How to control .swf with javascript

JavaScript is a powerful scripting language capable of controlling many different media, including Flash .SWF files. SWF file is a vector graphics file format with a high degree of interactivity and animation effects. How to control this file format? This article will explore how to use JavaScript to control .SWF files.

First of all, it should be noted that the Flash file itself has a certain degree of interactivity and can respond to the user's mouse events, keyboard events, etc. These interactivity can be encoded in the Flash file itself. If you just want to simply control the play, stop, pause, etc. functions of Flash files, you can use a tool such as Adobe Flash Professional to create them and control them through JavaScript.

If you want to access more advanced interactive features provided by the Flash file itself, you can use JavaScript. Here, we'll introduce two ways to control .SWF files with JavaScript.

Method 1: Use a JavaScript library

A JavaScript library is a reusable set of code designed to reduce the effort of writing repetitive code for a specific task. There are many JavaScript libraries available today, the most popular of which are jQuery and SwfObject.

It’s very easy to control .SWF files using jQuery. First, load the jQuery library in the page, as shown below:

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>

Then, use the following commands in the JS code to obtain the Flash object and control its playback, stop and other functions:

var flash = $("object");
flash.stop();    //停止Flash动画
flash.play();    //播放Flash动画
flash.pause();   //暂停Flash动画

Using SwfObject can easily embed Flash files into web pages and provide a set of APIs to control it. First, you also need to introduce the SwfObject library on the page:

<script src="https://ajax.googleapis.com/ajax/libs/swfobject/2.2/swfobject.js"></script>

Then, use the following code to initialize the Flash file:

var flashvars = {
    //传递给Flash文件的参数
};
var params = {
    //Flash文件播放时的一些参数
};
var attributes = {
    //定义Flash文件的属性
};
swfobject.embedSWF("demo.swf", "flashcontainer", "300", "200", "10", null, flashvars, params, attributes);

Among them, the first parameter is the URL of the Flash file, and the second The parameter is the ID of the container, the third and fourth parameters are the width and height of the container respectively, and the fifth parameter is the Flash file version, which can be null. Other parameters can be defined as needed.

Use the following code to control Flash files:

var flash = swfobject.getObjectById("flashcontainer");
flash.stop();    //停止Flash动画
flash.play();    //播放Flash动画
flash.pause();   //暂停Flash动画

Method 2: Use ActionScript

ActionScript is a programming language on the Flash platform that can be encoded in Flash files . If you want to use JavaScript to control functionality not provided in the Flash file, you can write ActionScript code and call it through JavaScript.

First, create a new ActionScript file in Flash Professional. Then, write your ActionScript code and save the file.

In JavaScript code, use the following code to load the Flash object and ActionScript file:

var flash = document.getElementById("flashcontainer");   //获取Flash对象
flash.loadMovie("demo.swf");   //加载Flash文件
flash.loadExternalScript("demo.as");   //加载ActionScript文件

Then, in JavaScript, use the following code to call the ActionScript function:

flash.ExternalInterface.call(function_name, arg1, arg2, ...);

where , function_name is the function name you defined in the ActionScript file, and the following parameters are the parameters passed to this function. You can use this method to access advanced interactive functions provided by the Flash platform, such as calling the microphone, camera, etc.

Summary

The above are two methods of using JavaScript to control .SWF files, which can be used to create richer and more interactive web applications. Using these methods, you can access and interact with a large number of features provided by the Flash platform. No matter which method you use, mastering JavaScript and Flash technologies is key.

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