How to show number 4 digit (0000,0001) number using JavaScript

Question

I want my output as 0000, 0001, 0002. If i use normal js math then the result come 0,1,2

var count=0000+1;
document.write(count);

Output is 1

But i want output as 0001

how to do this?

Answer 1

The + operator in Javascript is used for both addition and concatenating depending on the operands. 0000+1 is just adding zero and one, which gives one. You can concatenate the string "000" to the number 1 and it will give you the string "0001", which is what you're looking for.

Here's a function that will always have 4 digits, with leading zeros. It works by concatenating the string "000" and your number, then shortening, if needed, to 4 characters.

function pad(n) {
    var s = "000" + n;
    return s.substr(s.length-4);
}

Answer 2

You can use lodash's padStart

You can use it like:

var count = 1;
_.padStart(count, 4, '0');
//this will give you 0001
_.padStart(23, 4, '0');
//this will give you 0023

Answer 3

Use:

var count = 1;
document.write( '0000'.substr( String(count).length ) + count  );

Answer 4

This is not possible using integer, but you can do something like,

"000"+1

output => "0001"

P.S: Maybe if you share your use case, I can help you better.

Answer 5

Add the zeros and then remove the ones that are left over:

function renameArtboards(){  
     var docRef = app.activeDocument;  
     var aB = docRef.artboards;  
     for(var a=0;a<aB.length;a++){  
          var curAB = aB[a];  
          var sNumber = "000" + [a+1];
          curAB.name = sNumber.substr(sNumber.length-4);
     }  
}  
renameArtboards();  

Answer 6

I know I'm an year and a half late but I happen to need this kind of logic in my app right now. The most "elegant" solution in my opinion is this one:

const yourNumber = 32;
const defaultFill = "0000"

const formattedNumber = (defaultFill + yourNumber).substr(String(yourNumber).length)

This one works just fine for my use-case. It may have some limits if you have to handle numbers with more than 4 digits – in that case you could lose some information on the way. Be aware of that.

I hope this helped you, cheers!

Answer 7

var JobNumber = 'JB-00000';
var digistextraction = JobNumber.substr(3,5);

var JobNumberTable=[];
for (var j = 0; j < 5; j++) {
    k=1;
    digistextraction = parseInt(digistextraction) + k;
    JobNumberTable.push('JB-' + digistextraction.toLocaleString(undefined, {useGrouping: false, minimumIntegerDigits: 5}));
    k++;
}
console.log(JobNumberTable);

Answer 8

Best way is

var NumberWithLeadingZeroes = "000" + 1;
alert(NumberWithLeadingZeroes);//Will give you "0001"

UPDATE

function NumberWithLeadingZeroes (n)
{
    if ( n< 10 )
    {
        return ( '000' + n.toString () );
    }
    else if ( n< 100 )
    {
        return ( '00' + n.toString () );
    }
    else if ( n< 1000 )
    {
        return ( '0' + n.toString () );
    }
    else
    {
        return ( n);
    }
}