TypeError: Cannot read property 'map' of undefined

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1

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This however only happens when i add this:


When i delete this code, the dataset refresh, runs great without any problems.

2 
import wixData from 'wix-data';
$w.onReady(() => {
	 $w("#dynamicDataset").refresh();
	let itemObj = $w("#dynamicDataset").getCurrentItem();
	$w("#balance").text = itemObj.money.toString();
	var balance;
	setTimeout(function () {
		balance = parseFloat($w('#balance').text);
		if (balance >= 1.20) {
			$w('#b1').enable();
		}
		if (balance >= 0.60) {
			$w('#b2').enable();
		}
		if (balance >= 1.70) {
			$w('#b3').enable();
		}
		if (balance >= 0.90) {
			$w('#b4').enable();
		}
	});
}, 500);
function topup() {
	let itemObj = $w("#dynamicDataset").getCurrentItem();
	console.log("Inside ToPup");
	var balance = itemObj.money;
	var input = parseFloat($w('#topup').value);
	if (input >= 1) {
		$w("#balance").text = itemObj.money.toString();
		var final = balance + input;
		let toUpdate = {
			"_id": itemObj._id,
			"firstname": itemObj.firstname,
			"lastname": itemObj.lastname,
			"photo": itemObj.photo,
			"energopaso": itemObj.energopaso,
			"liksipaso": itemObj.liksipaso,
			"energopaso2": itemObj.energopaso2,
			"liksipaso2": itemObj.liksipaso2,
			"energopaso3": itemObj.energopaso3,
			"liksipaso3": itemObj.liksipaso3,
			"money": parseFloat(final)
		};
		console.log("ToUpdate");
		wixData.update("passengers", toUpdate);
		$w("#balance").text = itemObj.money.toString();
		$w("#text20").text = "Επιτυχής Πίστωση " + input + "€.";
		$w('#text20').show("FadeIn");
		$w("#balance").text = itemObj.money.toString();
		if (itemObj.money >= 1.20) {
			$w('#b1').enable();
		}
		if (itemObj.money >= 0.60) {
			$w('#b2').enable();
		}
		if (itemObj.money >= 1.70) {
			$w('#b3').enable();
		}
		if (itemObj.money >= 0.90) {
			$w('#b4').enable();
		}
	} else {
		$w("#text20").text = "Ελάχιστο ποσό 1€.";
		$w('#text20').show("FadeIn");
	}
}

export function button1_click() {
	topup();
}
export function b1_click() {
        $w('#b1').disable();
		$w('#b2').disable();
		$w('#b3').disable();
		$w('#b4').disable();
		$w('#button3').show("FadeIn");
		$w('#text21').show("FadeIn");
}


export function button3_click() {
	let itemObj = $w("#dynamicDataset").getCurrentItem();
        if (itemObj.money >= 1.20) {
			$w('#b1').enable();
		}
		if (itemObj.money >= 0.60) {
			$w('#b2').enable();
		}
		if (itemObj.money >= 1.70) {
			$w('#b3').enable();
		}
		if (itemObj.money >= 0.90) {
			$w('#b4').enable();
		}
		$w('#button3').hide();
		$w('#text21').hide();
}
3

I know it is a little late but did you manage to find the problem?
I get the same error at line 17

// API Reference: Introduction - Velo API Reference - Wix.com
// “Hello, World!” Example: Velo Learning Center
import wixData from ‘wix-data’ ;
$w.onReady(() => {
let item = $w( “#dynamicDataset” ).getCurrentItem;
// substitute your field name storing the tags
let chosenValues = item.klimatisierung;
let newOptions = buildOptions(chosenValues);
$w( “#checkboxGroup3” ).options = newOptions;
// if you want them all checked?
let indices = buildSelectedIndices(chosenValues);
$w( “#checkboxGroup3” ).selectedIndices = indices;

});

function buildOptions(chosenValues) {
return chosenValues.map((curr) => {
return { label: curr.toString(), value: curr };
});
}

function buildSelectedIndices(chosenValues) {
let selIndices = ;
for ( var i = 0 ; i < chosenValues.length; i++) {
selIndices.push(i);
}
return selIndices;
}