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    <p>There is something missing in your examples which is how EH_SortableRecieve is called. But based on what you say it should be used as I'm thinking it is used something like this:</p> <pre><code>htmlelement.onmouseup = shippingObject.EH_SortableRecieve; </code></pre> <p>In which case you should be aware of Javascript's binding of <code>this</code> in methods. Specifacally, in event handlers <code>this</code> is bound to the <code>window</code> object instead of the object the method belongs to. This is a general feature of javascript: methods can be re-bound at runtime. In other words, objects can steal other object's methods. For example, I can have my object <code>slebetmans_object</code> steal your method and re-bind its <code>this</code> with the following:</p> <pre><code>shippingObject.EH_SortableRecieve.apply(slebetmans_object,parameters); </code></pre> <p>There are several strategies to get around this. You can use a closure to capture your object:</p> <pre><code>htmlelement.onmouseup = function(){ shippingObject.EH_SortableRecieve() }; </code></pre> <p>You can use a closure in the object's constructor to capture the correct reference to your object:</p> <pre><code>function ShippingUI () { var self = this; // since self is resolved at the time the object is created // it always reference to the "correct" object this.EH_SortableRecieve = function(event, ui) { self.UpdateItemQTYs('ABCD',123); } } </code></pre> <p>There are probably other ways to do this but these are the two most common that I personally use.</p>
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    1. COSince @Nick is using jQuery, he really should be doing his event binding that way, and not with the deprecated "onfoo" attributes.
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    2. COExcellent, thank you! I placed all of my methods inside the constructor, and stopped using prototype to add them. Then I could "save" 'this' to a variable so it was always available and correct. "self" was highlighted in my editor as a keyword, so I used "TrueThis" instead. Thanks again!
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    3. CO@Pointy I've updated the original question to include the event binding function. I'm using JQuery UI's ".sortable()" method.
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