'event.returnValue=false' equivalent for Firefox

nitinp · February 5th, 2007, 11:56 AM

:)hello,

I have to stop processing on page validation in javascript in Firefox.
here is my code. What is 'event.returnValue=false' equivelent for Firefox?

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            Button1.Attributes.Add("onclick", "javascript:checkForm();");
        }
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        LabelError.Text = System.DateTime.Now.ToString();
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
    <script type="text/javascript">
        function checkForm()
        {
            if(document.getElementById('txtUserName').value =="")
            {
                if (window.event) //IE
                {
                 alert("1");
                 window.event.returnValue = false;
                }
                else //Firefox
                {
                 alert("2");
                 window.event.preventDefault(); // <-- What should I write here instead
                }
            }
        }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div align="center">
        <asp:TextBox ID="txtUserName" runat="server"></asp:TextBox><br/>
        <asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" /><br />
        <asp:Label ID="LabelError" runat="server"></asp:Label>
    </div>
    </form>
</body>
</html>

Thanks