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C#: Bind a DropDownList to IDictionary using AjaxPro

Implement an AjaxMethod to return IDictionary object

 

[AjaxPro.AjaxMethod]

public IDictionary AjaxGetIDictionary()

{

//Prepare the IDictionary object

}

– Use JavaScript to request the AjaxMethod AjaxGetIDictionary

MyAjaxClass. AjaxGetIDictionary (jsAjaxGetIDictionary_Callback);

– In the JavaScript function jsAjaxGetIDictionary_Callback add the IDictionary items to the DopDownList

function jsAjaxGetIDictionary (response)

{

     try

    {

         var DictionaryItems= response.value;

         if (DictionaryItems == null || typeof(DictionaryItems) != “object”)

        {

               return;

         }

         var myDropDownList = document.getElementById(“myDropDownList”);

         myDropDownList.options.length = 0;

         for (var i = 0; i < response.value.length; ++i)

         {

             myDropDownList.options[myDropDownList.options.length] = new Option(response.value[i].Value,response.value[i].Key);

           }

    }

    catch(e)

   {

   }

}

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Posted by on May 1, 2009 in Programming

 

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Using AJAX Pro (step by step):

This is a simple guide for using the AJAX Pro in VS2003

 

1-     Add the AJAXPro.dll to your bin folder

 

         Right click on the bin folder and select “Add Reference… ”

 

 

 

         Select the browse tab and browse for the AjaxPro.dll folder to select it and click ok

 

 

2-     Add the following to your web.config file

 

<httpHandlers>

          <add verb=POST,GET path=ajaxpro/*.ashx type=AjaxPro.AjaxHandlerFactory, AjaxPro.2/>

</httpHandlers>

 

3-     Create a Class to write your Ajax functions

         Right Click on the App_Code folder and select “Add New Item…”

 

 

         Select “Class” from the templates; enter a name for your class and click Add

 

 

4-     In your class imports the AjaxPro Library and create your function as the following:

 

       <AjaxPro.AjaxMethod(AjaxPro.HttpSessionStateRequirement.ReadWrite)> _

Public Function AjaxFunction(ByVal strVariable As String) As String

 

5-     In the ASP Page that need to use the Ajax Function:

 

         Import your Ajax Class library

         Add a function to the body onload event

<body   onload=”BodyOnLoad()”

         In the BodyOnLoad assign a variable to your class

 

function BodyOnLoad()

                    {

                       LPMyAjax = IMGSLB.MyAjax;

     }

 

 

6-     Now you can call the ajax function from JavaScript

 

    function jsCallAjax(strValue)

    {

        try

        {

           

            LPMyAjax.AjaxFunction(strValue,jsCallAjaxCallback);

        }

        catch(err)

              {

            alert(err.message)

              }

              finally

              {

                    

              }

    }

 
1 Comment

Posted by on July 16, 2008 in General, Photography

 

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How to use asynchronous methods in AJAX

so this is a Java Script code that use synchronous ajaxpro Method

 var toReturn = MyAjaxClass.MyAjaxMethod(sVariable).value;

to change it to use Asynchronous method it would look like this:

MyAjaxClass.MyAjaxMethod(sVariable,MyAjaxMethodCallback);

MyAjaxMethodCallback is a Java Script function to handle the return value from the Ajax method, it could be like this

 
function MyAjaxMethodCallback(toReturn)
{
        alert(toReturn.value);
}

That’s it….

 

 
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Posted by on May 27, 2008 in General, Programming

 

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