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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/ngIf

ngIf

  1. - directive in module ng

ngIf指令基于{表达式}来移除或重建DOM树的一部分。如果赋给 ngIf的表达式计算结果为假，元素会从DOM移除，其它情况会复制一份元素插入到DOM中。

ngIf 不同于 ngShow 和 ngHide ， ngIf 是在DOM中完全移除或重建元素，而不是通过 display css 属性改变可见。一种常见的情况是，这种差异表现在依靠一个元素在DOM的位置使用CSS选择器时，例如 :first-child 或 :last-child 伪类。

注意，当一个元素使用 ngIf 移除时，它的域会被销毁，并且当它恢复时一个新域会被创建。使用 ngIf 创建的域通过 原型继承继承它的父域。这个的重要含义是，如果在 ngIf 中使用ngModel会绑定到一个父域的javascript原始定义。这种情况下任何修改都会使子域的变化覆盖父域的值。

同时， ngIf使用自己编译状态来重建元素。 这种行为的一个例子是，如果一个元素的class属性在它编译后被直接修改，使用像 jQuery's .addClass() 方法等，并且元素之后被删掉。当ngIf 重建元素，class属性中已添加的类会丢失，因为会使用原始编译状态来重生成元素。

此外， 你可以通过 ngAnimate 模块来执行动画，控制 enter 和 leave 的效果。

指令信息

  • 这个指令会创建新的作用域(scope)。
  • 这个指令执行优先级为600.

用法

  • 作为属性使用: 
    <ANY
  ng-if="">
...
</ANY>

动画

enter - 在ngIf内容改变时发生，并且一个新DOM元素会被创建和加入到ngIf容器中。

leave - 在ngIf内容从DOM移除时发生。

点击这里 了解更多关于涉及动画的步骤。

参数

参数 类型 详述
ngIf expression

如果表达式为假，元素从DOM树移除。如果为真，复制一份已编译过的元素添加到DOM树。

示例

index.html
Click me: <input type="checkbox" ng-model="checked" ng-init="checked=true" /><br/>
Show when checked:<span ng-if="checked" class="animate-if">
  I'm removed when the checkbox is unchecked.
</span>
animations.css
.animate-if {
  background:white;
  border:1px solid black;
  padding:10px;}

.animate-if.ng-enter, .animate-if.ng-leave {
  -webkit-transition:all cubic-bezier(0.250, 0.460, 0.450, 0.940) 0.5s;
  transition:all cubic-bezier(0.250, 0.460, 0.450, 0.940) 0.5s;}

.animate-if.ng-enter,.animate-if.ng-leave.ng-leave-active {
  opacity:0;}

.animate-if.ng-leave,.animate-if.ng-enter.ng-enter-active {
  opacity:1;}
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