Question

I want to know a method how can I send 1 specified item for JSTL’s foreach to other JSP or servlet, to print detailed info about that item.

Giving followin code:

    <c:forEach var="note" items="${notes}">
        <tr>
            <td>${note.getTitle()}</td>
            <td>${note.getRealDate()}</td>
            <td>${note.getUserDate()}</td>
            <td>
                <form action="showdetails.jsp">
                    <input type="submit" value="show details" name="details" />
                </form> 
            </td>
        </tr>
    </c:forEach>

I need to replace my form, or remake it, to get something that does the job, and I’m out of ideas…

ah, btw. Note has method shown above + showDetails() with String return. And I want to display them all, or just do String all = note.toString(); in jsp/servlet

Answer 1

Just pass an identifier as request parameter and change the URL to be a servlet one. If you insist to use a submit button, pass the identifier as a hidden input field:

<form action="showdetails">
    <input type="hidden" name="id" value="${note.id}" />
    <input type="submit" name="details" value="show details" />
</form>

In the servlet which is mapped on an URL pattern of /showdetails just do the following job in doGet() method:

String id = request.getParameter("id");
Note note = noteService.find(id);
request.setAttribute("note", note);
request.getRequestDispatcher("/WEB-INF/showdetails.jsp").forward(request, response);

In the showdetails.jsp you can then use ${note} to access the selected Note.

Exactly the above servlet is also useable when you use a link instead as Bozho suggests, with only one little difference, in the servlet you’re able to preprocess the request (to find and prepare the right Note object for display).

<a href="showdetails?id=${note.id}">show details</a>

See also:

• Our servlets wiki page