alert if input val = NaN?

Question

I know this question might have been asked a lot of times but I don't really get the function isNan(). I have a calculator and if the result is "NaN" (for example 0 divided by 0), I want to alert 'Doesn't work!'. I thought of something like:

function Error() {
    if ($('#result').val() == NaN) {
        alert.('Doesn't work!');
    }
};

The result is in the input with the #result. How do i use isNan() here? Can someone help me please? Thanks for responding and sorry for the same question again.

Everything that comes from HTML is a **String**. I cannot be a Number (or `NaN`). — Álvaro González, Jan 03 '17 at 08:56

Amit Jamwal · Accepted Answer · 2017-01-03T08:53:56.870

1

function Error() {
            if(isNaN($('#result').val())){
                alert("Doesn't work!");
            }
        };

Hope this helps...

edited Jan 03 '17 at 08:53

answered Jan 03 '17 at 08:50

Amit Jamwal

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don't you see the alert syntax is wrong. – Suchit kumar Jan 03 '17 at 08:53
Thanks @Suchit didn't notice that... – Amit Jamwal Jan 03 '17 at 08:54
Thank you alot, it's embarassing for me.. – Syno Jan 03 '17 at 08:56

alert if input val = NaN?

1 Answers1