Error: The AjaxMethod "Class" is not defined

I have an older asp.net project that utilizes Ajax.AjaxMethod() to invoke server-side code from Javascript. It used to function properly, but now it has suddenly ceased to work.

Here is the C# code behind:

public partial class Signup : System.Web.UI.Page{
    protected void Page_Load(object sender, EventArgs e){
        Ajax.Utility.RegisterTypeForAjax(typeof(Signup));
    }

    [Ajax.AjaxMethod()]
    public DataTable fillStateDdl(int countryid)
    {
      objState = new MyClass.State();
      DataTable dtState = new DataTable();
      objState.CountryId = Convert.ToInt32(countryid);
      dtState = objState.GetStateCountry().Tables[0];
      return dtState;
    }
}

And this is my JavaScript snippet:

function populateStates(countryid)
{
  var cntryid=countryid.options[countryid.selectedIndex].value;
  var response=Signup.fillStateDdl(cntryid);

  var states=response.value;
}

When running the script, I encounter a "Microsoft JScript error: 'Signup' is undefined" message. What could be causing this issue?

Answer №1

It's important to separate your AjaxMethod in order for it to work correctly.

public partial class Signup : System.Web.UI.Page{
    protected void Page_Load(object sender, EventArgs e){
        Ajax.Utility.RegisterTypeForAjax(typeof(YourAjaxClass));
    }
}

public class YourAjaxClass {

    [Ajax.AjaxMethod()]
    public DataTable fillStateDdl(int countryid)
    {
      objState = new MyClass.State();
      DataTable dtState = new DataTable();
      objState.CountryId = Convert.ToInt32(countryid);
      dtState = objState.GetStateCountry().Tables[0];
      return dtState;
    }
}

You shouldn't RegisterTypeForAjax with an object that inherits from System.Web.Ui.Page as it will not function properly.

After separating, you can then call the method from JavaScript.

function fillStates(countryid)
{
  var cntryid=countryid.options[countryid.selectedIndex].value;
  var response=YourAjaxClass.fillStateDdl(cntryid);

  var states=response.value;
}

Answer №2

It seems like the missing piece needed for your ajax functionality is an http handler. To fix this, you can include the following snippet in your web.config file within the system.web section:


<system.web>
<-- 

Other configurations


 -->

<httpHandlers>
      <add verb="POST,GET" path="*.ashx" type="Ajax.AjaxHandlerFactory,Ajax"/>
</httpHandlers>

</system.web>  	

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