Conditional “multiple” attribute in <input type=“file”> with AngularJS

Question

I need an upload form field that may or may not allow the user to select more than one file.

I know I can do something like:

Answer 1

Try using ng-attr-

 ng-attr-class="{{someBoolean && 'class-when-true' || 'class-when-false' }}"

If you prefix any attribute with ng-attr-, then the compiler will strip the prefix, and add the attribute with its value bound to the result of the angular expression from the original attribute value.