how to make realtime message or character counter in java

Question

In messages apps, as you type a counter label on the corner gets updated showing the number of characters being entered. How do I create the same thing in Java?

Use a [listener](http://stackoverflow.com/questions/30160899/value-change-listener-for-javafxs-textfield) — BackSlash, Apr 01 '17 at 19:21
I tried adding listener, it worked but it is passing whatever I type in the textfield to the counter label. What I need is to show the number of characters on realtime just like the one which is under this comment box: it is updating the numbers that show "n characters left". — Ahmadali, Apr 01 '17 at 19:37
inputText.textProperty().addListener(((observable, oldValue, newValue) -> { int c = (int) newValue.length(); String s = String.valueOf(c); inputWordCounter.setText(s); })); — Ahmadali, Apr 01 '17 at 20:31

score 1 · Accepted Answer · answered Apr 02 '17 at 08:16

Retrieve a IntegerBinding from the TextField's text property containing it's length and convert this to a StringBinding in a way that suits your needs. Bind the text property of the output Label to the result:

@Override
public void start(Stage primaryStage) {
    TextField textField = new TextField();
    Label label = new Label();
    label.textProperty().bind(textField.textProperty()
                                       .length()
                                       .asString("Character Count: %d"));
    VBox root = new VBox(label, textField);

    Scene scene = new Scene(root);

    primaryStage.setScene(scene);
    primaryStage.show();
}

how to make realtime message or character counter in java

1 Answers1