Scaffold for a jQuery plugin.

jquery.plugin.js

(function($) {
  function Plugin($el, opts) {
    this.$el = $el;

    this.settings = $.extend({
      // Add default settings here.
    }, opts);
  }

  Plugin.prototype = {
    _run: function(name, args) {
      if (typeof this[name] === "function") {
        return this[name].apply(this, args);
      }
      else {
        throw "$.fn.plugin does not have a function called " + name;
      }
    }
  };

  $.fn.plugin = function() {
    var args = Array.prototype.slice.call(arguments); 

    for (var i = 0; i < this.length; i++) {
      var $this = $(this[i]);

      if (!$this.is('element')) {
        throw "$.fn.plugin can only be called on element elements";
      }

      if ($this.data('plugin')) {
        return $this.data('plugin')._run(args.shift(), args);
      }
      else {
        $this.data('plugin', new Plugin($this, args[0]));
      }
    });

    return this;
  };
})(jQuery);