Modify variation drop-downs to radio buttons

Changes variation drop-down form fields to radio button fields.

If you need a more advanced version of this functionality, check out the official extension WooCommerce Variation Swatches and Photos.

add_action( 'woocommerce_variable_add_to_cart', function() {

	add_action( 'wp_print_footer_scripts', function() {

		?>
		<script type="text/javascript">

		// DOM Loaded
		document.addEventListener( 'DOMContentLoaded', function() {
 
			// Get Variation Pricing Data
			var variations_form = document.querySelector( 'form.variations_form' );
			var data = variations_form.getAttribute( 'data-product_variations' );
			data = JSON.parse( data );

			// Loop Drop Downs
			document.querySelectorAll( 'table.variations select' )
				.forEach( function( select ) {

				// Loop Drop Down Options
				select.querySelectorAll( 'option' )
					.forEach( function( option ) {

					// Skip Empty
					if( ! option.value ) {
						return;
					}

					// Get Pricing For This Option
					var pricing = '';
					data.forEach( function( row ) {
						if( row.attributes[select.name] == option.value ) {
							pricing = row.price_html;
						}
					} );

					// Create Radio
					var radio = document.createElement( 'input' );
						radio.type = 'radio';
						radio.name = select.name;
						radio.value = option.value;
						radio.checked = option.selected;
					var label = document.createElement( 'label' );
						label.appendChild( radio );
						label.appendChild( document.createTextNode( ' ' + option.text + ' ' ) );
					var span = document.createElement( 'span' );
						span.innerHTML = pricing;
						label.appendChild( span );
					var div = document.createElement( 'div' );
						div.appendChild( label );

					// Insert Radio
					select.closest( 'td' ).appendChild( div );

					// Handle Clicking
					radio.addEventListener( 'click', function( event ) {
						select.value = radio.value;
						jQuery( select ).trigger( 'change' );
					} );

				} ); // End Drop Down Options Loop

				// Hide Drop Down
				select.style.display = 'none';

			} ); // End Drop Downs Loop
 
		} ); // End Document Loaded

		</script>
		<?php

	} );

} );
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