WooCommerce display a single product add to cart form with [add_to_cart_form]

shortcodes.php

/**
 * NB: updated version available here: https://github.com/helgatheviking/add-to-cart-form-shortcode
 */

/**
 * Add [add_to_cart_form] shortcode that display a single product add to cart form
 * Supports id and sku attributes [add_to_cart_form id=99] or [add_to_cart_form sku=123ABC]
 * Essentially a duplicate of the [product_page]
 * but replacing wc_get_template_part( 'content', 'single-product' ); with woocommerce_template_single_add_to_cart()
 *
 * @param array $atts Attributes.
 * @return string
 */
function kia_add_to_cart_form_shortcode( $atts ) {
		if ( empty( $atts ) ) {
			return '';
		}

		if ( ! isset( $atts['id'] ) && ! isset( $atts['sku'] ) ) {
			return '';
		}

		$args = array(
			'posts_per_page'      => 1,
			'post_type'           => 'product',
			'post_status'         => 'publish',
			'ignore_sticky_posts' => 1,
			'no_found_rows'       => 1,
		);

		if ( isset( $atts['sku'] ) ) {
			$args['meta_query'][] = array(
				'key'     => '_sku',
				'value'   => sanitize_text_field( $atts['sku'] ),
				'compare' => '=',
			);

			$args['post_type'] = array( 'product', 'product_variation' );
		}

		if ( isset( $atts['id'] ) ) {
			$args['p'] = absint( $atts['id'] );
		}

		$single_product = new WP_Query( $args );

		$preselected_id = '0';

		// Check if sku is a variation.
		if ( isset( $atts['sku'] ) && $single_product->have_posts() && 'product_variation' === $single_product->post->post_type ) {

			$variation = new WC_Product_Variation( $single_product->post->ID );
			$attributes = $variation->get_attributes();

			// Set preselected id to be used by JS to provide context.
			$preselected_id = $single_product->post->ID;

			// Get the parent product object.
			$args = array(
				'posts_per_page'      => 1,
				'post_type'           => 'product',
				'post_status'         => 'publish',
				'ignore_sticky_posts' => 1,
				'no_found_rows'       => 1,
				'p'                   => $single_product->post->post_parent,
			);

			$single_product = new WP_Query( $args );
		?>
			<script type="text/javascript">
				jQuery( document ).ready( function( $ ) {
					var $variations_form = $( '[data-product-page-preselected-id="<?php echo esc_attr( $preselected_id ); ?>"]' ).find( 'form.variations_form' );

					<?php foreach ( $attributes as $attr => $value ) { ?>
						$variations_form.find( 'select[name="<?php echo esc_attr( $attr ); ?>"]' ).val( '<?php echo esc_js( $value ); ?>' );
					<?php } ?>
				});
			</script>
		<?php
		}

		// For "is_single" to always make load comments_template() for reviews.
		$single_product->is_single = true;

		ob_start();

		global $wp_query;

		// Backup query object so following loops think this is a product page.
		$previous_wp_query = $wp_query;
		// @codingStandardsIgnoreStart
		$wp_query          = $single_product;
		// @codingStandardsIgnoreEnd

		wp_enqueue_script( 'wc-single-product' );

		while ( $single_product->have_posts() ) {
			$single_product->the_post()
			?>
			<div class="single-product" data-product-page-preselected-id="<?php echo esc_attr( $preselected_id ); ?>">
				<?php woocommerce_template_single_add_to_cart(); ?>
			</div>
			<?php
		}

		// Restore $previous_wp_query and reset post data.
		// @codingStandardsIgnoreStart
		$wp_query = $previous_wp_query;
		// @codingStandardsIgnoreEnd
		wp_reset_postdata();

		return '<div class="woocommerce">' . ob_get_clean() . '</div>';
}

add_shortcode( 'add_to_cart_form', 'kia_add_to_cart_form_shortcode' );

Hi Kathy,That would be brilliant! I don't really want to mess with the code, as I don't really know what I'm doing 🤷 🙃 Kind Regards Johanna Heath 

@jfheath I have added a parameter for that in the plugin. See version 3.0.2.

It would be used as [add_to_cart_form id="99" allow_form_action="true"]

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