Java JOptionPane-检查用户输入并防止关闭,直到满足条件
请有人告诉我,如果不满足用户输入字段的条件,是否有一种方便的方法可以防止单击“确定”时关闭Java JOptionPane-检查用户输入并防止关闭,直到满足条件,java,swing,joptionpane,Java,Swing,Joptionpane,请有人告诉我,如果不满足用户输入字段的条件,是否有一种方便的方法可以防止单击“确定”时关闭JOptionPane 还是我别无选择,只能使用JFrame 我的验证逻辑到目前为止。似乎不起作用,因为按钮由于某种原因是一次性可点击的 final JDialog dialog3 = new JDialog(OmniGUI.getFrame(), "Create new Node - id:" + newNodeID); dialog3.setContentPane(theOPane); dialog3.
JOptionPane
还是我别无选择,只能使用JFrame
我的验证逻辑到目前为止。似乎不起作用,因为按钮由于某种原因是一次性可点击的
final JDialog dialog3 = new JDialog(OmniGUI.getFrame(), "Create new Node - id:" + newNodeID);
dialog3.setContentPane(theOPane);
dialog3.setDefaultCloseOperation(JDialog.DO_NOTHING_ON_CLOSE);
theOPane.addPropertyChangeListener(new PropertyChangeListener(){
public void propertyChange(PropertyChangeEvent e) {
if(e.getSource() == theOPane){
String val = (String) ((JOptionPane) e.getSource()).getValue();
if(val=="Create"){
System.out.println("Checking content");
if(!valid){
System.out.println("closing the window");
dialog3.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
dialog3.removeAll();
dialog3.dispatchEvent(new WindowEvent(dialog3, WindowEvent.WINDOW_CLOSING));
}
}
}
}
});
dialog3.setLocation(p);
dialog3.pack();
dialog3.setVisible(true);
您可以创建自己的自定义
JDialog
,以在关闭或继续之前检查用户输入等。请参阅此链接:
默认情况下,当用户单击JOptionPane created按钮时
对话框关闭。但是如果你想在之前检查用户的答案呢
关闭对话框?在这种情况下,您必须实现自己的属性
更改侦听器,以便当用户单击按钮时,对话框不会
不会自动关闭
下面是我举的一个例子:
如果键入错误/无文本并单击“输入”,将显示验证消息:
如果单击X关闭对话框或单击取消,也将显示验证消息:
如果输入了正确的文本(在本例中为“David”),并单击enter,则会显示一条消息并退出JDialog
:
CustomDialog.java:
import java.awt.*;
import java.awt.event.*;
import java.beans.*;
import javax.swing.JDialog;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
class CustomDialog extends JDialog
implements ActionListener,
PropertyChangeListener {
private String typedText = null;
private JTextField textField;
private String magicWord;
private JOptionPane optionPane;
private String btnString1 = "Enter";
private String btnString2 = "Cancel";
/**
* Returns null if the typed string was invalid; otherwise, returns the
* string as the user entered it.
*/
public String getValidatedText() {
return typedText;
}
/**
* Creates the reusable dialog.
*/
public CustomDialog(Frame aFrame, String aWord) {
super(aFrame, true);
magicWord = aWord.toUpperCase();
setTitle("Quiz");
textField = new JTextField(10);
//Create an array of the text and components to be displayed.
String msgString1 = "What was Dr. SEUSS's real last name?";
String msgString2 = "(The answer is \"" + magicWord
+ "\".)";
Object[] array = {msgString1, msgString2, textField};
//Create an array specifying the number of dialog buttons
//and their text.
Object[] options = {btnString1, btnString2};
//Create the JOptionPane.
optionPane = new JOptionPane(array,
JOptionPane.QUESTION_MESSAGE,
JOptionPane.YES_NO_OPTION,
null,
options,
options[0]);
//Make this dialog display it.
setContentPane(optionPane);
//Handle window closing correctly.
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
//Ensure the text field always gets the first focus.
addComponentListener(new ComponentAdapter() {
@Override
public void componentShown(ComponentEvent ce) {
textField.requestFocusInWindow();
}
});
//Register an event handler that puts the text into the option pane.
textField.addActionListener(this);
//Register an event handler that reacts to option pane state changes.
optionPane.addPropertyChangeListener(this);
pack();
}
/**
* This method handles events for the text field.
*/
@Override
public void actionPerformed(ActionEvent e) {
optionPane.setValue(btnString1);
}
/**
* This method reacts to state changes in the option pane.
