Why error ?
expected results = 1360000
result = 1000000360000
<script>
function hitungJumlah() {
var jumlah = document.getElementById("pinjam").value;
var lama = document.getElementById("kembalinya").value;
var bunga = lama * 12/100;
var biaya = document.getElementById("biaya").value = jumlah * bunga;
document.getElementById("total").value = jumlah + biaya;
}
</script>
Because it's read your data as string use parseInt() function to make your data as Integer
Try with this
parseInt(jumlah) + parseInt(biaya)
Beacuse 1000000 and 360000 act as string . + is also used for concatination in javascript
Because the * operator wont type coerce like + operator. Besides you may not have to use document.getElementById() all the time. You might simply do;
<script>
function hitungJumlah() {
var jumlah = Number(pinjam.value),
lama = Number(kembalinya.value),
bunga = lama * 12/100;
biaya.value = jumlah * bunga;
total.value = jumlah + biaya;
}
</script>
Though parseInt() and Number() have differences. While parseInt("42*10") would result 42, as a number object constructor Number("42*10") would result a NaN.
So be careful playing with them.
