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文字

AngularJS: API: ng/directive/ngCloak

ngCloak

  1. - directive in module ng

ngCloak 指令是用来防止应用程序加载时Angular HTML模板的原始形式(未编译的)被浏览器显示为简要形式。使用这个指令,避免由HTML模板显示造成不舒服的闪烁效果。

这个指令能被应用到 <body> 元素上,但推荐的用法是将多个ngCloak 指令应用到页面的一小部分来允许浏览器视图渐进式渲染。

ngCloak的使用要配合angular.jsangular.min.js内嵌的css规则。对于CSP模式,请添加 angular-csp.css到你的html文件(参见ngCsp)。

[ng\:cloak], [ng-cloak], [data-ng-cloak], [x-ng-cloak], .ng-cloak, .x-ng-cloak {
  display: none !important;}

当这个CSS规则被浏览器加载时,所有的HTML元素(包括孩子)的ngCloak 指令对应的标签是隐藏的。当Angular在模板编译时遇到这个指令,它删除ngCloak元素属性,使编译后的元素可见。

为获得最佳效果, angular.js脚本必须在HTML文档的头部加载;另外,上面的CSS规则必须包含在应用程序的外部样式表中。

传统的浏览器,如IE7,不提供属性选择支持(CSS2.1才支持),所以他们不能匹配[ng\:cloak] 选择器。为了绕过这个限制,除ngCloak指令之外,你必须添加CSS类 ng-cloak,如下面的例子所示。

指令信息

  • 这个指令执行优先级为0.

用法

  • 作为属性使用:
    <ANY>
    ...
    </ANY>
  • 作为CSS类使用:
    <ANY class=""> ... </ANY>

示例

index.html
<div id="template1" ng-cloak>{{ 'hello' }}</div>
<div id="template2" ng-cloak class="ng-cloak">{{ 'hello IE7' }}</div>
protractor.js
it('should remove the template directive and css class', Function() {
  expect($('#template1').getAttribute('ng-cloak')).
    toBeNull();
  expect($('#template2').getAttribute('ng-cloak')).
    toBeNull();});
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