指定した時間の範囲外のときに、HTML要素を非表示にしたり、disabledにしたりするjQueryプラグイン

jquery.offdaytime.js

(function($){

  $.fn.offDayTime = function( options ) {
    // Extend settings
    var settings = $.extend({
      behavior  : 'hide',
      openTime  : 900,
      closeTime : 1700,
      closeDays : [0, 6] // 0:Sun, 6:Sat
    }, options);
    // Flag
    var flag = function() {
      // Now time
      var date    = new Date($.now());
      var nowDay  = date.getDay();
      var nowHour = date.getHours().toString();
      var nowMin  = ('00' + date.getMinutes()).slice(-2);
      var nowTime = parseInt(nowHour + nowMin, 10);
      // Day off
      if ($.inArray(nowDay, settings.closeDays) !== -1)
        return false;
      // Time off
      if (nowTime < settings.openTime || nowTime > settings.closeTime)
        return false;
      // Day and Time on !!
      return true;
    }();
    // Core
    return this.each(function() {
      // Escape $(this)
      var element = $(this);

      if (!flag) {
        switch (settings.behavior) {
          case 'hide':
            element.css('display', 'none');
            break;
          case 'disabled':
            element.attr('disabled', true);
            break;
          default:
            element.css('display', 'none');
            break;
        }
      }
    });
  };

}(jQuery));

sample.html

<script src="/path/to/jquery.js"></script>
<script src="/path/to/jquery.offdaytime.js"></script>
<script>
  jQuery(function($) {
    // Default
    $('#foo').offDayTime();
    // Use Options
    $('#bar').offDayTime({
      behavior  : 'disabled',
      openTime  : 1200,
      closeTime : 2000,
      closeDays : [3]
    });
  });
</script>

<p id="foo">Office Hours!</p>
<button id="bar">Send Message</button>