Conditional Logic Operator: “Does Not Contain”

Adds support for the “does not contain” conditional logic operator in Gravity Forms.

Instructions

Code

Filename: gw-conditional-logic-operator-does-not-contain.php

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<?php
/**
 * Gravity Wiz // Gravity Forms // Conditional Logic Operator: "Does Not Contain"
 *
 * Instruction Video: https://www.loom.com/share/8e1b27ec47b341dbb4f0da2bec6a960b
 *
 * Check if a source field value does NOT contain a specific substring using the "does not contain" conditional logic operator.
 *
 * Plugin Name:  GF Conditional Logic Operator: "Does Not Contain"
 * Plugin URI:   https://gravitywiz.com/
 * Description:  Adds support for the "does not contain" conditional logic operator in Gravity Forms.
 * Author:       Gravity Wiz
 * Version:      1.0
 * Author URI:   https://gravitywiz.com
 */
class GF_CLO_Does_Not_Contain {

	public function __construct() {
		add_action( 'init', array( $this, 'init' ) );
	}

	public function init() {

		add_filter( 'admin_footer', array( $this, 'output_admin_inline_script' ) );
		add_filter( 'gform_is_valid_conditional_logic_operator', array( $this, 'whitelist_operator' ), 10, 2 );
		add_filter( 'gpeu_field_filters_from_conditional_logic', array( $this, 'convert_conditional_logic_to_field_filters' ) );

		add_filter( 'gform_pre_render', array( $this, 'load_form_script' ), 10, 2 );
		add_filter( 'gform_register_init_scripts', array( $this, 'add_init_script' ), 10, 2 );
		add_filter( 'gform_is_value_match', array( $this, 'evaluate_operator' ), 10, 6 );

	}

	public function output_admin_inline_script() {
		if ( ! GFForms::get_page() && is_admin() && ! in_array( rgget( 'page' ), array( 'gp-email-users' ) ) ) {
			return;
		}
		?>
		<script>
			if ( window.gf_vars ) {
				gf_vars['does_not_contain'] = '<?php esc_html_e( 'does not contain' ); ?>';
			}

			gform.addFilter( 'gform_conditional_logic_operators', function( operators ) {
				// Injects our "does_not_contain" operator directly below the "contains" operator for logical ordering.
				operators = Object.fromEntries(
					Object.entries(operators).flatMap(([k, v]) =>
						k === "contains" ? [[k, v], ['does_not_contain', 'does not contain']] : [[k, v]]
					)
				);
				return operators;
			} );

			let origRuleNeedsTextValue = window.ruleNeedsTextValue;
			// Override the default GF function to add our custom operator.
			window.ruleNeedsTextValue = function( rule ) {
				let needsTextValue = origRuleNeedsTextValue( rule );
				return needsTextValue || rule.operator.indexOf( 'does_not_contain' ) !== -1;
			}
		</script>
		<?php
	}

	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;
	}

	public function output_script() {
		?>
		<script type="text/javascript">
			( function( $ ) {

				window.GWCLODoesNotContain = function( args ) {

					var self = this;

					for ( var prop in args ) {
						if ( args.hasOwnProperty( prop ) ) {
							self[ prop ] = args[ prop ];
						}
					}

					self.init = function() {
						gform.addFilter( 'gform_is_value_match', function( isMatch, formId, rule ) {

							if ( rule.operator !== 'does_not_contain' ) {
								return isMatch;
							}

							var fieldValue = '';
							var $field     = $( '#input_' + formId + '_' + rule.fieldId );
							var $inputs    = $field.find( 'input, select, textarea' );

							// This is a quick-and-dirty way to get the value of the field. We may need to revisit for
							// edge cases in the future.
							if ( $inputs.is(':checkbox') || $inputs.is(':radio') ) {
								fieldValue = $inputs.filter(':checked').map(function() {
									return this.value;
								}).get().join(',');
							} else if ( $inputs.is('select[multiple]') ) {
								fieldValue = $inputs.val() ? $inputs.val().join(',') : '';
							} else {
								fieldValue = $field.val() || '';
							}

							isMatch = typeof fieldValue === 'string' && fieldValue.indexOf( rule.value ) === -1;

							return isMatch;
						} );
					};

					self.init();

				}

			} )( jQuery );
		</script>
		<?php
	}

	public function add_init_script( $form ) {

		if ( ! $this->is_applicable_form( $form ) ) {
			return;
		}

		$script = 'new GWCLODoesNotContain();';
		$slug   = implode( '_', array( 'gwclo_does_not_contain', $form['id'] ) );

		GFFormDisplay::add_init_script( $form['id'], $slug, GFFormDisplay::ON_PAGE_RENDER, $script );
	}

	public function whitelist_operator( $is_valid, $operator ) {
		if ( $operator === 'does_not_contain' ) {
			$is_valid = true;
		}
		return $is_valid;
	}

	public function evaluate_operator( $is_match, $field_value, $target_value, $operation, $source_field, $rule ) {

		if ( $rule['operator'] !== 'does_not_contain' || rgar( $rule, 'gwclodncEvaluatingOperator' ) ) {
			return $is_match;
		}

		$rule['gwclodncEvaluatingOperator'] = true;

		// If the field contains the target value, it's not a match.
		$is_match = strpos( $field_value, $target_value ) === false;

		$rule['gwclodncEvaluatingOperator'] = false;

		return $is_match;
	}

	public function convert_conditional_logic_to_field_filters( $field_filters ) {

		foreach ( $field_filters as &$field_filter ) {
			if ( ! is_array( $field_filter ) ) {
				continue;
			}

			switch ( $field_filter['operator'] ) {
				case 'does_not_contain':
					$field_filter['operator'] = 'NOT LIKE';
					$field_filter['value']    = '%' . $field_filter['value'] . '%';
					break;
			}
		}

		return $field_filters;
	}

	public function is_applicable_form( $form ) {
		return GFFormDisplay::has_conditional_logic( $form );
	}
}

# Configuration

new GF_CLO_Does_Not_Contain();

Comments

  1. Peter Johnston
    Peter Johnston May 9, 2025 at 2:50 pm

    Great! Also helpful would be ≥, ≤, not >, not <. For instance, a conditional test for not > 0 would work for a 0 entry and a blank entry.

    Reply
    1. J Yeager
      J Yeager Staff May 9, 2025 at 7:22 pm

      Hey Peter,

      Thanks for the suggestion!

      For that specific example, if you are looking to check if the value of a Single Line Text field is 0 OR blank, you could currently accomplish this by setting up two separate conditions, and then checking if ANY of those conditions are true.

      Do you have any other specific examples in mind? We’d be happy to explore some of these further via support.

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