I would like to have 6 checkboxes, and do some stuff after a botton is pressed do you have an example?
 
Also can an array of checkboxes be used?
 
I want to avoid:
 
Checkbox cb1 = new Checkbox("A");
 
Checkbox cb2 = new Checkbox("B");
 
I am doing something like:
 
JPanel panel = new JPanel();
 
JFrame frame = new JFrame("the title");
 
final JTextArea txt = new JTextArea(20, 30);
 
Button boton = new Button( "DO");
 
panel.add(txt);
 
panel.add(boton);
 
frame.add(panel);
 
frame.add(panel);
 
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 
frame.setSize(500, 500);
 
frame.setVisible(true);
 
boton.addActionListener(new ActionListener() {
 
public void actionPerformed(ActionEvent e) {
 
txt.setText("");
 
/*
 
How would be the logic of array of checkboxes
 
if checbox[0] is active do action 0
 
if checbox[1] is active do action 1
 
if checbox[2] is active do action 2
 
if checbox[3] is active do action 3
 
if checbox[4] is active do action 4
 
if checbox[5] is active do action 5
 
if checbox[0] and checbox[1] is active do action 6
 
if checbox[0] and checbox[2] is active do action 7
 
if checbox[0] and checbox[3] is active do action 8
 
etc...
 
*/
 
}
 
});
 
解决方案
 
You can do something like this:
 
List checkboxes = new ArrayList();
 
String labels[] = {"A", "B", "C", "D", "E", "F"};
 
for (int i = 0; i < labels.length; i++) {
 
Checkbox checkbox = new Checkbox(labels[i]);
 
checkboxes.add(checkbox); //for further use you add it to the list
 
}
 
And then the List use it in your ActionListener to reference the checkboxes. You can also use an array if you like.

 
编写程序，通过复选框控件数组事先选择用户爱好信息的复选框，在该程序中，要求界面中的复选框数量可以根据指定复选框名称的字符串数组的长度来自动调节。
 
思路如下：
 
创建JPanel面板对象；
 
使用JPanel类的setLayout(0,4)方法设置网格布局管理器，即列数为4，行数自动调节；
 
创建一个字符串型一维数组作为控件文本数组；
 
创建一个JCheckBox型一维数组作为控件数组；
 
使用for循环遍历控件数组，初始化数组中的复选框组件，使用JPanel类的add()方法把数组元素(即每个复选框)添加到面板中。
 
代码如下：
 
package cn.edu.xidian.crytoll;
 
import java.awt.BorderLayout;
 
import java.awt.EventQueue;
 
import java.awt.GridLayout;
 
import javax.swing.JCheckBox;
 
import javax.swing.JFrame;
 
import javax.swing.JPanel;
 
import javax.swing.border.EmptyBorder;
 
import javax.swing.JLabel;
 
import javax.swing.UIManager;
 
public class CheckBoxArray extends JFrame {
 
/**
 
*
 
*/
 
private static final long serialVersionUID = -5338362310060106193L;
 
private JPanel contentPane;
 
private JPanel panel;
 
/**
 
* Launch the application.
 
*/
 
public static void main(String[] args) {
 
try {
 
UIManager
 
.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
 
} catch (Throwable e) {
 
e.printStackTrace();
 
}
 
EventQueue.invokeLater(new Runnable() {
 
public void run() {
 
try {
 
CheckBoxArray frame = new CheckBoxArray();
 
frame.setVisible(true);
 
} catch (Exception e) {
 
e.printStackTrace();
 
}
 
}
 
});
 
}
 
/**
 
* Create the frame.
 
*/
 
public CheckBoxArray() {
 
setTitle("通过复选框控件数组实现添加多个复选框控件");
 
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 
setBounds(100, 100, 409, 331);
 
contentPane = new JPanel();
 
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
 
contentPane.setLayout(new BorderLayout(0, 0));
 
setContentPane(contentPane);
 
JLabel label = new JLabel(
 
"你的爱好有哪些：");
 
contentPane.add(label, BorderLayout.NORTH);
 
contentPane.add(getPanel(), BorderLayout.CENTER);
 
}
 
private JPanel getPanel() {
 
if (panel == null) {
 
panel = new JPanel();// 创建面板对象
 
panel.setLayout(new GridLayout(0, 4));// 设置网格布局管理器
 
// 创建控件文本数组
 
String[] labels = { "足球", "篮球", "魔术", "乒乓球", "看电影", "魔兽世界", "CS战队",
 
"羽毛球", "游泳", "旅游", "爬山", "唱歌", "写博客", "动物世界", "拍照", "弹吉他",
 
"读报纸", "飙车", "逛街", "逛商场", "麻将", "看书", "上网看资料", "新闻", "军事",
 
"八卦", "养生", "饮茶" };
 
JCheckBox[] boxs = new JCheckBox[labels.length];// 创建控件数组
 
for (int i = 0; i < boxs.length; i++) {// 遍历控件数组
 
boxs[i] = new JCheckBox(labels[i]);// 初始化数组中的复选框组件
 
panel.add(boxs[i]);// 把数组元素(即每个复选框)添加到面板中
 
}
 
}
 
return panel;
 
}
 
}
 
效果如图：
 

 
我发布了一系列复选框.而我无法让它工作.我没有在foreach循环中包含正确的语法来保持简单.但它正在发挥作用.我通过尝试用文本字段而不是复选框来做同样的事情来测试,并且它与文本字段一起工作.
 
foreach{
 
echo'
 
';
 
}
 
?>
 
这是不起作用的部分.它回应’邀请’而不是数组.
 
if(isset($_POST['invite'])){
 
$invite = $_POST['invite'];
 
echo $invite;
 
}
 
解决方法:
 
你的$_POST数组包含了invite数组,所以把它读出来
 
if(isset($_POST['invite'])){
 
$invite = $_POST['invite'];
 
echo $invite;
 
}
 
?>
 
因为它是一个数组而无法工作.您必须遍历数组才能获得所有值.
 
if(isset($_POST['invite'])){
 
if (is_array($_POST['invite'])) {
 
foreach($_POST['invite'] as $value){
 
echo $value;
 
}
 
} else {
 
$value = $_POST['invite'];
 
echo $value;
 
}
 
}
 
?>
 
标签：html,php,arrays,forms,post
 
来源： https://codeday.me/bug/20190923/1813619.html

 
尝试这个：
 
$a = mysql_query("
 
SELECT g.galleryname FROM gallery AS g, multigalleries AS m
 
WHERE g.galleryname = 'gallery1' AND FIND_IN_SET(g.galleryname, m.galleries)
 
");
 
$b = mysql_fetch_assoc($a);
 
echo '
 
if($b['galleryname'])
 
{
 
echo ' checked="checked"';
 
}
 
echo '>';
 
编辑： H2>
 
$result = mysql_query("
 
SELECT g.galleryname, m.galleryname AS name FROM gallery AS g
 
LEFT JOIN (SELECT galleryname, galleries FROM multigalleries) AS m ON
 
FIND_IN_SET(g.galleryname, m.galleries)
 
");
 
while($row = mysql_fetch_assoc($result))
 
{
 
$checked = '';
 
if($row['name'])
 
{
 
$checked = ' checked="checked"';
 
}
 
echo '
 
'.$row['galleryname'].'';
 
}