问个jcombobox的问题

请问如何去掉jcombobox的下拉按钮？或者没有没其它办法实现在输入框输入时实现自动完成功能？

这个可以实现
我写了一个代码在公司
明天给弄上来

太好了，谢谢。一贴不能多问，解决了这个问题的话还要开新贴问另外一个问题。

没有下拉的不是textfield么，什么意思？

jcombobox我可以实现自动完成，但我不想显示那个下拉按钮，如果textfield可以实现自动完成的话那就最好不过了。请问如何实现？谢谢

import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.*;
import java.util.Vector;
import java.util.ArrayList;
import java.util.List;

public class Combo
extends PlainDocument {
JComboBox comboBox;
static JComboBox recombo;
ComboBoxModel model;
JTextComponent editor;
// flag to indicate if setSelectedItem has been called
// subsequent calls to remove/insertString should be ignored
boolean selecting = false;
public Combo(final JComboBox comboBox) {
this.comboBox = comboBox;
model = comboBox.getModel();
editor = (JTextComponent) comboBox.getEditor().getEditorComponent();
editor.setDocument(this);
comboBox.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (!selecting) highlightCompletedText(0);
}
});
editor.addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent e) {
if (comboBox.isDisplayable()) comboBox.setPopupVisible(true);
}
});
// Handle initially selected object
Object selected = comboBox.getSelectedItem();
if (selected != null) setText(selected.toString());
highlightCompletedText(0);
}

public void remove(int offs, int len) throws BadLocationException {
// return immediately when selecting an item
if (selecting)return;
super.remove(offs, len);
}

public void insertString(int offs, String str, AttributeSet a) throws
BadLocationException {
// return immediately when selecting an item
if (selecting)return;
// insert the string into the document
super.insertString(offs, str, a);
// lookup and select a matching item
Object item = lookupItem(getText(0, getLength()));
if (item != null) {
setSelectedItem(item);
}
else {
// keep old item selected if there is no match
item = comboBox.getSelectedItem();
// imitate no insert (later on offs will be incremented by str.length(): selection won't move forward)
offs = offs - str.length();
// provide feedback to the user that his input has been received but can not be accepted
comboBox.getToolkit().beep(); // when available use: UIManager.getLookAndFeel().provideErrorFeedback(comboBox);
}
setText(item.toString());
// select the completed part
highlightCompletedText(offs + str.length());
}

private void setText(String text) {
try {
// remove all text and insert the completed string
super.remove(0, getLength());
super.insertString(0, text, null);
}
catch (BadLocationException e) {
throw new RuntimeException(e.toString());
}
}

private void highlightCompletedText(int start) {
editor.setCaretPosition(getLength());
editor.moveCaretPosition(start);
}

private void setSelectedItem(Object item) {
selecting = true;
model.setSelectedItem(item);
selecting = false;
}

private Object lookupItem(String pattern) {
Object selectedItem = model.getSelectedItem();
// only search for a different item if the currently selected does not match
if (selectedItem != null &&
startsWithIgnoreCase(selectedItem.toString(), pattern)) {
return selectedItem;
}
else {
// iterate over all items
for (int i = 0, n = model.getSize(); i < n; i++) {
Object currentItem = model.getElementAt(i);
// current item starts with the pattern?
if (startsWithIgnoreCase(currentItem.toString(), pattern)) {
return currentItem;
}
}
}
// no item starts with the pattern => return null
return null;
}

// checks if str1 starts with str2 - ignores case
private boolean startsWithIgnoreCase(String str1, String str2) {
return str1.toUpperCase().startsWith(str2.toUpperCase());
}

private static JComboBox createAndShowGUI(JComboBox combo) {
// the combo box (add/modify items if you like to)
// JComboBox comboBox1 = new JComboBox(new Object[] {"Ester", "大连", "大庆", "大大",
// "ab", "abc", "abcd", "asdfsdf", "dgdfg",
// "uhkg", "e56trstfg", "xcvxvb", "Jordi",
// "Jordina", "Jorge", "Sergi"});
// has to be editable
List list = new ArrayList();
for (int i = 0; i < combo.getItemCount(); i++) {

list.add(combo.getItemAt(i));
}

for (int i = 0; i < list.size(); i++) {
for (int j = 0; j < list.size() - i - 1; j++)
if ( ( ( (String) list.get(j)).compareToIgnoreCase( (String) list.get(j +
1))) > 0) {
String a = (String) list.get(j);
String b = (String) list.get(j + 1);
String c;
c = a;
a = b;
b = c;
list.set(j, a);
list.set(j + 1, b);
}
}
Object[] array = list.toArray();
JComboBox comboBox = new JComboBox(array);

comboBox.setEditable(true);
// change the editor's document
new Combo(comboBox);
return comboBox;
// create and show a window containing the combo box
// JFrame frame = new JFrame();
// frame.setDefaultCloseOperation(3);
// frame.getContentPane().add(comboBox);
// frame.pack(); frame.setVisible(true);
}


