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In a form which contains only a
<input id="fileInput" name="BugReport" type="file" />
input field, I would like to disable the Submit button if the file input is empty (no file was chosen yet). Is there a recommended way to do this?
Add the
requiredattribute to the input. It’ll only work in browsers that support it, so you should have a JavaScript alternative (<form onSubmit="if(document.getElementById('fileinput').value == '') return false;">or something along those lines).