是否有F之间的差异：Ajax和A4J：AJAX？ [英] Is there any difference between f:ajax and a4j:ajax?
问题描述
有间任何显著差异F：AJAX 和 A4J：AJAX 标签？
我知道A4J：从RichFaces的4 AJAX基于天然F：阿贾克斯像 onbegin ，<$ C $：阿贾克斯JSF2标签增加一些属性f中未发现C> onbeforedoupdate ， bypassUpdates ， limitRender ，状态和焦点，但使用哪一个时，我只需要发送一个简单的Ajax请求或部分呈现？是F之间存在性能问题：Ajax和A4J：AJAX
I know about a4j:ajax from Richfaces 4 is based on native f:ajax JSF2 tag adding some attributes not found in f:ajax like onbegin, onbeforedoupdate, bypassUpdates, limitRender, status and focus but which one to use when I only need to send a simple ajax request or partial rendering ? Is there performance issues between f:ajax and a4j:ajax?
推荐答案
在＆LT; A4J：AJAX＆GT; 标签的基本<$ C只是更方便的形式$ C>＆LT; F：AJAX＆GT; 标记。您可以在
The <a4j:ajax> tag is just the more convenient form of the basic <f:ajax> tag. You can find a nice overview of all differences in this page.
在执行属性支持一个额外的 @region 值指向＆LT; A4J ：地区＆GT; 。任何EL在执行和渲染属性在当前请求，而不是在最初的要求得到解决。
The execute attribute supports an extra @region value pointing to the <a4j:region>. Any EL in execute and render attributes is resolved in current request instead of in initial request.
这两个标签的的OnEvent 属性的JS函数将被调用3次（传入的 data.status 有那么值开始，完整，成功 ）。这将迫使你使用开关或如果当你只关心其中的一个或想要把他们不同。该＆LT; A4J：AJAX＆GT; 使这更方便的与 onbegin ， onbeforedomupdate 和的onComplete 分别属性。请参阅此相关的问题：<一href="http://stackoverflow.com/questions/7043840/jsf-2-how-show-different-ajax-status-in-same-input">JSF 2：如何表现出相同的输入不同的AJAX状态
The JS function of the onevent attribute of both tags will be invoked 3 times (the passed-in data.status has then the values begin, complete, success). This forces you to use a switch or if when you're only interested in one of them or want to treat them differently. The <a4j:ajax> makes this more convenient with onbegin, onbeforedomupdate and oncomplete attributes respectively. See also this related question: JSF 2: How show different ajax status in same input?
如果你不感兴趣的任何这些增强功能，然后用＆LT; F：AJAX＆GT; 应该是完全正常的为好。性能差异（而且必须是）完全忽略不计，不会选择一个比其他的原因。
If you're not interested in any of those enhancements, then using <f:ajax> should be perfectly fine as well. The performance difference is (and must be) totally negligible and not be the reason to choose one over the other.
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