将setAttribute设置为带有servlet的复选框

Question

here is what I have:

JSP:

 <input type="checkbox" name="no_del_file" <% 
if ("True".equals(request.getParameter("no_del_file"))) {
    out.print("checked=\"checked\"");

} %>/>

<%String test = request.getParameter("no_del_file"); %>


 <p><%=test%></p>

Java:

 boolean cbState = request.getParameter( "no_del_file" ) != null;
            System.out.println("cbstate: "+cbState);
            if (cbState == true) {
                request.setAttribute("no_del_file", "checked");
                String checker=(String) request.getAttribute("no_del_file");
                System.out.println(checker);
            }

 RequestDispatcher dispatcher = request.getRequestDispatcher("/runButtonCommand.jsp");
            dispatcher.forward(request, response);

The problem is that the output is:

 cbstate: true
 checked

The test gives "on" as print after submitting the form

but the checkbox is not checked itself after the servlet returns the responds. The tick is removed for some reason.

Any ideas?

Answer 1

Try this

<% if(request.getParameter( "no_del_file" )=="checked"){%>
<input type="checkbox" id="no_del_file" name="no_del_file" value="no_del_file" checked>
<%}%>

Answer 2

I finally got it figured out... If someone is interested here it is

 <%String test = (String)request.getParameter("no_del_file"); %>
<%String checked = "";%>

<% 
if ("on".equals(test)) {
    checked="checked=\"on\"";

} %>
<input type="checkbox" name="no_del_file" <%=checked%>>

It returned on when checked