Please help with me writing a JavaScript Validation for currency/money field.
So please provide any regular expressions if u have :)
Also, for my region, don't need any currency symbols like '$' in the field.
Only decimals are to be included for validation as special chars., along with numbers.
You could use a regexp:
var regex = /^\d+(?:\.\d{0,2})$/; var numStr = "123.20"; if (regex.test(numStr)) alert("Number is valid");
If you're not looking to be as strict with the decimal places you might find it easier to use the unary (+
) operator to cast to a number to check it's validity:
var numStr = "123.20"; var numNum = +numStr; // gives 123.20
If the number string is invalid, it will return NaN
(Not a Number), something you can test for easily:
var numStr = "ab123c"; var numNum = +numStr; if (isNaN(numNum)) alert("numNum is not a number");
It will, of course, allow a user to add more decimal places but you can chop any extra off using number.toFixed(2)
to round to 2 decimal places. parseFloat
is much less strict with input and will pluck the first number it can find out of a string, as long as that string starts with a number, eg. parseFloat("123abc")
would yield 123
.
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