a4j:jsFunction sending a synchronous AJAX request and returning a value

[awinizki]

I want to construct an a4j:jsFunction that:

• sends a synchronous (!) AJAX request
• waits until a response has arrived
• returns a value to the caller depending on data sent back from the server

Does anybody know how to do this?

[healeyb]

Hi, this example passes data to and back from the server. You need to use action= rather than actionListener

or the a4j:param isn't picked up (unless they've fixed it).

<h:commandButton value="click me" onclick="jsTest();"/>

<a4j:jsFunction name="jsTest"

                       oncomplete="alert(event.data)"

                       action="#{bean.jsTestAction}"

                       data="#{bean.jsTestData}">

        <a4j:param name="p1" value="Fred" assignTo="#{bean.jsTestParam}"/>

</a4j:jsFunction>

public class Bean ... {

     private String jsTestData;

     private String jsTestParam;

    public String jsTestAction() {

        jsTestData = "Hello " + jsTestParam;

        return null;

    }

     // getters & setters removed

}

The alert displays "Hello Fred".

Regards,

Brendan.