Reply To: Frontend form file upload validation

• James

• July 28, 2016 at 1:12 pm

Hi @gregor

I can reproduce it now. It seems that the basic uploader doesn’t check the file type. As a workaround, you can try the following code:

add_filter('acf/validate_value/type=file', 'my_acf_validate_value', 10, 4);

function my_acf_validate_value( $valid, $value, $field, $input ){
	
	// bail early if value is already invalid
	if( !$valid ) {
		
		return $valid;
		
	}
    
    // Get the allowed types and store it in an array
    $allowed_types = explode(',', trim($field['mime_types']));
    
    // Get the current file extension
    $file_extension = pathinfo($value)['extension'];
    
    // Check if the current file extension is allowed or not
    if( !in_array($file_extension, $allowed_types) ){
        $valid = 'This file type is not allowed';
    }

	// return
	return $valid;
		
}

If you want, you can also open a new ticket so this issue can be passed directly to the plugin author? You can open a new ticket here: https://support.advancedcustomfields.com/new-ticket.

I hope this helps 🙂