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AngularJS API Reference auto auto/service auto/service/$injector auto/service/$provide ng ng/directive ng/directive/a ng/directive/form ng/directive/input ng/directive/input[checkbox] ng/directive/input[date] ng/directive/input[dateTimeLocal] ng/directive/input[email] ng/directive/input[month] ng/directive/input[number] ng/directive/input[radio] ng/directive/input[text] ng/directive/input[time] ng/directive/input[url] ng/directive/input[week] ng/directive/ngApp ng/directive/ngBind ng/directive/ngBindHtml ng/directive/ngBindTemplate ng/directive/ngBlur ng/directive/ngChange ng/directive/ngChecked ng/directive/ngClass ng/directive/ngClassEven ng/directive/ngClassOdd ng/directive/ngClick ng/directive/ngCloak ng/directive/ngController ng/directive/ngCopy ng/directive/ngCsp ng/directive/ngCut ng/directive/ngDblclick ng/directive/ngDisabled ng/directive/ngFocus ng/directive/ngForm ng/directive/ngHide ng/directive/ngHref ng/directive/ngIf ng/directive/ngInclude ng/directive/ngInit ng/directive/ngKeydown ng/directive/ngKeypress ng/directive/ngKeyup ng/directive/ngList ng/directive/ngModel ng/directive/ngModelOptions ng/directive/ngMousedown ng/directive/ngMouseenter ng/directive/ngMouseleave ng/directive/ngMousemove ng/directive/ngMouseover ng/directive/ngMouseup ng/directive/ngNonBindable ng/directive/ngOpen ng/directive/ngPaste ng/directive/ngPluralize ng/directive/ngReadonly ng/directive/ngRepeat ng/directive/ngSelected ng/directive/ngShow ng/directive/ngSrc ng/directive/ngSrcset ng/directive/ngStyle ng/directive/ngSubmit ng/directive/ngSwitch ng/directive/ngTransclude ng/directive/ngValue ng/directive/script ng/directive/select ng/directive/textarea ng/filter ng/filter/currency ng/filter/date ng/filter/filter ng/filter/json ng/filter/limitTo ng/filter/lowercase ng/filter/number ng/filter/orderBy ng/filter/uppercase ng/function ng/function/angular.bind ng/function/angular.bootstrap ng/function/angular.copy ng/function/angular.element ng/function/angular.equals ng/function/angular.extend ng/function/angular.forEach ng/function/angular.fromJson ng/function/angular.identity ng/function/angular.injector ng/function/angular.isArray ng/function/angular.isDate ng/function/angular.isDefined ng/function/angular.isElement ng/function/angular.isFunction ng/function/angular.isNumber ng/function/angular.isObject ng/function/angular.isString ng/function/angular.isUndefined ng/function/angular.lowercase ng/function/angular.module ng/function/angular.noop ng/function/angular.toJson ng/function/angular.uppercase ng/object ng/object/angular.version ng/provider ng/provider/$animateProvider ng/provider/$compileProvider ng/provider/$controllerProvider ng/provider/$filterProvider ng/provider/$httpProvider ng/provider/$interpolateProvider ng/provider/$locationProvider ng/provider/$logProvider ng/provider/$parseProvider ng/provider/$rootScopeProvider ng/provider/$sceDelegateProvider ng/provider/$sceProvider ng/service ng/service/$anchorScroll ng/service/$animate ng/service/$cacheFactory ng/service/$compile ng/service/$controller ng/service/$document ng/service/$exceptionHandler ng/service/$filter ng/service/$http ng/service/$httpBackend ng/service/$interpolate ng/service/$interval ng/service/$locale ng/service/$location ng/service/$log ng/service/$parse ng/service/$q ng/service/$rootElement ng/service/$rootScope ng/service/$sce ng/service/$sceDelegate ng/service/$templateCache ng/service/$timeout ng/service/$window ng/type ng/type/$cacheFactory.Cache ng/type/$compile.directive.Attributes ng/type/$rootScope.Scope ng/type/angular.Module ng/type/form.FormController ng/type/ngModel.NgModelController ngAnimate ngAnimate/provider ngAnimate/provider/$animateProvider ngAnimate/service ngAnimate/service/$animate ngCookies ngCookies/service ngCookies/service/$cookies ngCookies/service/$cookieStore ngMessages ngMessages/directive ngMessages/directive/ngMessage ngMessages/directive/ngMessages ngMock ngMock/function ngMock/function/angular.mock.dump ngMock/function/angular.mock.inject ngMock/function/angular.mock.module ngMock/object ngMock/object/angular.mock ngMock/provider ngMock/provider/$exceptionHandlerProvider ngMock/service ngMock/service/$exceptionHandler ngMock/service/$httpBackend ngMock/service/$interval ngMock/service/$log ngMock/service/$timeout ngMock/type ngMock/type/angular.mock.TzDate ngMockE2E ngMockE2E/service ngMockE2E/service/$httpBackend ngResource ngResource/service ngResource/service/$resource ngRoute ngRoute/directive ngRoute/directive/ngView ngRoute/provider ngRoute/provider/$routeProvider ngRoute/service ngRoute/service/$route ngRoute/service/$routeParams ngSanitize ngSanitize/filter ngSanitize/filter/linky ngSanitize/service ngSanitize/service/$sanitize ngTouch ngTouch/directive ngTouch/directive/ngClick ngTouch/directive/ngSwipeLeft ngTouch/directive/ngSwipeRight ngTouch/service ngTouch/service/$swipe

