1. There is no this.GetCallbackEventReference()
2. RaiseCallbackEvent() does not return string data type, from ICallbackEventHandler
3. Missing of GetCallbackResult(), that defined in ICallbackEventHandler
Finally I get it done by making some corrections:
1. Use this.ClientScript.GetCallbackEventReference()
2. Define the RaiseCallbackEvent() that returns no data type
3. Define GetCallbackResult() to return the result to the client-side
Corrected code:
protected void Page_Load(object sender, EventArgs e)
{
sCallBackInvocation = this.ClientScript.GetCallbackEventReference(this, "message", "ShowServerTime", "context", "OnError",true);
}
public void RaiseCallbackEvent(string eventArgument)
{
sCallBackInvocation = DateTime.Now.ToString();
}
public string GetCallbackResult()
{
return sCallBackInvocation;
}
Recommendation
1. Check whether the browser does support callback feature in Page_Load() event
if (!Request.Browser.SupportsCallback)
// error message
No comments:
Post a Comment