jquery/2.1.1/jquery.min.js"></script>
 <script src="http://apps.bdimg.com/libs/bootstrap/3.3.0/js/bootstrap.min.js"></script>
</head>
<body>
 <div ng-controller="EngineeringController" class="container">
 <div class="col-md-12">
 {{engineer.name}} is currently: {{ engineer.currentActivity}}
 </div>
 <div class="col-md-4">
  <label for="name">Choose a new activity:</label>  
  <select 
  ng-model = "engineer.currentActivity"
  class="form-control"
  ng-options = "a.name +' (' + a.type + ')' for a in activities" >  
  </select > 
 </div>
 </div>
 <script type="text/javascript">
  var myAppModule = angular.module("myApp",[]);
  myAppModule.controller("EngineeringController",["$scope",function($scope){
  $scope.engineer = {
   name: "Dani" ,
   currentActivity: {
   id: 3,
   type: "Work" ,
   name: "Fixing bugs"
   }
  };
  
  $scope.activities =
  [
   { id: 1, type: "Work" , name: "Writing code" },
   { id: 2, type: "Work" , name: "Testing code" },
   { id: 3, type: "Work" , name: "Fixing bugs" },
   { id: 4, type: "Play" , name: "Dancing" }
  ];
  }]);
 </script>
</body>
</html>

实现下拉列表的分组

其实分组与前面的例子很像，只要把空间中的ng-options的值换成下面：

<select ng-model = "engineer.currentActivity"
 class="form-control"
 ng-options = "a.name group by a.type for a in activities" >  
</select >

添加 group by 就会按照后面的值进行分组

AngularJS中ng-options实现下拉列表的数据绑定方法

全部代码：

<html ng-app="myApp">
<head>
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 <script src="http://apps.bdimg.com/libs/angular.js/1.2.16/angular.min.js"></script>
 <link rel="stylesheet" href="http://apps.bdimg.com/libs/bootstrap/3.3.0/css/bootstrap.min.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > 
 <script src="http://apps.bdimg.com/libs/jquery/2.1.1/jquery.min.js"></script>
 <script src="http://apps.bdimg.com/libs/bootstrap/3.3.0/js/bootstrap.min.js"></script>
</head>
<body>
 <div ng-controller="EngineeringController" class="container">
 <div class="col-md-12">
 {{engineer.name}} is currently: {{ engineer.currentActivity}}
 </div>
 <div class="col-md-4">
  <label for="name">Choose a new activity:</label>  
  <!-- <select 
  ng-model = "engineer.currentActivity"
  class="form-control"
  ng-options = "a.name +' (' + a.type + ')' for a in activities" >  
  </select > -->
  <select ng-model = "engineer.currentActivity"
   class="form-control"
   ng-options = "a.name group by a.type for a in activities" >  
  </select > 
 </div>
 </div>
 <script type="text/javascript">
  var myAppModule = angular.module("myApp",[]);
  myAppModule.controller("EngineeringController",["$scope",function($scope){
  $scope.engineer = {
   name: "Dani" ,
   currentActivity: {
   id: 3,
   type: "Work" ,
   name: "Fixing bugs"
   }
  };
  
  $scope.activities =
  [
   { id: 1, type: "Work" , name: "Writing code" },
   { id: 2, type: "Work" , name: "Testing code" },
   { id: 3, type: "Work" , name: "Fixing bugs" },
   { id: 4, type: "Play" , name: "Dancing" }
  ];
  }]);
 </script>
</body>
</html>

按照id进行标识

由于之前的ng-model相当于初始的时候给设定了一个值。当你选择一个下拉列表选项的时候，就会覆盖掉这个初始值。

所以更多的时候会使用一个id进行标识，这样在初始化赋值的时候，只需要设定一个id就可以了。

$scope.engineer = {
   currentActivityId: 3
  };
  