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AngularJS: API: ng/directive/select

select

  1. - directive in module ng

带有angular数据绑定功能的HTML SELECT 元素。

ngOptions

ngOptions 属性可用于动态生成<option>元素列表，当对<select>元素使用数组，或者是 ngOptions可解析的表达式计算得到的对象。

当<select>菜单中的一项被选中时，数组元素或对象属性作为被选中的选项绑定到模型的 ngModel指令。

注意： ngModel通过引用比较，而非值比较。这在使用对象数组 绑定时很重要。参见示例in this jsfiddle.

此外，设置为空字符串值的单个硬编码的<option>元素可以嵌套到 <select>元素中。这个元素将表现为null或 "not selected"选项。参见下面的示例演示。

注意： ngOptions 为<option>提供了一个迭代器工厂用于替代 ngRepeat，在你想让 select模型绑定到非字符串值时。这是因为一个选项元素只能被绑定到一个字符串值上。

指令信息

  • 这个指令执行优先级为0.

用法

  • 作为元素使用: 
    <select
  ng-model=""
  [name=""]
  [required=""]
  [ng-required=""]
  [ng-options=""]>
...
</select>

参数

参数 类型 详述
ngModel string

声明用于数据绑定的Angular表达式。
name
(可选)
 string

发布到表单下的控件的属性名称。
required
(可选)
 string

控件只有输入值才被认为有效。
ngRequired
(可选)
 string

当ngRequired表达式等于true时，添加required属性和required验证约束到元素上。 使用ngRequired替换required，当你想数据绑定到required属性上时。
ngOptions
(可选)
 comprehension_expression

下列形式之一：

  • 当数据源为数组：
    • label for value in array
    • select as label for value in array
    • label group by group for value in array
    • select as label group by group for value in array track by trackexpr
  • 当数据源为对象：
    • label for (key , value) in Object
    • select as label for (key , value) in Object
    • label group by group for (key, value) in Object
    • select as label group by group for (key, value) in Object

这里:

  • array / Object:用于进行迭代的结果为一个数组或对象的表达式。
  • value: 局部变量，迭代期间指向array中的每个条目，或Object的每个属性值。
  • key: 局部变量，迭代期间指向Object的属性名称。
  • label: 这个表达式的结果作为<option>元素的标签。表达式通常指向value 变量 (如 value.propertyName)。
  • select:这个表达式的结果会绑定到父<select>元素的模型上。如果未指定，select表达式默认为value。
  • group: 这个表达式的结果会被用于使用<optgroup> DOM 元素分组选项。
  • trackexpr: 应用于对象数组。表达式的结果被用唯一标识数组中的对象。 trackexpr通常指向value变量(如value.propertyName)。

示例

index.html
<script>
angular.module('selectExample', [])
  .controller('ExampleController', ['$scope', Function($scope) {
    $scope.colors = [
      {name:'black', shade:'dark'},
      {name:'white', shade:'light'},
      {name:'red', shade:'dark'},
      {name:'blue', shade:'dark'},
      {name:'yellow', shade:'light'}
    ];
    $scope.myColor = $scope.colors[2]; // red
  }]);
</script>
<div ng-controller="ExampleController">
  <ul>
    <li ng-repeat="color in colors">
      Name: <input ng-model="color.name">
      [<a href ng-click="colors.splice($index, 1)">X</a>]
    </li>
    <li>
      [<a href ng-click="colors.push({})">add</a>]
    </li>
  </ul>
  <hr/>
  Color (null not allowed):
  <select ng-model="myColor" ng-options="color.name for color in colors"></select><br>

  Color (null allowed):
  <span  class="nullable">
    <select ng-model="myColor" ng-options="color.name for color in colors">
      <option value="">-- choose color --</option>
    </select>
  </span><br/>

  Color grouped by shade:
  <select ng-model="myColor" ng-options="color.name group by color.shade for color in colors">
  </select><br/>


  Select <a href ng-click="myColor = { name:'not in list', shade: 'other' }">bogus</a>.<br>
  <hr/>
  Currently selected: {{ {selected_color:myColor}  }}
  <div style="border:solid 1px black; height:20px"
       ng-style="{'background-color':myColor.name}">
  </div>
</div>
protractor.js
it('should check ng-options', Function() {
  expect(element(by.binding('{selected_color:myColor}')).getText()).toMatch('red');
  element.all(by.model('myColor')).first().click();
  element.all(by.css('select[ng-model="myColor"] option')).first().click();
  expect(element(by.binding('{selected_color:myColor}')).getText()).toMatch('black');
  element(by.css('.nullable select[ng-model="myColor"]')).click();
  element.all(by.css('.nullable select[ng-model="myColor"] option')).first().click();
  expect(element(by.binding('{selected_color:myColor}')).getText()).toMatch('null');});
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