Ajax Help

[binilprasad]

I am using asp.net 2003 and am using ajax in my application.currently
what am doing is that in my project i have another aspx page named ajaxEngine where all the server processes are done.After that i call a response.write() to send the xml file to my client side aspx page.

My doubt is that can't i use the code behind page of the same client side aspx page instead of another page like ajaxEngine

[mcmcom]

My doubt is that can't i use the code behind page of the same client side aspx page instead of another page like ajaxEngine

i dont understand your question. can you re-phrase it. do you mean you want your aspx pages to inherit the classes from the ajaxEngine.cs file? or do you want the ajaxEngine.aspx file to inherit from another page?

mcm

[aje33]

See this http://www.codestreet.com/

[binilprasad]

Thanks for giving attention.
What i meant is that instead of using another aspx page for processing the client requests can i use the code behind (.aspx.cs) page of the client.

Now am using another page named ajaxEngine.aspx to process requests from my client.aspx page.from the ajaxEngine page am sending response in xml form to client page.

[Ranthalion]

Binil,

I just worked on something like this, too. I have .aspx pages and .aspx.vb code behinds. I am sending all my ajax requests via POST to AjaxHandler.vb. Our methods sound very similar.

First, I had to change all the urls that I send the request to. Instead of sending to myPage.aspx, I am sending to AjaxHandler.ashx. The request is forwarded to the AjaxHandler class by a modification in the web.config. Then, AjaxHandler does its work and sends back some xml to the client.

This is how I open the request in javascript:
this._xmlhttp.open('post', url, true);

And I send my xml document like this ( strUrl = AjaxHandler.ashx ):
a.call(strUrl, xmlDoc);

This is what I had to put into web.config (It goes in <system.web>):

<httpHandlers>
  <!-- Simple Handler -->
  <add verb="*" path="Ajax.ashx" type="GLRecon.Ajax, GLRecon" />
</httpHandlers>

Then, the AjaxHandler class looks a lot like this. It has to implement IHttpHandler...

Imports System.Web
Imports System.Xml

Public Class Ajax
    Implements IHttpHandler

    Public ReadOnly Property IsReusable() As Boolean Implements System.Web.IHttpHandler.IsReusable
        Get
            Return True
        End Get
    End Property

    Public Sub ProcessRequest(ByVal context As System.Web.HttpContext) Implements System.Web.IHttpHandler.ProcessRequest
        Dim xmlDoc As XmlDocument

        'If the XML document was submitted via post method, then load it in the DOM document
        If (context.Request.InputStream.Length > 0 And context.Request.ContentType.ToString().IndexOf("/xml") > 0) Then
            xmlDoc = New XmlDocument
            xmlDoc.Load(context.Request.InputStream)

            Select Case xmlDoc.GetElementsByTagName("Command").Item(0).InnerText
                Case "Bar"
                    Call Bar()
                Case "Func2"
                    Call Func2()
                Case "HelloWorld"
                    Call HelloWorld()
                    ...etc...
            End Select

        End If
    End Sub

    Public Sub Bar()
        'Get params, do some work, and return something in the Response...
    End Sub
End Class

Public Sub ReturnXML(ByVal context As HttpContext, ByVal rawXml As String)
    If (rawXml = "") Then
        Throw New ApplicationException("The value of rawXml was not defined.")
    End If

    context.Response.ContentType = "application/xml"
    Dim xw As New XmlTextWriter(context.Response.OutputStream, New System.Text.UTF8Encoding)
    xw.WriteRaw(rawXml)
    xw.Close()
End Sub

End Class

Hope this helps you, my code is not fully functional as I could not post that to the forum, but this is pretty close, and should give you a good starting point, even though it's vb.net instead of c#.

-Ranthalion