AJAX :: Expando Attributes Going Missing?
May 22, 2010
I have a Javascript function which handles the onChange event of a dropdown list. Each item in the dropdown has some additional attributes added in the Page_Load event. When the user selects an item from the dropdown, the onChange function is executed as expected. The attribute values are picked up and processing works as expected. The dropdown sits on a modal popup.
Looking in the debugger, I can see that my additional attributes sit in an Expando collection within the SelectedItem object that has been passed into the function. If I click Cancel, the modal popup closes. If I then open it again and select a different item from the dropdown, the function again executes as expected and the Expando collection is there with all my attributes in it. So far, so good.
However, if I Update rather than Cancel, the form posts back. If I then open the modal popup again and select a value from the dropdown, the function executes as expected. However, all of my attributes have a null value.Doing a bit of digging, I can see in the debugger that the Expando collection is no longer there. However, if I look at the source code (current version in developer tools), I can see that the attributes are definitely present on the Options within the Select (dropdown).So, it seems that the attributes are there, but Javascript can't "see them".
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