Adding event listener on the page
Suppose you have an input field and you need FilerTag function be performed each time user types a character. Below are two approaches for this. Native browser approach: if (a.addEventListener) {a.addEventListener("keyup", FilterTags, false)} // firefox else if (a.attachEvent) {a.attachEvent("onpropertychange", FilterTags)} // ie YUI approach: YAHOO.util.Event.addListener(a, "keyup", FilterTags);