JavaScript Validation - Numeric input only and working backspace

Question

I work on input validation (numeric input from kaybord only). Which works fine but the problem is that i can not use backspace button. Delete button works well.

My code:

function validate(evt) {
  var theEvent = evt || window.event;
  var key = theEvent.keyCode || theEvent.which;
  key = String.fromCharCode( key );
  var regex = /[0-9]|\./;
  if( !regex.test(key) ) {
    theEvent.returnValue = false;
    if(theEvent.preventDefault) theEvent.preventDefault();
  }
}

I know i should adjust regex but im not so sure how ... need help on this one

Thanks a lot in advance ..

var regex = /^[0-9_\b]+$/; - numbers only + backspace

Nita
– Nita

2013-05-06 07:07:50 +00:00
Commented May 6, 2013 at 7:07 — Nita
– Nita, Commented May 6, 2013 at 7:07

Nita · Accepted Answer · 2013-05-10 11:47:20Z

1

Its all working.. numeric input + working bacspace

    function validate(evt) {
  var theEvent = evt || window.event;
  var key = theEvent.keyCode || theEvent.which;
  key = String.fromCharCode( key );
  **var regex = /^[0-9_\b]+$/;**
  if( !regex.test(key) ) {
    theEvent.returnValue = false;
    if(theEvent.preventDefault) theEvent.preventDefault();
  }
}

answered May 10, 2013 at 11:47

Nita

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