Dynamical Loading mode allows to load data not all at once, but partially, by client-side request. It decreases initial loading time and loading of server.

To work correctly, on client-side should be enabled related mode:

• grid - smart rendering and paging modes
• treegrid - dynamic branch loading mode
• tree - dynamic branch loading mode
• combo - partial autocomplete ( you don't need it for normal autocomplete)
• dataview - dynamiс scrolling or dynamic paging

To activate the mode you should use the method dynamic_loading():

$grid->dynamic_loading([$rowsNum]);

Parameters:

• none for a tree,treegrid.
• number of rows which should be initially loaded (the value should be more than a number of rows visible in the grid, or at least any positive number) for a grid.
• maximum number of options which server will send to a combo in the 'autocomplete mode' for a single data request.

Normally, connector makes all operations automatically, and doesn't need customization.
But, in case of dynamic loading in tree/treeGrid, database can contain field indicated leaf or branch the current item is. In beforeRender event handler you are allowed to mark an item as a leaf or branch (it decreases a number of SQL queries and increases perfomance).

function custom_define($item){
		if ($item->get_value("is_a_branch"))
			$item->set_kids(true);
		else
			$item->set_kids(false);
}
$tree->event->attach("beforeRender","custom_define");

The same approach can be used for non-dynamical mode of tree/treeGrid as well. It's not obligatory but lets you increase data generation performance.