jQuery to make sure field is currency

JavaScript
1

I have a text field with id=amount.

How can I use JQuery to check that it only contains the digit 1234567890 and one and only one “.” symbol?

2 
if (/^\\d+\\.\\d{2}$/.test($('#amount').val())) {
  // correct format
}

Note that the way I’ve set it up, it only allows two numbers after the dot. If you want it to be any number, replace the {2} with a +.

3

I tested it with all the scenarios I can think of and it works perfect. Thanks.

4

I know in my specification I mentioned I wanted at least one decimal and then the code given is correct.

However, in the event that if someone wanted the decimal portion to be optional then one can do …

/^\\d+(\\.\\d{2})?$/

in case anyone else was interested.