Reply To: Frontend form file upload validation

• mkmedia

• December 8, 2016 at 8:45 pm

Hi,

For those who comes across this and not being able to update/edit posts you can add if(is_numeric($value)) { to the code to check if the field is already stored like so:

At least that seems to work for me.

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

function my_acf_validate_value_file( $valid, $value, $field, $input ){

	if(is_numeric($value)) {
		return true;
	} else {
	
		// 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;
	}
		
} 

Kind regards
Henrik