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How do I check the value of a currency using JavaScript?

I have multiple input fields on a page and I want to check if they contain currency values ​​like $ 100 or Euro.

Anyone have an idea or example?

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2 answers


regex can confirm this for you:

/[\$£¥]\d+(\.\d\d)?/

(but with the euro sign there too)



this one i gave won't be the most reliable way to do it. You can change your preference. An alternative is to try something like this:

var myString = "$55.32",
    currency = parseFloat(myString.replace(/^[^\d\.]*/, ''))
    valid = !isNaN(currency)
;

It removes any non-numbers or characters .

from the beginning and then parses it as a float.

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The problem is here three times:

  • the number of currency symbols ;
  • Currency has the same symbol (for example, US dollar or US dollars); and
  • Differences between languages ​​in the spelling of numbers (eg 3000.00 in English - 3000.00 in German).


My advice? Just take the numbers and forget about the currency symbol. If, however, currency detection is a whole point, then either select it separately or you will need to implement at least a subset of the above list of currencies plus the differences in locale.

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