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Thread: See if checkbox is checked

  1. #1
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    Default See if checkbox is checked

    The page below will display 2 checkboxes with the values for user with ID 1.

    Movies
    Series

    Now I have some values in my DB that make sure both of these boxes are checked.

    TABLE 'type'
    -----------
    typeID        typeName
    1                Movies
    2                Series
     
    TABLE 'user'
    ------------
    userID        userName        password
    1               admin             admin
    2               test               test
     
    TABLE 'usersType'
    usersTypeID        userID        typeID        checked
    1                        1                1                yes
    2                        1                2                yes
    3                        2                1                yes

    Below is the code for the preferences.jsp page

    <%@page contentType="text/html; charset=iso-8859-1" language="java"%>
    <%@ page import="java.sql.*" %>
    <%@ page import="java.io.*" %>
     
    <!DOCTYPE html>
    <html>
        <head>
            <title>Preference Page</title>
        </head>
        <body bgcolor="#0099CC">
            <div id="navigation">
                <ul class="top-level">
                    <li><a href="success.jsp">Home</a></li>
                    <li><a href="preferences.jsp">Preferences</a></li>
                    <li><a href="recommendations.jsp">Recommendations</a></li>
                </ul>
            </div>
            <div id="wrapper">
                <%
                     Connection connection = null;
                     Statement statement = null;
                     ResultSet rs = null;
                     Class.forName("org.apache.derby.jdbc.ClientDriver").newInstance();
                     connection = DriverManager.getConnection("jdbc:derby://localhost:1527/recommendation;create=true;user=root;password=root");
                     statement = connection.createStatement();                 
                %>
                <form name="frmPreferences" action="updateDatabase.jsp" method="post">
                    <table>
                        <tr>
                            <td>Do you like to watch movies or series? Or both?</td>
                        </tr>
                        <%
                            String QueryString = "SELECT * FROM APP.TYPE LEFT JOIN APP.userstype ON APP.TYPE.typeID = APP.userstype.typeID AND APP.userstype.userID = " + session.getAttribute("ID");
                            rs = statement.executeQuery(QueryString);
     
                            while(rs.next()){
                                String checked = rs.getString(6);
                        %>
                        <tr>
                            <td><input type="checkbox" name="type"<% if(checked == null){ checked = ""; } if(checked.equals("yes")){ out.print(" checked='checked'"); }else{ out.print("");}%> value="<%=rs.getInt(1)%>" /><%=rs.getString(2)%></td>
                        </tr>
                        <%
                            }
                            rs.close();
                        %>
                    </table>
                </form>
                        <%
                            // close all connections
                            statement.close();
                            connection.close();
                        %>
                <br /><br />
                <a href="logout.jsp"><b>Logout</b></a>
            </div>
        </body>
    </html>

    Now, I want to update these tables via this page. But I don't know how to see if the checkbox is really checked or not.

    <%@page contentType="text/html; charset=iso-8859-1" language="java"%>
    <%@ page import="java.sql.*" %>
    <%@ page import="java.io.*" %>
     
    <%
         Connection connection = null;
         PreparedStatement ps = null;
         Statement statement = null;
         ResultSet rs = null;
         Class.forName("org.apache.derby.jdbc.ClientDriver").newInstance();
         connection = DriverManager.getConnection("jdbc:derby://localhost:1527/recommendation;create=true;user=root;password=root");
     
         /*statement = connection.createStatement();
         String QueryString = " ";
         rs = statement.executeQuery(QueryString);*/
     
         // get the checkbox values
         String c[]= request.getParameterValues("type");
     
        // I'M KINDA STUCK HERE...
    %>


  2. #2
    Crazy Cat Lady KevinWorkman's Avatar
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    Default Re: See if checkbox is checked

    If I understand your question correctly, the API is your friend: Java Platform SE 6

    Hint: You're looking for a method that tells you whether the JCheckBox is selected, right?
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  3. #3
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    Default Re: See if checkbox is checked

    if you read my post you'll see i want to see if an html checkbox is checked

  4. #4
    Crazy Cat Lady KevinWorkman's Avatar
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    Default Re: See if checkbox is checked

    Quote Originally Posted by kney View Post
    if you read my post you'll see i want to see if an html checkbox is checked
    How silly of me to assume a question posted on a Java forum was related to Java. Anyway, much luck to you.
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  5. #5
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    Default Re: See if checkbox is checked

    lol don't even bother then..
    there isn't any java code to read an html checkbox?
    cuz that's what i need

  6. #6
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    Default Re: See if checkbox is checked

    I guess I'm a bit confused. If you're working in JSP, won't the value of the checkbox selection be in the request?
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    Default Re: See if checkbox is checked

    Hi kney,

    This is exactly what you need: checkbox value to servlet (Servlets forum at JavaRanch)

    Spring 3
    Last edited by cafeteria84; January 22nd, 2012 at 04:01 PM.

  8. #8
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    Default Re: See if checkbox is checked

    @KevinWorkman

    I'll explain it a bit further
    Like I have it now, my checkboxes are checked because of the values in the DB.
    If I deselect the second checkbox my database should change to

    TABLE 'usersType'
    usersTypeID        userID        typeID        checked
    1                        1                1                yes
    2                        1                2                no
    3                        2                1                yes

    But since I can only get the value of a selected checkbox, how can I see if a checkbox is actually selected or not?
    If I deselect the 2nd checkbox I only get value "1" from this code.

    // get the checkbox values
    String c[]= request.getParameterValues("type");

  9. #9
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    Default Re: See if checkbox is checked

    If I deselect the 2nd checkbox I only get value "1" from this code.
    The reason might be, that you have created all the check boxes on your webpage dynamically with same name. So, if there are three check boxes of the same name, it doesn't know which one is checked and which not. Also, in java you can check if the checkbox is selected or not.
    It's not Java's fault but actually your code's or logic's fault.

  10. #10
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    Default Re: See if checkbox is checked

    that's exactly what I did. lol
    well.. my logic isn't logical :p

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