How to disable Button when TextField is empty?

Question

In the following code I have a TextField and a Button. I need to disable the Button when ever the TextField is empty, so that I can avoid entering empty values to the databa

Answer 1

use textProperty() Listener for TextField

try this...

Button b1 = new Button("DELETE");
b1.setFont(Font.font("Calibri", FontWeight.BOLD, 17));
b1.setPrefSize(100, 30);
b1.setStyle(" -fx-base: #ffffff;");
b1.setTextFill(Color.BLACK);

b1.setDisable(true); // Initally text box was empty so button was disable

txt1.textProperty().addListener(new ChangeListener() {

        @Override
        public void changed(ObservableValue ov, String t, String t1) {
            //System.out.println(t+"====="+t1);
           if(t1.equals(""))
               b1.setDisable(true);
           else
               b1.setDisable(false);
        }
    });