Redirect to Error page if QueryString in empty using jQuery in ASP.Net

Hi jovceka,

Check this example. Now please take its reference and correct your code.

HTML

Default

<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript">
    $(function () {
        $("#btnsearch").click(function () {
            var searchtxt = $('#txtsearch').val();
            //var url = "Search.aspx?s=" + encodeURIComponent(searchtxt);
            window.location.href = searchtxt;
        });
    });
</script>
<input type="text" id="txtsearch" style="width: 150px" value="Search.aspx" />
<input type="button" value="Search" id="btnsearch" />

Search

<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript">
    window.onload = function () {
        if (window.location.search != '' && window.location.search.split('?').length > 1) {
            var param = window.location.search.split('?')[1];
            if (param != '' && param.split('=')[1] != undefined && param.split('=')[1] != '') {
                var value = decodeURIComponent(param.split('=')[1]);
                // Your Ajax Call.
                alert("Serach value is " + value);
            } else {
                window.location.href = "Error.aspx";
            }
        } else {
            window.location.href = "Error.aspx";
        }
    }
</script>

Error

<h3>Error</h3>

Screenshot