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AngularJS: API: ng/function/angular.element

angular.element

  1. - function in module ng

封装一个原始DOM元素或HTML字符串为一个 jQuery 元素。

如果存在jQuery, angular.element 作为jQuery 函数的别名。如果不存在jQuery,angular.element委托到Angular内建的jQuery子集,称为"jQuery lite" 或 "jqLite."

jqLite是一个微型的、API兼容的jQuery子集,允许Angular在跨浏览器兼容的方式下操纵DOM。jqLite只实现了所需的最常用功能。

要使用jQuery,只要简单的在DOMContentLoaded事件触发前载入即可。

注意: Angular中所有元素引用都用jQuery或jqLite进行了封装,从不会直接引用原始DOM。

Angular的jqLite

jqLite只提供了以下jQuery方法:

  • addClass()
  • after()
  • append()
  • attr()
  • bind() - 不支持namespaces、selectors或eventData
  • children() - 不支持selectors
  • clone()
  • contents()
  • css()
  • data()
  • empty()
  • eq()
  • find() - 只限于根据标签名查找
  • hasClass()
  • html()
  • next() - 不支持selectors
  • on() - 不支持namespaces、selectors或eventData
  • off() - 不支持namespaces、selectors
  • one() - 不支持namespaces、selectors
  • parent() - 不支持selectors
  • prepend()
  • prop()
  • ready()
  • remove()
  • removeAttr()
  • removeClass()
  • removeData()
  • replaceWith()
  • text()
  • toggleClass()
  • triggerHandler() - 传递一个虚拟的事件对象到handlers
  • unbind() - 不支持namespaces
  • val()
  • wrap()

jQuery/jqLite 扩展

Angular同时提供了以下额外的方法和事件到jQuery和jqLite:

事件

  • $destroy - AngularJS拦截所有jqLite/jQuery的DOM销毁api,并在所有DOM 节点被移除时触发这个事件。这可以在它被移除前用于清除任何绑定到DOM元素的第三方内容。

方法

  • controller(name) -获取当前元素或它父亲的控制器。默认获取的控制器与ngController指令相关。如果name 是驼峰式的指令名,这个指令的控制器会被获取到(如: 'ngModel')。
  • injector() - 获取当前元素或它父亲的注入。
  • scope() - 获取当前元素或它父亲的 scope 。
  • isolateScope() - 获取直接附加到当前元素的独立 scope。这个获取器只能用于包含开始一个新的独立域的指令的元素上。在这个元素上调用scope()永远返回原始的非独立域。
  • inheritedData() - 等同于 data(), 但是会遍历DOM直到找到一个值或到达最顶部父元素。

用法

angular.element(element);

参数

参数 类型 详述
element stringDOMElement

要被封装到jQuery的HTML字符串或DOM元素。

返回值

Object

jQuery对象。


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