Shopify Collection Filter AJAX request URL.

filter.js

Shopify.queryParams = {};
if (location.search.length) {
  var params = location.search.substr(1).split("&");
  $.each(params, function (i, param) {
    var keyValue = param.split("=");
    if (keyValue.length) {
      Shopify.queryParams[decodeURIComponent(keyValue[0])] =
        decodeURIComponent(keyValue[1]);
    }
  });
}
Shopify.queryParams.sort_by = "best-selling"; // you can change it by dynamically

const view_all_URL = location.origin + location.pathname + "?" + $.param(Shopify.queryParams);