  $scope.activities =
  [
   { id: 1, type: "Work" , name: "Writing code" },
   { id: 2, type: "Work" , name: "Testing code" },
   { id: 3, type: "Work" , name: "Fixing bugs" },
   { id: 4, type: "Play" , name: "Dancing" }
  ];

指令可以写成下面的格式

<select 
 ng-model = "engineer.currentActivityId"
 class="form-control"
 ng-options = "a.id as a.name group by a.type for a in activities" >  
</select >

通过 as 前面的值，就可以确定唯一的一个选项

AngularJS中ng-options实现下拉列表的数据绑定方法

全部代码如下：

<html ng-app="myApp">
<head>
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 <script src="http://apps.bdimg.com/libs/angular.js/1.2.16/angular.min.js"></script>
 <link rel="stylesheet" href="http://apps.bdimg.com/libs/bootstrap/3.3.0/css/bootstrap.min.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" > 
 <script src="http://apps.bdimg.com/libs/jquery/2.1.1/jquery.min.js"></script>
 <script src="http://apps.bdimg.com/libs/bootstrap/3.3.0/js/bootstrap.min.js"></script>
</head>
<body>
 <div ng-controller="EngineeringController" class="container">
 <div class="col-md-12">
 current is: {{ engineer.currentActivityId}}
 </div>
 <div class="col-md-4">
  <label for="name">Choose a new activity:</label>  
  <select 
  ng-model = "engineer.currentActivityId"
  class="form-control"
  ng-options = "a.id as a.name group by a.type for a in activities" >  
  </select > 
 </div>
 </div>
 <script type="text/javascript">
  var myAppModule = angular.module("myApp",[]);
  myAppModule.controller("EngineeringController",["$scope",function($scope){
  $scope.engineer = {
   currentActivityId: 3
  };
  
  $scope.activities =
  [
   { id: 1, type: "Work" , name: "Writing code" },
   { id: 2, type: "Work" , name: "Testing code" },
   { id: 3, type: "Work" , name: "Fixing bugs" },
   { id: 4, type: "Play" , name: "Dancing" }
  ];
  }]);
 </script>
</body>
</html>

以上这篇AngularJS中ng-options实现下拉列表的数据绑定方法就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持三水点靠木。

AngularJS中ng-options实现下拉列表的数据绑定方法

- Author -

小飞鹤

声明：登载此文出于传递更多信息之目的，并不意味着赞同其观点或证实其描述。

Javascript 相关文章推荐

JavaScript继承方式实例

Oct 29 Javascript

js 连接数据库如何操作数据库中的数据

Nov 23 Javascript

Extjs4中tree的拖拽功能(可以两棵树之间拖拽) 简单实例

Dec 08 Javascript

jQuery操作CheckBox的方法介绍(选中,取消,取值)

Feb 04 Javascript

百度UEditor编辑器如何关闭抓取远程图片功能

Mar 03 Javascript

JavaScript实现页面5秒后自动跳转的方法

Apr 16 Javascript

js日期范围初始化得到前一个月日期的方法

May 05 Javascript

jQuery三级下拉列表导航菜单代码分享

Apr 15 Javascript

canvas实现流星雨的背景效果

Jan 13 Javascript

自适应布局meta标签中viewport、content、width、initial-scale、minimum-scale、maximum-scale总结

Aug 18 Javascript

JS简单添加元素新节点的方法示例

Feb 10 Javascript

ES6 Object属性新的写法实例小结

Jun 25 Javascript

JavaScript面向对象程序设计创建对象的方法分析

Aug 13 #Javascript

vue.js template模板的使用(仿饿了么布局)

Aug 13 #Javascript

angularjs 动态从后台获取下拉框的值方法

Aug 13 #Javascript

vue2.0 中使用transition实现动画效果使用心得

Aug 13 #Javascript

vue.js2.0 实现better-scroll的滚动效果实例详解

Aug 13 #Javascript

jQuery实现图片简单轮播功能示例

Aug 13 #jQuery

vue.js 实现评价五角星组件的实例代码

Aug 13 #Javascript