Re: [Trinidad] Is there a way to have a custom JavaScript function be called when a validation error occurs?

[Richard Yee]

Walter,
Thanks. I'll try it out and let you know.

-Richard


Walter Mourão wrote:

Hi Richard,

I suppose you're not using the PPR API to show the "Loading..." message. If so the message should appear only after the client validation. I suggest you start using the PPR start/stop events. From the developer's guide:

      Monitoring AJAX requests

If you want to be notified when the client is busy waiting for an AJAX response, add a "state change listener" to the request queue:

    TrPage.getInstance().getRequestQueue().addStateChangeListener(myCallback);

Your callback will be passed a single parameter, which will be either TrRequestQueue.STATE_READY or TrRequestQueue.STATE_BUSY, depending on the current state of the request queue. The statusIndicator component uses exactly this mechanism to know when to start and stop spinning its indicator. You can optionally pass a second parameter to addStateChangeListener() for the "this" you want active when your callback is notified.

Sample code:

        <script type="text/javascript">
        // <![CDATA[
            function myCallback(state){
                if(state == TrRequestQueue.STATE_BUSY) {
                    //START OF PPR
                } else if(state == TrRequestQueue.STATE_READY){
                    //END OF PPR
                }
            }

TrPage.getInstance().getRequestQueue().addStateChangeListener(myCallback);

        // ]]>
        </script>

I hope it helps.


--
Walter Mourão
http://arcadian.com.br
http://waltermourao.com.br

2008/1/31, Richard Yee <[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>>:

    Everyone,
    I am showing a "Loading...." message when the user submits a form
    in my MyFaces/Trinidad application by having an onclick
    handler set the 'display' style to be 'inline' for my a
    tr:outputText tag. This works fine unless there is a validation
    error on the page for a required field. In this case, the
    JavaScript code for Trinidad detects the empty field and the page
    is not submitted. My "Loading..." message is still displayed
    however. Is there a way to hook into the Trinidad JavaScript
    validation code so that I can have one of my JavaScript functions
    set the display style  back to none in this case?

Thanks, Richard