How would I add a javascript MessageBox in ASP.NET in the code behind pages using C#.
I have something like this in mind although I still cant get it quite right.
if (success == false)
{
HttpContext.Current.Response.Write("<SCRIPT LANGUAGE=""JavaScript"">alert('User name already exists')</SCRIPT>");
}
Kind regards
Check this out:
http://msdn.microsoft.com/en-us/library/aa478975.aspx
Add a HiddenField to your ASPX
<asp:HiddenField runat="server" ID="errorHf" />
Add the following JS code to your ASPX page
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function() {
var sErrorData = $('#errorHf').val();
if (sErrorData != "") {
alert(sErrorData);
$('#errorHf').val("");
}
});
</script>
Once you get an error, just set errorHf.Value
if (!success)
errorHf.Value = "Something went wrong!";
Don't forget to reset the error message on each Page_Load, so add
errorHf.Value = String.Empty;
So the message won't persist with each Postback.
Try this:
<script type="text/JavaScript">
alert('hello world');
</script>
You can use the ASP.NET codebehind to write it to the page
ClientScript.RegisterStartupScript(this.GetType(), "myalert", "alert('" + myStringVariable + "');", true);
This works for me:
Dim script As String =
"<script language='javascript'>" &
"alert('my message');" &
"</script>"
Dim cs As ClientScriptManager = Me.Page.ClientScript
cs.RegisterStartupScript(GetType(String), "myAlertID", script)
