Check box helper for Handlebars, based on the Rails check_box_helper

check_box.js

// Checkbox helper, based on http://api.rubyonrails.org/classes/ActionView/Helpers/FormHelper.html#method-i-check_box
// 
// Usage: 
// {{check_box object name="test" type="checkbox" value=true hidden="false"}}
//
// Note that the value in the hash can be specified with/without quotes so a proper type comparison
// can be made.
//
Handlebars.registerHelper('check_box', function(context, options) {
  var checked = context !== undefined && context == options.hash.value ? 'checked' : '', 
      str     = '<input ',
      hidden  = options.hash.hidden;
  
  delete options.hash.hidden;
  
  _.each(options.hash, function(val, key) {
    str = str + key + '="' + val + '" ';
  });
  str = str + checked + '>';
  
  // create a hidden form element to send unchecked values back to the server
  if (hidden !== undefined) {
    var hstr = '<input type="hidden" name="' + options.hash.name + '" value="' + hidden + '">';
    str = hstr + str;
  }
  
  return new Handlebars.SafeString(str);
});