waitData

eventual result of an asynchronous operation (‘promise’ object) for the loaded data

 let waitData: promise

Example

var grid = webix.grid({
    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.