Hello,
I am implementing a 'double-submit' prevention strategy by pre-pending the
relevant wicket component's 'onclick' handler with "this.disabled=true".
This works fine for components that are translated as normal HTML buttons ie
<input type='button'> and that form submission only involves javascript in
the onclick handler (eg using AjaxButton):
Eg,
<input type="button" onclick="this.disabled =
true;wicketShow('ajaxIndicatore2');......bind(this));;; return false;"
value="Change password" name="submitButton" id="submitButtoned"/>
(NB I have removed the bulk of the ajax javascript code in the onclick
handler for clarity).
When uploading a file and using the wicket UploadProgressBar class, there's
javascript placed in the HTML form's onsubmit handler. This handler is ONLY
fired if you use a HTML submit button <input type='submit'>. Using a
standard HTML button and using it's onclick handler to submit the form does
NOT call the form's onsubmit handler before the form is posted to the
server. This is expected browser behaviour as far as i can tell.
Eg,
<input type='button' onclick='this.form.submit()'/>
...submits the form, but the form's onsubmit handler does not fire.
My problem comes when the following happens:
<input type='submit' onclick='this.disabled=true'/>
...this disables the submit button and calls the form's onsubmit handler (as
evidenced by placing javascript alert('here') messages in the generated HTML
onsubmit handler) BUT it cancels the posting of the form and instead the
page reloads, as far as i can tell. According to various web sites, it's
expected behavour that disabling a submit button cancels the form being
posting.
So, if i want the form's onsubmit handler to fire and allow the
UploadProgressBar to work, how am I to prevent a user from double-clicking
the submit button when uploading a file? Hopefully, I am missing something
obvious...
Kinds regards
Jeremy
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