RadAjaxPanel.ResponseScript.Add doesnt work

[Dan]

I am trying to show the radalert dialog box using the AjaxPanel.ResponseScript.add function.  Whats interesting is that it does work if I write static text in the radalert function, but I want the error message to display back to the user.

　
<VB.NET>
-------------------

 

 

Catch ex As Exception

 

 

 

    Me.RadAjaxPanel1.ResponseScripts.Add("radalert('" & ex.Message & "')")  '' < Doesn't work>

 

 

 

    Me.RadAjaxPanel1.ResponseScripts.Add("radalert('A error occurred. ')")  '' < Works >

 

 

 

End Try

 

I want the radalert to dynamically display the text of the error message  in the dialog box.  I dont want to have static text.  What am I doing wrong?

[Genti]

Hi Dan,

Did you include a RadWindowManager on the page?
The declarations should look like this:

<telerik:RadWindowManager ID="WindowManager1" runat="server"></telerik:RadWindowManager>

<telerik:RadAjaxPanel runat="server" ID="RadAjaxPanel1">
    <asp:Button Text="Get Response" ID="btn1" OnClick="btn1_Click" runat="server" />
</telerik:RadAjaxPanel>

And in the code-behind:

protected void btn1_Click(object sender, EventArgs e)
{
    string someValue="Something";
    RadAjaxPanel1.ResponseScripts.Add("radalert('" + someValue + "')");
}

Best wishes,
Genti
the Telerik team

[Dan]

Originally I had the the RadWindowManager below and outside the RadAjaxPanel.  I moved the RadWindowManager above (still outside) the panel, but still no radalert shows when trying to dynamically include text based on the exception.  Again, if I manully place text in the radalert (example: radalert('static text')), its appears.  So I wouldn't think it has to do with the placement of the RadWindowManager, although I did try your suggestion. 

[Genti]

Hello Dan,

The client error handling should be implemented through the scriptmanager instance.
In order to do so you have to make the following changes.

1) Define a AsyncPosbackError handler:

<telerik:RadScriptManager ID="RadScriptManager1" runat="server" OnAsyncPostBackError="ScriptManager1_AsyncPostBackError">

Code behind:

protected void ScriptManager1_AsyncPostBackError(object sender, AsyncPostBackErrorEventArgs e)
{
    RadScriptManager1.AsyncPostBackErrorMessage = e.Exception.Message;
}

2) Then in order to get the response from the ScriptManager on the client you can do the following(JavaScript):

Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);

        function EndRequestHandler(sender, args) {

            if (args.get_error() != undefined && args.get_error().httpStatusCode == '500') {
                var errorMessage = args.get_error().message
                args.set_errorHandled(true);
                radalert(errorMessage);
            }

        }

I am also attaching a simple project that illustrates this.


Best wishes,
Genti
the Telerik team

[Dan]

Solution.

You suggestions helped in finding the problem, but the basic problem was this:  The radalert text argument can not have a value with either character returns or line breaks in them.  Basically, what happen was, the exception.message value had a line break in the value.  This was apparent when, during troubleshooting, I used the msgbox in the code behind to display the error message (see attachment).  I created a sub routine to change the characters to thier equivalent ASC value.  When I did that, I saw 10 and 13 which are line feeds and character return codes.  The sub routine removes those codes, and when I used the returned value from my sub in the radalert function everything worked.

Public Function RemoveLineBreaks(ByVal text As String) As String

        Dim Length As Integer = Len(text)
        Dim i As Integer = 1
        Dim Asc As String
        Dim AscStringBuilder As New StringBuilder
        Dim AscString As String
        Dim AscArray() As String
        Dim TextBuilder As New StringBuilder


        'Convert to ASC String
        AscStringBuilder.Append("-")
        Do Until i > Length
            Asc = Strings.Asc(Strings.GetChar(text, i).ToString)
            AscStringBuilder.Append(Asc & "-")
            i = i + 1
        Loop

        'Replace LineBreak codes
        AscString = Replace(Replace(AscStringBuilder.ToString, "-10-", "-"), "-13-", "-")


        'Convert back to text
        AscArray = Split(AscString, "-")

        For Each AscNumber In AscArray
            If IsNumeric(AscNumber) Then
                TextBuilder.Append(Strings.Chr(AscNumber).ToString)
            End If
        Next


        Return TextBuilder.ToString()

    End Function


End Module