问题
I have a dundas chart with ajax zooming and scrolling enable. It works fine in a webform page. But once I put in a user control and called it from another page I get this error -
the target 'ctl00$ContentPlaceHolder1$uc2$chartVisits' for the callback could not be found or did not implement ICallbackEventHandler.
-when I try to use the zoom and scroll functionality.
What can I do to resolve this problem. Thank You.
回答1:
I've seen this error when dynamically adding controls that use AJAX. Make sure you're adding any controls in the OnInit method, or during the Page_Init event. That has solved this problem for me in the past.
来源：https://stackoverflow.com/questions/3956327/dundas-chart-in-user-control