[Webkit-unassigned] [Bug 242314] New: Double clicking submit button causes forms to be submitted twice.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=242314

            Bug ID: 242314
           Summary: Double clicking submit button causes forms to be
                    submitted twice.
           Product: WebKit
           Version: Safari 15
          Hardware: Mac (Apple Silicon)
                OS: macOS 12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Forms
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fraser at google.com
                CC: cdumez at apple.com, wenson_hsieh at apple.com

Fill out a form (ether GET or POST), press submit, and the results are sent to the server.  But if you double-click the submit button (as many people do), two separate requests are sent.  This simple bug is the source of a vast number of hard to reproduce glitches:
* doubled posts being submitted to forums.
* server-side race conditions which have caused data loss (even code written for a single user needs to be thread-safe).
* one-time actions that quietly succeed (first click) but a failure message is displayed to user (second click).
* add one thingmy to your shopping cart, get two.  Remove one, lose both.  (Great if you want pairs of everything.)
* order your two thingmys, and four arrive in the mail (along with two invoices).
Because of this bug, every form that performs an action needs to be wrapped in a JavaScript double-click trap, or else caught server-side (which involves logging requests and checking the log for a similar request in the past second).


Reproducible: Always

Steps to Reproduce:
Point Safari or Chrome at a form.  In a terminal window, "tail --follow access.log".  Double click (or triple click) the submit button.

Actual Results:  
Webkit browsers will submit the form as many times as the mouse was clicked.

Expected Results:  
Webkit browsers should not submit a form a second time within the double-click time frame.  Webkit browsers perform properly on links; double-clicking a link does not generate two requests.

Interestingly, I filed this exact bug against Mozilla 19 years ago (#238159).  At the time, Mozilla was the only browser exhibiting this bug, IE 5, Opera 7, and Netscape 4 were not affected.  Now that Mozilla has finally been fixed, Webkit has started doing the same thing.

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