How can i remove zero from input number in form javascript?

Question

I have this code and I want to remove first zero from phone number.

mobile = $('#country_code').val();
        mobile += input.val();

Country code is: 966

Phone input is: 055642444

And output in this code is: 966055642444

I want it to be 96655642444 without zero after country code.

Thanks

Does this answer your question? [How to use Javascript slice to extract first and last letter of a string?](https://stackoverflow.com/questions/19951188/how-to-use-javascript-slice-to-extract-first-and-last-letter-of-a-string) — Eldar B., Sep 17 '21 at 08:37
You can call `parseInt()` or `Number()` on the string to turn it into an int, which will remove leading zeros. Or you can use `.replace(/^0+/, '')` — , Sep 17 '21 at 08:42
@Chris G: Cant phone numbers start with multiple zeros? Atleast my office number does. — Lain, Sep 17 '21 at 08:47
@Lain yes, which is why the dupe I linked and the three ways in my comment all remove one or more leading zeros :) — , Sep 17 '21 at 08:52
@Chris G: Exactly. Is it not wrong to remove more than one zero? If I try to call my number with all of them removed I get *invalid number*. It works without country code and the zeros or with adding the country code and only removing the first zero. — Lain, Sep 17 '21 at 08:53
@Lain I see, I misread your comment. I'm reasonably sure that local phone numbers in Kyrgyzstan all have just one leading zero ;) just kidding, no idea, but OP will surely tell us — , Sep 17 '21 at 08:56

score 2 · Answer 1 · answered Sep 17 '21 at 08:41

You can use substring to remove the first N characters from a string.

First of all, assign a variable with the value of input.val()

let str = input.val()

Now, you can index the Nth element of str and check its value:

if (str[0] === "0") str = str.substring(1)

With this, you have successfully checked if the first character is "0" and reassigned the str variable accordingly.

score 1 · Answer 2 · answered Sep 17 '21 at 08:40

1

Have you tried parseInt(), integers don't have leading 0s - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/parseInt

mobile = $('#country_code').val();
        mobile += parseInt(input.val());

answered Sep 17 '21 at 08:40

Michael Butler

159
6

score 1 · Answer 3 · answered Sep 17 '21 at 08:44

For this, I'd use substring which returns a new string. Example :

mobile = '0652447766';
mobile = mobile.substring(1)
console.log('mobile = ', mobile)

>> mobile = '652447766'

Warning ! Calling mobile.substring() doesn't actually modify mobile ! Strings are immutable in Js, so you'll have to get the returned value of substring() with mobile = mobile.substring(1)

Hope it helped !

Petr Fořt Fru-Fru · Answer 4 · 2021-09-17T10:00:21.077

If you store the value of the phone number in the html element <input> as a string - like this:

<input type='text' />

Then just use the native javascript parseInt() method to remove the leading zero, which removes the leading zero.

Like this:

const withoutZero = parseInt(input.val());

Or you can leave the value as a string, and if the string starts with "0", you can also delete it as follows:

const withoutZero = input.val().replace(/^0+/, '');

How can i remove zero from input number in form javascript?

4 Answers4