I developed my code to show exchanged price from dataset multiplied by currency rate from bank:
$w.onReady( function () {
getCurrency() // is in backend
.then( (json) => { var rate = String(parseFloat(json.rates[0].ask.toString())) var cena1 = String(parseFloat($w(“#dynamicDataset”).getCurrentItem().price1)) var cenaPLN = String(rate*cena1) var cenazero = cenaPLN.toFixed(0) // problem is here
$w(“#text77”).text = cenazero + ’ PLN’
})
$w(“#dataset1”).onAfterSave(sendFormData);
});