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テキスト

AngularJS: API: ng/directive/ngShow

ngShow

  1. - directive in module ng

ngShow指令根据ngShow属性上表达式来显示或隐藏给定的HTML元素。元素的显示或隐藏是通过删除或添加ng-hideCSS 类到元素上来实现的。.ng-hide CSS 类是在AngularJS预定义的,并且设置显示样式为空(使用!important标记)。 对于CSP 模式请添加 angular-csp.css 到你的html文件(参见ngCsp)。

ng-show="myValue">
ng-show="myValue"class="ng-hide">

当ngShow表达式计算结果为假时,ng-hide CSS 类会被加到元素的class属性中,从而让它变为隐藏。当为真时,ng-hide CSS 类会从元素移除,这样元素就不会被隐藏。

为什么使用!important?

你可能想知道为什么要在ng-hide CSS类上使用!important。这是因为 .ng-hide选择器很容易被级别更高的选择器覆盖。例如,一些简单的改变HTML列表条目的显示样式会让隐藏的元素显示。这成为了处理CSS框架时最大的问题。

通过使用!important,显示和隐藏行为会按预期工作,而不管CSS选择器间的任何冲突(当!important没用在任何相矛盾的样式上时)。如果开发者决定覆盖样式来改变如何隐藏元素,那只需要在自己的CSS代码中配合使!important即可。

覆盖 .ng-hide

默认情况下,.ng-hide类使用display:none!important格式化元素。如果你希望改变ngShow/ngHide的隐藏行为,可通过在CSS中重新定义.ng-hide类来实现:

.ng-hide{/* this is just another form of hiding an element */display:block!important;position:absolute;top:-9999px;left:-9999px;}

默认情况下你不需要覆盖CSS中任何东西,动画就会针对显示样式生效。

ngShow动画的一些注意点

ngShow/ngHide中动画的显示和隐藏事件会在指令表达式为真或假时触发。 这个系统工作方式像ngClass的动画系统,除了你必须也包含!important标记到覆盖的显示属性中,这样就可以在元素隐藏动画期间正确执行。

////a working example can be found at the bottom of this page//.my-element.ng-hide-add,.my-element.ng-hide-remove{/* this is required as of 1.3x to properly apply all styling in a show/hide animation */transition:0slinear all;}.my-element.ng-hide-add-active,.my-element.ng-hide-remove-active{/* the transition is defined in the active class */transition:1slinear all;}.my-element.ng-hide-add{...}.my-element.ng-hide-add.ng-hide-add-active{...}.my-element.ng-hide-remove{...}.my-element.ng-hide-remove.ng-hide-remove-active{...}

记住,AngularJS的1.3.0-beta.11版本里, 不需要通过阻塞动画过程来改变显示属性,ngAnimate会为你自动处理样式的切换。

指令信息

  • 这个指令执行优先级为0.

用法

  • 作为属性使用:
    ng-show="">...

动画

addClass: .ng-hide - 在ngShow表达式计算结果为非真时生效,并且是在内容被显示前。

removeClass: .ng-hide - 在ngShow表达式计算结果为真时生效,并且是在内容被隐藏前。

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
ngShow expression

如果表达式为真则显示元素,否则隐藏。

示例

index.html
Clickme:<input type="checkbox"ng-model="checked"><br/>
Show:<divclass="check-element animate-show"ng-show="checked"><spanclass="glyphicon glyphicon-thumbs-up">span>I show upwhenyour checkboxischecked.</div> div>
Hide:<divclass="check-element animate-show"ng-hide="checked"><spanclass="glyphicon glyphicon-thumbs-down">span>I hidewhenyour checkboxischecked.</div> div>
glyphicons.css
@importurl(//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap-glyphicons.css);
animations.css
.animate-show{line-height:20px;opacity:1;padding:10px;border:1pxsolid black;background:white;}.animate-show.ng-hide-add.ng-hide-add-active,.animate-show.ng-hide-remove.ng-hide-remove-active{-webkit-transition:all linear0.5s;transition:all linear0.5s;}.animate-show.ng-hide{line-height:0;opacity:0;padding:010px;}.check-element{padding:10px;border:1pxsolid black;background:white;}
protractor.js
varthumbsUp=element(by.css('span.glyphicon-thumbs-up'));varthumbsDown=element(by.css('span.glyphicon-thumbs-down'));it('should check ng-show / ng-hide',Function(){expect(thumbsUp.isDisplayed()).toBeFalsy();expect(thumbsDown.isDisplayed()).toBeTruthy();element(by.model('checked')).click();expect(thumbsUp.isDisplayed()).toBeTruthy();expect(thumbsDown.isDisplayed()).toBeFalsy();});
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