/**

 * This class allows you to assign an eventListener to be utilzed only once, before

 * it removes itself.

 */

var SingleEvent = function (elem, eventName, callback) { "use strict";

  var singleuse;

  if (typeof elem === "object" && elem.tagName) {

    singleuse = function() {

        callback.apply();

        elem.removeEventListener(eventName, singleuse, false);

    };

    elem.addEventListener(eventName, singleuse, false);

  }

};

​

​

var elem = document.createElement('div');

var onetimer = new SingleEvent(elem, "click", function(){alert("Well, I'll never do THAT again...");});

document.body.appendChild(elem);