Hi,
I've been searching on how I can add an actionListener to my commandButton. But can't figure it out.
So what I wanna do is very simple I guess. It's just counting how many times a commandButton has been clicked.
Anyone can give a good solution how to do this?
Thanks
JSF<h:commandButton actionListener="#{myBean.actionListener}" />
MyBeanpublic void actionListener(ActionEvent event) {
// Implement.
}
Have you tried the actionListener attribute of the commandButton component? E.g.
<h:commandButton value="Go" actionListener="#{myBean.go}" />
where MyBean is something like
public class MyBean
{
private int count = 0;
public void go(ActionEvent event)
{
count++;
}
}
I'm assuming this is just a toy application to get things going; if this is for production you may need some synchronization.
BalusC beat me to it I see.
I'd rather to make the 'count' variabele static or at least make the bean session scoped. If this bean is request scoped, then the value of count will never be higher than 1.
Seems I'm getting an error when I click the button now.
Here's what I have:
<h:commandButton value="Volgende Vraag" action="#{EnqueteMBean.saveQa}" actionListener="#{EnqueteMBean.countClicks}" />
public class EnqueteMBean {
private int tellerClicks = 1;
public void countClicks(ActionEvent event) {
tellerClicks++;
System.out.println("Vraag: " + tellerClicks);
}
Error:
javax.servlet.ServletException: Exception while invoking expression #{EnqueteMBean.countClicks}
javax.faces.webapp.FacesServlet.service(FacesServlet.java:152)
org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:144)
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:368)
What could be the problem here?
Message was edited by:
eLIX
Message was edited by:
eLIX
> I'd rather to make the 'count' variabele static or at
> least make the bean session scoped. If this bean is
> request scoped, then the value of count will never be
> higher than 1.
Well, he didn't indicate what scope he wanted to count the button clicks on. I would rather make the bean application scope than use a static variable, it will be easier to synchronize; assuming he wants to count clicks app wide. Otherwise it should probably be session scoped.
Nevermind.
I tought it was impossible to count in my action method first. But now I see it is possible so the actionListener won't be needed anymore.
Still handy to know how I can implement an actionListener.
So thnx!
