how to call a c# method on keyup event of textbox.

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C#

protected void Page_Load(object sender, EventArgs e)
    {
TextBox1.Attributes.Add("onkeyup", "fillsort();");
}

 protected void fillsort()
    {
        DataList1.DataSource = ob.dataset("select * from Course where course_title like '" + TextBox1.Text + "%'");
        DataList1.DataBind();
    }

problem is this, on keyup nothing happens.. i mean fillsort() not called!!
why??

Posted 10-Oct-11 4:21am

choudhary.sumit

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Anuja Pawar Indore · Answer 1 · 2011-10-10T04:32:00

I would suggest onkeyup to be used on client side and make an AJAX call to the server side

If you need server side then use OnTextChanged

XML

<asp:TextBox ID='Textbox1' runat='server' OnTextChanged=' fillsort'>
    </asp:TextBox>
public void fillsort(Object sender, EventArgs e)
{
//your code
}

Muralikrishna8811 · Answer 2 · 2011-10-10T04:35:00

Hi,

We cannot call server methods directly from javascript.

It can possible only when that method is pagemethod.But here there is a problem in this situation those data to datalists are not effect while you calling server method its just used for to do some process in server side.

We can do this by using Jquery

HTML

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script src="Scripts/jquery-1.4.1.js" type="text/javascript"></script>
    <script src="Scripts/jquery-1.4.1-vsdoc.js" type="text/javascript"></script>
    <script language ="javascript" >
       function f1() {
           $.get("default22.aspx?action=getval", { val1: $("#txtname").val }, function (data) {
               $("#datalistdiv").html(data);
           });
       }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <input type="text" id="txtname" onkeyup="f1()" />
        <br />
        <div id="datalistdiv">
        <asp:datalist id="DataList1" runat="server" width="789px" height="201px" xmlns:asp="#unknown">
            <HeaderTemplate>
                <table width="100%" align="center">
                    <tr>
                        <td>
                            Company ID
                        </td>
                        <td>
                            Company Name
                        </td>
                        <td>
                            Company Addr
                        </td>
                        <td>
                            Company Website
                        </td>
                    </tr>
            </HeaderTemplate>
            <itemtemplate>
                <tr>
                    <td>
                        <asp:label id="Lbluid" runat="server" text="<%#Eval("compid") %>"></asp:label>
                    </td>
                    <td>
                        <asp:label id="Lblpid" runat="server" text="<%#Eval("compname") %>"></asp:label>
                    </td>
                    <td>
                        <asp:label id="Label1" runat="server" text="<%#Eval("compoffaddr") %>"></asp:label>
                    </td>
                    <td>
                        <%#Eval("compsiteurl")%>
                    </td>
                </tr>
            </itemtemplate>
            <footertemplate>
                </footertemplate></table>
            
        </asp:datalist>
        </div>
    </div>
    </form>
</body>
</html>

And code behind file contains following code

C#

DataTable dt = new DataTable();
  protected void Page_Load(object sender, EventArgs e)
  {
      if (Request.QueryString["action"] != null)
      {

          Response.Clear();
          StringBuilder sb = new StringBuilder();
          StringWriter tw = new StringWriter(sb);
          HtmlTextWriter hw = new HtmlTextWriter(tw);
          DataList1.DataSource=dt;
          DataList1.DataBind();
          DataList1.RenderControl(hw);
          Response.Write(sb.ToString ());
          Response.End();


      }
  }

In the above code I used datatable(dt) for binding .you've to change whatever you want to bind

All the Best

how to call a c# method on keyup event of textbox.

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