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Check box in Java

Posted on 2004-08-09
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Last Modified: 2013-11-24
I want ro design a JSP or Servlet (use J2SE). In this page I will receive records from Database, every records have 3 fileds( array rows on Web) , when display every fileds will have a checkbox (for examples: filed1, filed2, filed3). On the page If we check Field1 if True , Field2 and Field3 will automaltically check true. If check box of Filed2 and Filed3 is False, check box of Field1 is False.
How can I do that, this is the first time I use Java.
Please help me
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Question by:tuanhuong
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7 Comments
 
LVL 15

Accepted Solution

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Javatm earned 84 total points
ID: 11759160
Hi Friend;

If this is your 1st time in jsp, click on the link bellow for good JSP Tutorials :

http://www.jsptut.com/
http://www.apl.jhu.edu/~hall/java/Servlet-Tutorial/
http://java.sun.com/j2ee/1.4/docs/tutorial/doc/index.html

Hope that helps . . .
Javatm
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LVL 15

Expert Comment

by:Javatm
ID: 11759167

Here's a previous question about that :

http://www.experts-exchange.com/Web/Web_Languages/JSP/Q_20294941.html

Here's the html format :

<TD><INPUT type="checkbox" name="cprId_10611583" value="set">TD>
<TD><INPUT type="checkbox" name="cprId_10611584" value="set"></TD>
<TD><INPUT type="checkbox" name="cprId_10611585" value="set"></TD>

then in your jsp code :
...

<%
java.util.Enumeration paramNames = request.getParameterNames();
while(paramNames.hasMoreElements()) {
String paramName = (String) paramNames.nextElement();
if (paramName.indexOf("cprId") != -1) {
String id = paramName.substring(paramName.indexOf("_") + 1);
if (request.getParameter(paramName) != null && request.getParameter(paramName).equalsIgnoreCase("set")) {
// checkbox checked
}
}

Hope that helps . . .
Javatm
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LVL 11

Assisted Solution

by:sompol_kiatkamolchai
sompol_kiatkamolchai earned 83 total points
ID: 11759438
This is another option that you can do in client side by script which could off-load server side processing.

<html>
<body>
<form name="form1">
  <input type="checkbox" name="check1" onchange="if(this.checked){check2.checked=true;check3.checked=true;}">
  <input type="checkbox" name="check2" onchange="if(!this.checked && !check3.checked) {check1.checked=false;}">
  <input type="checkbox" name="check3" onchange="if(!this.checked && !check2.checked) {check1.checked=false;}">
</form>
</body>
</html>
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LVL 37

Assisted Solution

by:zzynx
zzynx earned 83 total points
ID: 11762139
>> If we check Field1 if True , Field2 and Field3 will automaltically check true. If check box of Filed2 and Filed3 is False, check box of Field1 is False.
>> How can I do that,

This little demo program shows the wanted logic:

Save the following in a file called CheckboxDemo.java.
Compile it, and run it.


/*
 * CheckboxDemo.java
 *
 */

public class CheckboxDemo extends javax.swing.JFrame {
   
    public CheckboxDemo() {
        initComponents();
        setLocationRelativeTo(null);
    }
   
    private void initComponents() {
        field1CheckBox = new javax.swing.JCheckBox();
        field2CheckBox = new javax.swing.JCheckBox();
        field3CheckBox = new javax.swing.JCheckBox();

        getContentPane().setLayout(new java.awt.FlowLayout());

        addWindowListener(new java.awt.event.WindowAdapter() {
            public void windowClosing(java.awt.event.WindowEvent evt) {
                exitForm(evt);
            }
        });

        field1CheckBox.setText("Field1");
        field1CheckBox.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                field1CheckBoxActionPerformed(evt);
            }
        });

        getContentPane().add(field1CheckBox);

        field2CheckBox.setText("Field2");
        field2CheckBox.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                field2CheckBoxActionPerformed(evt);
            }
        });

        getContentPane().add(field2CheckBox);

        field3CheckBox.setText("Field3");
        field3CheckBox.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                field3CheckBoxActionPerformed(evt);
            }
        });

        getContentPane().add(field3CheckBox);

        pack();
    }

    private void field3CheckBoxActionPerformed(java.awt.event.ActionEvent evt) {
        if ( !field2CheckBox.isSelected() && !field3CheckBox.isSelected() )  // if both field2 & field3 checkboxes are not selected...
            field1CheckBox.setSelected(false);                                         // also deselect the field1 check box
    }

    private void field2CheckBoxActionPerformed(java.awt.event.ActionEvent evt) {
        if ( !field2CheckBox.isSelected() && !field3CheckBox.isSelected() )  // same as above
            field1CheckBox.setSelected(false);
    }

    private void field1CheckBoxActionPerformed(java.awt.event.ActionEvent evt) {
        if (field1CheckBox.isSelected()) {         // if the field 1 check box is selected...
            field2CheckBox.setSelected(true);   // also select the field2
            field3CheckBox.setSelected(true);   // and the field3 check box
        }
    }
   
    private void exitForm(java.awt.event.WindowEvent evt) {
        System.exit(0);
    }
   
    public static void main(String args[]) {
        new CheckboxDemo().show();
    }
   
    private javax.swing.JCheckBox field1CheckBox;
    private javax.swing.JCheckBox field2CheckBox;
    private javax.swing.JCheckBox field3CheckBox;
}

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