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<?php
add_action( 'gform_editor_js', 'field_settings_js' );
public function field_settings_js() {
    ?>

    <script type="text/javascript">

        (function($) {
            $(document).ready(function(){
                for( i in fieldSettings ) {
                    fieldSettings[i] += ', .my-custom-field-setting';
                }
            });
        })(jQuery);

    </script>

    <?php
}

<?php
add_action( 'gform_editor_js', 'field_settings_js' );
public function field_settings_js() {
    ?>

<script type="text/javascript">

    (function($) {

        $(document).bind( 'gform_load_field_settings', function( event, field, form ) {

            // populates the stored value from the field back into the setting when the field settings are loaded
            $( '#my-custom-setting' ).attr( 'checked', field['myCustomSetting'] == true );

            // if our desired condition is met, we show the field setting; otherwise, hide it
            if( GetInputType( field ) == 'desired_field_type' ) {
                $( '.my-custom-field-setting' ).show();
            } else {
                $( '.my-custom-field-setting' ).hide();
            }

        } );

    })(jQuery);

</script>

<?php
}

<?php

// Folder & Filename
// gp-sample-plugin/gp-sample-plugin.php

// Class name
// GP_Sample_Plugin

// Class name full example:
class GP_Sample_Plugin extends GWPerk { }

<?php
/**
* Plugin Name: GP Sample Perk
* Description: A description of what this perk does.
* Plugin URI: http://gravitywiz.com/documentation/gp-sample-perk/
* Version: 1.2
* Author: Gravity Wiz
* Author URI: http://gravitywiz.com/
* License: GPL2
* Perk: True
*/

if( ! class_exists( 'GWPerk' ) ) {
    return;
}

class GP_Sample_Perk extends GWPerk {

    public $version = '1.2'
    public $min_gravity_perks_version = '1.0';
    public $min_gravity_forms_version = '1.8';
    public $min_wp_version = '3.7';

    private static $instance = null;

    public static function get_instance( $perk_file ) {
        if( self::$instance == null ) {
            self::$instance = new self( $perk_file );
        }
        return self::$instance;
    }
    
    function init() {
        
        // start coding!

    }
    
    function documentation() {
        return array(
            'type' => 'url',
            'value' => 'http://gravitywiz.com/documentation/gp-sample-perk/'
        );
    }
    
}

<?php
public static function dynamic_setting_actions( $position, $form_id ) {
    $action = current_filter() . '_' . $position;
    if( did_action( $action ) < 1 ) {
        do_action( current_filter() . '_' . $position, $form_id );
        //echo current_filter() . '_' . $position . '<br />';
    }
}

<?php
add_action( 'gperk_field_settings', 'my_custom_setting' ) 
function my_custom_setting() {
    ?>

    <li class="my-custom-field-setting field_setting">

        <input type="checkbox" id="my-custom-setting" value="1" onclick="SetFieldProperty( 'myCustomSetting', this.checked);">

        <label class="inline" for="my-custom-setting">
            _e( 'My Custom Setting Label' )
            <?php gform_tooltip( 'my-custom-setting-toolip' ); ?>
        </label>

    </li>

    <?php
}