update,

it114105/itp4513/Assignment/19-20/static/js/cart.js

@@ -0,0 +1,28 @@
+var storeId = document.getElementById("storeId").value;
+var xhr = new XMLHttpRequest();
+var url = "viewCart";
+var json;
+xhr.open("GET", url);
+xhr.send();
+xhr.onreadystatechange = function () {
+    if (xhr.readyState === 4 && xhr.status === 200) {
+        json = JSON.parse(xhr.responseText);
+        console.log(json);
+        if(json.statue && json.storeId != null && json.storeId != storeId){
+          var size = window.location.href.search("#");
+          location.replace("store?id=" + storeId + "#wraning-modal");
+        }else if (json.statue && json.storeId == storeId) {
+          let index = 0;
+          var elemt = document.getElementsByTagName("ol")[0];
+          for(var i = 0; i < elemt.childElementCount; i++){
+              if(i == index && json.itemCount > 0){
+                elemt.children[i].innerHTML += '<li id="cart"><a href="cart" class="selected"><span><div class="item-count">' + json.itemCount +'</div> Cart</span></a></li>';
+              }
+          }
+        }
+    }
+};
+
+function closeModal(){
+  location.replace("home#");
+}