src/virtual-scrolling-tree/VirtualScrollingTree.js
function requestData() {
    let visible = Math.ceil(_(this).parent.offsetHeight / _(this).itemHeight);
    let scrollIndex = Math.floor(_(this).view.scrollbar.scrollTop / _(this).itemHeight);
    let request = buildRequest.call(this, scrollIndex, visible);
    _(this).request = request;
    _(this).onDataFetch(request, setData.bind(this));
}
function requestData() {
    let visible = Math.ceil(_(this).parent.offsetHeight / _(this).itemHeight);
    let scrollIndex = Math.floor(_(this).view.scrollbar.scrollTop / _(this).itemHeight);
    let request = buildRequest.call(this, scrollIndex, visible);
    _(this).request = request;
    _(this).onDataFetch(request, setData.bind(this));
}
function requestData ( ) { let visible = Math . ceil ( _ ( this ) . parent . offsetHeight / _ ( this ) . itemHeight ) ; let scrollIndex = Math . floor ( _ ( this ) . view . scrollbar . scrollTop / _ ( this ) . itemHeight ) ; let request = buildRequest . call ( this , scrollIndex , visible ) ; _ ( this ) . request = request ; _ ( this ) . onDataFetch ( request , setData . bind ( this ) ) ; }
Builds query, and triggers the onDataFetch call for the developer.
When the developer calls success the data of the tree gets updated.

@method requestData
@private
Builds query and triggers the onDataFetch call for the developer . When the developer calls success the data of the tree gets updated .