Scroll Loader in GWTPagination is a normal and popular method of splitting data across pages. However, a new method has emerged (I forgot where I read about it first). Instead of distributing data across several pages (which is pretty non-Ajax), you place a scrollpanel around the data and load data when the scrollbar reaches the bottom.
See an example here.
Implementing this is actually pretty easy, especially with Google Web Toolkit. I've created a custom widget called ScrollAutoLoader, which handles scroll events. When used, you can implement scroll loading like this:
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public class Module implements EntryPoint {
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private int count;
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private ScrollAutoLoader loader;
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public void onModuleLoad() {
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final VerticalPanel panel = new VerticalPanel();
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loader = new ScrollAutoLoader(panel, new Loader() {
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public void load(int offset, int limit) {
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panel.add(new Label("Line " + ++count));
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loader.fill();
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}
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}, 5);
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loader.setHeight("300px");
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RootPanel.get().add(loader);
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loader.fill();
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}
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}
I've used the widget a couple of places, and it works pretty good. It might, however, be too slow if there are a lot of pages, as the browser tends to slow down when the inner panel becomes too large.
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