waitData of ui.tree, Others Webix Docs
eventual result of an asynchronous operation ('promise' object) for the loaded data
promise waitData;
Example
var grid = webix.ui({
view:"datatable", //any data object
url:"data.php",
});
grid.waitData.then(function(){
// when we have data, do some actions
grid.select(grid.getFirstId());
});
Details
The ultimate advantage of Promise objects is that they allow treating the result of asynchronous operations without callbacks.
See also
If you have not checked yet, be sure to visit site of our main product Webix html5 library and page of tree ui product.