Hiding a Popup Panel with JavaScript
Had a instance where I needed to close the Popup Control with JavaScript
1: <ajax:PopupControlExtender ID="pceShowPanel" runat="server"
2: TargetControlID="showPanel"
3: PopupControlID="popupPanel"
4: BehaviorID="popupBehavior"
5: />
So with that on your page just hide it with hidePopup().
1: function Hide(){
2: $find('popupBehavior').hidePopup()
3: }
Of course you can show the popup as well with the showPopup() method. The real trick here is the $find shortcut method. The FindComponent method does just that and get's the component in this case the PopupExtender and allows you to call the methods associated with that control.