forms - JavaScript Code is not Letting me Input Commas -

i trying make loan calculator allows maximum of 2 decimals typed @ once. unfortunately, have had add script input disallows commas inputted. not sure why not allow commas. commas purpose of separating every third number. example, 1,000,000.

a working example of page can seen at: http://thetotempole.ca/sales/loancalculator.php

i not looking suggestions, full solutions problem, please.

here script using currently:

<script> function trimdp(x, dp) {     x = parsefloat(x);     if (dp === 0)         return math.floor(x).tostring();     dp = math.pow(10, dp || 2);     return (math.floor((x) * dp) / dp).tostring(); }  window.addeventlistener('load', function () {     var nodes = document.queryselectorall('.dp2'), i;     function press(e) {         var s = string.fromcharcode(e.keycode);         if (s === '.')             if (this.value.indexof('.') === -1)                 return; // permit typing `.`         this.value = trimdp(this.value + s);         e.preventdefault();     };     function change() {         this.value = trimdp(this.value);     }     (i = 0; < nodes.length; ++i) {         nodes[i].addeventlistener('keypress', press);         nodes[i].addeventlistener('change', change);     } }); </script> 

and here input code:

<input type=text name=loan size=10 class="dp2"> 

you have couple of errors in there.

as have written comment. e.keycode wont work on firefox, @ least not work on mine. instead, should do

var s = string.fromcharcode(e.keycode || e.charcode); 

by doing e.preventdefault(); in keypress listener, disabling key presses, includes arrow keys, backspace, delete, etc.

i wont mention hundred time parsefloat.

more on determining key pressed.