Friendlier Flash: Creating a Flash Preloader

Why Preloaders Matter for Flash Sites

Flash has become a staple on many web pages, offering rich animation and interactivity that static images cannot match. Yet, the very features that make Flash attractive can also become a bottleneck. Even after compression, a typical Flash movie can reach several megabytes, which is still a hefty download for users on slower connections. In an era where many visitors still rely on dial‑up or early broadband, long load times translate into frustration and abandonment.

One simple solution is to give users a choice. A “Skip Movie” link at the top of the page lets impatient visitors bypass the introduction and jump straight to the content they care about. This approach acknowledges that not every visitor is willing to wait for an animation to finish, and it improves overall user satisfaction. Many designers already add this link, but its effectiveness depends on placing it in a clear, visible spot.

Even with a skip link, the remaining visitors who decide to watch the animation often encounter a different problem: choppiness. Flash streams video data as it plays, so any hiccup in the network - whether a burst of traffic, a temporary outage, or simply a slow line - can cause the animation to pause or stutter. The result is a jarring experience that can turn away users who might otherwise stay on the site.

Preloaders mitigate this risk by ensuring that enough of the Flash movie is downloaded before playback begins. The preloader checks for the presence of a specific frame (or group of frames) and only starts the animation once that portion is fully available. This technique smooths the playback experience, reduces the likelihood of pauses, and keeps the page feeling responsive.

Another advantage of a preloader is that it lets designers control how long a visitor waits before the animation starts. If the movie is short, you might choose to load the entire file before playback. For longer cartoons, loading half the file is often sufficient; the rest can stream behind the scenes while the animation progresses. By tailoring the preloading threshold to the length and complexity of the content, you strike a balance between performance and visual quality.

Creating a preloader also signals to users that the site is handling their bandwidth constraints responsibly. When visitors notice that an animation starts smoothly and without hiccups, they are more likely to explore the rest of the site. On the flip side, a jarring start can cause a user to navigate away before they even get a chance to see what you’re offering.

The preloader mechanism relies on three keyframes: a test frame that checks whether a target frame has loaded, a loop frame that returns to the test frame if the target is not yet ready, and a play frame that begins the animation. The code behind these frames is lightweight and can be added directly in the Flash timeline. Even users with limited ActionScript experience can implement this pattern with a few lines of code.

Because the preloader operates entirely inside the Flash movie, it does not require any server‑side changes or extra plugins. This means that adding a preloader to an existing site is a quick, low‑cost improvement that can be deployed with minimal effort. Once the preloader is in place, the rest of the page can load normally, and the animation will start only when it is safe to do so.

In short, a well‑designed preloader protects the user experience on slow connections, smooths animation playback, and demonstrates respect for visitors’ bandwidth. These benefits combine to create a more welcoming environment for all users, regardless of their internet speed.

Building a Simple Preloader in Flash 5

Creating a preloader in Flash 5 is straightforward once you understand the basic timeline structure. Begin by adding three new keyframes to the same layer as your movie, placing them just before the first frame of the animation. Label these keyframes for clarity: TestFrame, LoopFrame, and PlayMovie. A fourth keyframe, LoadFrame, should be placed at the point where you want playback to start - often the middle or end of the movie.

To label a keyframe, double‑click it to open the Frame panel, type the label into the Label field, and press OK. You can also add descriptive comments in the layer name to remind yourself of each frame’s purpose. For example, the layer might be named “Preloader” with sub‑labels in parentheses.

Once the keyframes are in place, add the ActionScript that governs the preloader logic. Select the TestFrame, open the Actions panel, and insert the following code:

This code checks whether the LoadFrame has finished downloading. If it has, the playhead jumps directly to the PlayMovie frame and starts the animation. If it has not, the playhead continues to the LoopFrame.

Now select the LoopFrame and add a single line of ActionScript that returns the playhead to TestFrame:

With this loop in place, the movie will continuously cycle through TestFrame and LoopFrame until LoadFrame becomes ready. The loop is light on resources and ensures that playback never starts prematurely.

It’s important to note that the code above assumes the use of Flash 5’s ActionScript 1.0 or 2.0 syntax. In later versions, the syntax changes slightly (e.g., this.getMovieClip("LoadFrame")._loaded), so adjust accordingly if you’re working in Flash CS6 or newer. The core idea remains the same: test for the loaded status, loop until ready, then start playback.