Using radconfirm() CallBackFunction to perform a postback
Environment
Product | Telerik WebForms ToolBar for ASP.NET AJAX |
Description
Unlike the standard confim()
, radconfirm()
cannot block the execution of the thread (this is something that cannot be done with Javascript) and a CallBackFunction is needed.
The sample code snippet demonstrates a real-life scenario where when clicking one of the Toolbar's buttons we want to ask a confirmation from the user before performing the postback. RadWindowManager and RadToolbar are wrapped in RadAjaxPanel to avoid full page's postback.
Solution
The implementation of such scenario is relatively simple - when the user clicks on the button, we need to make a check what button is clicked and if it is the one which requires confirmation - cancel the postback and call radconfirm()
.
Once the user confirms the postback, in the radconfirm's CallBackFunction we will use __doPostBack()
to send the information on the server:
<%= RadToolbar1.ClientID %>.attachEvent("OnClientClick", "Toolbar_ClientClick");
function Toolbar_ClientClick(sender, e) {
if (sender.CommandName == "Delete") {
radconfirm("Delete?", CallBackFn);
return false;
}
else {
return true;
}
}
function CallBackFn(arg) {
if (arg) {
__doPostBack("<%= RadToolbar1.UniqueID %>", "onclick#Delete");
}
}
In the __doPostBack()
we are provide the following arguments:
- The UniqueID of the RadToolbar - this will allow us to reference the toolbar even if a MasterPage is used
- The RadToolBar command that we want to be executed.
And in the codebehind:
protected void RadToolbar1_OnClick(object sender, Telerik.WebControls.RadToolbarClickEventArgs e)
{
Message.Text = "You clicked " + e.Button.CommandName + " " + DateTime.Now.ToString("hh:mm:ss");
}
DOWNLOAD the sample project: toolbar-using-radconfirm-callbackfunction-to-perform-a-postback.zip