javascript - Wicket 6.2 AbstractDefaultAjaxBehavior getCallbackUrl no longer resolves JS variables

Question

Recently I have been working on upgrading a big web application that was using wicket 1.4.18 to 6.2. We had a situation where we would create javascript variables to keep track of positioning within a drag and drop list. This is just the wicket side of the code since the js has always worked and has not been changed.

ListItem.add(new AbstractDefaultAjaxBehavior()
{
    private static final long serialVersionUID = 1L;

    @Override
    public void onComponentTag(ComponentTag tag)
    {
        tag.put("ondrop", "var value = $(ui.item[0]).attr('hiddenvalue');"
            + this.getCallbackScript());
    }


    @Override
    public final CharSequence getCallbackUrl()
    {
        return super.getCallbackUrl() + "&hiddenvalue' + value + '";
    }
}

However the problem I am running into is the javascript variables are not resolving to values and are now being taken as literal strings (Ex: 'value' instead of 5) in the getCallbackUrl. This was not the case in wicket 1.4.18 and I don't believe this problem originated in our migration to 1.5.8.

In the end we just want to be able to pull the value out using

@Override
protected void respond(AjaxRequestTarget target)
{
    getRequest().getRequestParameters().getParameterValue("hiddenvalue");
}

Any advice on this? I hope I have provided enough information. Thanks in advance for any help. Some of this is a little beyond my knowledge and can be intimidating not knowing where to look.

Answer 1

Wicket Ajax has been completely rewritten for Wicket 6. See this page for a detailed description.

In your case, you should use the new AjaxRequestAttributes like that:

@Override
protected void updateAjaxAttributes(final AjaxRequestAttributes attributes) {
    super.updateAjaxAttributes(attributes);
    attributes.getExtraParameters().put("hiddenvalue", "value");
}

Retrieval of the value from the request still works the same as before.

@Override
protected void respond(AjaxRequestTarget target)
{
    getRequest().getRequestParameters().getParameterValue("hiddenvalue");
}