JavaFX 8 count rows in “textarea”

Question

We are trying to count the number of rows in a TextArea
Here are the TextArea properties PrefWidth 600 and PrefHeight 620 with MaxHeight 620
Wrap Text is set to true. We

Answer 1

A Minimal, Reproducible Example is something that can be copied and run without much changes, should also have self explanatory variables.

For your reference, I am providing a demo and can you please update it as per your requirment. It is very hard to follow your code as the variables are not explanatory.

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.TextArea;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.Priority;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class TextAreaLinesCount_Demo extends Application {
    @Override
    public void start(Stage stage) throws Exception {
        final VBox root = new VBox();
        root.setSpacing(10);
        root.setPadding(new Insets(10));
        final Scene sc = new Scene(root, 350, 200);
        stage.setScene(sc);
        stage.show();

        Label lines = new Label();
        Label alert = new Label();
        GridPane gp = new GridPane();
        gp.setHgap(10);
        gp.setVgap(10);
        gp.addRow(0, new Label("No of Lines:"), lines);
        gp.addRow(1, new Label("Alert:"), alert);

        TextArea textArea = new TextArea();
        textArea.setWrapText(true);
        textArea.textProperty().addListener((obs, old, text) -> {
            lines.setText(text.split("\n").length + "");
            validate(text, alert);
        });
        VBox.setVgrow(textArea, Priority.ALWAYS);
        root.getChildren().addAll(gp, textArea);

        textArea.setText("Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.");
    }

    private void validate(String text, Label alert) {
        // Can you add your logic here.. and update the "alert" label for when to show the alert
    }
}