Let only positive numbers on texbox

[ale77]

I have a problem. I have a text input in a form and I want it to allow only numbers (no letters), a dot and non negative numbers. The problem is that is there is a dot in can only accept 9 characters, without a dot only 6 characters and cannot submit 0. Ex
135000
135000.56

 

[JeanPhil]

Here is a function that I use to validate currency. It accepts only numbers, dot and minus sign so you can use it and modify it for your needs. Call the function by putting ...

onkeypress="onlyDigits()"

... in your input field.


Here is the function :


function onlyDigits()
{
var IS_PERIOD = 46;
var PERIOD_TYPED = false;
var IS_HYPHEN = 45;
var HYPHEN_TYPED = false;
var _ret = true;

if (window.event.keyCode == IS_PERIOD)
{
if (!PERIOD_TYPED)
PERIOD_TYPED = true;
else
{
window.event.keyCode = 0;
_ret = false;
}
}
if (window.event.keyCode == IS_HYPHEN)
{
if (!HYPHEN_TYPED)
HYPHEN_TYPED = true;
else
{
window.event.keyCode = 0;
_ret = false;
}
}
if (window.event.keyCode < 45 || window.event.keyCode > 57)
{
window.event.keyCode = 0;
_ret = false;
}
}//END ONLYDIGITS


Hope it work for you !!

 

[tanderso]

How about something like this...

<form action=&quot;whatever&quot;>
<input type=&quot;text&quot; name=&quot;price&quot;>
<input type=&quot;button&quot; value=&quot;go&quot; onClick=&quot;checkPrice(this.form)&quot;>
</form>
...

function isPrice(p) 
{
  var filter = /^\d{1,6}(\.\d{2})?$/i;
  return filter.test(p);
}

function checkPrice(form)
{
  if (!isPrice(form.price.value)) {alert(&quot;Please enter valid price&quot;); return false;}
  else {form.submit();}
}

It hasn't been tested for syntax errors, but that's the general idea.

Sincerely,

Tom Anderson
Order amid Chaos, Inc.

http://www.oac-design.com

 

[ale77]

Thanks for your suggestions, I used them but in a different way. I just have one question about var filter = /^\d{1,6}(\.\d{2})?$/i;
What does the character i at the end means???

 

[Lrnmore]

ale77,

That's in case you have an &quot;uppercase&quot; number in there..
(Just kidding Tom);

It tells the expression to &quot;ignore&quot; case, normally used
with &quot;alpha&quot; chars'

And when you see &quot;g&quot; on the end that means &quot;global&quot;

 

[tanderso]

Yup, it makes it case insensitive. Force of habit. You can leave the &quot;i&quot; off for this regex.

Sincerely,

Tom Anderson
Order amid Chaos, Inc.

http://www.oac-design.com