AngularJS中ng-options實(shí)現(xiàn)下拉列表的數(shù)據(jù)綁定方法

發(fā)布時間：2020-10-15 07:41:49 來源：腳本之家閱讀：181 作者：小飛鶴欄目：web開發(fā)

下拉列表的簡單使用

ng-option指令使用很簡單，只需要綁定兩個屬性：

一個是ng-model用于獲取選定的值；

另一個是ng-options用于確定下拉列表的元素?cái)?shù)組。

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

上面這條語句就是把選擇的值與engineer.currentActivity進(jìn)行雙向數(shù)據(jù)綁定，然后列表中的選項(xiàng)是activities中的每一個值。數(shù)據(jù)如下：

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

運(yùn)行結(jié)果如：

AngularJS中ng-options實(shí)現(xiàn)下拉列表的數(shù)據(jù)綁定方法

為了美觀一點(diǎn)，這里引用了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"  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>

復(fù)雜對象，自定義列表名稱

有的時候下拉列表并不是單純的字符串?dāng)?shù)組，可能是json對象，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" }
  ];

這個時候，綁定的數(shù)據(jù)就必須是與這里面的格式相同的數(shù)據(jù)，比如直接復(fù)制其中一條：

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

當(dāng)然也可以直接指定成：

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

然后在指令中可以循環(huán)列表拼接處下拉框的名稱

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

運(yùn)行效果如：

AngularJS中ng-options實(shí)現(xiàn)下拉列表的數(shù)據(jù)綁定方法

全部的代碼如下：

<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"  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>

實(shí)現(xiàn)下拉列表的分組

其實(shí)分組與前面的例子很像，只要把空間中的ng-options的值換成下面：

<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 就會按照后面的值進(jìn)行分組

AngularJS中ng-options實(shí)現(xiàn)下拉列表的數(shù)據(jù)綁定方法

全部代碼：

<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"  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進(jìn)行標(biāo)識

由于之前的ng-model相當(dāng)于初始的時候給設(shè)定了一個值。當(dāng)你選擇一個下拉列表選項(xiàng)的時候，就會覆蓋掉這個初始值。

所以更多的時候會使用一個id進(jìn)行標(biāo)識，這樣在初始化賦值的時候，只需要設(shè)定一個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" }
  ];

指令可以寫成下面的格式

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

通過 as 前面的值，就可以確定唯一的一個選項(xiàng)

AngularJS中ng-options實(shí)現(xiàn)下拉列表的數(shù)據(jù)綁定方法

全部代碼如下：

<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"  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>

以上這篇AngularJS中ng-options實(shí)現(xiàn)下拉列表的數(shù)據(jù)綁定方法就是小編分享給大家的全部內(nèi)容了，希望能給大家一個參考，也希望大家多多支持億速云。

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AngularJS中ng-options實(shí)現(xiàn)下拉列表的數(shù)據(jù)綁定方法

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