The simple_condition Helper

Introduction

When using the Settings API there may be times when you need a field type which allows the user to define a simple conditional logic rule, that’s where the simple_condition() function helps.

Include the custom setting

Because there isn’t an actual simple_condition field type you would need to create your own Custom Field Type. In this example our custom field type will be named custom_logic_type, it is defined in the settings fields array like so:

array(
	'label' => esc_html__( 'Simple condition', 'simpleaddon' ),
	'type'  => 'custom_logic_type',
	'name'  => 'custom_logic',
),

Define custom_logic_type field markup

Now the setting has been included we need to define the markup for the custom_logic_type field type so it can be displayed on the settings page.

Because we don’t want the simple condition settings to be used all the time we will add a checkbox which can be used to enable/disable them. An onlclick event will be added to the checkbox to show/hide the div containing the simple condition settings.

public function settings_custom_logic_type( $field, $echo = true ) {

	// Get the setting name.
	$name = $field['name'];

	// Define the properties for the checkbox to be used to enable/disable access to the simple condition settings.
	$checkbox_field = array(
		'name'    => $name,
		'type'    => 'checkbox',
		'choices' => array(
			array(
				'label' => esc_html__( 'Enabled', 'simpleaddon' ),
				'name'  => $name . '_enabled',
			),
		),
		'onclick' => "if(this.checked){jQuery('#{$name}_condition_container').show();} else{jQuery('#{$name}_condition_container').hide();}",
	);

	// Determine if the checkbox is checked, if not the simple condition settings should be hidden.
	$is_enabled      = $this->get_setting( $name . '_enabled' ) == '1';
	$container_style = ! $is_enabled ? "style='display:none;'" : '';

	// Put together the field markup.
	$str = sprintf( "%s<div id='%s_condition_container' %s>%s</div>",
		$this->settings_checkbox( $checkbox_field, false ),
		$name,
		$container_style,
		$this->simple_condition( $name )
	);

	echo $str;
}

Populate the fields drop down

We need to define which fields are to be available for selection in the simple condition settings fields drop down.

public function get_conditional_logic_fields() {
	$form   = $this->get_current_form();
	$fields = array();
	foreach ( $form['fields'] as $field ) {
		if ( $field->is_conditional_logic_supported() ) {
			$inputs = $field->get_entry_inputs();

			if ( $inputs ) {
				$choices = array();

				foreach ( $inputs as $input ) {
					if ( rgar( $input, 'isHidden' ) ) {
						continue;
					}
					$choices[] = array(
						'value' => $input['id'],
						'label' => GFCommon::get_label( $field, $input['id'], true )
					);
				}

				if ( ! empty( $choices ) ) {
					$fields[] = array( 'choices' => $choices, 'label' => GFCommon::get_label( $field ) );
				}

			} else {
				$fields[] = array( 'value' => $field->id, 'label' => GFCommon::get_label( $field ) );
			}

		}
	}

	return $fields;
}

Evaluate the rules

To evaluate the rules the user configured for the custom_logic setting we will need to create a custom helper function. In this example the setting is being used on a form settings page so we need to retrieve them from the form settings. If the settings are being used on a feed settings page you would need to retrieve them from the $feed[‘meta’].

public function is_custom_logic_met( $form, $entry ) {
	$settings = $this->get_form_settings( $form );

	$name       = 'custom_logic';
	$is_enabled = rgar( $settings, $name . '_enabled' );

	if ( ! $is_enabled ) {
		// The setting is not enabled so we handle it as if the rules are met.

		return true;
	}

	// Build the logic array to be used by Gravity Forms when evaluating the rules.
	$logic = array(
		'logicType' => 'all',
		'rules'     => array(
			array(
				'fieldId'  => rgar( $settings, $name . '_field_id' ),
				'operator' => rgar( $settings, $name . '_operator' ),
				'value'    => rgar( $settings, $name . '_value' ),
			),
		)
	);

	return GFCommon::evaluate_conditional_logic( $logic, $form, $entry );
}

This helper can then be used wherever you need to evaluate the rules, in the sample add-on available on GitHub the helper is used to determine if a custom action should be performed at the end of the form submission process.

public function after_submission( $entry, $form ) {

	// Evaluate the rules configured for the custom_logic setting.
	$result = $this->is_custom_logic_met( $form, $entry );

	if ( $result ) {
		// Do something awesome because the rules were met.
	}
}