Problem in Google Visualization Chart Api - html

Question

I am using GWT
If You look at my code , When I click on Hide button it clear the pieFlowPanel Panel but when I click on Show button it does not show my PieChart
final Panel panel = RootPanel.get();
final FlowPanel pieFlowPanel = new FlowPanel();
final Runnable onLoadCallback = new Runnable() {
public void run() {
PieChart pie;
// Create a pie chart visualization.
pie = new PieChart(createTable(), createOptions());
pie.addOnMouseOverHandler(createSelectHandler(pie));
// pie.addSelectHandler(createSelectHandler(pie));
pieFlowPanel.add(pie);
panel.add(pieFlowPanel);
}
};
VisualizationUtils.loadVisualizationApi(onLoadCallback, PieChart.PACKAGE);
Button button = new Button("Hide");
Button button2 = new Button("Show");
button.addClickHandler(new ClickHandler() {
#Override
public void onClick(ClickEvent event) {
pieFlowPanel.clear();
}
});
button2.addClickHandler(new ClickHandler() {
#Override
public void onClick(ClickEvent event) {
final Runnable onLoadCallback1 = new Runnable() {
public void run() {
Window.alert("RUN");
PieChart pie;
pie = new PieChart(createTable(), createOptions());
pie.addOnMouseOverHandler(createSelectHandler(pie));
pieFlowPanel.add(pie);
panel.add(pieFlowPanel);
}
};
VisualizationUtils.loadVisualizationApi(onLoadCallback1, PieChart.PACKAGE);
}
});
panel.add(button);
panel.add(button2);
Please suggest me solution ...
Thanks

Answer 1

I had this problem earlier. All my applications that use a customized component based on Visualization API suddenly stop working, even older versions and local deployments.
Then I replace this line:
VisualizationUtils.loadVisualizationApi(onLoadCallback, Blabla.PACKAGE);
with:
VisualizationUtils.loadVisualizationApi(onLoadCallback);
and it works. Still have no idea on what has happened though.