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<TITLE>Listening for Editing Changes in a JTextComponent
(Java Developers Almanac Example)
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<h3>
e1015.
Listening for Editing Changes in a JTextComponent</h3>
A <code>DocumentEvent</code> is fired each time characters are inserted or
removed from a text component. The event is also fired if the set of
attributes in the text component is changed.
<pre>
JTextComponent textcomp = new JTextPane();
textcomp.setText(<font color="#0066ff"><i>"Initial Text"</i></font>);
textcomp.getDocument().addDocumentListener(new DocumentListener() {
// This method is called after an insert into the document
public void insertUpdate(DocumentEvent evt) {
// Get index of newly inserted characters
int off = evt.getOffset();
// Get length of new inserted characters
int len = evt.getLength();
try {
// Get inserted string
String str = evt.getDocument().getText(off, len);
} catch (BadLocationException e) {
}
}
// This method is called after a removal from the document
public void removeUpdate(DocumentEvent evt) {
// Get starting index of removed characters
int off = evt.getOffset();
// Get length of removed characters
int len = evt.getLength();
// The removed characters are not available
}
// This method is called after one or more attributes have changed.
// This method is not called when characters are inserted with attributes.
public void changedUpdate(DocumentEvent evt) {
// Get starting index of characters whose attributes have changed
int off = evt.getOffset();
// Get length of characters whose attributes have changed
int len = evt.getLength();
}
});
</pre>
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Related Examples
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e1014. <a class="eglink" href="ListenCaretEvent.html?l=rel">
Listening for Caret Movement Events in a JTextComponent
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See also:
<a class="eglink" href="/egs/javax.swing.text/pkg.html?l=rel#Actions%20and%20Key%20Bindings">
Actions and Key Bindings
</a>
<a class="eglink" href="/egs/javax.swing.text/pkg.html?l=rel#Caret%20and%20Selection">
Caret and Selection
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<a class="eglink" href="/egs/javax.swing.text/pkg.html?l=rel#JEditorPane">
JEditorPane
</a>
<a class="eglink" href="/egs/javax.swing.text/pkg.html?l=rel#JFormattedTextField">
JFormattedTextField
</a>
<a class="eglink" href="/egs/javax.swing.text/pkg.html?l=rel#JTextArea">
JTextArea
</a>
<a class="eglink" href="/egs/javax.swing.text/pkg.html?l=rel#JTextComponent">
JTextComponent
</a>
<a class="eglink" href="/egs/javax.swing.text/pkg.html?l=rel#JTextField">
JTextField
</a>
<a class="eglink" href="/egs/javax.swing.text/pkg.html?l=rel#JTextPane">
JTextPane
</a>
<a class="eglink" href="/egs/javax.swing.text/pkg.html?l=rel#Styles">
Styles
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