File upload: Confirm file upload to screenreaders. #4415
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Description
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File upload confirms files to screenreaders. Closes #4232. Now file input will tell screenreaders how many files were uploaded and their names on upload.
Additional information
Based off of Amy's work in #4406. By default the file input will say
No file(s) uploaded. And on file upload it will change toYou have selected {{ NUMBER_OF_FILES }} files: {{ FILES_LISTED }}. When a user clears files, it'll go back to the default message.Before you hit Submit, make sure you’ve done whichever of these applies to you:
npm testand make sure the tests for the files you have changed have passed.