JavaScript `onscroll` event standalone (without frameworks)

Question

I need a standalone JavaScript onscroll event handler (without frameworks such as jQuery, Prototype, mootools, etc.), which is also cross browser.

I have searched for one, I can only find thousands of examples using jQuery or Prototype.

Answer 1

From element.addEventListener:

    function onScrollEventHandler(ev)
    {
        alert(ev);
        //http://dev.w3.org/2006/webapi/DOM-Level-3-Events/html/DOM3-Events.html#event-type-scroll
    } 

    var el=window;

    if(el.addEventListener)
        el.addEventListener('scroll', onScrollEventHandler, false);   
    else if (el.attachEvent)
        el.attachEvent('onscroll', onScrollEventHandler); 

Answer 2

See it on MDN:

https://developer.mozilla.org/en/DOM/window.onscroll

window.onscroll = function (e) {
  // called when the window is scrolled.
}