I recently tried following a tutorial on using ASP.NET Ajax Popup Control to display GridView row details. However, I encountered a runtime error when attempting to perform a mouseover action. The error message reads:
Sys.ArgumentUndefinedException: Value cannot be undefined. Parameter name: type
Upon investigation, I found that the issue lies within the following lines of code:
string OnMouseOverScript = string.Format("$find('{0}').showPopup();", behaviorID);
string OnMouseOutScript = string.Format("$find('{0}').hidePopup();", behaviorID);
img.Attributes.Add("onmouseover", OnMouseOverScript);
img.Attributes.Add("onmouseout", OnMouseOutScript);
Are there any suggestions on how to resolve this error? My objective is to display details of a gridview row when hovering over a specific column, similar to the demo provided in the tutorial I referenced.