title: Why does my jsGrid refuse to update an edited row?
body: <p>I know there are alternatives, but I really want to use jsGrid in my project. I am using the 1.5.2 version as indicated on their website, and pulling it from CDN. All I want is for the update to be called as described, so that I can do a <code>$.ajax</code>, but it seems like that callback doesn't do anything. Here is my implementation:</p>
  
  <pre><code>$(function() {
          $("#jsGrid").jsGrid({
              width: "100%",
              height: "600px",
  
              inserting: false,
              editing: true,
              sorting: true,
              paging: false,
              autoload: true,
  
              controller: {
                  loadData: function(filter) {
                      return $.ajax({
                          type: "GET",
                          url: "@Url.Action("getOptions", New With {.communityID = 1})",
                          data: filter
                      });
                  },
  
                  updateItem: function (item) {
                      console.log('hello??');
                      return $.ajax({
                           type: "PUT",
                           url: "/items",
                           data: item
                      });
                  }
              },
  
              ...
          });
      })
  </code></pre>
  
  <ul>
  <li><p>It says in the documentation that the controller methods are expected
  to return Promises. That's alright, as I'm using jQuery 3.0, and
  <code>$.ajax</code> returns a now-standardized Javascript Promise/A (which is
  what jsGrid expects). </p></li>
  <li><p>I know the controller object is being properly understood because it
  calls <code>loadData()</code>, and populates with beautiful rows from my REST
  service.</p></li>
  <li><p>After looking at many other examples, it seems like everyone gets it to work with the very simple code provided in the documentation. My <code>console.log</code> never gets hit on a breakpoint, and the AJAX call never happens in the network tab.</p></li>
  <li><p>I switched to the non-minified version of jsgrid.js, and I never get any console errors.</p></li>
  <li><p>When I blur a row (move away from a row I am editing) the value goes back to what it initially was.</p></li>
  </ul>
  
  <p>Maybe I just don't understand how it works? To persist edits to my DB, should I be looking for a different event? Any help would be very much appreciated!</p>