Hi,
You can:
- directly use JQuery for your call. This will avoid the wicket logic at
client side.
- Mount an AbstractAjaxBehavior and on respond do something like
@Override
public void onRequest()
{
RequestCycle requestCycle = RequestCycle.get();
IRequestParameters parameters =
requestCycle.getRequest().getQueryParameters();
requestCycle.scheduleRequestHandlerAfterCurrent(new
TextRequestHandler(this.mimetype, this.encoding,
this.getResponse(parameters)));
}
See e.g.
https://github.com/sebfz1/wicket-jquery-ui/blob/wicket9.x/wicket-jquery-ui-core/src/main/java/com/googlecode/wicket/jquery/core/behavior/AjaxCallbackBehavior.java
as inspiration/reference.
This is how, for instance, Wicket wrapper for jqueryUI autocomplete
transfers the JSON used to build the autocomplete at client side.
On Sat, Nov 16, 2024 at 6:58 AM Stéphane V. <sva...@gmail.com> wrote:
> Sorry, I found my stupidity: I forgot the ! in the condition :-(
>
> if (requestValue.isEmpty() &&
> ajaxDispatchers.containsKey(requestValue.toString())) {
>
> if (!requestValue.isEmpty() &&
> ajaxDispatchers.containsKey(requestValue.toString())) {
>
> The JSON is now sent to the client, but wicket-ajax-jquery.js is creating
> an error because it's waiting for the tag ajax-response:
>
> wicket-ajax-jquery-ver-1722411717821.js:219 Wicket.Ajax.Call.failure: Error
> while parsing response: TypeError: envelope.getElementsByTagName is not a
> function
>
>
> Le sam. 16 nov. 2024 à 10:37, Stéphane V. <sva...@gmail.com> a écrit :
>
> > Hello everyone,
> >
> > I am working on making Ajax calls from a Panel/JavaScript component. This
> > component is entirely written in Typescript and uses a canvas element.
> The
> > only HTML elements within the Panel are <div><canvas></canvas></div> to
> > render the canvas.
> >
> > I would like to retrieve some information from the server when the
> > JavaScript component initializes. I was thinking of using Wicket.Ajax.get
> > for this. Throughout the lifecycle of the JavaScript component,
> additional
> > Ajax calls will be needed.
> >
> > On the server side, I believe I need to use an
> AbstractDefaultAjaxBehavior.
> > I want to use GET for retrieving data and POST with a JSON body for
> > sending data.
> >
> > Here’s my current implementation in the Panel:
> >
> > ajaxBehavior = new AbstractDefaultAjaxBehavior() {
> > @Override
> > protected void respond(AjaxRequestTarget target) {
> > final StringValue requestValue =
> getRequest().getRequestParameters().getParameterValue("request");
> > if (requestValue.isEmpty() &&
> ajaxDispatchers.containsKey(requestValue.toString())) {
> > final String request = requestValue.toString();
> > ajaxDispatchers.get(request).execute();
> > getRequestCycle().scheduleRequestHandlerAfterCurrent(new
> TextRequestHandler("application/json", "UTF-8",
> jsonService.toJson(Action.builder().action("translations").build())));
> > }
> > }
> > };
> > add(ajaxBehavior);
> >
> > Here is the code for the first Ajax call (TypeScript):
> >
> > Wicket.Ajax.get({
> > u: ajaxCallbackUrl,
> > c: componentId,
> > ep: {'request':'translations'},
> > dt: 'json',
> > sh: function (attributes: any) {
> > console.log("AJAX callback success:", attributes);
> > },
> > fh: function (attributes: any) {
> > console.error("AJAX callback failure:", attributes);
> > }
> > });
> >
> > The call is made to the server, but the JSON response is not parsed
> > correctly, and I get the following error in the browser console:
> >
> > Wicket.Ajax.Call.failure: Error while parsing response: SyntaxError:
> > Unexpected token '<', "<?xml vers" is not valid JSON
> > Indeed, the server response is and it's not the JSON I'm sending with my
> > panel:
> > <?xml version="1.0" encoding="UTF-8"?><ajax-response></ajax-response>
> >
> > Where did I go wrong?
> >
> > Thank you for your help!
> >
> > Regards,
> >
> > Stef
> >
>
--
Regards - Ernesto Reinaldo Barreiro
