Question

I have something like:

<h:commandButton>
     <h:ajax event="click" listener="#{controller.onLog}" onchange="onLogProcess" />
     ....
</h:commandButton>

I send a post to the server, do some stuff in the listener function. Then I would like to return a string / message (respond) to the client back and catch it with javascript in “onLogProcess” to show to the user a customize string.

I’m looking into it, but I haven’t found anything yet…

Is there any way that I can do this with JSF?

I’m using JSF 2.1 / Mojarra 2.1.2

Thanks in advance!

Answer 1

Let <f:ajax> (not <h:ajax>!) conditionally render a <h:outputScript>.

<h:commandButton action="#{controller.onLog}">
    <f:ajax render="script" />
</h:commandButton>
<h:panelGroup id="script">
    <h:outputScript rendered="#{not empty controller.log}">
        onLogProcess('#{controller.log}');
    </h:outputScript>
</h:panelGroup>

Where #{controller.log} is your string which you’d like to pass to the JS function. Make sure that it doesn’t contain JS special characters like ', linebreaks, etc. Use if necessary Apache Commons Lang StringEscapeUtils#escapeJavaScript() for this.