Specifications

233ADOBE FLEX 3

Building and Deploying Adobe Flex 3 Applications

<mx:Script><![CDATA[

private function traceEvent(event:Event):void {

trace(event.currentTarget + ":" + event.type);

}

]]></mx:Script>

<mx:Button id="b1" label="Click Me"

preinitialize="traceEvent(event)"

initialize="traceEvent(event)"

creationComplete="traceEvent(event)"

updateComplete="traceEvent(event)"

</mx:Application>

The following example shows the output of this simple application:

TraceLifecycle_3.b1:Button:preinitialize

TraceLifecycle_3.b1:Button:initialize

TraceLifecycle_3.b1:Button:creationComplete

TraceLifecycle_3.b1:Button:updateComplete

Messages that you log by using the trace() method should be Strings. If the output is not a String, use the

String(...) String conversion function, or use the object’s toString() method, if one is available, before you

call the

trace() method.

To enable tracing, you must configure the debugger version of Flash Player as described in “Configuring the

debugger version of Flash Player to record trace() output” on page 232.

Using the logging API

The logging API lets an application capture and write messages to a target’s configured output. Typically the

output is equivalent to the global

trace() method, but it can be anything that an active target supports.