How to clear text added in a javafx barchart?

Question

I add some text at the top of bars (the value of each bar). It\'s working but the problem is I want to remove this text each time I update the chart. In fact, text stays aft

Answer 1

Thanks to Roland I was able to create the following chart with fixed alignments. This might be helpful for someone due the lack of proposed solutions for this problem.

public class CustomBarChart extends BarChart {

    Map nodeMap = new HashMap<>();

    public CustomBarChart(Axis xAxis, Axis yAxis) {
        super(xAxis, yAxis);
        this.setBarGap(0.0);
    }

    @Override
    protected void seriesAdded(Series series, int seriesIndex) {

        super.seriesAdded(series, seriesIndex);

        for (int j = 0; j < series.getData().size(); j++) {

            Data item = series.getData().get(j);

            Text text = new Text(item.getYValue().toString());
            text.setStyle("-fx-font-size: 10pt;");

            TextFlow textFlow = new TextFlow(text);
            textFlow.setTextAlignment(TextAlignment.CENTER);

            nodeMap.put(item.getNode(), textFlow);
            this.getPlotChildren().add(textFlow);

        }

    }

    @Override
    protected void seriesRemoved(final Series series) {

        for (Node bar : nodeMap.keySet()) {

            Node text = nodeMap.get(bar);
            this.getPlotChildren().remove(text);

        }

        nodeMap.clear();

        super.seriesRemoved(series);
    }

    @Override
    protected void layoutPlotChildren() {

        super.layoutPlotChildren();

        for (Node bar : nodeMap.keySet()) {

            TextFlow textFlow = nodeMap.get(bar);

            if (bar.getBoundsInParent().getHeight() > 30) {
                ((Text) textFlow.getChildren().get(0)).setFill(Color.WHITE);
                textFlow.resize(bar.getBoundsInParent().getWidth(), 200);
                textFlow.relocate(bar.getBoundsInParent().getMinX(), bar.getBoundsInParent().getMinY() + 10);
            } else {
                ((Text) textFlow.getChildren().get(0)).setFill(Color.GRAY);
                textFlow.resize(bar.getBoundsInParent().getWidth(), 200);
                textFlow.relocate(bar.getBoundsInParent().getMinX(), bar.getBoundsInParent().getMinY() - 20);
            }
        }
    }
}