how to validate numeric value by using Javascript

[kang jia]

hi, now i want to validate numeric value which user filled in in text box, it can have 2 decimal places. what is the regular expression i can use to achieve this? anyone can help?

can reply me ASAP, it is urgent. thanks in advance

[menocomp]

function CheckIntegers(e)
    {
        var keynum
        var keychar
        var numcheck
        if(window.event) // IE
        {
            keynum = e.keyCode
        }
        else if(e.which) // Netscape/Firefox/Opera
        {
            keynum = e.which
        }
        keychar = String.fromCharCode(keynum)
        numcheck = /\d/
        return numcheck.test(keychar)
    }

[gits]

hi ...

you may use a regEx but a simple way is to check the value you want with:

isNaN(value)

that returns true in case value isN(ot)aN(umber) ... otherwise it returns false ;)

kind regards

[kang jia]

function CheckIntegers(e)
    {
        var keynum
        var keychar
        var numcheck
        if(window.event) // IE
        {
            keynum = e.keyCode
        }
        else if(e.which) // Netscape/Firefox/Opera
        {
            keynum = e.which
        }
        keychar = String.fromCharCode(keynum)
        numcheck = /\d/
        return numcheck.test(keychar)
    }

besides this long method, do you know any regular expression which can help to check number value and its decimal places( i only need 2 decimal places). thanks for it.