How To Register Key Presses Javafx

JavaFX | TextField

TextField class is a part of JavaFX package. It is a component that allows the user to enter a line of unformatted text, it does not allow multi-line input it only allows the user to enter a single line of text. The text tin and so be used as per requirement.

Constructor of the TextField class :

TextField(): creates a new TextField with empty text content
TextField(String due south): creates a new TextField with a initial text .

Commonly used methods:

method	explanation
setPrefColumnCount(int five)	Sets the value of the belongings prefColumnCount.
setOnAction(EventHandler value)	Sets the value of the belongings onAction.
setAlignment(Pos 5)	Sets the value of the property alignment.
prefColumnCountProperty()	The preferred number of text columns
onActionProperty()	The action handler associated with this text field, or naught if no action handler is assigned.
getPrefColumnCount()	Gets the value of the property prefColumnCount.
getOnAction()	Gets the value of the property onAction.
getAlignment()	Gets the value of the holding alignment.
getCharacters()	Returns the grapheme sequence backing the text field's content.

Below programs illustrate the use of text field:

Coffee program to create a TextField and add information technology to stage: This program creates a TextField indicated by the proper name b. The TextField volition be created inside a scene, which in turn will exist hosted within a stage (which is the top level JavaFX container). The function setTitle() is used to provide title to the phase. So a Title-pane is created, on which addChildren() method is called to attach the TextField within the scene, forth with the resolution specified by (200, 200) in the code. Finally the show() method is chosen to display the final results.

import javafx.application.Application;

import javafx.scene.Scene;

import javafx.scene.command.*;

import javafx.scene.layout.StackPane;

import javafx.stage.Stage;

public class Textfield extends Application {

public void start(Stage s)

{

south.setTitle( "creating TextField" );

TextField b = new TextField();

StackPane r = new StackPane();

r.getChildren().add together(b);

Scene sc = new Scene(r, 200 , 200 );

s.setScene(sc);

southward.show();

}

public static void primary(String args[])

{

launch(args);

}

}

Output:
Java program to create a TextField with an initial text and add an consequence handler: This program creates a TextField indicated by the name b. We will create a label which will display the Text when the enter key is pressed.we will create an event handler that will handle the outcome of the Text field and the event handler would exist added to the Textfield using setOnAction() method. The TextField volition be created inside a scene, which in turn volition be hosted inside a stage (which is the acme level JavaFX container). The office setTitle() is used to provide title to the stage. And so a Title-pane is created, on which addChildren() method is called to attach the TextField and a label inside the scene, forth with the resolution specified past (200, 200) in the code. Finally, the show() method is called to display the final results.

import javafx.application.Application;

import javafx.scene.Scene;

import javafx.scene.control.*;

import javafx.scene.layout.*;

import javafx.outcome.ActionEvent;

import javafx.event.EventHandler;

import javafx.scene.control.Label;

import javafx.stage.Phase;

public class Textfield_1 extends Application {

public void start(Stage due south)

{

s.setTitle( "creating textfield" );

TextField b = new TextField( "initial text" );

TilePane r = new TilePane();

Label fifty = new Label( "no text" );

EventHandler<ActionEvent> event = new EventHandler<ActionEvent>() {

public void handle(ActionEvent east)

{

l.setText(b.getText());

}

};

b.setOnAction(issue);

r.getChildren().add(b);

r.getChildren().add together(fifty);

Scene sc = new Scene(r, 200 , 200 );

s.setScene(sc);

south.evidence();

}

public static void main(String args[])

{

launch(args);

}

}

Output:
Java program to create a textfield with an initial text and add together an effect handler: This programme creates a TextField indicated by the proper noun b. We volition set an initial text by invoking its constructor with a cord and besides set the preferred column count using setPrefColumnCount() method. Nosotros will create a label which volition display the Text when the enter key is pressed. We will create an event handler that will handle the event of the Text field and the event handler would be added to the Textfield using setOnAction() method. The TextField will be created inside a scene, which in turn will be hosted inside a stage (which is the top level JavaFX container). The part setTitle() is used to provide title to the stage. And so a Title-pane is created, on which addChildren() method is chosen to attach the TextField and a label inside the scene, along with the resolution specified by (200, 200) in the code. Finally, the show() method is called to brandish the terminal results.

import javafx.application.Awarding;

import javafx.scene.Scene;

import javafx.scene.control.*;

import javafx.scene.layout.*;

import javafx.event.ActionEvent;

import javafx.event.EventHandler;

import javafx.scene.control.Label;

import javafx.phase.Stage;

public class TextField_2 extends Application {

public void start(Stage due south)

{

due south.setTitle( "creating textfield" );

TextField b = new TextField( "initial text" );

b.setPrefColumnCount( 7 );

TilePane r = new TilePane();

Characterization l = new Label( "no text" );

EventHandler<ActionEvent> event = new EventHandler<ActionEvent>() {

public void handle(ActionEvent e)

{

l.setText(b.getText());

}

};

b.setOnAction(event);

r.getChildren().add(b);

r.getChildren().add(fifty);

Scene sc = new Scene(r, 200 , 200 );

s.setScene(sc);

s.testify();

}

public static void main(String args[])

{

launch(args);

}

}

Output:
Java program to create a TextField with an initial text and center alignment of text and add together an outcome handler: This program creates a TextField indicated by the proper name b.we will ready an initial text by invoking its constructor with a string and besides set up the alignment using setAlignment() method.we volition create a label which will display the Text when the enter key is pressed.we volition create an event handler that will handle the upshot of the Text field and the event handler would be added to the Textfield using setOnAction() method. The TextField will exist created within a scene, which in plow will exist hosted inside a stage (which is the top level JavaFX container). The function setTitle() is used to provide title to the stage. Then a Championship-pane is created, on which addChildren() method is chosen to attach the TextField and a label within the scene, forth with the resolution specified past (200, 200) in the lawmaking. Finally, the show() method is called to display the final results.

import javafx.application.Application;

import javafx.scene.Scene;

import javafx.scene.control.*;

import javafx.scene.layout.*;

import javafx.event.ActionEvent;

import javafx.event.EventHandler;

import javafx.scene.control.Label;

import javafx.phase.Stage;

import javafx.geometry.*;

public class TextField_4 extends Application {

public void start(Phase due south)

{

s.setTitle( "creating textfield" );

TextField b = new TextField( "initial text" );

b.setAlignment(Pos.Center);

TilePane r = new TilePane();

Label 50 = new Label( "no text" );

EventHandler<ActionEvent> issue = new EventHandler<ActionEvent>() {

public void handle(ActionEvent e)

{

50.setText(b.getText());

}

};

b.setOnAction(event);

r.getChildren().add(b);

r.getChildren().add(l);

Scene sc = new Scene(r, 200 , 200 );

southward.setScene(sc);

southward.show();

}

public static void principal(String args[])

{

launch(args);

}

}

Output: