Filter commas and semicolons to avoid being used in a single text line field

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1

Hello,

I saw the piece of code below in this forum (Filtering a specific field [RESOLVED] - #9 by chrishajer). I believe I need a slight modification to this filter, but was unable to modify it properly.

I have 3 single line fields (not name fields) in a specific form (form id 136). In these fields, I want people to be unable to write commas or semicolons. If they write a name containing this kind of punctuation, I need the form to display an error, asking the user to fix the input.

Example of correct input: John Doe
Incorrect input: Doe, John
Other incorrect input: Doe, John; Doe, Jane

What modifications would be necessary to accomplish this?

add_filter( 'gform_field_validation_136', 'gf_validate_name', 10, 4 );
function gf_validate_name( $result, $value, $form, $field ) {
	if ( $field->type != 'name' ) {
		return $result;
	}
	GFCommon::log_debug( __METHOD__ . '(): Name values => ' . print_r( $value, true ) );

	if ( $result['is_valid'] ) {
		foreach ( $value as $input ) {
			if ( ! empty ( $input ) && ! preg_match( '/^[\p{L} ]+$/u', $input ) ) {
				$result['is_valid'] = false;
				$result['message'] = 'Sorry, your name must not contain commas or semicolons';
			}
		}
	}
	return $result;
}
2

The following should do the job:

add_filter( 'gform_field_validation', function ( $result, $value, $form, $field ) {
    GFCommon::log_debug( __METHOD__ . '(): Running...' );
    // Only for Single Line Text
    if ( $field->type == 'text' ) {
 
        if ( $result['is_valid'] ) {
 
            if ( strpos( $value, ',' ) !== false  || strpos( $value, ';' ) !== false ) {
                GFCommon::log_debug( __METHOD__ . '(): Not allowed character detected: ' . $value );
                $result['is_valid'] = false;
                $result['message']  = 'Sorry, you used a not allowed character.';
            }
        }
 
    }
 
    return $result;
}, 10, 4 );
1 Like
3

Hi Samuel. Thank you, it worked perfectly.
Another doubt though: is there a way to use this same filter for 3 specific fields in this form, and 3 more fields in another form?
I know I can specify add_filter to one specific field using something like “gform_field_validation_136_11”. But if I had two more fields, 16 and 18, and another form with 3 other fields? In such case, do I have to add a unique filter to each field (copying and pasting this code multiple times, changing only form and field ID), or is there a way to use one filter for multiple, specific fields?
I can’t just assign this behavior to all fields in form 136, because there are other text fields that could use commas and semicolons.

4

Hi Eduardo. There are several approaches to this. You can use the same function, with multiple add_filter lines, each filter line targeting a different form and field. You will need to change from an anonymous function to a named function, like this:

add_filter( 'gform_field_validation_136_11', 'prevent_commas', 10, 4 );
add_filter( 'gform_field_validation_136_16', 'prevent_commas', 10, 4 );
add_filter( 'gform_field_validation_136_18', 'prevent_commas', 10, 4 );
add_filter( 'gform_field_validation_119_14', 'prevent_commas', 10, 4 );
add_filter( 'gform_field_validation_119_10', 'prevent_commas', 10, 4 );
add_filter( 'gform_field_validation_119_17', 'prevent_commas', 10, 4 );
function prevent_commas( $result, $value, $form, $field ) {
    GFCommon::log_debug( __METHOD__ . '(): Running...' );
    // Only for Single Line Text
    if ( $field->type == 'text' ) {
 
        if ( $result['is_valid'] ) {
 
            if ( strpos( $value, ',' ) !== false  || strpos( $value, ';' ) !== false ) {
                GFCommon::log_debug( __METHOD__ . '(): Not allowed character detected: ' . $value );
                $result['is_valid'] = false;
                $result['message']  = 'Sorry, you used a not allowed character.';
            }
        }
    }
    return $result;
}

Another approach, if this becomes too much to manage, would be to give the field where you want to prevent commas and semicolons a Custom CSS Class name and then use the original code to target fields with that class (rather than the field type). Let us know if this method I shared with multiple add_filter lines does not work for you.

5

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