crerate ajax post back on servercontrol

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How i can crerate a ajax post back on servercontrol?i find this code to create ajax Postback on ClientControl.I want use a server control Button instead of "LookUpButton" client control?

ASP.NET

<head id="Head1"  runat="server">
  <title>Client Callback Example</title>
  <script type="text/ecmascript">
      function LookUpStock() {
          var lb = document.getElementById("ListBox1");
          try 
          {
            var product = lb.options[lb.selectedIndex].text;
            CallServer(product, "");
          }
          catch(err)
          {
            alert("Please select a product.");
          }
      }

      function ReceiveServerData(rValue) {
          document.getElementById("ResultsSpan").innerHTML = rValue;

      }
  </script>
</head>
<body>
  <form id="form1"  runat="server">
    <div>
      <asp:ListBox ID="ListBox1" Runat="server">
      <br />
      <br />
      <input type="button" value="Look Up Stock" id="LookUpButton"  önclick="LookUpStock()" />
      <br />
      <br />
      Items in stock: <span id="ResultsSpan"  runat="server">
      <br />
    </div>
  </form>
</body>

C#

public partial class ClientCallback : System.Web.UI.Page,System.Web.UI.ICallbackEventHandler
{
    protected System.Collections.Specialized.ListDictionary catalog;
    protected String returnValue;
    protected void Page_Load(object sender, EventArgs e)
    {
     
        string cbReference =
            Page.ClientScript.GetCallbackEventReference(this,          
            "arg","ReceiveServerData","context");                      
        string callbackScript;
        callbackScript = "function CallServer(arg, context)" +
            "{ " + cbReference + ";}";
        Page.ClientScript.RegisterClientScriptBlock(this.GetType(),
            "CallServer", callbackScript, true);

        catalog = new System.Collections.Specialized.ListDictionary();
        catalog.Add("monitor", 12);
        catalog.Add("laptop", 10);
        catalog.Add("keyboard", 23);
        catalog.Add("mouse", 17);

   
        ListBox1.DataSource = catalog;
        ListBox1.DataTextField = "key";
        ListBox1.DataBind();

    }

    public void RaiseCallbackEvent(String eventArgument)
    {
        if (catalog[eventArgument] == null)
        {
            returnValue = "-1";
        }
        else
        {
            returnValue = catalog[eventArgument].ToString();
        }
    }


    public String GetCallbackResult()
    {
        return returnValue;
    }
}

Posted 19-Aug-11 14:45pm

User 7427435

Updated 19-Aug-11 14:48pm

v3

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Syed Salman Raza Zaidi · Answer 1 · 2011-08-19T20:00:00

Solution 1

You can call JS function on server control like this,use this on PageLoad of the page

C#

ControlID.Attributes.Add("javascript: onclick,"return LookUpStock()");

Posted 19-Aug-11 20:00pm

Syed Salman Raza Zaidi

v2

RaisKazi · Answer 2 · 2011-08-19T21:45:00

Solution 2

Assign Javascript function "LookUpStock()" to "OnClientClick" event of Server Control as below.

VB

<asp:Button id="btnTest" OnClick="btnTest_OnClick" OnClientClick="LookUpStock()"
Text="Test" runat="server" />

Posted 19-Aug-11 21:45pm

RaisKazi