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# Working with numbers

Anyone know of a quick method to make numbers input from a textbox work with
math. For example, if I have a text box where people might enter a value
like:

\$567,000.23

I want to work with only 567000.23

Is there an easy way to do that? Thanks, Ike
Jul 23 '05 #1
3 1201
*Ike* wrote:
Anyone know of a quick method to make numbers input from a textbox
work with math. For example, if I have a text box where people might
enter a value like:

\$567,000.23

I want to work with only 567000.23

Is there an easy way to do that? Thanks, Ike

To reduce the degree of variation in the input data I'd provide the user
with unambiguous input boxes where the currency unit can be selected in
isolation, the integer money units are then input in one box and the
small change goes in another box. That way the user doesn't have to make
any decisions as to what the currency format should be since there is no
choice! Any extraneous characters in the input can then be queried more
successfully.

That said, if you don't want to do that then the following is a starter:

var strInput = "\$567,000.23";
var dblInput = strInput.replace(/[^\d\.]/g, "");

You can then check isNaN(dblInput). However, the above won't work for
the large number of countries that interchange . and , delimiters in
numbers - e.g. the above won't work for: Euro567.000,23
--
Andrew Urquhart
- FAQ: www.jibbering.com/faq/
Jul 23 '05 #2
Ike wrote:
Anyone know of a quick method to make numbers input from a textbox work with
math. For example, if I have a text box where people might enter a value
like:

\$567,000.23

I want to work with only 567000.23

Is there an easy way to do that? Thanks, Ike

value= + (value.replace(/[\$,]/g,""))
if(!isNaN(value)){
// It's a number, use number in calculations
}

Place any unwanted character into the bracket.

[Ł˘ \$Ą,€]

Pound sterling, US cent, space, US dollar, yen, euro.
Mick
Jul 23 '05 #3
JRS: In article <KI***************@newsfe6-gui.server.ntli.net>, seen
in news:comp.lang.javascript, Andrew Urquhart <useWebsiteInSignatureToRe
pl*@spam.invalid> posted at Tue, 29 Jun 2004 12:59:08 :

You can then check isNaN(dblInput). However, the above won't work for
the large number of countries that interchange . and , delimiters in
numbers - e.g. the above won't work for: Euro567.000,23

The browser's decimal separator is
Char = 1.5.toString().charAt(1) // tested only in UK IE4
// (3/2) might be safer

I don't know of anywhere offhand that uses a character other than the
(keyboard) . or , characters, ASCII 46 and 44. Anyone?

But there may well be one or more other Unicode decimal separators; and,
if so, I know of one person who, it must be supposed, would use nothing
but one of those.

In addition to stripping the expected, or any, unwanted characters, one
can if necessary rectify the decimal separator before conversion to
Number.

Actually, one should not strip the currency indication; if it can be
ignored, it should be forbidden, and otherwise it needs to be
considered.

In some contests, it may be necessary to consider alien formats for
negative numbers.

--
Web <URL:http://www.merlyn.demon.co.uk/> - FAQqish topics, acronyms & links;
some Astro stuff via astro.htm, gravity0.htm; quotes.htm; pascal.htm; &c, &c.
No Encoding. Quotes before replies. Snip well. Write clearly. Don't Mail News.
Jul 23 '05 #4

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