The best use case is to embed the function in your script, and assign the result to some internal variable. The default case is to add cbef.addEvent and cbef.removeEvent to the window object.
An example of how I recommend you use it is:
(function() {
var util = {};
util.events = (function() {
// put the cbef code here
}());
// your script is here
}());
| window.cbef = (function() { | |
| // written by Dean Edwards, 2005 | |
| // with input from Tino Zijdel - crisp@xs4all.nl | |
| // with input from Carl Sverre - mail@carlsverre.com | |
| // http://dean.edwards.name/weblog/2005/10/add-event/ | |
| var exports = {} | |
| , cbefHandlerStr = "__cbefHandler" | |
| , handleEventStr = "__handleEvent"; | |
| // oldSchool is optional, if it is true then we won't use addEventListener | |
| exports.addEvent = function(element, type, handler, oldSchool) { | |
| if (element.addEventListener && !oldSchool) { | |
| element.addEventListener(type, handler, false); | |
| } else { | |
| if (!handler.$$guid) { handler.$$guid = exports.addEvent.guid++; } | |
| if (!element.events) { element.events = {}; } | |
| var handlers = element.events[type] | |
| , ontype = 'on' + type; | |
| if (!handlers) { handlers = element.events[type] = {}; } | |
| if (element[ontype] && !element[ontype][cbefHandlerStr]) { | |
| handlers[exports.addEvent.guid++] = element[ontype]; | |
| element[ontype] = makeHandler(element); | |
| } else if (!element[ontype]) { | |
| element[ontype] = makeHandler(element); | |
| } | |
| handlers[handler.$$guid] = handler; | |
| } | |
| }; | |
| exports.addEvent.guid = 1; | |
| // oldSchool is optional, if it is true then we won't use addEventListener | |
| exports.removeEvent = function(element, type, handler, oldSchool) { | |
| if (element.removeEventListener && !oldSchool) { | |
| element.removeEventListener(type, handler, false); | |
| } else if (element.events && element.events[type] && handler.$$guid) { | |
| delete element.events[type][handler.$$guid]; | |
| } | |
| }; | |
| // ensure handleEvent is called with the element as the context | |
| function makeHandler(element) { | |
| element[handleEventStr] = handleEvent; | |
| var func = function(e) { return element[handleEventStr](e); }; | |
| func[cbefHandlerStr] = true; | |
| return func; | |
| }; | |
| function handleEvent(event) { | |
| event = event || fixEvent(window.event); | |
| var returnValue = true; | |
| var handlers = this.events[event.type]; | |
| for (var i in handlers) { | |
| if (!Object.prototype[i]) { | |
| this.$$handler = handlers[i]; | |
| if (this.$$handler(event) === false) { returnValue = false; } | |
| } | |
| } | |
| if (this.$$handler) { this.$$handler = null; } | |
| return returnValue; | |
| }; | |
| function fixEvent(event) { | |
| event.preventDefault = fixEvent.preventDefault; | |
| event.stopPropagation = fixEvent.stopPropagation; | |
| return event; | |
| }; | |
| fixEvent.preventDefault = function() { | |
| this.returnValue = false; | |
| }; | |
| fixEvent.stopPropagation = function() { | |
| this.cancelBubble = true; | |
| }; | |
| // This little snippet fixes the problem that the onload attribute on the body-element will overwrite | |
| // previous attached events on the window object for the onload event | |
| document.onreadystatechange = function() { | |
| if (window.onload && !window.onload[cbefHandlerStr]) { | |
| exports.addEvent(window, 'load', window.onload, true); | |
| } | |
| } | |
| return exports; | |
| }()); |
| <html> | |
| <head> | |
| <script src="framework.js"></script> | |
| <script> | |
| function loaded () { | |
| console.log("in your base, screwing you up"); | |
| }; | |
| cbef.addEvent(window, "load", function() { | |
| console.log("should fire on load"); | |
| }, true); | |
| </script> | |
| </head> | |
| <body onload="loaded()" bgcolor="white"> | |
| <div id="button" style="background-color: #ccc; width: 100px; height: 100px;">Click Me!</div> | |
| <script> | |
| function clickTest (e) { | |
| console.log("clicked button oldschool"); | |
| }; | |
| var button = document.getElementById("button"); | |
| cbef.addEvent(button, "click", function() { | |
| console.log("clicked button"); | |
| }); | |
| cbef.addEvent(button, "click", clickTest, true); | |
| cbef.addEvent(window, "load", function() { | |
| console.log("should also fire on load"); | |
| }, true); | |
| </script> | |
| </body> | |
| </html> |