This topic contains 1 reply, has 2 voices, and was last updated by 
Anh Tran 1 month ago.
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Hi,
I’m require my file upload to only allow PDFs. I have used the following code but it does not work. Please help me point out how to do it.
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Hi Ranadeep,
The extension validation is an add-on for the jQuery validation library and it’s not included in Meta Box.
In order to use it, please download the
extension.jsfile from Github:https://github.com/jquery-validation/jquery-validation/blob/master/src/additional/extension.js
And enqueue it like this:
add_action( 'rwmb_enqueue_scripts', function() { wp_enqueue_script( 'jquery-validation-extension', 'url to the js file', '', '', true ); }Then you can use the extension rule.
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