JavaScript - Currency Function

Nice little US currency validation function. Nice to use when wanting to validate a textbox on a web form that is for the user to enter a dollar amount.

Live working version

Give it a try. Hope you like it. :D

You have a very fancy solution.

I just thought I would provide a one-line alternative for those that didn't need the extra features or overhead.

Code:

---

function isUSCurrency (sString) {
  return RegExp(/^\$?\d+(\.\d{2})?$/).test(String(sString).replace(/^\s+|\s+$/g, ""));
}

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It can be modified to meet specific needs or tolerances.

Thanks for the post Travis! It was a great starting point.

I've tweaked Travis' RegExp a little to allow for commas:

bIsValidCurrency = RegExp(/^\$?[0-9\,]+(\.\d{2})?$/).test(String(txtValue).replace(/^\s+|\s+$/g, ""));

You could also allow for negative currency values with:

bIsValidCurrency = RegExp(/^-?\$?[0-9\,]+(\.\d{2})?$/).test(String(txtValue).replace(/^\s+|\s+$/g, ""));