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Handling Unsupported Browsers
What happens if the user’s browser doesn’t support the ExternalInterface class? Flash offers an available property with a Boolean value that can be used to check whether the class is available before you execute the code. This is also a good time to display a message, if the users’ browser doesn’t support the class. The following code is used in the sample to handle these situations:
if(ExternalInterface.available)
{
this.message._visible = false;
ExternalInterface.addCallback("highlightItem", this, highlightItem);
ExternalInterface.addCallback("addAllItems", this, addAllItems);
ExternalInterface.call("onFlashLoaded");
}
This code checks for the availability of the class; if it’s not supported, the code is never executed, and the message that displays the requirements is left visible to inform the user of the issue.