MVC drop down list save selected value onchange

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Hello;
How can I store a selected value in a drop down list (ASP.NET/MVC) within a session variable after the onchange event?
My code in ascx

HTML

<table width="150" border="0" cellspacing="0" cellpadding="0" style="margin-removed 1px; margin-removed 1px; margin-removed 1px;">
    <tr>       
        <td class="formrechinp">
            <%= Html.DropDownList("localSite",
                                          SiteHelper.GetSitesList((CultureInfo) Session["Culture"],
                                                                  menuState.Site_Name),
                                          new
                                              {
                                                  onChange = "javascript:ChangeLocalSite(this.value);"
                                              }) %>         
        </td>
    </tr>
</table>

My code in cs:

C#

public void ChangeLocalSite(String value)
       {
           Session["localSite"] = value;
       }

Posted 19-Jan-12 4:04am

teycir

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Kethu Sasikanth · Answer 1 · 2012-01-19T06:02:00

ChangeLocalSite is javascript method and it is available only on "that" html page. But the Session["localSite"] is in the (web)server.

To set Session variable you may have to execute a server method from javascript. This only possible way of doing this through ajax call. Donot be scared of ajax. It is very easy to learn and use an ajax method.

here is an example using jquery:

C#

   public void ChangeLocalSite(String value)
        {
            
         $.ajax({
          url: "MyMethod",
          dataType: 'json',
          type: 'POST',
          data:value,
          success: function (data) {
          if (data != null)
           alert(data);//should display found it!
          }
          }
         });
        }


//this is method is in YourController.cs
[HttpPost]
string MyMethod(string value)
{
    Session["localSite"] = value;
    return "found it!";
}