eventual result of an asynchronous operation ('promise' object) for the loaded data
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());
});
The ultimate advantage of Promise objects is that they allow treating the result of asynchronous operations without callbacks.