handlebars-helpers.js

/*globals Handlebars, moment, jQuery */

(function($) {
  // Get the current url
  Handlebars.registerHelper('windowLocation', function(place_id) {
    return window.location;
  });

  // Change new lines to <br> tags. This one is better than Swag.
  Handlebars.registerHelper('nlToBr', function(str) {
    if (str) {
      str = Handlebars.Utils.escapeExpression(str);
      return new Handlebars.SafeString(str.replace(/\r?\n|\r/g, '<br>'));
    } else {
      return str;
    }
  });

  // Date and time ------------------------------------------------------------
  Handlebars.registerHelper('formatDateTime', function(datetime, format) {
    if (datetime) {
      return moment(datetime).format(format);
    }
    return '';
  });

  Handlebars.registerHelper('fromNow', function(datetime) {
    if (datetime) {
      return moment(datetime).fromNow();
    }
    return '';
  });

  // Iteration ----------------------------------------------------------------
  Handlebars.registerHelper('times', function(n, options) {
    var accum = '', i;
    for(i = 0; i < n; ++i){
      accum += options.fn(i);
    }
    return accum;
  });

  Handlebars.registerHelper('range', function(from, to, options) {
    // Range is INCLUSIVE of the ends. Useful for things like
    // pagination links.
    var accum = '', i;
    for(i = from; i <= to; i++){
      accum += options.fn(i);
    }
    return accum;
  });

  // HTML ---------------------------------------------------------------------
  Handlebars.registerHelper('select', function(value, options) {
    var $el = $('<div/>').html(options.fn(this)),
      selectValue = function(v) {
        $el.find('[value="'+v+'"]').attr({
          checked: 'checked',
          selected: 'selected'
        });
      };

    if ($.isArray(value)) {
      jQuery.each(value, function(i, v) {
        selectValue(v);
      });
    } else {
      selectValue(value);
    }

    return $el.html();
  });

}(jQuery));