I'm developing a small system but I noticed that there is a difference in using a loop for var and let, normally i always use let anyway but i decided to do some checks with var and that blew me away.
Example:
This works:
var inp = document.getElementsByTagName('input');
var focus = 0;
var inpLen = inp.length - 1;
inp[focus].focus();
for (let i = 0; i < inp.length; i++) {
const e = inp[i];
e.onkeyup = function () {
if (e.value.length == e.max) {
var leap = Math.min(i + 1, inpLen);
inp[leap].focus();
}
}
}<input type="number" max="2">
<input type="number" max="3">
<input type="number" max="2">
<input type="number" max="3">And it doesn't work:
var inp = document.getElementsByTagName('input');
var focus = 0;
var inpLen = inp.length - 1;
inp[focus].focus();
for (var i = 0; i < inp.length; i++) {
var e = inp[i];
e.onkeyup = function () {
if (e.value.length == e.max) {
var leap = Math.min(i + 1, inpLen);
inp[leap].focus();
}
}
}<input type="number" max="2">
<input type="number" max="3">
<input type="number" max="2">
<input type="number" max="3">My question is:
Why this happens, and how can I set my loop with var to work correctly