MACROMEDIA FLASH 8-LEARNING ACTIONSCRIPT 2.0 IN FLASH - Page 772

772 Best Practices and Coding Conventions for ActionScript 2.0
About using listener syntax
You can write listeners for events in several ways in Flash 8. Some popular techniques are
shown in the following code examples. The first example shows a properly formatted listener
syntax, which uses a Loader component to load content into a SWF file. The
progress event
starts when content loads, and the
complete event indicates when loading finishes.
var boxLdr:mx.controls.Loader;
var ldrListener:Object = new Object();
ldrListener.progress = function(evt:Object) {
trace("loader loading:" + Math.round(evt.target.percentLoaded) + "%");
};
ldrListener.complete = function(evt:Object) {
trace("loader complete:" + evt.target._name);
};
boxLdr.addEventListener("progress", ldrListener);
boxLdr.addEventListener("complete", ldrListener);
boxLdr.load("http://www.helpexamples.com/flash/images/image1.jpg");
A slight variation on the first example in this section is to use the handleEvent method, but
this technique is slightly more cumbersome. Macromedia does not recommend this technique
because you must use a series of
if..else statements or a switch statement to detect which
event is caught.
var boxLdr:mx.controls.Loader;
var ldrListener:Object = new Object();
ldrListener.handleEvent = function(evt:Object) {
switch (evt.type) {
case "progress" :
trace("loader loading:" + Math.round(evt.target.percentLoaded) + "%");
break;
case "complete" :
trace("loader complete:" + evt.target._name);
break;
}
};
boxLdr.addEventListener("progress", ldrListener);
boxLdr.addEventListener("complete", ldrListener);
boxLdr.load("http://www.helpexamples.com/flash/images/image1.jpg");