How to check if value is number

Question

I have this function :

 $scope.SearchTicketEvent = function (ticketPinOrEvent)
            {
                if (ticketPinOrEvent != undefined)
                {

                 if (ticketPinOrEvent.length == 10)
                    {

                     $scope.PinTicketSearch(ticketPinOrEvent);

                    }
                }


            }

How can i check if ticketPinOrEvent is number ? I tried with angular.isNumber(ticketPinOrEvent) but i dont get anything?

@dhavalcengg when i try with console log if i enter 1234567890 i get false — uzhas, Jul 22 '15 at 08:54
`angular.isNumber(1234567890)` => `true`. Check the value of your argument `ticketPinOrEvent`, which maybe `undefined`. — Joy, Jul 22 '15 at 08:55
@ShaojiangCai its not undefined...it i enter like u hardcoding number i get true but when i pass like parameters i get false — uzhas, Jul 22 '15 at 09:00
possible duplicate of [How to check that a number is float or integer?](http://stackoverflow.com/questions/3885817/how-to-check-that-a-number-is-float-or-integer) — Vineet, Jul 22 '15 at 09:00

dhavalcengg · Accepted Answer · 2015-07-22T09:15:11.883

45

If you want to use angular.isNumber

    if ( !isNaN(ticketPinOrEvent) && angular.isNumber(+ticketPinOrEvent)) {
    }

edited Jul 22 '15 at 09:15

answered Jul 22 '15 at 08:56

dhavalcengg

4,678
1
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why i need to use + ?? – uzhas Jul 22 '15 at 08:57
4

You must be taking this value from view using some text box or something else... for text box this is always a string.. you need to convert string to number before passing it to angular.isNumber method. + is overloaded operator to convert any value to number. – dhavalcengg Jul 22 '15 at 09:03
but what ever i enter then i get true...i enter ffffffffff it returns me true – uzhas Jul 22 '15 at 09:03
same as before...i get true if i enter leters and numbers – uzhas Jul 22 '15 at 09:08
`typeof NaN` will return a number in your case. NaN compares unequal `(via ==, !=, ===, and !==)` to any other value -- including to another `NaN` value. – Endre Simo Jul 22 '15 at 09:09
sorry.. i forget that.. I should use isNaN method of javascript updated my answer.. – dhavalcengg Jul 22 '15 at 09:17
@dhavalcengg again i get true both times(letters and numbers) – uzhas Jul 22 '15 at 09:27
Perfect answer, Thank you @dhavalcengg – El7or Oct 20 '19 at 14:33
what is this `angular` is it class ? – Rajanboy Aug 29 '22 at 02:39

score 8 · Answer 2 · answered Jun 28 '18 at 09:17

8

In Angular 6 this works without using any prefix.

Example:

if(isNumber(this.YourVariable)){
    // your Code if number
}
else {
    // Your code if not number
}

answered Jun 28 '18 at 09:17

MarmiK

5,639
6
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Endre Simo · Answer 3 · 2015-07-22T09:13:13.943

7

You might use the typeof to test if a variable is number.

if (typeof ticketPinOrEvent === 'number') {
    $scope.PinTicketSearch(ticketPinOrEvent);
}

Or might try this:

if (!isNaN(ticketPinOrEvent) && angular.isNumber(ticketPinOrEvent)) {
    $scope.PinTicketSearch(ticketPinOrEvent);
}

Testing against NaN:

NaN compares unequal (via ==, !=, ===, and !==) to any other value -- including to another NaN value. Use Number.isNaN() or isNaN() to most clearly determine whether a value is NaN. Or perform a self-comparison: NaN, and only NaN, will compare unequal to itself.

edited Jul 22 '15 at 09:13

answered Jul 22 '15 at 08:54

Endre Simo

11,330
2
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1

Angular 1.4.1 source code Line 628: `function isNumber(value) {return typeof value === 'number';}` – Joy Jul 22 '15 at 08:57

How to check if value is number

3 Answers3

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