• bug report? no
• feature request? yes
• version: 2.4

Description

Even that Nette\Forms\Helpers::exportRules() generates rule for client-side mime type verification, it is not implemented in netteForms.js.

Steps To Reproduce

1. Add control: $form->addUpload('image')->addRule(Form::MIME_TYPE, 'jen jpg', 'image/jpeg')
2. Render control: <input n:name="image">
3. Click the image input and select non-jpeg file.
4. Click form's submit button. No client-side validation is made, instead backend takes action.