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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
Figuren

AngularJS: API: ng/directive/ngIf

ngIf

  1. - directive in module ng

ngIf指令基于{表達(dá)式}來(lái)移除或重建DOM樹(shù)的一部分。如果賦給 ngIf的表達(dá)式計(jì)算結(jié)果為假，元素會(huì)從DOM移除，其它情況會(huì)復(fù)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，而不是通過(guò) display css 屬性改變可見(jiàn)。一種常見(jiàn)的情況是，這種差異表現(xiàn)在依靠一個(gè)元素在DOM的位置使用CSS選擇器時(shí)，例如 :first-child 或 :last-child 偽類。

注意，當(dāng)一個(gè)元素使用 ngIf 移除時(shí)，它的域會(huì)被銷毀，并且當(dāng)它恢復(fù)時(shí)一個(gè)新域會(huì)被創(chuàng)建。使用 ngIf 創(chuàng)建的域通過(guò) 原型繼承繼承它的父域。這個(gè)的重要含義是，如果在 ngIf 中使用ngModel會(huì)綁定到一個(gè)父域的javascript原始定義。這種情況下任何修改都會(huì)使子域的變化覆蓋父域的值。

同時(shí)， ngIf使用自己編譯狀態(tài)來(lái)重建元素。 這種行為的一個(gè)例子是，如果一個(gè)元素的class屬性在它編譯后被直接修改，使用像 jQuery's .addClass() 方法等，并且元素之后被刪掉。當(dāng)ngIf 重建元素，class屬性中已添加的類會(huì)丟失，因?yàn)闀?huì)使用原始編譯狀態(tài)來(lái)重生成元素。

此外， 你可以通過(guò) ngAnimate 模塊來(lái)執(zhí)行動(dòng)畫，控制 enter 和 leave 的效果。

指令信息

  • 這個(gè)指令會(huì)創(chuàng)建新的作用域(scope)。
  • 這個(gè)指令執(zhí)行優(yōu)先級(jí)為600.

用法

  • 作為屬性使用: 
    <ANY
  ng-if="">
...
</ANY>

動(dòng)畫

enter - 在ngIf內(nèi)容改變時(shí)發(fā)生，并且一個(gè)新DOM元素會(huì)被創(chuàng)建和加入到ngIf容器中。

leave - 在ngIf內(nèi)容從DOM移除時(shí)發(fā)生。

點(diǎn)擊這里 了解更多關(guān)于涉及動(dòng)畫的步驟。

參數(shù)

參數(shù) 類型 詳述
ngIf expression

如果表達(dá)式為假，元素從DOM樹(shù)移除。如果為真，復(fù)制一份已編譯過(guò)的元素添加到DOM樹(shù)。

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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