Custom formula field (Square root)

forminator-custom-formula-field.php

<?php
/**
 * Plugin Name: [Forminator Pro] - Custom formula field
 * Description: [Forminator Pro] - Custom formula field (Square root) - 1156977754278478
 * Author: Thobk @ WPMUDEV
 * Author URI: https://premium.wpmudev.org
 * License: GPLv2 or later
 */
if ( ! defined( 'ABSPATH' ) ) { exit; } elseif ( defined( 'WP_CLI' ) && WP_CLI ) { return; }

add_action( 'after_setup_theme', 'wpmudev_forminator_custom_formula_field_func', 100 );

function wpmudev_forminator_custom_formula_field_func() {
	if ( defined('FORMINATOR_PRO') && class_exists( 'Forminator' ) ) {
		class WPMUDEV_FM_Custom_Square_Field{
			public function __construct(){
				add_action( 'wp_footer', array( $this, 'custom_formula_field' ), 21 );
				add_action( 'wp_head', array( $this, 'custom_css'), 10, 21 );
				add_filter( 'forminator_field_create_input', array( $this, 'allow_float_number_field' ), 10, 2 );

				// add_action( 'forminator_cform_post_message', array( $this, 'trigger_hidden_filter' ) );
			}

			public function custom_css(){
				echo '<style>
					.wpmudev-hidden{
						display:none;
					}
				</style>';
			}

			public function trigger_hidden_filter(){
				add_action( 'forminator_before_wrapper_markup', array( $this, 'add_custom_class_for_hidden_field' ), 10, 2 );
			}
			public function add_custom_class_for_hidden_field( $html, $wrapper ){
				// Check if the field type is hidden
				if ( isset( $wrapper['fields'] ) && "hidden" === $wrapper['fields'][0]['type'] ) {
					if( ! empty( $wrapper['fields'][0]['custom-class'] ) ){
						$html = str_replace( 'class="', 'class="'. $wrapper['fields'][0]['custom-class'] .' ', $html );
					}
				}
				return $html;
			}

			public function allow_float_number_field( $html, $attr ){
				if( ! empty( $attr['pattern'] ) && '[0-9]*' === $attr['pattern'] ){
					if( ( isset( $attr['min'] ) && is_float( $attr['min'] + 0 ) ) || ( isset( $attr['max'] ) && is_float( $attr['max'] + 0 ) ) ){
						$attr['pattern'] = '[+-]?([0-9]*[.])?[0-9]+';
						$html = str_replace('pattern="[0-9]*"', '', $html);
					}
				}
				return $html;
			}

			public function custom_formula_field(){
				echo "<script type='text/javascript'>(function ($, document, window) {
					'use strict';
					$(function () {
						if (typeof ($.fn.forminatorLoader) === 'undefined') {
							// nothing to do here
						} else {
							$(document).on('after.load.forminator', function(e, form_id){
								let _form = $('#forminator-module-'+ form_id);
								if( _form.length && _form.hasClass('forminator-custom-form') ){
									let _sqrt_field = _form.find('.wpmudev-sqrt-field');
									if( _sqrt_field.length ){
										_form.find('.wpmudev-hidden').parent().hide();
										_sqrt_field.find('input,select').on('change', function(){
											let _parent = $(this).closest('.wpmudev-sqrt-field'),
												_number = _form.find('.wpmudev-'+ _parent.attr('id'));
											if( _number.length ){
												var _val = $(this).data('calculation');
												if( undefined === _val ){
													_val = $(this).val();
												}

												_val = Math.sqrt( _val );

												if( _val % 1 !== 0 ){
													_val = _val.toFixed(2);
												}

												_number.find('input').val( _val ).trigger('change');
											}
										});
									}
								}
							});
						}
					});
				}(window.jQuery, document, window))</script>";
			}
		}

		$run = new WPMUDEV_FM_Custom_Square_Field;
	}
}