I see nothing wrong with what you're doing. You can certainly use == to compare a var typed as some class against null, so I suspect that the error is caused by something else. - Gordon
________________________________ From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Manish Jethani Sent: Monday, April 23, 2007 10:22 AM To: [email protected] Subject: Re: [flexcoders] Testing if a datatyped variable is not set yet You didn't say what error you're getting when you compare with null (?) On 4/23/07, [EMAIL PROTECTED] <mailto:khair%40nc.rr.com> <[EMAIL PROTECTED] <mailto:khair%40nc.rr.com> > wrote: > I have a class, "Player" that with a "selectPlayer" method. > I want "selectPlayer" to automatically deselect the last selected Player > that stored in > the static variable "LAST_SELECTED". > > It's imperative that I keep LAST_SELECTED data type as "Player". > I don't want give it the dynamic datatype. > > What's a more elegant way to test if LAST_SELECTED is defined without > getting an Error? > > > > Normally in AS2, I would just declare it null in class variables and > later define it when selectPlayer is called like: > > function selectPlayer() > { > if(Player.LAST_SELECTED == null){ > Player.LAST_SELECTED = this; > } > } > > But the testing of "null" causes an Error when a variable's datatype is set. > So I can't use this lazy AS2 tactic anymore. ;) > > [CODE] > > import mx.core.UIComponent; > import mx.controls.Alert; > > class Player extends UIComponent > { > private static var LAST_SELECTED:Player > > public function Player():void > { > /***** > Whenever I create a new Player defining LAST_SELECTED here fixes > the Error > But I purposely don't want each new created Player to be set as > LAST_SELECTED. > ******/ > //I don't want this so I comment it out. > //--->Player.LAST_SELECTED=new Player(); > } > > private function selectPlayer():void > { > try > { > if(Player.LAST_SELECTED != this){ > //Restore the last selected Player to normal scale. > Player.LAST_SELECTED.scaleX=100; > Player.LAST_SELECTED.scaleY=100; > > //Assign this current Instance as the LAST_SELECTED Player. > Player.LAST_SELECTED=this; > > //Set the scale to show the new selected instance . > scaleX=150; > scaleY=150; > } > }catch(e:Error){ > Alert.show(e.message,e.name); > } > } > > } > > [/CODE] > > > Thanks for your time, > --Keith H-- > > > -- > Flexcoders Mailing List > FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt <http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt> > Search Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.com <http://www.mail-archive.com/flexcoders%40yahoogroups.com> > Yahoo! Groups Links > > > > >
