 <p>JayData does <strong>NOT</strong> track complex types (like arrays or custom type objects) inner values.. It just tracks the reference to the value.</p> <p>In case you want to force the update in this case, you have to make a "deep copy" or encapsulate you current object into another one for the reference to change. For example using jQuery:</p> <pre><code>entity.field = jQuery.extend({}, field); </code></pre> <p>Nothing really changes for your object values, but it gets encapsulated in jQuery's object and the reference has changed, so JayData thinks it's value has changed and sends the updated values to the server.</p> <p>It is a workaround, but as my friend said: "Do you really care about how much <strong><em>clients'</em></strong> CPU you use?" :)</p>