*/
@Override
public void propertyChange(PropertyChangeEvent e) {
String prop = e.getPropertyName();
if (isVisible()
&& (e.getSource() == optionPane)
&& (JOptionPane.VALUE_PROPERTY.equals(prop)
|| JOptionPane.INPUT_VALUE_PROPERTY.equals(prop))) {
Object value = optionPane.getValue();
if (value == JOptionPane.UNINITIALIZED_VALUE) {
//ignore reset
return;
}
//Reset the JOptionPane's value.
//If you don't do this, then if the user
//presses the same button next time, no
//property change event will be fired.
optionPane.setValue(
JOptionPane.UNINITIALIZED_VALUE);
if (btnString1.equals(value)) {
typedText = textField.getText();
String ucText = typedText.toUpperCase();
if (magicWord.equals(ucText)) {
JOptionPane.showMessageDialog(this, "Correct answer given");
exit();
} else {
//text was invalid
textField.selectAll();
JOptionPane.showMessageDialog(this,
"Sorry, \"" + typedText + "\" "
+ "isn't a valid response.\n"
+ "Please enter "
+ magicWord + ".",
"Try again",
JOptionPane.ERROR_MESSAGE);
typedText = null;
textField.requestFocusInWindow();
}
} else { //user closed dialog or clicked cancel
JOptionPane.showMessageDialog(this, "It's OK. "
+ "We won't force you to type "
+ magicWord + ".");
typedText = null;
exit();
}
}
}
/**
* This method clears the dialog and hides it.
*/
public void exit() {
dispose();
}
public static void main(String... args) {
//create JDialog and components on EDT
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new CustomDialog(null, "David").setVisible(true);
}
});
}
}
一件事是,它只在您想要阻止关闭或验证然后关闭时才有帮助。。。基于该教程中的示例代码的解决方案,如果验证失败,我无法让它进行验证并保持打开状态
回想起来,我认为我的第一次尝试失败的原因可能是因为它使用了JOptionPanel.createDialog()(而不是示例代码所使用的)。也许让JOptionPanel创建自己的JDialog会在事件处理工作中设置一些“后台”依赖项。。。无聊的。无论如何,我现在得到了我想要的:大卫·克鲁坎普的代码对我非常有用
我之所以发布我的解决方案,是因为它处理PropertyChangeEvents的方式与David不同,因此它可能对某些人有用。您将看到大部分代码都与他的相同(谢谢David)
此类检查文件是否存在,并允许用户提供新名称或取消。它使用构造函数中的一些参数来验证用户的输入。验证是
如果(!Files.exists(rootPathArg.resolve(input)){//关闭对话框}
class GetPathNameDialog extends JDialog implements ActionListener, PropertyChangeListener {
/**
* contains the users input
*/
private JTextField textField;
/**
* the option pane that holds all fields and controls in this dialog
*/
private JOptionPane optionPane;
/**
* label for the left button that represents "OK"
*/
private String button1Str;
/**
* label for the right button that represents "Cancel"
*/
private String button2Str;
/**
* path containing the named entity to be renamed.
*/
private Path rootPath;
/**
* Creates the reusable dialog.
*/
/**
* Creates the dialog, panel and all GUI components, sets up listeners.
*
* @param rootPath the path where the file or folder we are renaming lives
* @param initialText the initial text to display in the text field (i.e. current name)
* @param title title of the JDialog itself
* @param textFieldWidth number of columns in the JTextField that will contain the file/folder name
* @param promptStr the propmt to display in the panel
* @param button1Str the label for the "OK" button
* @param button2Str the label for the "Cancel" button
*/
public GetPathNameDialog(Path rootPath, String initialText, String title, int textFieldWidth, String promptStr, String button1Str, String button2Str) {
super((Frame) null, true);
// init class variables
this.rootPath = rootPath;
this.button1Str = button1Str;
this.button2Str = button2Str;
setTitle(title);
textField = new JTextField(textFieldWidth);
textField.setText(initialText);
//Create an array of the text and components to be displayed.
Object[] array = {promptStr, textField};
//Create an array specifying the number of dialog buttons
//and their text.
Object[] options = {button1Str, button2Str};
//Create the JOptionPane.
optionPane = new JOptionPane(
array,
JOptionPane.QUESTION_MESSAGE,
JOptionPane.YES_NO_OPTION,
null,
options,
options[0]);
//Make this dialog display it.
setContentPane(optionPane);
//Handle window closing correctly.
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
//Ensure the text field always gets the first focus.
addComponentListener(new ComponentAdapter() {
@Override
public void componentShown(ComponentEvent ce) {
textField.requestFocusInWindow();
}
});
// Register an event handler that puts the text into the option pane INPUT_VALUE_PROPERTY
textField.addActionListener(this);
// Register an event handler that reacts to option pane state changes.
optionPane.addPropertyChangeListener(this);
// tell this dialog to display close to the current mouse pointer
setLocation(MouseInfo.getPointerInfo().getLocation());
pack();
}
/**
* This method handles events for the text field.
