Timeline for How do I add an #ajax callback to File field form widget?

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when toggle format	what		by	license	comment
Nov 14, 2016 at 20:33	comment	added	user3421014		Can I add additional submit handler for Submit file button and somehow to update another field with javascript ?
Nov 14, 2016 at 16:58	comment	added	Beebee		Oh and you should probably use `hook_field_widget_form_alter` to do the above (comment) instead of plain hook_form_alter
S Nov 14, 2016 at 16:56	history	edited	Beebee	CC BY-SA 3.0	Further edits to improve the meaning
S Nov 14, 2016 at 16:56	history	suggested	acrosman	CC BY-SA 3.0	Copy edits for clarity.
Nov 14, 2016 at 16:51	comment	added	Beebee		there's no `change` method. Perhaps you meant to put that as `event`? Also, as to your main question, take a look at the core file module (file.field.inc specifically). There's a `#process` function that gets added on the file widget, which changes the #ajax array's values, effectively after everytime you upload an image. So you may need to add your own `#process` function into that array, and add your `#ajax` there. I've never done this before though. Hence just commenting.
Nov 14, 2016 at 16:30	review	Suggested edits
S Nov 14, 2016 at 16:56
Nov 14, 2016 at 13:49	history	asked	user3421014	CC BY-SA 3.0