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Passing Variables into a Flash Movie

Many of web developers know the advantages of using Flash to make animations or small applications which work on web. Honestly, there is an infinite number of things you can do.

Let's say you've developed a nice Flash movie, which also needs some variables to work properly. You declare these obviously inside the movie and work with them there. We say the Flash object is a boundary - outer elements don't have access to its variables.

But what if you want to import some values when a page is being loaded, through a URL address? There is a way how to do it using SWFObject, a feature of JavaScript. You can choose whether the values will be static (i.e. set in JavaScript code) or dynamic (assigned to variables through URL).


For this example, please view:

Placing a SWF object requires some more code than creating an ordinary <object> tag containing a Flash movie. In our HTML document, we should have:

<div id="flashcontent"> This text is shown when client hasn't appropriate version of Flash Player installed.


<script type="text/javascript"> // <![CDATA[

<script type="text/javascript"> // <![CDATA[

Please note that to specify a value as a constant I used: so.addVariable("[variable name]","[value]");

On the other hand, if we want to be able to specify a value through URL, we use: so.addVariable("[variable name]", getQueryParamValue("[name of variable in URL]"));

For example, to set a name on the rug: so.addVariable("company",getQueryParamValue("company"));

While in Flash we have: rugLabel.text = _root.company;

URL would be:


It a good practice to specify default values, i.e. what all variables will contain if a HTML page is called without any parameters. In the Flash movie, we have a variable called treelights which when set to 1, blinking lights are shown on the Christmas tree. In the first frame of root, we can write:

if (_root.treeLights == null) { _root.treeLights = 1; }

Which means "display lights if no other value is set".

To check a String, the code would be: if (_root.company.length<=0) { _root. company = "Your company"; }

Furthermore, to specify more variables in the URL, we add them with &amp;, i.e.:


Of course, passing data this way is quite insecure because everyone can see the content of URL. However, this is still a great way how to customize your Flash advertisements, e-cards or applications. It also gives your customers option to change content and functionality without having to upload new flash movie.

To download the source code, please follow this link:


About the author:

Visit Lenka at http://webdesignerfreelancer.com.

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