How can i assign my JavaScript 'x' value to jsp expression. Below my JSP file code.

    <%@ taglib uri="/WEB-INF/tlds/struts-bean.tld" prefix="bean"%>
    <%@ taglib uri="/WEB-INF/tlds/struts-html.tld" prefix="html"%>
    
    <script language="JavaScript" type="text/JavaScript">
        var x=10;

        document.getElementById("bookid").value=x;
    </script>
    
  <% String value = x %>