Fire ontextchanged() event of an asp:TextBox via Javascript

See: https://stackoverflow.com/a/3777/892536

Using this link, I was able to come up with something that produced the same results you are looking for. Not sure if this is okay for your application or not, but it works:

Aspx:

Changed the RefreshIt function to do a postback with an argument:

  <script type="text/javascript">
    function RefreshIt(selectObj) {
      __doPostBack('<%= Page.ClientID %>', selectObj.name);
    }
  </script>

</head>
<body>
  <form id="form1" runat="server">
  <div>

    <asp:TextBox runat="server" AutoPostBack="True" ID="txtG1" OnTextChanged="txtG1_TextChanged"
      onmouseout="javascript:RefreshIt(this);" />

    <br />
    <br />
    Text Changed:&nbsp;

    <asp:Label ID="Label1" runat="server"></asp:Label>

  </div>
  </form>
</body>

Code Behind:

Added ‘IPostBackEventHandler’ to the page and handled the ‘RaisePostBackEvent’ function:

public partial class _Default : System.Web.UI.Page, IPostBackEventHandler
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    public void RaisePostBackEvent(string Arg)
    {
        if (txtG1.ID == Arg)
            txtG1_TextChanged(txtG1, null);
    }

    protected void txtG1_TextChanged(object sender, EventArgs e)
    {
        Label1.Text = System.DateTime.Now.ToString();
    }
}

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