Disable zooming for iPhone using jQuery

nomobilezooming.coffee

jQuery(document).ready ($) ->

  ###*
   * Init function for domready
   *
   * @return boolean true
  ###
  init = ->
    resetViewportMeta()
    true

  ###*
   * Gets the window width
   *
   * @return integer width in pixel
  ###
  getWindowWidth = ->
    windowWidth = window.innerWidth
    if !windowWidth
      windowWidth = $('body').width()
    windowWidth

  ###*
   * Reset the viewport meta definition
   *
   * @param integer minimum width in pixel to disable zooming
   * @return boolean true
  ###
  resetViewportMeta = (minSize = 480) ->
    if getWindowWidth() <= minSize
      $('head meta[name=viewport]').attr 'content', 'width=device-width, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0, user-scalable=0"
    true

  init()

nomobilezooming.js

jQuery(document).ready(function($) {

  /**
   * Init function for domready
   *
   * @return boolean true
  */
  var getWindowWidth, init, resetViewportMeta;
  init = function() {
    resetViewportMeta();
    return true;
  };

  /**
   * Gets the window width
   *
   * @return integer width in pixel
  */
  getWindowWidth = function() {
    var windowWidth;
    windowWidth = window.innerWidth;
    if (!windowWidth) {
      windowWidth = $('body').width();
    }
    return windowWidth;
  };

  /**
   * Reset the viewport meta definition
   *
   * @param integer minimum width in pixel to disable zooming
   * @return boolean true
  */
  resetViewportMeta = function(minSize) {
    if (minSize == null) {
      minSize = 480;
    }
    if (getWindowWidth() <= minSize) {
      $('head meta[name=viewport]').attr('content', 'width=device-width, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0, user-scalable=0');
    }
    return true;
  };

  return init();
});