Getting "Microsoft JScript runtime error: Object expected"

[EdEvans]

have the following code on a page:

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            Page.ClientScript.RegisterStartupScript(this.GetType(), "DoPreview",
                    "<script language=javascript>\r\n" +
                        "<!-- \r\n" +
                        "function DoPreview()\r\n" +
                            "{\r\n" +
                                "debugger;\r\n" +
                                "var win=null;\r\n" +
                                "var em = 'email=' + document.getElementById('ctl00_PlaceHolderMain_txtFriendsEmail').value;\r\n" +
                                "var fn = '&fname=' + document.getElementById('ctl00_PlaceHolderMain_txtFriendsFirstName').value;\r\n" +
                                "var ln = '&lname=' + document.getElementById('ctl00_PlaceHolderMain_txtFriendsLastName').value\r\n;" +
                                "var pn = '&phone=' + document.getElementById('ctl00_PlaceHolderMain_txtFriendsPhone').value;\r\n" +
                                "var a1 = '&addr1=' + document.getElementById('ctl00_PlaceHolderMain_txtFriendsAddress').value;\r\n" +
                                "var a2 = '&addr2=' + document.getElementById('ctl00_PlaceHolderMain_txtFriendsAddress2').value;\r\n" +
                                "var ct = '&city=' + document.getElementById('ctl00_PlaceHolderMain_txtFriendsCity').value;\r\n" +
                                "var st = '&state=' + document.getElementById('ctl00_PlaceHolderMain_txtFriendsState').value;\r\n" +
                                "var zp = '&zip=' + document.getElementById('ctl00_PlaceHolderMain_txtFriendsZipCode').value;\r\n" +
                                "var cy = '&cntry=' + document.getElementById('ctl00_PlaceHolderMain_txtFriendsCountry').value;\r\n" +
                                "var pm = '&pmsg=' + document.getElementById('ctl00_PlaceHolderMain_txtPersonalMessage').value;\r\n" +
                                "var url = 'DoPreview.aspx?' + em + fn + ln + pn + a1 + a2 + ct + st + zp + cy + pm;\r\n" +
                                "win = window.open(url, null, 'height=700, width=800,status= no, resizable= yes, scrollbars=yes,toolbar=no,location=no,menubar=no');\r\n" +
                                "win.focus();\r\n" +
                            "}\r\n" +
                            " -->\r\n" +
                    "</script>\r\n", false);
 
            btnPreview.Attributes.Add("OnClick", "DoPreview()");
 
        }
    }

the problem arises when I first open the window by pressing the btnPreview. The script gets called, I generate a url dynamically, adding a query string to it. The windown opens successfully the first time, however, if I close the popped up window and press that button again, it gives me the error described in the subject.

Anybody have any ideas why I might be running into this problem?

Thanks.

[acoder]

What line do you get the error on?

[EdEvans]

I get it on the following line:

btnPreview.Attributes.Add("OnClick", "DoPreview()");

[acoder]

OK, what does the code look like client-side (viewing in the browser)? You should be able to get the generated source code by selecting View Source or View Page Source.

[EdEvans]

Aha! OK, will do....

[Siddarth Tamagond]

Guys, I faced the same error, In my case no StumbleUpon tool was installed. I solved it by dissabling Javascript debugging. Go to IE browser -> Tools->Internet Options -> Advanced -> check 'Dissable script debugging(internet exploere) option. this refers to IE 7.

[acoder]

But it's a JavaScript problem, so disabling debugging won't help solve it.

[Parul Gupta]

This line should be like this:
btnPreview.Attributes.Add("OnClick", "DoPreview();");


I guess you have forgotten to add semicolon after function name.