So although clearly AJAX is supposed to be mostly asynchronous. it looks
like the underlying XMLHttpRequest object _can_ be synchronous.
If I modify wicket-ajax.js and set 'Wicket.Ajax.Request.async' to
*false* -- suddenly my code works... i.e. I can code an
AjaxFormSubmitBehavor.onSubmit so it takes a value from one
FormComponent (the argument to the function), modifies it (in this case
toUppercase), and sends it back to another FormComponent, whose node I
can grab from the DOM tree and return inside my function.
So I guess my question is -- am I going to break something fundamental
by doing this? It seem to work fine in my test case.
<Javascript_function>
<script type="text/javascript" id="onTestMethod1"><!--/*--><![CDATA[/*><!--*/
TestMethod1 = function () {
var wcall=wicketSubmitFormById('form',
'/portal/tool/52480496-d4f6-4278-0002-e65fdefcc0ef/?wicket:interface=wicket-247:0:form:-1:IUnversionedBehaviorListener&wicket:behaviorId=0&wicket:ignoreIfNotActive=true',
null, function() { }, function() { });
return document.getElementById('form_result').value;;};
/*-->]]>*/</script>
</Javascript_function>
<AjaxFormSubmitBehavior.onSubmit>
@Override
protected void onSubmit(AjaxRequestTarget target) {
FormComponent c = (FormComponent)form.get("argument");
String testValue = (String)c.getConvertedInput();
FormComponent r = (FormComponent)form.get("result");
bean.setResult(testValue.toUpperCase());
target.addComponent(r);
}
</AjaxFormSubmitBehavior.onSubmit>
<wicket-ajax.js>
Wicket.Ajax.Request.prototype = {
initialize: function(url, loadedCallback, parseResponse, randomURL,
failureHandler, channel) {
this.url = url;
this.loadedCallback = loadedCallback;
this.parseResponse = parseResponse != null ? parseResponse : true;
this.randomURL = randomURL != null ? randomURL : true;
this.failureHandler = failureHandler != null ? failureHandler :
function() { };
this.async = *true;*
this.channel = channel;
this.suppressDone = false;
this.instance = Math.random();
this.debugContent = true;
},
</wicket-ajax.js>
Thanks,
James
Igor Vaynberg wrote:
> the short answer is: you cant do that. javascript is asynchronous, so
> the request will start _and_ your function will continue running.
> usually what is done is that you create a request object, and then
> register success and failure handlers that are executed after the
> request is done.
>
> you can do that using iajaxcalldecorator, or what you tried...calling
> ajaxtarget.appendjavascript() should work as well.
>
> if you show us some more code/try to describe your actual usecase we
> can probably help you more, right now its all very abstract.
>
> -igor
>
>
> On 5/3/07, *James Renfro* <[EMAIL PROTECTED]
> <mailto:[EMAIL PROTECTED]>> wrote:
>
> Hi,
> I'd like to do something slightly unusual and wrap the
> wicketSubmitFormById call in another javascript function -- I'm
> able to
> do this with no problem by overriding
> AjaxFormSubmitBehavor.onRenderHeadInitContribution and calling
> JavascriptUtils.writeJavascript on a wrapped getEventHandler. I
> can stop
> the normal attribute for 'onclick' or whatever from appearing
> inside the
> component tag by overriding onComponentTag. And by using text input
> boxes, I can pass 'arguments' to my method on the server inside using
> FormComponent.getConvertedInput. So far so good.
>
> The problem I have is that I'd like to actually 'return' a value back
> from the server in that Javascript function... so my function ends up
> looking just like a normal function call inside of my Javascript and
> returns the value that the server provides.
>
> I can see inside of wicket-ajax.js that there are three special tags:
> "component", "evaluate" and "header-contribution", each with their
> appropriate purpose -- I tried messing around with
> AjaxRequestTarget.prependJavascript so I could pass something through
> the 'evaluate' tag, but my javascript isn't sufficient to the
> task. Then
> I tried using AjaxRequestTarget.addComponent to modify another
> TextField
> and return the value through the DOM tree -- that works fine
> except for
> the fact that the order is wrong, so my method returns _before_ the
> component is updated.
>
> Then I noticed this interesting Wicket.Ajax.invokePostCallHandlers()
> call, which makes me wonder if there is already some nice clean
> mechanism in place for updating javascript variables thru wicket's
> java
> code.
>
> Apologies if this all makes no sense, but any advice or suggestions
> would be much appreciated. The basic requirement is just that I
> make a
> call in Javascript and get data back from the server as a 'returned'
> variable on the client.
>
> Thanks,
> James
>
> --
> James Renfro
> Programmer
> IET Mediaworks, UC Davis
> [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
> W: 530-754-5097
>
>
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--
James Renfro
Programmer
IET Mediaworks, UC Davis
[EMAIL PROTECTED]
W: 530-754-5097
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