MarketPress Feature : Find product by Tag

JS Changes.js

// Modify two functions in your ajax-cart.js file. 
// It can be found in the marketpress-includes/js folder. 
// Simply copy/paste and //replace the 2 functions there with the code from here
// `mp_store_listeners` and `get_and_insert_products`

//general store listeners (e.g. pagination, etc)
	function mp_store_listeners(){
		// on next/prev link click, get page number and update products
		$(document).on('click', '#mp_product_nav a', function(e){
			e.preventDefault();

			var hrefParts = $(this).attr('href').split('#'),
					qs = parse_query(hrefParts[1]);
			var url = $(location).attr('href');
					if (url.indexOf("tag") > -1) {
							var myregex = /tag(?=[/])(.*)(?=[/])/g;
							var myArray = myregex.exec(url);
							var tag = myArray[1].replace("/","");
						}

			if (typeof tag !== 'undefined')
				 {
				 	get_and_insert_products($('.mp_product_list_refine').serialize() +'&tag=' + tag + '&page=' + qs['page']);
				 }
			else {
 					get_and_insert_products($('.mp_product_list_refine').serialize() + '&page=' + qs['page']);
				 }
		});
	}

	// get products via ajax, insert into DOM with new pagination links
	function get_and_insert_products(query_string){
		ajax_loading(true);
		$.post(MP_Ajax.ajaxUrl, 'action=get_products_list&' + query_string, function(data) {
			var qs = parse_query(query_string);

			if('tag' in qs) {
				hash = 'product_category=' + qs['product_category']
				     + '&order=' + $('select[name="order"]').val()
				     + '&tag=' + qs['tag']
				     + '&page=' + qs['page'];
			}
			else{
				hash = 'product_category='
				+ qs['product_category']
				+ '&order=' + $('select[name="order"]').val()
				+ '&page=' + qs['page'];
			}
			ajax_loading(false);
			$('#mp_product_nav').remove();
			$('#mp_product_list').first().replaceWith(data.products);
			location.hash = hash;

			// scroll to top of list
			var pos = $('a[name="mp-product-list-top"]').offset();
			$('body,html').animate({ scrollTop: pos.top - 20 });
	  });
	}

PHP Changes.php

// Add this snippet in your marketpress.php file in the get_products_list function

    if ( isset($_POST['tag'])) {
	$args['tag'] = $_POST['tag'];
    }

// Add it just above these lines.
    $ret['products'] = mp_list_products($args);
    wp_send_json($ret);