Question

I am looking to do something very similar to the following PHP code but in javascipt:

for ($weenumber = 1; $weenumber <= 30; $weenumber++)
{ 
    $weenumber = str_pad($weenumber, 2, "0", STR_PAD_LEFT);
    echo $_POST["entry{$weenumber}_cash"];
} 

Basically accessing the loop number padded with a trailing 0 if less than 10 but I dont know the syntax in JS to do this 🙁

Sorry for noob style question

Answer 1

I think that you mean a leading zero rather than a trailing zero…

You can for example use the conditional operator:

(n < 10 ? '0' : '') + n

You could also implement a general purpose function:

function padLeft(str, len, ch) {
  while (str.length < len) str = ch + str;
  return str;
}

To access an object property by name in Javascript you use brackets. Example:

var value = obj['entry' + (n < 10 ? '0' : '') + n + '_cash'];

If n contains 4, this will be the same as obj.entry04_cash.