Question

First, what I want to achieve:
Let’s say I’m doing some stuff in onClick() method of a AjaxLink. I want to give user some feedback with mid-status and continue on doing, and give another feedback.

To do this I thought of adding some component, or behaviour that would send ajax request immediately after being rendered onto page so that I could continue in onEvent() of this behaviour. How can I achieve something like this?

Answer 1

I have found out myself. It is enough to add such implementation of AbstractDefaultAjaxBehavior:

new AbstractDefaultAjaxBehavior() {
    @Override
    protected void respond(AjaxRequestTarget target) {

    }

    @Override
    public void renderHead(IHeaderResponse response) {
        super.renderHead(response);

        response.renderOnLoadJavascript(getCallbackScript().toString());
    }
}

respond(AjaxRequestTarget target) will be invoked when component it was added to is rendered.