TextArea

TextArea in JavaFX. I’ll explain it, give examples in Java and FXML, and show how to use it effectively.

1️⃣ What is TextArea?

• TextArea is a multi-line text input control.
• Users can type, edit, copy, paste, and scroll through text.
• Useful for logs, messages, notes, or code editors.

2️⃣ Key Features

1. Multi-line support – unlike TextField.
2. Text wrapping – can wrap text automatically.
3. Editable property – can make it read-only.
4. Scrollbars – appear automatically if text exceeds the visible area.
5. Get/Set text – use getText() and setText().

3️⃣ Simple Java Example

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.TextArea;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class TextAreaExample extends Application {

    @Override
    public void start(Stage primaryStage) {
        TextArea textArea = new TextArea();
        textArea.setPromptText("Type something here...");
        textArea.setPrefRowCount(10);  // height in rows
        textArea.setPrefColumnCount(30);  // width in characters
        textArea.setWrapText(true);    // wrap long lines

        // Set default text
        textArea.setText("Hello! This is a TextArea example.\nYou can write multiple lines here.");

        VBox root = new VBox(textArea);
        root.setSpacing(10);
        root.setStyle("-fx-padding: 20;");

        Scene scene = new Scene(root, 400, 300);
        primaryStage.setScene(scene);
        primaryStage.setTitle("TextArea Example");
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}

✅ Explanation:

• setWrapText(true) ensures long lines don’t scroll horizontally.
• setPrefRowCount and setPrefColumnCount control size.
• You can get the current text with textArea.getText().

4️⃣ FXML Example

<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.TextArea?>
<?import javafx.scene.layout.VBox?>

<VBox xmlns="http://javafx.com/javafx/17.0.2" xmlns:fx="http://javafx.com/fxml"
      fx:controller="com.example.TextAreaController"
      spacing="10" style="-fx-padding: 20;">

    <TextArea fx:id="textArea" promptText="Type something..." wrapText="true" prefRowCount="10" prefColumnCount="30"/>
    
</VBox>

Controller

package com.example;

import javafx.fxml.FXML;
import javafx.scene.control.TextArea;

public class TextAreaController {

    @FXML
    private TextArea textArea;

    @FXML
    public void initialize() {
        textArea.setText("Hello! You can write multiple lines here.\nThis is controlled from the controller.");
    }

    // Example method to get text
    public String getTextContent() {
        return textArea.getText();
    }
}

5️⃣ Notes

• Read-only: textArea.setEditable(false);
• Appending text: textArea.appendText("\nNew line added!");
• Scrolling: Scrolls automatically when text exceeds area.
• Can be combined with buttons to save, clear, or process text.