I have a code that takes some numbers from a user.I want to ensure that the data given from the user are numbers and not strings.From my knowledge to vb6 I know i can use IsNumeric so I was wondering if there is any similar function to js
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stackoverflow.com/questions/18082/…juvian– juvian2014-12-04 19:06:25 +00:00Commented Dec 4, 2014 at 19:06
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isFinite() is the closest matchdandavis– dandavis2014-12-04 19:16:42 +00:00Commented Dec 4, 2014 at 19:16
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3 Answers
use isNaN() and pass a string or number to it. It will return true or false. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/isNaN
Comments
Try
var input = 1;
console.log(typeof input === "number");
See typeof
var input1 = 1, input2 = "1";
console.log(typeof input1 === "number", typeof input2 === "number");
Comments
Per the question previously asked here: Is there any function like IsNumeric in javascript to validate numbers
You can find an elegant function to create within your own library as follows:
function isNumeric(n) {
return !isNaN(parseFloat(n)) && isFinite(n);
}
