Gravity Wiz // Gravity Forms // Choice Counter

gw-gravity-forms-choice-counter.php

<?php
/**
 * WARNING! THIS SNIPPET MAY BE OUTDATED.
 * The latest version of this snippet can be found in the Gravity Wiz Snippet Library:
 * https://github.com/gravitywiz/snippet-library/blob/master/gravity-forms/gw-choice-counter.php
 */
/**
 * Gravity Wiz // Gravity Forms // Choice Counter
 *
 * Get the total number of checkboxes checked or multi-select options selected. Useful when wanting to apply conditional
 * logic based on those totals.
 *
 * @version   1.0
 * @author    David Smith <david@gravitywiz.com>
 * @license   GPL-2.0+
 * @link      http://gravitywiz.com/
 */
class GW_Choice_Count {

	private static $is_script_output;

	function __construct( $args ) {

		$this->_args = wp_parse_args( $args, array(
			'form_id'          => false,
			'count_field_id'   => false,
			'choice_field_id'  => null,
			'choice_field_ids' => false
		) );

		if( isset( $this->_args['choice_field_id'] ) ) {
			$this->_args['choice_field_ids'] = array( $this->_args['choice_field_id'] );
		}

		add_filter( 'gform_pre_render',            array( $this, 'load_form_script' ), 10, 2 );
		add_action( 'gform_register_init_scripts', array( $this, 'add_init_script' ) );
		//add_action( 'gform_pre_validation',        array( $this, 'override_submitted_value') );

	}

	public function load_form_script( $form, $is_ajax_enabled ) {

		if( $this->is_applicable_form( $form ) && ! has_action( 'wp_footer', array( $this, 'output_script' ) ) ) {
			add_action( 'wp_footer', array( $this, 'output_script' ) );
			add_action( 'gform_preview_footer', array( $this, 'output_script' ) );
		}

		return $form;
	}

	function output_script() {
		?>

		<script type="text/javascript">

			( function( $ ) {

				window.GWChoiceCount = function( args ) {

					var self = this;

					// Copy all args to current object: formId, fieldId.
					for ( prop in args ) {
						if ( args.hasOwnProperty( prop ) ) {
							self[ prop ] = args[prop];
						}
					}

					self.init = function() {

						for( var i = 0; i < self.choiceFieldIds.length; i++ ) {

							var choiceFieldId = self.choiceFieldIds[ i ],
								$choiceField  = $( '#input_' + self.formId + '_' + choiceFieldId );

							if ( self.isCheckboxField( $choiceField ) ) {
								$choiceField.find( 'input[type="checkbox"]' ).click( function() {
									self.updateChoiceCount( self.formId, self.choiceFieldIds, self.countFieldId );
								} );
							} else {
								$choiceField.change( function() {
									self.updateChoiceCount( self.formId, self.choiceFieldIds, self.countFieldId );
								} );
							}

						}

						self.updateChoiceCount( self.formId, self.choiceFieldIds, self.countFieldId );

					};

					self.isCheckboxField = function( $field ) {
						return Boolean( $field.find( 'input[type="checkbox"]' ).length );
					}

					self.updateChoiceCount = function( formId, choiceFieldIds, countFieldId ) {

						var countField = $( '#input_' + formId + '_' + countFieldId ),
							count      = 0;

						for ( var i = 0; i < choiceFieldIds.length; i++ ) {

							var $choiceField = $( '#input_' + formId + '_' + choiceFieldIds[ i ] );
							if ( self.isCheckboxField( $choiceField ) ) {
								count += $choiceField.find( 'input[type="checkbox"]:checked' ).not(' #choice_' + choiceFieldIds[ i ] + '_select_all').length;
							} else {
								count += $choiceField.find( 'option:selected' ).length;
							}

						}

						if( parseInt( countField.val() ) != parseInt( count ) ) {
							countField.val( count ).change();
						}

					};

					self.init();

				}

			} )( jQuery );

		</script>

		<?php
		self::$is_script_output = true;
	}

	function add_init_script( $form ) {

		if( ! $this->is_applicable_form( $form['id'] ) )
			return;

		$args = array(
			'formId'           => $this->_args['form_id'],
			'countFieldId'     => $this->_args['count_field_id'],
			'choiceFieldIds' => $this->_args['choice_field_ids']
		);

		$script = 'new GWChoiceCount( ' . json_encode( $args ) . ' );';
		$slug = implode( '_', array( 'gw_choice_count', $this->_args['form_id'], $this->_args['count_field_id'] ) );

		GFFormDisplay::add_init_script( $this->_args['form_id'], $slug, GFFormDisplay::ON_PAGE_RENDER, $script );

		return;
	}

	function override_submitted_value( $form ) {
		//$_POST["input_{$this->count_field_id}"] = $day_count;
		return $form;
	}

	public function is_applicable_form( $form ) {

		$form_id = isset( $form['id'] ) ? $form['id'] : $form;

		return empty( $this->_args['form_id'] ) || $form_id == $this->_args['form_id'];
	}

	public function is_ajax_submission( $form_id, $is_ajax_enabled ) {
		return isset( GFFormDisplay::$submission[ $form_id ] ) && $is_ajax_enabled;
	}

}

# Configuration

new GW_Choice_Count( array(
	'form_id'          => 123,          // The ID of your form.
	'count_field_id'   => 4,            // Any Number field on your form in which the number of checked checkboxes should be dynamically populated; you can configure conditional logic based on the value of this field.
	'choice_field_ids' => array( 5, 6 ) // Any array of Checkbox or Multi-select field IDs which should be counted.
) );

👉 This Gist has been migrated to the Gravity Wiz Snippet Library:

https://github.com/gravitywiz/snippet-library/blob/master/gravity-forms/gw-choice-counter.php