Gravity Forms: Require minimum/maximum characters in input field

Question

is it possible to limit the characters in an input field for every form we have? I need an input field with exact 5 numbers (zip field).

I found this solution: (full code here: https://gravitywiz.com/require-minimum-character-limit-gravity-forms/)

new GW_Minimum_Characters( array( 
    'form_id' => 524,
    'field_id' => 1,
    'min_chars' => 4,
    'max_chars' => 5,
    'min_validation_message' => __( 'Oops! You need to enter at least %s characters.' ),
    'max_validation_message' => __( 'Oops! You can only enter %s characters.')
    ) 
);

The problem is, that we have dozens of forms and couldn't build a function for all of them ;) So we couldn't use the "form_id" and the "field_id".

Maybe there is a way to use a parameter name for the input field?

Answer 1

I had a similar issue where I needed to have minimum no. of characters for text fields and textarea. This setting had to be used in different forms and multiple fields therefore I could not add filters with pre-defined form ids and field ids.

What I did is that I created a new setting which was visible when editing a field and then I validated the submission. You can use the code below:

add_action( 'gform_field_standard_settings', 'minimum_field_setting', 10 );
add_action( 'gform_editor_js', 'editor_script' );
add_filter( 'gform_tooltips', 'add_encryption_tooltips' );
add_filter( 'gform_validation', 'general_validation' );

/**
 * Adds the Minimum Characters Field to Form Fields
 *
 * @param integer $position
 */
function minimum_field_setting( $position ) {

    //Position: Underneath Description TextArea
    if ( $position == 75 ) {
        ?>
        <li class="minlen_setting field_setting">
            <label for="field_minlen" class="section_label">
                <?php esc_html_e( 'Minimum Characters', 'gravityforms' ); ?>
                <?php gform_tooltip( 'form_field_minlen' ) ?>
            </label>
            <input type="number"
                   id="field_minlen"
                   onblur="SetFieldProperty('minLength', this.value);"
                   value=""
            />
        </li>
        <?php
    }
}

/**
 * Adds Javascript to Gravity Forms in order to render the new setting field in their appropriate field types
 */
function editor_script() {
    ?>
    <script type='text/javascript'>
        //Append field setting only to text and textarea fields
        jQuery.each(fieldSettings, function (index, value) {
            if (index === 'textarea' || index === 'text') {
                fieldSettings[index] += ", .minlen_setting";
            }
        });
        //binding to the load field settings event to initialize the checkbox
        jQuery(document).bind("gform_load_field_settings", function (event, field, form) {
            if (field.type === 'textarea' || field.type === 'text') {
                console.log(field);
                if (typeof field.minLength !== "undefined") {
                    jQuery("#field_minlen").attr("value", field.minLength);
                } else {
                    jQuery("#field_minlen").attr("value", '');
                }
            }
        });
    </script>
    <?php
}

/**
 * Add GF Tooltip for Minimum Length
 *
 * @param array $tooltips
 *
 * @return mixed
 */
function add_encryption_tooltips( $tooltips ) {
    $tooltips['form_field_minlen'] = "<h6>Minimum Length</h6>Minimum number of characters for this field";

    return $tooltips;
}

/**
 * Validate Form Submission
 *
 * @param array $validation_result
 *
 * @return mixed
 */
function general_validation( $validation_result ) {
    $form = $validation_result['form'];

    foreach ( $form['fields'] as &$field ) {
        if ( in_array( $field->type, [ 'text', 'textarea' ] ) && ! empty( $field->minLength ) ) {
            $input_name = 'input_' . $field->id;
            if ( isset( $_POST[ $input_name ] ) && $_POST[ $input_name ] != '' ) {
                if ( strlen( $_POST[ $input_name ] ) < (int) $field->minLength ) {
                    $field->failed_validation      = true;
                    $field->validation_message     = 'Field must contain at least ' . $field->minLength . ' characters';
                    $validation_result['is_valid'] = false;
                }
            }
        }
    }
    $validation_result['form'] = $form;

    return $validation_result;
}

You can change the setting from Minimum Length to Exact Length and then update the validation accordingly.