[Webkit-unassigned] [Bug 237190] New: Feature Request: An event on <input type=file> for when HEIC to JPEG conversion starts

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=237190

            Bug ID: 237190
           Summary: Feature Request: An event on <input type=file> for
                    when HEIC to JPEG conversion starts
           Product: WebKit
           Version: Safari 15
          Hardware: Mac (Intel)
                OS: macOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Forms
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: martin_petrov at me.com
                CC: cdumez at apple.com, wenson_hsieh at apple.com

<input type="file" accept="image/jpeg" multiple>

The automatic conversion of multiple HEIC files to JPEG is slow on older machines. I would like to display a loader. I can already show a loader when the user clicks the input, and hide it when the "change" event fires. However the "change" event doesn't fire when canceling the "Choose files" dialog.

A solution could be an extra event that fires immediately after files are chosen (before conversion), or alternatively, an event for the Cancel action.

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