CODEWITHSUNDEEP
javaajaxwicket
Otis Ottington
Otis Ottington

Reputation: 435

Wicket - loading data into table after page is rendered

In my wicket application I have a datatable. A dataprovider is attached to it and loads the content from a REST-Service. This call needs a lot of time (~ 20 seconds).

So, is there a way to load the page with an empty table and then refilling it after being rendered with data from the Service?

I thought about reattaching or reloading the dataprovider after the page is rendered:

onAfterRender()

But I still don't know how to do that with a dataprovider.

Upvotes: 0

Views: 909

Answers (1)

Imperative
Imperative

Reputation: 3183

You could take a look at the AjaxLazyLoadPanel which shows a little loading icon as placeholder while the Component is loaded.

add(new AjaxLazyLoadPanel("table") {

    @Override
    public Component getLazyLoadComponent(String markupId) {
        return new MyLongLoadingTable(markupId);
    }
});

Another solution: show the empty table and periodically check for the database operation to complete and update the table when all data gathering has been done. The AbstractAjaxTimerBehavior is a good utility. Like this:

add(new AbstractAjaxTimerBehavior(Duration.ONE_SECOND) {

    @Override
    protected void onTimer(AjaxRequestTarget target) {

        if (isDataLoaded()) {
            stop(target);
            target.add(table);
        }

    }

});

Upvotes: 4

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