The event occurs when a grid cell is clicked. You can get more information where exactly the user has clicked.
let rowElement =app.getFieldValue("myGrid.clickedRow"); //The html Row element (a tr)let cellElement =app.getFieldValue("myGrid.clickedCell"); //The html Cell element (a td)let cellId =app.getFieldValue("myGrid.clickedCellId"); //column id of the clicked cell (e.g. "adrFirstName")