var vquery = window.location.search.substring(1);alert(vquery);
<html xmlns="http://www.w3.org/1999/xhtml" ><head runat="server"> <title>Passing Query String Values between pages</title> <script type="text/javascript" language="javascript"> function PassQueryStringValue() { var vQueryStringVal = "Welcome"; alert("DisplayQueryString.aspx?Qid=" + vQueryStringVal+"&dotnetspider"); window.open("DisplayQueryString.aspx?Qid=" + vQueryStringVal+"& Qid1=dotnetspider"); } </script></head><body> <form id="form1" runat="server"> <div> <asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="PassQueryStringValue();" /> </div> </form></body></html>
<html xmlns="http://www.w3.org/1999/xhtml" ><head runat="server"> <title>Untitled Page</title> <script language="javascript" type="text/javascript">function GetQueryStringValue() { var vquery = window.location.search.substring(1); var vparms = vquery.split('&'); for (var i=0; i <vparms.length; i++) { var vpos = vparms[i].indexOf('='); if (vpos > 0) { var vkey = vparms[i].substring(0,vpos); var vval = vparms[i].substring(vpos+1); alert(vval); } }}</script></head><body onload="GetQueryStringValue()"> <form id="form1" runat="server"> <div> </div> </form></body></html>