![otCounter]( "otCounter")
本文介绍了p：ajax在h：graphicImage里面的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有问题发布一个ajax请求与Primefaces
< f：元数据>
< f：viewParam name =tokenvalue =＃{clientBean.token}/>
< f：event type =preRenderViewlistener =＃{clientBean.getParameter}/>
< / f：元数据>
< h：form>
< p：commandButton id =id4value =TactionListener =＃{clientBean.tag}/>
< p：ajax id =id3event =onclickonstart =dTag.show（）;
actionListener =＃{clientBean.tag}/>
< / h：graphicImage>
< / h：表格>
第一个 h：graphicImage 打开对话框正确地说， p：commandButton 会正确触发actionListener，但 p：ajax 没有效果（在Google应用上测试引擎）。
更新1
将事件从点击到点击是绝对正确的（感谢BalusC）：现在显示 p：dialog 。但仍然不会调用 tag（）方法。我使用 f：metadata 更新了 xhtml - 代码，因为还有一个额外的日志记录。
我认为它与 p：ajax 和bean的调用有关，我试过了 actionListener ， action 和 listener （来自Primefaces的文档），结果如下：
- 应用程序引擎日志调用 getParameter（ComponentSystemEvent event）并且Firebug显示这个部分更新：< changes>< update id =otCounter><<< ;！[CDATA [< span id =otCounter> 0< / span>]]>< / update> ..
- 调用 public void tag（ActionEvent ae）不会被记录（也试过 public void tag（））
p：commandButton 正确更新计数器。
更新2
我已经删除了 f：viewParam 和 f：现在使用侦听器和 public void tag（），但是方法不被调用： - （
更新3 BalusC的答案是正确的，在这里使用它时我还有其他问题： 解析方案 事件名称是错误的，它必须是点击，而前缀不包含。 $ b
< h：graphicImage id =id2url =/ images / circle-ok.png>
< p：ajax id =id3event =clickonstart =dTag.show（）;
listener =＃{clientBean.tag}/>
< / h：graphicImage>
事件前缀仅适用于为事件处理程序提供钩子的HTML元素属性的名称。请注意< p：ajax> 不支持 actionListener 属性。它必须是 listener ，并且应该引用一个方法，该方法需要作为参数（没有参数也非常好）。这与< f：ajax> 完全相同。
I have problem firing an ajax request with Primefaces
<f:metadata>
<f:viewParam name="token" value="#{clientBean.token}"/>
<f:event type="preRenderView" listener="#{clientBean.getParameter}" />
</f:metadata>
<h:form>
<h:graphicImage id="id1" url="/images/circle-ok.png" onclick="dTag.show();"/>
<p:commandButton id="id4" value="T" actionListener="#{clientBean.tag}" />
<!-- This does not work -->
<h:graphicImage id="id2" url="/images/circle-ok.png">
<p:ajax id="id3" event="onclick" onstart="dTag.show();"
actionListener="#{clientBean.tag}" />
</h:graphicImage>
</h:form>
The first h:graphicImage opens the dialog correctly, the p:commandButton triggers the actionListener correctly, but the p:ajax has no effects (tested on googles app engine).
Update 1Changing the event from onclick to click was absolutely right (thanks BalusC): Now the p:dialog is shown. But still the tag() method is not invoked. I've updated the xhtml-Code with f:metadata because there is one additional logging.I think it's related to p:ajax and the invocation of the bean, I've tried actionListener, action and listener (from the documentation of Primefaces) with the same result:
- The app engines logs the invocation of getParameter(ComponentSystemEvent event) and Firebug shows this partial-update: <changes><update id="otCounter"><![CDATA[<span id="otCounter">0</span>]]></update>..
- The invocation of public void tag(ActionEvent ae) is not logged (also tried public void tag())
The p:commandButton updates the counter correctly.
Update 2I've removed the f:viewParam and f:event for simplicity and now are using listener and public void tag(), but the method is not called :-(
Update 3 The answer of BalusC is correct, I have other problems when using it here: JSF and p:ajax inside p:dataTable inside ui:repeat
解决方案
The event name is wrong, it must be "click" without the on prefix.
<h:graphicImage id="id2" url="/images/circle-ok.png">
<p:ajax id="id3" event="click" onstart="dTag.show();"
listener="#{clientBean.tag}" />
</h:graphicImage>
The on prefix of events applies only the names of the HTML element attributes which provide a hook for the event handler. They do not represent full event names.
Note the <p:ajax> doesn't support the actionListener attribute. It has to be listener and should refer to a method which takes AjaxBehaviourEvent as argument (no arguments is also perfectly fine). This is exactly the same as on <f:ajax>.
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