ModalPopupExtender displays during PageLoad
February 4th, 2010
I’ve noticed that in some of my developments using Ajax.Net the ModalPopupExtender flashes up breifly while some of the elements within the page finish loading. I have noticed this for browsers IE and Firefox, but not Chrome.
There is a very simple solution, you just have to remember to do it everytime you want to use a ModalPopup. Add the style=”display:none;” attribute to the asp:panel you are using as the extender, and this will ensure the ModalPopup remains invisible while the page loads.
