---
layout: page
title: "JavaScript vprintf function"
comments: true
sharing: true
footer: true
alias:
- /functions/view/vprintf:579
- /functions/view/vprintf
- /functions/view/579
- /functions/vprintf:579
- /functions/579
---
<!-- Generated by Rakefile:build -->
A JavaScript equivalent of PHP's vprintf

{% codeblock strings/vprintf.js lang:js https://raw.github.com/kvz/phpjs/master/functions/strings/vprintf.js raw on github %}
function vprintf (format, args) {
  // From: http://phpjs.org/functions
  // +      original by: Ash Searle (http://hexmen.com/blog/)
  // +      improved by: Michael White (http://getsprink.com)
  // + reimplemented by: Brett Zamir (http://brett-zamir.me)
  // -       depends on: sprintf
  // *        example 1: vprintf("%01.2f", 123.1);
  // *        returns 1: 6

  var body, elmt;
  var ret = '',
    d = this.window.document;

  // .shift() does not work to get first item in bodies
  var HTMLNS = 'http://www.w3.org/1999/xhtml';
  body = d.getElementsByTagNameNS ? (d.getElementsByTagNameNS(HTMLNS, 'body')[0] ? d.getElementsByTagNameNS(HTMLNS, 'body')[0] : d.documentElement.lastChild) : d.getElementsByTagName('body')[0];

  if (!body) {
    return false;
  }

  ret = this.sprintf.apply(this, [format].concat(args));

  elmt = d.createTextNode(ret);
  body.appendChild(elmt);

  return ret.length;
}
{% endcodeblock %}

 - [Raw function on GitHub](https://github.com/kvz/phpjs/blob/master/functions/strings/vprintf.js)

Please note that php.js uses JavaScript objects as substitutes for PHP arrays, they are 
the closest match to this hashtable-like data structure. 

Please also note that php.js offers community built functions and goes by the 
[McDonald's Theory](https://medium.com/what-i-learned-building/9216e1c9da7d). We'll put online 
functions that are far from perfect, in the hopes to spark better contributions. 
Do you have one? Then please just: 

 - [Edit on GitHub](https://github.com/kvz/phpjs/edit/master/functions/strings/vprintf.js)

### Example 1
This code
{% codeblock lang:js example %}
vprintf("%01.2f", 123.1);
{% endcodeblock %}

Should return
{% codeblock lang:js returns %}
6
{% endcodeblock %}


### Other PHP functions in the strings extension
{% render_partial _includes/custom/strings.html %}