[thelist] javascript comparison

[Jason Handby]

Hi Rob,


> My javascript test is testing supposedly numerical values as strings, when
> they should be compared by actual value.

<snip>

> Is there a way I can cast values in javascript?


You can use the parseInt() function to convert them to integers:

	if (parseInt(bid.previousbid.value) > parseInt(bid.nextbid.value) )
	{
		alert("Please enter a bid greater than $" + bid.previousbid.value + ".");
		  return false;
	}
	else
	{
		document.bid.submit();
		return true;
	}


You should also check to make sure they actually *are* integers. If
parseInt() can't convert them to integers for any reason it returns a
constant called NaN (= Not a Number), so you should also check for that
somewhere in your form validation function, e.g.:

	if (parseInt(bid.previousbid.value) == NaN || parseInt(bid.nextbid.value)
== NaN)
	{
		alert("Naughty!");
		return false;
	}


(If you decide you want to allow non-integer amounts (dollars and cents) you
might want to use parseFloat() instead.)


HTH




Jason