Fix required form radio/checkbox fields

.dev/config/webpack.config.js

@@ -19,6 +19,7 @@ module.exports = {
 
 		'js/coblocks-accordion-polyfill': path.resolve( process.cwd(), 'src/js/coblocks-accordion-polyfill.js' ),
 		'js/coblocks-accordion-carousel': path.resolve( process.cwd(), 'src/js/coblocks-accordion-carousel.js' ),
+		'js/coblocks-checkbox-required': path.resolve( process.cwd(), 'src/js/coblocks-checkbox-required.js' ),
 		'js/coblocks-datepicker': path.resolve( process.cwd(), 'src/js/coblocks-datepicker.js' ),
 		'js/coblocks-events': path.resolve( process.cwd(), 'src/js/coblocks-events.js' ),
 		'js/coblocks-fromEntries': path.resolve( process.cwd(), 'src/js/coblocks-fromEntries.js' ),

.dev/tests/phpunit/includes/test-coblocks-form.php

@@ -382,7 +382,7 @@ public function test_render_field_radio_empty_options() {
 	 */
 	public function test_render_field_radio() {
 
-		$this->expectOutputRegex( '/<label class="coblocks-radio-label" for="radio-option-1">Option 1<\/label><input id="radio-option-2" type="radio" name="field-radio\[value\]" value="Option 2" class="radio">/' );
+		$this->expectOutputRegex( '/<label class="coblocks-radio-label" for="choose-one-option-1">Option 1<\/label><input id="choose-one-option-2" type="radio" name="field-choose-one\[value\]" value="Option 2" class="radio">/' );
 
 		echo $this->coblocks_form->render_field_radio(
 			[
@@ -508,6 +508,49 @@ public function test_render_field_checkbox_inline() {
 
 	}
 
+	/**
+	 * Test the checkbox required class is added to the markup as expected
+	 */
+	public function test_render_field_checkbox_required_class() {
+
+		$this->expectOutputRegex( '/<div class="coblocks-field checkbox required">/' );
+
+		echo $this->coblocks_form->render_field_checkbox(
+			[
+				'options' => [
+					'option-1' => 'Option 1',
+					'option-2' => 'Option 2',
+				],
+				'required' => true,
+			],
+			''
+		);
+
+	}
+
+	/**
+	 * Test that the required checkbox field script is loaded when checkboxes
+	 * are set to required
+	 */
+	public function test_required_checkbox_script() {
+
+		$this->coblocks_form->render_field_checkbox(
+			[
+				'options' => [
+					'option-1' => 'Option 1',
+					'option-2' => 'Option 2',
+				],
+				'required' => true
+			],
+			''
+		);
+
+		global $wp_scripts;
+
+		$this->assertArrayHasKey( 'coblocks-checkbox-required', $wp_scripts->registered );
+
+	}
+
 	/**
 	 * Test the website field markup is as expected
 	 */

.dev/tests/phpunit/test-class-coblocks.php

@@ -184,6 +184,7 @@ public function test_final_build_assets_exist() {
 			'js'  => [
 				'dist/coblocks.js',
 				'dist/js/coblocks-accordion-polyfill.js',
+				'dist/js/coblocks-checkbox-required.js',
 				'dist/js/coblocks-datepicker.js',
 				'dist/js/coblocks-fromEntries.js',
 				'dist/js/coblocks-google-maps.js',
@@ -195,6 +196,7 @@ public function test_final_build_assets_exist() {
 				'dist/js/vendors/flickity.js',
 				'dist/js/vendors/slick.js',
 				'src/js/coblocks-accordion-polyfill.js',
+				'src/js/coblocks-checkbox-required.js',
 				'src/js/coblocks-datepicker.js',
 				'src/js/coblocks-fromEntries.js',
 				'src/js/coblocks-google-maps.js',