*/
@Override
public void actionPerformed(ActionEvent e) {
// this will fire a INPUT_VALUE_PROPERTY PropertyChangeEvent... takes the user input to the validaton code in the property handler
optionPane.setInputValue(textField.getText());
}
/**
* This method reacts to property changes.
*/
@Override
public void propertyChange(PropertyChangeEvent e) {
String prop = e.getPropertyName();
if (isVisible() && (e.getSource() == optionPane)) {
// the VALUE_PROPERTY is not the same as the INPUT_VALUE_PROPERTY. we make use of the INPUT_VALUE_PROPERTY to carry our data
// but the JOptionPane uses the VALUE_PROPERTY for other stuff
if (JOptionPane.VALUE_PROPERTY.equals(prop)) {
// newValues delivered by VALUE_PROPERTY PropertyChangeEvent can be the actual labels of the button clicked,
// that's sooo counter-intuitive to me, but it's how we know which button got clicked
if (button1Str.equals(e.getNewValue())) {
// "OK" functionality...
// ...this will fire the event that takes the user input to the validation code
optionPane.setInputValue(textField.getText());
} else if (button2Str.equals(e.getNewValue())) {
// "CANCEL" functionality
optionPane.setInputValue(null);
exit();
}
} else if (JOptionPane.INPUT_VALUE_PROPERTY.equals(prop)) {
Object value = optionPane.getInputValue();
// null or empty strings in the text field (ie in the INPUT_VALUE_PROPERTY) are ignored
if (null != value && ((String) value).length() > 0) {
// here is the validation code
if (Files.exists(rootPath.resolve(textField.getText()))) {
// already exists, tell user
JOptionPane.showMessageDialog(this,
"Sorry, " + rootPath.resolve(textField.getText()).toString() + " already exists.\n\n Please enter another name.",
"OK",
JOptionPane.ERROR_MESSAGE);
// Make sure PropertyChangeEvent will fire next time...
// ...PropertyChangeEvents don't fire in setInputValue(newVal)...
// ...if newVal is equal to the current value, but if the user clicks...
// ...button 1 or hits enter in the text field without changing his text,...
// ...we still want to fire another event...
// ...so we reset the property without changing the text in the textField
optionPane.setInputValue(null);
} else {
// does not exist.. we are keeping the users input...
// ... it gets delivered to the user in getInputValue()
exit();
}
}
}
}
}
/**
* returns the users's validated input. Validated means !Files.exists(rootPath.resolve(input)).
*
* @return the text entered by the user, UNINITIALIZED_VALUE if the user X closed, null the user canceled
*/
public Object getInputValue() {
return optionPane.getInputValue();
}
/**
* closes the dialog and triggers the return from setVisible()
*/
public void exit() {
dispose();
}
}
调用它的代码是:
GetPathNameDialog tempD = new GetPathNameDialog(
someFolderPath,
"theFileNameThatMustBeChanged.txt",
"Change File Name",
50,
"someFolderPath already contains a file named theFileNameThatMustBeChanged.txt." + ".\n\nPlease enter a different file name:",
"Copy the file with the new name", "Do not copy the file");
tempD.setVisible(true);
Object inputObj = tempD.getInputValue();
String input = (inputObj == JOptionPane.UNINITIALIZED_VALUE || null == inputObj ? "" : (String) inputObj);
if (input.length() > 0) {
// we now have a new file name. go ahead and do the copy or rename or whatever...
}
你用什么方法?showConfirmDialog,showInputDialog?我正在使用JDialog的createDialog或setContentPane,但如果它能工作,我可以使用任何东西是的,这就是我要找的。谢谢!完美的我唯一建议更改的是:使用
optionPane.addPropertyChangeListener(“value”,this)代码>以提高性能。因为我使用了它,所以为此+1。。。谢谢你,大卫。我把我的贴在下面,因为它有点不同,可能是useful@PMorganCA很高兴能为您提供帮助,正如我所说的,我不确定简单地复制和粘贴代码对我是否有效?我是否可以使用自己的JFrame
和JPanel
来创建JOptionPane
,而不是添加字符串数组。例如,我可以将我自己的JFrame和JPanel传递给JOptionPane.showMessageDialog()。如果验证失败,我无法让它进行验证并保持打开状态。嗯,我不确定你的意思,我只是再次测试了代码,工作正常…@DavidKroukamp您的代码工作正常,很抱歉造成混淆。我无法开始工作的是我最初的尝试,其中包括从Java教程中的部分示例代码中进行剪切和粘贴。