How to prevent DoubleSubmit in a GWT application? - gwt

Question

To clarify what double submit is: When the user clicks on a submit button twice, the server will process the same POST data twice. To avoid this (apart from disabling the button after a single submit), most web frameworks like Struts provide a token mechanism. I am searching for the equivalent of this in GWT.

Answer 1

If you want to avoid submitting twice, how about:
boolean processing = false;
button.addClickHandler(new ClickHandler() {
#Override
public void onClick(ClickEvent event) {
if (!processing) {
processing = true;
button.setEnabled(false);
// makes an RPC call, does something you only want to do once.
processRequest(new AsyncCallback<String>() {
#Override
public void onSuccess(String result) {
// do stuff
processing = false;
button.setEnabled(true);
});
});
}
}
});
That's the gist of it.

Answer 2

This will be helpfull for you -
final Button btn = new Button("Open");
btn.addSelectionListener(new SelectionListener<ButtonEvent>() {
#Override
public void componentSelected(ButtonEvent ce) {
btn.setEnabled(false);
openMethod(name, new AsyncCallback<Void>() {
public void onFailure(Throwable caught) {
btn.setEnabled(true);
}
public void onSuccess(Void result) {
MessageBox.alert(info, "Opened Window", null);
btn.setEnabled(true);
window.hide();
}
});
}
});