如何以编程方式或动态地将 ajax 侦听器添加到 JSF 2 组件？
如何以编程方式或动态地将 ajax 侦听器添加到 JSF 2 组件？
我尝试过：
...
FacesContext facesContext = FacesContext.getCurrentInstance();
AjaxBehavior dragStart = (AjaxBehavior)facesContext.getApplication().createBehavior(AjaxBehavior.BEHAVIOR_ID);
dragStart.addAjaxBehaviorListener(new DragEnterListener());
dragStart.setTransient(true);
component.addClientBehavior("dragstart", dragStart);
...
public class DragEnterListener implements AjaxBehaviorListener {
@Override
public void processAjaxBehavior(AjaxBehaviorEvent event) throws AbortProcessingException {
System.out.println("AjaxListener CALLED!!! ");
}
}
但这不起作用。在页面中我遇到了这个 JS 异常：
serverError: class java.lang.IllegalStateException
cz.boza.formcreator.FormModel$DragEnterListener
我在 RichFaces 中找到了这个示例： http://community.jboss.org/message/611571
但是在 AjaxBehavior 类中的普通 JSF 2 中不存在
addAjaxBehaviorListener(MethodExpression methodExpression)
，只是
addAjaxBehaviorListener(ValueExpression valueExpression)
我已经尝试解决这个问题很多天了。
请帮忙。
非常感谢。
How to programmatically or dynamically add ajax listener to JSF 2 component?
I tried:
...
FacesContext facesContext = FacesContext.getCurrentInstance();
AjaxBehavior dragStart = (AjaxBehavior)facesContext.getApplication().createBehavior(AjaxBehavior.BEHAVIOR_ID);
dragStart.addAjaxBehaviorListener(new DragEnterListener());
dragStart.setTransient(true);
component.addClientBehavior("dragstart", dragStart);
...
public class DragEnterListener implements AjaxBehaviorListener {
@Override
public void processAjaxBehavior(AjaxBehaviorEvent event) throws AbortProcessingException {
System.out.println("AjaxListener CALLED!!! ");
}
}
But thid doesn't work. In page I've got this JS exception:
serverError: class java.lang.IllegalStateException
cz.boza.formcreator.FormModel$DragEnterListener
I found this example in RichFaces:
http://community.jboss.org/message/611571
But in plain JSF 2 in AjaxBehavior class there is no
addAjaxBehaviorListener(MethodExpression methodExpression)
there is only
addAjaxBehaviorListener(ValueExpression valueExpression)
I'm trying to solve this for many days.
Please help.
Thank you very much.
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好的，所以我做了更多研究，发现如果我不想添加ajax侦听器的
组件也被动态添加（来自java - 就像parant.getChildren().add(组件））进入页面，一切正常。但是，如果我不想添加ajax侦听器的< /code>) 进入页面，引发上述奇怪的异常：
组件是静态添加的（在jsp中 - 就像我将尝试在 JSF 论坛中提出这个问题。可能这是 Mojara 中的一个错误。
OK, so I made more research and found that if the
componentin which I wan't to add ajax listener is also added dynamically (from java - likeparant.getChildren().add(component)) into the page, everything works fine.But if
componentin which I wan't to add ajax listener is is added statically (in jsp - like<h:panelGroup binding="#{bean.component}">) into the page, aforementioned weird exception is thrown:I will try to ask this question in JSF forum. May be it's a bug in Mojara.