Adobe AIR Development

[RapsFan]

I created a save button and added an eventlistener to run the saveAs() when the button is clicked but I'm getting

Error #1063: Argument count mismatch on views::TxtView/saveAs(). Expected 0, got 1.

I haven't supplied any arguments.

In my init()
...

var saveAsFileBtn:IconButton = new IconButton();
saveAsFileBtn.setIcon("../icons/saveas.png");
saveAsFileBtn.width=100;
saveAsFileBtn.x=saveFileBtn.width+71;
saveAsFileBtn.sizeMode = SizeMode.BOTH;
saveAsFileBtn.sizeUnit = SizeUnit.PIXELS
saveAsFileBtn.addEventListener(MouseEvent.CLICK, saveAs);

...

then

private function saveAs():void
{
trace("Save as");
var fileChooser:File;
if (currentFile)
{
fileChooser = currentFile;
}
else
{
fileChooser = File.documentsDirectory.resolvePath('untitled.html')
}
fileChooser.browseForSave("Save As");
fileChooser.addEventListener(Event.SELECT, saveAsFileSelected);
}

The debugger stops when the Save As button is clicked. When I use regular spark buttons I have no problem.

[peter9477 · Accepted solution]

All event handlers will get at least the event object, so you'd have to define it as

function saveAs(e:Event):void

even if you plan to ignore the object.

[JRab]

Hey RapsFan,

Since you are calling the function as a listener on an event, its sending in the event as an argument into the function. so its almost invisible but it is being sent. Your workaround is to make a listener function that calls that save as function or just turn the save as function into a listener function like so:

private function saveAs(e:MouseEvent):void 
{
     trace("Save as");
     var fileChooser:File;
     if (currentFile)
     {
          fileChooser = currentFile;
     }
     else
     {
          fileChooser = File.documentsDirectory.resolvePath('untitled.html')
     }

     fileChooser.browseForSave("Save As");
     fileChooser.addEventListener(Event.SELECT, saveAsFileSelected);
}

 good luck!

[RapsFan]

Thanks guys. Some things seem so obvious after someone else points them out

[peter9477]

JRab mentions a good solution (wrapper function) if you need to call saveAs() from somewhere else "manually", where there would be no event.

Another option is to specify the event but give it a default of "= null", since you're ignoring it anyway. That effectively makes the event an optional parameter and you can safely use it as a listener or call it from elsewhere without having to fake the event.

[RapsFan]

Excellent point peter and JRab. I am calling it manually as well so I'm going to use the wrapper idea, only because I don't know how to set an event as null. Can you give an example peter?

[RapsFan]

Ahh now I see. You can actually pass null as a parameter in place of an event!