Set Rewrite URL in JavaScript using Page.GetRouteUrl function in ASP.Net

hello all

i want to rewrite url through java script .

for example my global asax look like 

public static void RegisterRoutes(RouteCollection routeCollection)
    {  routeCollection.MapPageRoute("search", "search/{Cat_Id}", "~/Default2.aspx");
    }  

i have cat id in java script when i call javascript it  bind and it should   be GetRouteUrl to redirect .

when i simple call page name then it is working 

window.location.href = "product.aspx?search=" + i.item.label + i.item.category;

but when i used GetRouteUrl  then its not working .help me anyone

    window.location.href = '<%# Page.GetRouteUrl("search", new  {Cat_Id = "Cat_Id"})%>'.replace('Cat_Id', i.item.value);