Flash ActionScript 3.0 XML Basic Slideshow with Transitions
In this tutorial, Im building up what I started in the Text Array Loader. Basically, I have added the ability to pull in images and also setup the whole slideshow on a Timer event. So every 5 seconds (the time limit can be changed), the next image is loaded from the XML, and when it loads it uses an Alpha Tween from the TweenLite library to fade in. In the next version, I will be adding some sort of dynamic navigation.
Here is a screenshot of the XML File:
This slideshow is based off my prior tutorial: Flash ActionScript 3.0 XML Text Array Loader.
Step 1: Declare Your Variables and Import Classes
This is where I first Import the gs.TweenLite class so that I can use it to tween my images. I also setup my variables here for my timer, my slide number, and my image loader.
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import gs.TweenLite;
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// variables
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var xmlList:XMLList;
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var slideNum:Number = 0;
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var imgLoader:Loader = new Loader();
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var slideTimer:Timer = new Timer(5000); //runs every 5 seconds
Step 2: Load the XML
Now I setup the loader request for XML and once its finished loading using the EventListener, then I tell flash to pull the name attribute out of the first node in my xml file and I use the another instance of the loader class to to load the image out of the xml file. I then place the text in the dynamic text field called imageText and also add the first instance of imgLoader to the stage and tell it to tween in.
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// load xml
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var xml:XML = new XML();
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var loader:URLLoader = new URLLoader();
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loader.load(new URLRequest("images.xml"));
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loader.addEventListener(Event.COMPLETE,
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function(evt:Event):void {
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xml = XML(evt.target.data);
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xmlList = xml.children();
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imageText.text = xml.image[slideNum].@name.toString();
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imgLoader.load(new URLRequest(xml.image[slideNum].@src));
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TweenLite.from(imgLoader, 1, {alpha:0});
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imgLoader.x = 0 ;
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imgLoader.y = 0;
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}
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);
Step 3: Add Event Listeners
Now I setup the imgLoader event listener, that once that event is complete it will run onLoadComplete. I also setup the slideTimer here and start it. The slideTimer is set to call the function onSlideTimer every 5 seconds.
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// stage event listeners
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imgLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, onLoadComplete);
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slideTimer.addEventListener(TimerEvent.TIMER, onSlideTimer);
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slideTimer.start();
Step 4: Change Text Function
I carried over the Change Text Function from my XML Text Array Tutorial and added a few lines to pull the next image from the XML file along with the next text description.
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// this function will change the text depending upon which number is fed to the var slideNum in the onClickNextSlide function
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function changeText(slideNum:Number):void {
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imageText.text = xml.image[slideNum].@name.toString();
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imgLoader.load(new URLRequest(xml.image[slideNum].@src));
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addChild(imgLoader);
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TweenLite.from(imgLoader, 1, {alpha:0});
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imgLoader.x = 0;
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imgLoader.y = 0;
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}
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changeText(0);
Step 5: Timer Function
This is the most crucial part of the slideshow is what makes the slideshow run on its own. This is the timer function which the timer calls every 5 seconds. It will change the slide, so every five seconds its counts up a number and that is the image that is shown. Once it reaches the 5th image(4), it starts over at 0, which is really 1.
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function onSlideTimer(evt:TimerEvent):void {
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if (slideNum == 4) {
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slideNum = 0;
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}
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else {
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slideNum ;
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}
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changeText(slideNum);
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trace(slideNum);
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}
Step 6: onLoadComplete Function
This function adds the imgLoader to the stage, without this you will not see anything in your movie. This is crucial!
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function onLoadComplete(event:Event):void {
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addChild(imgLoader);
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}
Im currently working on making this a tad more dynamic with buttons, and a slideLength variables which automatically changes the amount of slides so that you dont have to change the .fla file when adding more nodes to your slideshow. Im also going to be working on getting slicker transitions working such as images that slide in/slide out off the screen.
Here is an example of the working file:
View Demo
Download all the source files here: AS3 Basic Slideshow with Transitions (1082)
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Next, I setup my AS3 file. I opened a new AS3 document, and created two movieclips and gave them instance names of prevBtn and nextBtn. I didnt setup my code in OOP, that will be part of the next tutorial. I just wanted to do something basic here to help people get started. I also added a dynamic text field to the stage and gave it an instance name of "imageText".