//ComboBox调用
public static JComboBox creatCombo(final JComboBox combo) {

// javax.swing.SwingUtilities.invokeLater(new Runnable() {
// public void run() {
recombo = new JComboBox();
recombo = createAndShowGUI(combo);
// }
// });

return recombo;


}
}

调用这个里面的creatCombo方法
例如:
JComboBox abcCombo=new JComboBox();
abcCombo=creatCombo(abcCombo);

这样abcCombo就ok了

我估计这个方法对textfield可能也好用
LZ看看改改什么地方应该就可以吧

楼上的程序可读性太差，而且不是完整的应用程序呀

看不明白..............，请高手指点一下。谢谢

"jcombobox我可以实现自动完成" 自动完成什么功能?

就是在jcombobox中输入文字时自动查找匹配的项目。

看来仿佛性能和内存使用上有很多可以改进的地方啊……

欧,用textfield就可以了,在textfield插入键盘事件,输入文字的时候查找,如果有匹配的就显示在JList里面,JList的高度\宽度\位置自己控制就行了

楼主一定是没用我写的那个,完全可以实现自动匹配,看不懂你就先用,HOHO
好用了在看

import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.*;

public class S11InitialSelection extends PlainDocument {
JComboBox comboBox;
ComboBoxModel model;
JTextComponent editor;
// flag to indicate if setSelectedItem has been called
// subsequent calls to remove/insertString should be ignored
boolean selecting=false;
public S11InitialSelection(final JComboBox comboBox) {
this.comboBox = comboBox;
model = comboBox.getModel();
editor = (JTextComponent) comboBox.getEditor().getEditorComponent();
editor.setDocument(this);
comboBox.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (!selecting) highlightCompletedText(0);
}
});
editor.addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent e) {
if (comboBox.isDisplayable()) comboBox.setPopupVisible(true);
}
});
// Handle initially selected object
Object selected = comboBox.getSelectedItem();
if (selected!=null) setText(selected.toString());
highlightCompletedText(0);
}
public void remove(int offs, int len) throws BadLocationException {
// return immediately when selecting an item
if (selecting) return;
super.remove(offs, len);
}
public void insertString(int offs, String str, AttributeSet a) throws BadLocationException {
// return immediately when selecting an item
if (selecting) return;
// insert the string into the document
super.insertString(offs, str, a);
// lookup and select a matching item
Object item = lookupItem(getText(0, getLength()));
if (item != null) {
setSelectedItem(item);
} else {
// keep old item selected if there is no match
item = comboBox.getSelectedItem();
// imitate no insert (later on offs will be incremented by str.length(): selection won't move forward)
offs = offs-str.length();
// provide feedback to the user that his input has been received but can not be accepted
comboBox.getToolkit().beep(); // when available use: UIManager.getLookAndFeel().provideErrorFeedback(comboBox);
}
setText(item.toString());
// select the completed part
highlightCompletedText(offs+str.length());
}
private void setText(String text) {
try {
// remove all text and insert the completed string
super.remove(0, getLength());
super.insertString(0, text, null);
} catch (BadLocationException e) {
throw new RuntimeException(e.toString());
}
}
private void highlightCompletedText(int start) {
editor.setCaretPosition(getLength());
editor.moveCaretPosition(start);
}
private void setSelectedItem(Object item) {
selecting = true;
model.setSelectedItem(item);
selecting = false;
}
private Object lookupItem(String pattern) {
Object selectedItem = model.getSelectedItem();
// only search for a different item if the currently selected does not match
if (selectedItem != null && startsWithIgnoreCase(selectedItem.toString(), pattern)) {
return selectedItem;
} else {
// iterate over all items
for (int i=0, n=model.getSize(); i < n; i++) {
Object currentItem = model.getElementAt(i);
// current item starts with the pattern?
if (startsWithIgnoreCase(currentItem.toString(), pattern)) {
return currentItem;
}
}
}
// no item starts with the pattern => return null
return null;
}
// checks if str1 starts with str2 - ignores case
private boolean startsWithIgnoreCase(String str1, String str2) {
return str1.toUpperCase().startsWith(str2.toUpperCase());
}
private static void createAndShowGUI() {
// the combo box (add/modify items if you like to)
JComboBox comboBox = new JComboBox(new Object[] {"Ester", "Jordi", "Jordina", "Jorge", "Sergi"});
// has to be editable
comboBox.setEditable(true);
// change the editor's document
new S11InitialSelection(comboBox);
// create and show a window containing the combo box
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(3);
frame.getContentPane().add(comboBox);
frame.pack(); frame.setVisible(true);
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}


这个可以直接跑
HOHO