How get an event when text in a TextField changes? JavaFX

Question

How can I generate a new event to handle whenever TextField's text is changed?

score 27 · Accepted Answer · answered Jul 12 '15 at 17:27

27

Or Use ChangeListener interface.

textField.textProperty().addListener(new ChangeListener<String>() {
    @Override
    public void changed(ObservableValue<? extends String> observable,
            String oldValue, String newValue) {

        System.out.println(" Text Changed to  " + newValue + ")\n");
    }
});

answered Jul 12 '15 at 17:27

Fevly Pallar

3,059
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19

This is useful! But any idea how I can register the change say when I hit the 'Enter' key? – alchemist.gamma Oct 17 '17 at 02:02
Well then put this listener inside the listener for the *Enter*, inside the *Enter* listener's callback to be precise. – Fevly Pallar Oct 18 '17 at 05:28
4

If you want to catch the Enter key, I believe you want `setOnAction`; my understanding is that by default, pressing Enter in a text field "submits" the form by invoking the registered action, if any. – Tim has moved to Codidact Aug 18 '19 at 23:12

James_D · Answer 2 · 2015-07-12T17:32:34.267

20

Register a listener with the TextFields textProperty:

textField.textProperty().addListener((obs, oldText, newText) -> {
    System.out.println("Text changed from "+oldText+" to "+newText);
    // ...
});

edited Jul 12 '15 at 17:32

answered Jul 12 '15 at 17:24

James_D

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16
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score 2 · Answer 3 · answered Apr 04 '19 at 18:34

my solution:

....
String temp;
....
//previously in some method when starting to take initial value of the textfield and save it in a temporal
temp=id_textfield.getText();
....
//when losing focus we check if the new value is different

id_textfield.focusedProperty().addListener(new ChangeListener<Boolean>() {
        @Override
        public void changed(ObservableValue<? extends Boolean> observable, Boolean oldValue, Boolean newValue) {

            //focus in
            if (newValue) {
                temp = id_textfield.getText();
            }

            //focus out
            if (oldValue) {

                if (!(temp.equals(id_textfield.getText()))) {
                    System.out.println("New String")
                }
            }

        }
    });

this code work fine. I don't understand the negative – agriarte Apr 04 '19 at 21:57 — agriarte, Apr 04 '19 at 21:57

How get an event when text in a TextField changes? JavaFX

3 Answers3