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.
-- 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
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Joachim Schrod, Roedermark, Germany
Email: jsch...@acm.org
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