Possible Duplicate:
Validate numbers in JavaScript - IsNumeric()
var miscCharge = $("#miscCharge").val();
I want to check misCharge is number or not. Is there any method or easy way in jQuery or JavaScript to do this?
HTMl is
<g:textField name="miscCharge" id ="miscCharge" value="" size="9" max="100000000000" min="0" />
function isNumber(n) {
return !isNaN(parseFloat(n)) && isFinite(n);
}
return !isNaN(+n) && isFinite(n) since for a numeric string with trailing letters the parseFloat | parseInt will return true and the second check isFInite will return false. While with unary + it will fail immediately.
You've an number of options, depending on how you want to play it:
isNaN(val)
Returns true if val is not a number, false if it is. In your case, this is probably what you need.
isFinite(val)
Returns true if val, when cast to a String, is a number and it is not equal to +/- Infinity
/^\d+$/.test(val)
Returns true if val, when cast to a String, has only digits (probably not what you need).
val is -1 or 1.5
isNaN('') == false and isFinite('') == true
there is a function called isNaN it return true if it's (Not-a-number) , so u can check for a number this way
if(!isNaN(miscCharge))
{
//do some thing if it's a number
}else{
//do some thing if it's NOT a number
}
hope it works
isNaN(null) returns false, isNaN("") returns false
isNaN(true) and isNaN(false) also return false