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Nov 3rd, 2009

JSP Page Interaction

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Hi,

I'm trying to figure out how to pass parameters across JSP pages without using links. For some reason, I can only get null across...

Here is my code:
Page 1

JSP Syntax (Toggle Plain Text)
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>Test Page</title>
    </head>
    <body>
        <form name="testForm" action="Test.jsp">
            <select name='tableSelect' onChange='testForm.submit();' style="text-align:center">
                <option value='--Select Table--'>--Select Table--</option>
                <option value='CONFIG_SOURCE'>CONFIG_SOURCE</option>
                <option value='CONFIG_PROCESS'>CONFIG_PROCESS</option>
                <option value='CONFIG_PROCESS_SOURCE'>CONFIG_PROCESS_SOURCE</option>
                <option value='CONFIG_SAL_ROUTING'>CONFIG_SAL_ROUTING</option>
            </select>
        </form>
        <%
            out.println(request.getParameter("tableSelect"));
        %>
    </body>
</html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>Test Page</title>
    </head>
    <body>
        <form name="testForm" action="Test.jsp">
            <select name='tableSelect' onChange='testForm.submit();' style="text-align:center">
                <option value='--Select Table--'>--Select Table--</option>
                <option value='CONFIG_SOURCE'>CONFIG_SOURCE</option>
                <option value='CONFIG_PROCESS'>CONFIG_PROCESS</option>
                <option value='CONFIG_PROCESS_SOURCE'>CONFIG_PROCESS_SOURCE</option>
                <option value='CONFIG_SAL_ROUTING'>CONFIG_SAL_ROUTING</option>
            </select>
        </form>
        <%
            out.println(request.getParameter("tableSelect"));
        %>
    </body>
</html>

Page 2:

JSP Syntax (Toggle Plain Text)
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>Test Recieve Page</title>
    </head>
    <body>
        <%
            out.println(request.getParameter("tableSelect"));
        %>
    </body>
</html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>Test Recieve Page</title>
    </head>
    <body>
        <%
            out.println(request.getParameter("tableSelect"));
        %>
    </body>
</html>

Thanks,
-Ashton

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AshtonHogan

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Nov 3rd, 2009

Re: JSP Page Interaction

I can't see a problem with your page. Does the page submits? Does it go from page A to page B? Is the name of the Test.jsp correct and are the pages in the same folder?

Does onChange works? Should it be onchange?

Also you can try this:

document.testForm.submit();

javaAddict

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Nov 3rd, 2009

Re: JSP Page Interaction

They're both in the same folder. I also added method="post" on Page 1... When I change the selection on Page 1, it works, and it displays what I selected, then when I refresh Page 2, it says null.

AshtonHogan

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Nov 3rd, 2009

Re: JSP Page Interaction

Hi,

Alternatively, could you please tell me why this statement is wrong:

This is servlet code by the way...

JSP Syntax (Toggle Plain Text)
out.println("<select name='tableSelect' onChange=form.submit(); " + request.setAttribute('currentTable', request.getParameter('tableSelect')); + "' style='text-align:center'>");
out.println("<select name='tableSelect' onChange=form.submit(); " + request.setAttribute('currentTable', request.getParameter('tableSelect')); + "' style='text-align:center'>");

Thanks again,
-Ash

Last edited by AshtonHogan; Nov 3rd, 2009 at 9:46 am.

AshtonHogan

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Nov 3rd, 2009

Re: JSP Page Interaction

First of all request.setAttribute is void. It doesn't return a value to put it in a string.

Secondly:

Quote ...

They're both in the same folder. I also added method="post" on Page 1... When I change the selection on Page 1, it works, and it displays what I selected, then when I refresh Page 2, it says null.

You just said that it works. Then what is the problem? You cannot just go to a page, refresh it and expect to see data. You say you have Page1 and Page2. Which one is Test.jsp?
When you want to send data to a page you put it at the action. The request is sent to that page:

JSP Syntax (Toggle Plain Text)

<form action="somePage.jsp" >
 
</form>

The data will go to somePage.jsp. This is where you put your code. That page could be even the same. It makes no difference. But the data will go only there.

javaAddict

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