Add/remove query parameters to the URL bar

update-url.js

		updateParams : function() {
			$('.class').on('change', function(e) {
				e.preventDefault();
				let url = window.location.pathname;
				if ( $(this).prop('checked') ) {
					let query_string = this.buildParamStr('param-name', 'param-value', true);
					window.history.pushState('old-ai-state', '', url + query_string);
				} else {
					let query_string = this.buildParamStr('ai_fwp_filter', null, false);
					window.history.pushState('old-ai-state', '', url + query_string);
				}
			});
		},
		buildParamStr : function (key, value, append) {
			let param_hash = [];
			let hash_str = '';
			let param_str = window.location.search.replace('?', '').split('&');

			$.each(param_str, function(idx, val) {
				let param_name = val.split('=')[0];
				if ( key !== param_name) {
					param_hash.push(val);
				}
			});
			if ( append ) {
				param_hash.push(key + '=' + value)
			}

			hash_str = param_hash.join('&');
			if ( '' !== hash_str ) {
				hash_str =  '?' + hash_str;
			}
			return hash_str;
		}