Formatting Hex in Javascript

Question

How can I format a hex to be displayed always with 4 digits in javascript?

For example, I converting a decimal to hex :

port = 23
function d2h(d) {return (+d).toString(16);}
d2h(port)

I am successfully able to convert "23" to the hex value "17". However, I would like to be formatted like this "0017" (with four digits -- appending 0's before the 17).

All information would be greatly appreciated.

score 12 · Accepted Answer · answered Oct 15 '13 at 17:37

12

Here is an easy way:

return ("0000" + (+d).toString(16)).substr(-4);

Or:

return ("0000" + (+d).toString(16)).slice(-4);

answered Oct 15 '13 at 17:37

bfavaretto

71,580
16
111
150

That worked perfectly!! I use the slice method... Thanks!!!! – Omar Santos Oct 15 '13 at 17:53

score 0 · Answer 2 · answered Oct 15 '13 at 17:36

0

You can use sprintf http://www.diveintojavascript.com/projects/javascript-sprintf

I havent tried it yet but something like this should work:

sprintf("%.4X", d)

answered Oct 15 '13 at 17:36

PGJ

126
4

Formatting Hex in Javascript

2 Answers2