[英]How dynamically changing the event handler from numbers only to letters in textfield?
I have a ComboBox
and a Textfield
, I need that when I select 'letters' in the ComboBox
the Textfield
accepts only letters and when I select 'numbers' in the ComboBox
the Textfield
accepts only numbers我有一个
ComboBox
和一个Textfield
,当我在ComboBox
选择“字母”时, Textfield
只接受字母,当我在ComboBox
选择“数字”时, Textfield
只接受数字
JDK jdk1.8.0_201: JDK jdk1.8.0_201:
.
.
.
oneComboBox.getSelectionModel().selectedItemProperty().addListener(new ChangeListener<String>() {
@Override
public void changed(ObservableValue<? extends String> ov, String preview, String last) {
if(last.equals("Letter")) {
codeTextField.textProperty().addListener(new ChangeListener<String>() {
@Override
public void changed(ObservableValue<? extends String> observable, String oldValue, String newValue) {
if (!newValue.matches("-?([0-9]*)?")) {
codeTextField.setText(oldValue);
}
}
});
}else if(last.equals("Number")) {
codeTextField.textProperty().addListener(new ChangeListener<String>() {
@Override
public void changed(ObservableValue<? extends String> observable, String oldValue, String newValue) {
if (!newValue.matches("\\sa-zA-Z*")) {
codeTextField.setText(newValue.replaceAll("[^\\sa-zA-Z]", ""));
}
}
});
}
}
});
.
.
.
You should create two TextFormatters
and set them based on the ComboBox
selection.您应该创建两个
TextFormatters
并根据ComboBox
选择设置它们。 MCVE: MCVE:
import java.util.function.UnaryOperator;
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.control.ComboBox;
import javafx.scene.control.TextField;
import javafx.scene.control.TextFormatter;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
/**
*
* @author blj0011
*/
public class JavaFXApplication362 extends Application
{
@Override
public void start(Stage primaryStage)
{
ObservableList<String> options = FXCollections.observableArrayList(
"A",
"2",
"3",
"b"
);
TextField textField = new TextField();
ComboBox<String> comboBox = new ComboBox<>(options);
UnaryOperator<TextFormatter.Change> numbersOnly = (TextFormatter.Change change) -> {
System.out.println(change);
String text = change.getText();
for (int i = 0; i < text.length(); i++) {
if (!Character.isDigit(text.charAt(i))) {
return null;
}
}
return change;
};
UnaryOperator<TextFormatter.Change> characterOnly = (TextFormatter.Change change) -> {
System.out.println(change);
String text = change.getText();
for (int i = 0; i < text.length(); i++) {
if (Character.isDigit(text.charAt(i))) {
return null;
}
}
return change;
};
comboBox.valueProperty().addListener((observable, oldValue, newValue) -> {
if (Character.isDigit(newValue.charAt(0))) {
textField.clear();
textField.setTextFormatter(new TextFormatter(numbersOnly));
}
else {
textField.clear();
textField.setTextFormatter(new TextFormatter(characterOnly));
}
});
VBox root = new VBox();
root.getChildren().addAll(comboBox, textField);
Scene scene = new Scene(root, 300, 250);
primaryStage.setTitle("Hello World!");
primaryStage.setScene(scene);
primaryStage.show();
}
/**
* @param args the command line arguments
*/
public static void main(String[] args)
{
launch(args);
}
}
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