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
>
