Value.length pada element #datePicker ada kesalahan

$w.onReady( function () {
$w('#dropdown1, #inputNama, #dateSewa, #dropdown2, #dropdown3, #inputTujuan').onChange(function () {
        if ($w('#dropdown1').value.length > 0 && $w('#inputNama').value.length > 0 && $w('#dateSewa').value.length > 0 
		&& $w('#dropdown2').value.length > 0 && $w('#dropdown3').value.length > 0 && $w('#inputTujuan').value.length > 0) {
            $w('#buttonNext1').enable();
        } else { $w('#buttonNext1').disable(); }
});

What is the value of $w('#dateSewa').value? Is it null? Does it have a length?

it is a #datapicker element, not text

Since this value is a Date object it won’t have a length property. When Datepickers don’t have a date set then value is null so you can change that part to $w('#dateSewa').value and it should work:

$w.onReady( function () {
$w('#dropdown1, #inputNama, #dateSewa, #dropdown2, #dropdown3, #inputTujuan').onChange(function () {
        if ($w('#dropdown1').value.length > 0 && $w('#inputNama').value.length > 0 && $w('#dateSewa').value 
		&& $w('#dropdown2').value.length > 0 && $w('#dropdown3').value.length > 0 && $w('#inputTujuan').value.length > 0) {
            $w('#buttonNext1').enable();
        } else { $w('#buttonNext1').disable(); }
});

Thank you, your information is very helpful to me. Terimakasih…