I recently hit by double/repeated submission problem due to AjaxChannel.Type
defaults to ACTIVE.So we're using a Modal which submits a form using an
AjaxButton, markup using However this enables the user to
double/multi-click the button, hence multi-submitting the form.We tried to
circumvent this by disabling the button/link during AJAX call :/** *
Disables the component via JavaScript before AJAX, and re-enables it again
after AJAX success or failure. * Note that you still need to use a {@link
AjaxChannel.Type#ACTIVE} {@link AjaxChannel}, because the default * is
{@link AjaxChannel.Type#QUEUE}. * * @see AutoDisableAjaxButton * @author
rudi */public class AutoDisableAjaxCallListener extends AjaxCallListener {
private static final long serialVersionUID = 1L; @Override public
CharSequence getPrecondition(Component component) { return "if
($(this).attr('disabled') != undefined) return false;\n" +
super.getPrecondition(component); } @Override public
CharSequence
getBeforeSendHandler( Component component) { return
"$(this).attr('disabled', 'disabled');\n" +
super.getBeforeSendHandler(component); } @Override public
CharSequence
getCompleteHandler( Component component) { return
super.getCompleteHandler(component) + "\n$(this).attr('disabled', " +
(component.isEnabledInHierarchy() ? "null" : "'disabled'") + ");";
}}However
this doesn't work as intended because Wicket queues the AJAX call, so multi
clicks will still submit multiple times.We need to use
AjaxChannel.Type.ACTIVE : @Override protected void
updateAjaxAttributes(AjaxRequestAttributes attributes) {
super.updateAjaxAttributes(attributes); attributes.setChannel(new
AjaxChannel("autodisable", AjaxChannel.Type.ACTIVE));
attributes.getAjaxCallListeners().add(new AutoDisableAjaxCallListener());
}I
wonder why this defaults to QUEUE, since QUEUE results in double
submission.Using ACTIVE already prevents double submission, with or without
AjaxCallListener. (since AjaxCallListener impl above is mostly cosmetic, the
behavior is still defined by AjaxChannel)I'd propose a change of default for
Wicket 7.0 if the reason is accepted.Hendy
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