Hi,
On Tue, May 31, 2022 at 6:50 AM Joachim Schrod <[email protected]> wrote:
>
> Hi,
>
> I'm tasked with upgrading an application from Wicket 7 to Wicket 9.
>
> There is one class with a heavy code smell: it relies on a Wicket
> internal realization. (Which promptly doesn't work any more in Wicket
> 9...) This email is part of my search for a better realization method.
>
> The use case:
> -- There is a form with lots of submit buttons.
> -- One button realizes a "show as pdf" functionality.
> -- The PDF shall be shown in a new tab.
> -- It shall be possible to use the button while still working on
> the form. This is a form submit -- the PDF shall show the then
> current content of the page. (Validation is not an issue in
> this case, the submit and form processing will succeed.)
> -- After showing a PDF representation of the form, it shall be
> possible to use the other buttons in this form, which are part of
> the HTML sequence of pages.
>
> I cannot use Javascript popups, as too many browsers block them. (In
> fact, my own developer browser blocks them. ;-)) So I need to have the
> following functionality for this button:
> -- Before the submit, a target attribute "_blank" get's added to the
> form.
> -- The form is submittet, by this button. (I.e., its onSubmit() must
> be called.)
> -- Afterwards, the target attribute is deleted from the form.
>
> The previous programmer in this project simply copied the Javascript
> code for an AjaxSubmitLink from Wicket 7 and enriched it with
> adding/deleting the form attribute. Not the smartest move, indeed; but
> it was working all this time
>
> I'm looking for best practice to achieve that functionality with the
> available Wicket API. I.e., I want to prepend and append Javascript to
> the Wicket-supplied submit functionality of a button or ajax submit
> action. I have looked at Javadoc and source code of the following
> classes (and their superclasses) and didn't found any hook/method
> where I can achieve my desired result:
> -- AjaxRequestAttributes: No methods to prepend/append JS code.
>
Actually this is the one you need ^^
atrts.getAjaxCallListeners().add(new
AjaxCallListener().onBefore("...").onComplete("..."));
see also onBeforeSend() and onAfter()
> -- AjaxSubmitLink: No methods to manipulate the emmitted JS code.
> -- AjaxFormSubmitBehavior: No methods to manipulate the emmitted JS
> code.
> -- Button: has getOnClickScript(), but this is empty.
> -- AjaxButton: doesn't redefine getOnClickScript(), so no gain to be
> get here either.
>
> FWIW: The application uses getCspSettings().blocking().disabled().
> There's too much JS code in HTML that I don't want to touch in this
> round of update; that's a step after the Wicket 9 migration. Thus,
> currently I have no qualms to add JS code to HTML "onsubmit"
> attributes if that's the way to go at the moment.
>
> I'm looking for something like #prependJavaScript() and
> #appendJavaScript() in AjaxRequestTarget -- but not in the response
> handling, instead for the code that triggers the click event.
>
> tl;dr: How can I specify JS code that's executed before and after a
> (specific) button or ajax submit of a form?
>
> Here's hoping for some tips,
>
> Joachim
>
> --
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> Joachim Schrod, Roedermark, Germany
> Email: [email protected]
>
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