AngularJS使用ngOption实现下拉列表的实例代码

摘要：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...

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。

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：

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"> <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"> <div> {{engineer.name}} is currently: {{ engineer.currentActivity}} </div> <div> <label for="name">Choose a new activity:</label> <select ng-model="engineer.currentActivity" 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

运行效果如：

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"> <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"> <div> {{engineer.name}} is currently: {{ engineer.currentActivity}} </div> <div> <label for="name">Choose a new activity:</label> <select ng-model = "engineer.currentActivity" 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：

添加 group by 就会按照后面的值进行分组

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"> <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"> <div> {{engineer.name}} is currently: {{ engineer.currentActivity}} </div> <div> <label for="name">Choose a new activity:</label>  <select ng-model = "engineer.currentActivity" 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

通过 as 前面的值，就可以确定唯一的一个选项

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"> <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"> <div> current is: {{ engineer.currentActivityId}} </div> <div> <label for="name">Choose a new activity:</label> <select ng-model = "engineer.currentActivityId" 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>

以上所述是小编给大家分享的AngularJS使用ngOption实现下拉列表的实例代码，希望对大家有所帮助。