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<?php
/**
 * Gravity Wiz // Gravity Forms // Give First Validation Error Focus
 * http://gravitywiz.com/
 *
 * Plugin Name:  Gravity Forms First Error Focus
 * Plugin URI:   https://gravitywiz.com/make-gravity-forms-validation-errors-mobile-friendlyer/
 * Description:  Automatically focus (and scroll) to the first field with a validation error.
 * Author:       Gravity Wiz
 * Version:      1.1
 * Author URI:   http://gravitywiz.com/
 */
add_filter( 'gform_pre_render', 'gw_first_error_focus' );
function gw_first_error_focus( $form ) {
	if ( defined( 'DOING_AJAX'  ) && DOING_AJAX ) {
		return $form;
	}
	add_filter( 'gform_confirmation_anchor_' . $form['id'], '__return_false' );
	?>
	<script type="text/javascript">
		if( window['jQuery'] ) {
			( function( $ ) {
				$( document ).on( 'gform_post_render', function() {
					// AJAX-enabled forms will call gform_post_render again when rendering new pages or validation errors.
					// We need to reset our flag so that we can still do our focus action when the form conditional logic
					// has been re-evaluated.
					window['gwfef'] = false;
					gwFirstErrorFocus();
				} );
				$( document ).on( 'gform_post_conditional_logic', function( event, formId, fields, isInit ) {
					if( ! window['gwfef'] && fields === null && isInit === true ) {
						gwFirstErrorFocus();
						window['gwfef'] = true;
					}
				} );
				function gwFirstErrorFocus() {
					var $firstError = $( 'li.gfield.gfield_error:first' );
					if( $firstError.length > 0 ) {
						$firstError.find( 'input, select, textarea' ).eq( 0 ).focus();
						document.body.scrollTop = $firstError.offset().top;
					}
				}
			} )( jQuery );
		}
	</script>
	<?php
	return $form;
}