gravityforms-multiple-form-instances.php

<?php
/**
 * Plugin Name: Gravity Forms: Multiple Form Instances
 * Description: Allows multiple instances of the same form to be run on a single page when using AJAX.
 * Author: tyxla
 * Author URI: http://marinatanasov.com/
 * Plugin URI: https://github.com/tyxla/Gravity-Forms-Multiple-Form-Instances
 * Version: 1.1.2
 * License: GPL2
 * Requires at least: 3.0.1
 * Tested up to: 4.5
 */

/**
 * The main plugin class.
 */
class Gravity_Forms_Multiple_Form_Instances {

	/**
	 * Constructor.
	 *
	 * Used to initialize the plugin and hook the related functionality.
	 *
	 * @access public
	 */
	public function __construct() {
		// hook the HTML ID string find & replace functionality
		add_filter( 'gform_get_form_filter', array( $this, 'gform_get_form_filter' ), 10, 2 );
		add_filter( 'gform_confirmation', array( $this, 'gform_get_form_filter' ), 10, 2 );
	}

	/**
	 * Replaces all occurences of the form ID with a new, unique ID.
	 *
	 * This is where the magic happens.
	 *
	 * @access public
	 *
	 * @param string $form_string The form HTML string.
	 * @param array $form Array with the form settings.
	 * @return string $form_string The modified form HTML string.
	 */
	public function gform_get_form_filter( $form_string, $form ) {
		// if form has been submitted, use the submitted ID, otherwise generate a new unique ID
		if ( isset( $_POST['gform_random_id'] ) ) {
			$random_id = absint( $_POST['gform_random_id'] ); // Input var okay.
		} else {
			$random_id = mt_rand();
		}

		// this is where we keep our unique ID
		$hidden_field = "<input type='hidden' name='gform_field_values'";

		// define all occurences of the original form ID that wont hurt the form input
		$strings = array(
			' gform_wrapper'                                                   => ' gform_wrapper gform_wrapper_original_id_' . $form['id'],
			"for='choice_"                                                      => "for='choice_" . $random_id . '_',
			"id='label_"                                                        => "id='label_" . $random_id . '_',
			"'gform_wrapper_" . $form['id'] . "'"                               => "'gform_wrapper_" . $random_id . "'",
			"'gf_" . $form['id'] . "'"                                          => "'gf_" . $random_id . "'",
			"'gform_" . $form['id'] . "'"                                       => "'gform_" . $random_id . "'",
			"'gform_ajax_frame_" . $form['id'] . "'"                            => "'gform_ajax_frame_" . $random_id . "'",
			'#gf_' . $form['id'] . "'"                                          => '#gf_' . $random_id . "'",
			"'gform_fields_" . $form['id'] . "'"                                => "'gform_fields_" . $random_id . "'",
			"id='field_" . $form['id'] . '_'                                    => "id='field_" . $random_id . '_',
			"for='input_" . $form['id'] . '_'                                   => "for='input_" . $random_id . '_',
			"id='input_" . $form['id'] . '_'                                    => "id='input_" . $random_id . '_',
			"id='choice_" . $form['id'] . '_'                                   => "id='choice_" . $random_id . '_',
			"'gform_submit_button_" . $form['id'] . "'"                         => "'gform_submit_button_" . $random_id . "'",
			'"gf_submitting_' . $form['id'] . '"'                               => '"gf_submitting_' . $random_id . '"',
			"'gf_submitting_" . $form['id'] . "'"                               => "'gf_submitting_" . $random_id . "'",
			'#gform_ajax_frame_' . $form['id']                                  => '#gform_ajax_frame_' . $random_id,
			'#gform_wrapper_' . $form['id']                                     => '#gform_wrapper_' . $random_id,
			'#gform_' . $form['id']                                             => '#gform_' . $random_id,
			"trigger('gform_post_render', [" . $form['id']                      => "trigger('gform_post_render', [" . $random_id,
			'gformInitSpinner( ' . $form['id'] . ','                            => 'gformInitSpinner( ' . $random_id . ',',
			"trigger('gform_page_loaded', [" . $form['id']                      => "trigger('gform_page_loaded', [" . $random_id,
			"'gform_confirmation_loaded', [" . $form['id'] . ']'                => "'gform_confirmation_loaded', [" . $random_id . ']',
			'gf_apply_rules(' . $form['id'] . ','                               => 'gf_apply_rules(' . $random_id . ',',
			'gform_confirmation_wrapper_' . $form['id']                         => 'gform_confirmation_wrapper_' . $random_id,
			'gforms_confirmation_message_' . $form['id']                        => 'gforms_confirmation_message_' . $random_id,
			'gform_confirmation_message_' . $form['id']                         => 'gform_confirmation_message_' . $random_id,
			'if(formId == ' . $form['id'] . ')'                                 => 'if(formId == ' . $random_id . ')',
			"window['gf_form_conditional_logic'][" . $form['id'] . ']'          => "window['gf_form_conditional_logic'][" . $random_id . ']',
			"trigger('gform_post_conditional_logic', [" . $form['id'] . ','     => "trigger('gform_post_conditional_logic', [" . $random_id . ',',
			'gformShowPasswordStrength("input_' . $form['id'] . '_'             => 'gformShowPasswordStrength("input_' . $random_id . '_',
			"gformInitChosenFields('#input_" . $form['id'] . '_'                => "gformInitChosenFields('#input_" . $random_id . '_',
			"jQuery('#input_" . $form['id'] . '_'                               => "jQuery('#input_" . $random_id . '_',
			'gforms_calendar_icon_input_' . $form['id'] . '_'                   => 'gforms_calendar_icon_input_' . $random_id . '_',
			"id='ginput_base_price_" . $form['id'] . '_'                        => "id='ginput_base_price_" . $random_id . '_',
			"id='ginput_quantity_" . $form['id'] . '_'                          => "id='ginput_quantity_" . $random_id . '_',
			'gfield_price_' . $form['id'] . '_'                                 => 'gfield_price_' . $random_id . '_',
			'gfield_quantity_' . $form['id'] . '_'                              => 'gfield_quantity_' . $random_id . '_',
			'gfield_product_' . $form['id'] . '_'                               => 'gfield_product_' . $random_id . '_',
			'ginput_total_' . $form['id']                                       => 'ginput_total_' . $random_id,
			'GFCalc(' . $form['id'] . ','                                       => 'GFCalc(' . $random_id . ',',
			'gf_global["number_formats"][' . $form['id'] . ']'                  => 'gf_global["number_formats"][' . $random_id . ']',
			'gform_next_button_' . $form['id'] . '_'                            => 'gform_next_button_' . $random_id . '_',
			$hidden_field                                                       => "<input type='hidden' name='gform_random_id' value='" . $random_id . "' />" . $hidden_field,
		);

		// allow addons & plugins to add additional find & replace strings
		$strings = apply_filters( 'gform_multiple_instances_strings', $strings, $form['id'], $random_id );

		// replace all occurences with the new unique ID
		foreach ( $strings as $find => $replace ) {
			$form_string = str_replace( $find, $replace, $form_string );
		}

		return $form_string;
	}

}

// initialize the plugin
global $gravity_forms_multiple_form_instances;
$gravity_forms_multiple_form_instances = new Gravity_Forms_Multiple_Form_Instances();