Modal form is working for 'create new category'

- Had to set form.helper.form_tag to False (so we could control form tags manually)
- Created a 'json' model view

InvenTree/part/templates/part/index.html

@@ -38,21 +38,42 @@
 {% block javascript %}
 
 <script type="text/javascript">
-$(function () {
+$(document).ready(function () {
+
     $(".js-create-cat").click(function () {
         $.ajax({
             url: '/part/category/new/',
             type: 'get',
-            //dataType: 'json',
+            dataType: 'json',
             beforeSend: function () {
                 $("#modal-cat").modal("show");
             },
             success: function (data) {
-                $("#modal-cat .modal-content").html(data);
-                //alert(data);
+                $("#modal-cat .modal-content").html(data.html_form);
             }
         });
     });
+
+    $("#modal-cat").on("submit", ".js-modal-form", function () {
+      var form = $(this);
+
+      $.ajax({
+          url: form.attr('action'),
+          data: form.serialize(),
+          type: form.attr('method'),
+          dataType: 'json',
+          success: function (data) {
+              if (data.form_valid) {
+                  alert("Success!");
+              }
+              else {
+                  $("#modal-cat .modal-content").html(data.html_form);
+              }
+          }
+      });
+
+      return false;
+    });
 });
 </script>