ACTIONSCRIPT 3 Developer’s Guide en

ACTIONSCRIPT 3.0 DEVELOPER’S GUIDE
Handling errors
function showWarningError(error:WarningError):void
{
var message:String = error.message + "\n\n" + "Do you want to exit this application?";
showButtons();
var title:String = error.getTitle();
statusText.text = message;
}
When the user clicks either the Yes or No button, the closeHandler() method is called. The following excerpt shows
the closeHandler() method:
function closeHandler(event:CloseEvent):void
{
switch (event.detail)
{
case yesButton:
showFatalError(new FatalError(9999));
break;
case noButton:
statusText.text = "";
hideButtons();
break;
}
}
If the user chooses to cancel the script by clicking Yes, a FatalError is thrown, causing the application to terminate.
Building a custom validator
Flash Player 9 and later, Adobe AIR 1.0 and later
The custom Validator class contains a single method, validateEmployeeXML(). The validateEmployeeXML()
method takes a single argument, employee, which is the XML packet that you want to validate. The
validateEmployeeXML() method is as follows:
public static function validateEmployeeXML(employee:XML):void
{
// checks for the integrity of items in the XML
if (employee.costCenter.length() < 1)
{
throw new FatalError(9000);
}
if (employee.costCenter.length() > 1)
{
throw new WarningError(9001);
}
if (employee.ssn.length() != 1)
{
throw new FatalError(9002);
}
}
To be validated, an employee must belong to one (and only one) cost center. If the employee doesn’t belong to any cost
centers, the method throws a FatalError, which bubbles up to the validateData() method in the main application
file. If the employee belongs to more than one cost center, a WarningError is thrown. The final check in the XML
validator is that the user has exactly one social security number defined (the ssn node in the XML packet). If there is
not exactly one ssn node, a FatalError error is thrown.
Last updated 6/6/2012
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