docs/hooks/forms-block.md

@@ -30,3 +30,22 @@ function coblocks_form_sent_message() {
 }
 add_filter( 'coblocks_form_sent_notice', 'coblocks_form_sent_message' );
 ```
+
+## Customize the Checkbox Required Text
+
+The following `PHP` filter can be used to set a custom response when a required checkbox group has no options set before submitting the form.
+
+```php
+/**
+ * Set a custom error message to display when a required checkbox 
+ * group has no options set before submitting the form.
+ *
+ * @return string Form submission success message
+ */
+function coblocks_checkbox_required_text() {
+
+	return __( 'Please check at least one checkbox.', 'textdomain' );
+
+}
+add_filter( 'coblocks_form_checkbox_required_text', 'coblocks_checkbox_required_text' );
+```

includes/class-coblocks-form.php

@@ -487,9 +487,10 @@ public function render_field_radio( $atts ) {
 
 		$the_options = array_filter( $atts['options'] );
 
-		$label      = isset( $atts['label'] ) ? $atts['label'] : __( 'Choose one', 'coblocks' );
-		$label_desc = sanitize_title( $label ) !== 'choose-one' ? sanitize_title( $label ) : 'radio';
-		$label_slug = $radio_count > 1 ? sanitize_title( $label_desc . '-' . $radio_count ) : sanitize_title( $label_desc );
+		$label         = isset( $atts['label'] ) ? $atts['label'] : __( 'Choose one', 'coblocks' );
+		$label_desc    = sanitize_title( $label ) !== 'choose-one' ? sanitize_title( $label ) : 'choose-one';
+		$label_slug    = $radio_count > 1 ? sanitize_title( $label_desc . '-' . $radio_count ) : sanitize_title( $label_desc );
+		$required_attr = ( isset( $atts['required'] ) && $atts['required'] ) ? ' required' : '';
 
 		ob_start();
 
@@ -503,14 +504,15 @@ public function render_field_radio( $atts ) {
 
 		}
 
-		foreach ( $the_options as $value ) {
+		foreach ( $the_options as $key => $value ) {
 
 			printf(
-				'<input id="%1$s" type="radio" name="field-%2$s[value]" value="%3$s" class="radio">
-				<label class="coblocks-radio-label" for="%1$s">%4$s</label>',
+				'<input id="%1$s" type="radio" name="field-%2$s[value]" value="%3$s" class="radio"%4$s>
+				<label class="coblocks-radio-label" for="%1$s">%5$s</label>',
 				esc_attr( $label_slug . '-' . sanitize_title( $value ) ),
 				esc_attr( $label_slug ),
 				esc_attr( $value ),
+				$key === 0 ? esc_attr( $required_attr ) : '',
 				esc_html( $value )
 			);
 
@@ -600,10 +602,37 @@ public function render_field_checkbox( $atts ) {
 
 		$label      = isset( $atts['label'] ) ? $atts['label'] : __( 'Select', 'coblocks' );
 		$label_slug = $checkbox_count > 1 ? sanitize_title( $label . '-' . $checkbox_count ) : sanitize_title( $label );
+		$required   = ( isset( $atts['required'] ) && $atts['required'] );
+
+		if ( $required ) {
+
+			wp_enqueue_script(
+				'coblocks-checkbox-required',
+				CoBlocks()->asset_source( 'js' ) . 'coblocks-checkbox-required.js',
+				array(),
+				COBLOCKS_VERSION,
+				true
+			);
+
+		}
 
 		ob_start();
 
-		print( '<div class="coblocks-field">' );
+		printf(
+			'<div class="coblocks-field checkbox%1$s">
+				%2$s',
+			$required ? esc_attr( ' required' ) : '',
+			$required ? sprintf(
+				'<div class="required-error hidden">%s</div>',
+				/**
+				 * Filter the checkbox required text that displays when no checkbox is
+				 * selected when the form is submitted.
+				 *
+				 * @param string $error_text Error text displayed to the user.
+				 */
+				(string) apply_filters( 'coblocks_form_checkbox_required_text', esc_html__( 'Please select at least one checkbox.', 'coblocks' ) )
+			) : ''
+		);
 
 		$this->render_field_label( $atts, $label, $checkbox_count );
 

src/blocks/form/styles/style.scss

@@ -10,6 +10,10 @@
 		margin: 1.25rem 0 3px 0;
 	}
 
+	.required-error.hidden {
+		display: none;
+	}
+
 	.coblocks-field,
 	select {
 		margin: 0 0 1.25rem 0;

src/js/coblocks-checkbox-required.js

@@ -0,0 +1,30 @@
+document.addEventListener( 'DOMContentLoaded', function() {
+	document.querySelectorAll( '.coblocks-form form' ).forEach( form => {
+
+		let requiredErrorDiv = form.getElementsByClassName( 'required-error' )[0];
+
+		// No required checkboxes
+		if ( ! form.querySelectorAll( '.coblocks-field.checkbox.required' ).length ) {
+			return;
+		}
+
+		// Form Submit Event Listener
+		form.addEventListener( 'submit', event => {
+			let selectedCheckboxes = form.querySelectorAll( '.coblocks-field.checkbox.required input[type="checkbox"]:checked' ).length;
+			if ( selectedCheckboxes === 0 ) {
+				requiredErrorDiv.style.display = 'block';
+				event.preventDefault();
+				return;
+			}
+			requiredErrorDiv.style.display = 'none';
+		} );
+
+		// Required Checkbox Event Listener
+		form.querySelectorAll( '.coblocks-field.checkbox.required input[type="checkbox"]' ).forEach( requiredCheckbox => {
+			requiredCheckbox.addEventListener( 'change', () => {
+				requiredErrorDiv.style.display = 'none';
+			} );
+		} );
+
+	} );
+} );