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I'm looking for a good Javascript equivalent of the C/PHP printf() or for C#/Java programmers, String.Format() (IFormatProvider for .NET).

My basic requirement is thousand seperator format for numbers for now, but something that handles lots of combinations (including dates) would be good.

I realise Microsoft's AJAX library provides a version of String.Format() but we don't want the entire overhead of that framework.

flag	asked Mar 4 '09 at 12:53 Chris S 7,167●4●19●38 87% accept rate

Gumbo · Answer 1 · 2009-03-04 12:55:22Z

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Try sprintf() for JavaScript.

answered Mar 4 '09 at 12:55

Gumbo♦
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love it, works great. – Cheeso Dec 27 '09 at 23:43

Chris S · Answer 2 · 2009-07-20 22:26:19Z

I'll add my own discoveries which I've found since I asked:

Sadly it seems sprintf doesn't handle thousand seperator formatting like .NET's string format.

Pooria · Answer 3 · 2009-03-04 12:55:53Z

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Hi there,

There are "sprintf" for javascript which you can find it from here: http://www.webtoolkit.info/javascript-sprintf.html

Regards, Pooria.

answered Mar 4 '09 at 12:55

Pooria
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17 of 26 · Answer 4 · 2009-03-04 13:10:59Z

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If you are looking to handle the thousands separator, you should really use toLocaleString() from the Javascript Number class since it will format the string for the user's region.

The Javascript Date class can format localized dates and times.

answered Mar 4 '09 at 13:10

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It's actually a set by the user as a setting in the application (not the machine their on) but I'll take a look, thanks – Chris S Mar 4 '09 at 13:19

Sven N · Answer 5 · 2009-09-27 08:36:00Z

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I use a small library called String.format for JavaScript which supports most of the format string capabilities (including format of numbers and dates), and uses the .NET syntax. The script itself is smaller than 4 kB, so it doesn't create much of overhead.

answered Sep 27 '09 at 8:36

Sven N

I took a look at that library and it looks really great. I was pissed off when I saw that the download was an EXE. What the heck is that about? Didn't download. – jessegavin Apr 6 at 18:04

Javascript printf/string.format

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