[webkit-gtk] Ignoring form submission doesn't work in 2.14

[Carlos Alberto Lopez Perez]

On 13/01/17 14:10, Vasiliy Faronov wrote:
> Hi,
> 
> I have a Python program that uses WebKitGTK+ (via
> GObject-Introspection) to create a WebView, populate it with an HTML
> form, and handle submissions of that form.
> 
> See: https://gist.github.com/vfaronov/f1c1faa969c58b5990d02f5d9890b180
> 
> After my Python code has handled the submission, I want WebKit to stop
> its further processing: it must *not* navigate away to the form's
> target.
> 
> To accomplish this, I keep references to the submission requests, as
> suggested by the docs for the submit-form signal [1]. This works for
> me with WebKitGTK+ 2.10 and 2.12.
> 
> But with 2.14.2, the WebView "freezes" after my on_submit_form
> callback returns. That is, after clicking the "Submit" button, it
> stays visually pressed down, and I can no longer scroll the view or
> type in the input field. However, if I click the "Submit" button again
> in this "frozen" state, my callback is called again and produces the
> same output. And if I right-click in the WebView, the context menu
> still pops up.
> 
> Of course, if I don't keep the reference -- that is, if I remove
> "refs.append(request)" -- then the WebView navigates away to the form
> target (about:blank), which is what I want to *prevent*.
> 
> Any idea why my code breaks with 2.14? Maybe there's a better way to
> do what I want?
> 
> Thank you.
> 
> [1] https://webkitgtk.org/reference/webkit2gtk/stable/WebKitWebView.html#WebKitWebView-submit-form
> 
> 

It seems that the accelerated compositing mode (that we enabled by
default on 2.14.x) is triggering this issue (no idea why).

Try to export this environment variable before running you program:

export WEBKIT_DISABLE_COMPOSITING_MODE=1

With it, I'm not longer able to reproduce the freeze on the UI.

Regards.

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 883 bytes
Desc: OpenPGP digital signature
URL: <https://lists.webkit.org/pipermail/webkit-gtk/attachments/20170117/3ef4c98b/attachment.sig>