Heh, those were exactly the pieces I was looking at.
The problem I saw with IJSONRender is that you couldn't have your page
implement renderComponent(IJSONWriter writer,..); it has to be some new
component that declared it. Then you'd attach a listener to this new
component (IDirect?), build a URL with DirectService, and bind() from the
client side to have the json method called. That's a lot of work (compared
to other things in Tapestry :) ) just to have control over contents of your
Ajax response. But then I'm just being lazy :)
Do you think something like this could work?
- extra param on @EventListener, say, callback(), which takes the name of a
function on the client to call with the built object (a la Yahoo Json web
services). Or if it's not @EventListener that we're using, just pass it as
another parameter on your DirectLink.
- have IJSONWriter (or the dojo xml writer) accessible by navigating
IRequestCycle
E.g.:
@EventListener(elements = "myFavoriteDiv", events = "onmouseover", callback
= "myObj.handleJson")
public void watchText(IRequestCycle cycle)
{
// get json writer, something like:
// IJSONWriter writer =
(IJSONWriter)cycle.getResponseBuilder().getWriter();
// etc...
}
Or instead of @EventListener, in your template:
<a jwcid="@DirectLink" listener="listener:watchText" json="ognl:true"
callback="myObj.handleJson">...
When response is done, it looks something like:
myObj.handleJson({"message": "Built on server", "time": "lunch time"});
On the client:
var myObj = {
handleJson: function (jsonResponse) {
//this is called automatically as soon as response is
eval()'ed
alert(jsonResponse.message);
}
}
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