http://snippets.gfunk007.com/?FindIndex.as
Usage: <?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"; layout="absolute" xmlns:pkg="pkg.*"> <mx:ArrayCollection id="src1"> <mx:Object label="Ken" objid="1"/> <mx:Object label="Ryu" objid="2"/> <mx:Object label="Chun-Li" objid="3"/> <mx:Object label="Dhalsim" objid="4"/> <mx:Object label="E. Honda" objid="5"/> <mx:Object label="Blanka" objid="6"/> <mx:Object label="Zangief" objid="7"/> <mx:Object label="Guile" objid="8"/> </mx:ArrayCollection> <mx:ArrayCollection id="src2"> <mx:Object label="Ken" objid="1"/> <mx:Object label="Ryu" objid="2"/> <mx:Object label="Chun-Li" objid="3"/> <mx:Object label="Dhalsim" objid="4"/> <mx:Object label="E. Honda" objid="5"/> <mx:Object label="Blanka" objid="6"/> <mx:Object label="Zangief" objid="7"/> <mx:Object label="Guile" objid="8"/> </mx:ArrayCollection> <pkg:FindIndex source="{src2}" keyField="objid" searchFor="{ left.selectedItem }" id="fi"/> <mx:HBox horizontalCenter="0" verticalCenter="0"> <mx:List id="left" dataProvider="{src1}" width="120"/> <mx:List id="right" dataProvider="{src2}" selectedIndex="{ fi.matchingIndex }" width="120"/> </mx:HBox> </mx:Application> On Thu, Oct 16, 2008 at 9:02 AM, Josh McDonald <[EMAIL PROTECTED]> wrote: > Why is everybody overriding things like combobox to do this? You could cook > up a util to do it in 15 minutes. > > In fact, I'll be back in 15 minutes. > > > On Thu, Oct 16, 2008 at 8:25 AM, frank_sommers <[EMAIL PROTECTED]>wrote: > >> Thanks for the replies. >> >> Well, Jitendra's solution worked only when I created a ComboBox subclass >> that did take a >> special equals() (based on the value of a property named "id") into >> account. Basically, I >> overrode the selectedItem property in this subclass. >> >> I think equals() and hashCode() are absolutely important, and I find that >> it's a pain that >> Flex doesn't have them: In collection contains() methods, selecting items >> in controls, etc., >> an equals() semantic is really important. There are many duplicate objects >> that are >> semantically equivalent in RIA clients, and without well-defined semantics >> for equality I'm >> finding that I have to implement this sort of logic in components myself. >> >> Any chance that this may be addressed in forthcoming Flex versions? >> >> Thanks, >> >> -- Frank >> >> --- In flexcoders@yahoogroups.com, Maciek Sakrejda <[EMAIL PROTECTED]> wrote: >> > >> > Frank, >> > >> > There's no .equals() in actionscript unless you implement it yourself. >> > Without hearing more about the context, it's hard to tell whether >> > Jitendra's data binding solution would work for this specific problem >> > (data binding would effectively set the list selection to an object that >> > is not in the list--I'm not sure what happens there), but you might run >> > into a need for .equals() further down the line. We did, and since all >> > of our VOs inherit from one VO base object, we just implement .equals() >> > in these as necessary. It seems rather horrifying that there's >> > no .equals() at first, but you don't really need it that often... >> > >> > -- >> > Maciek Sakrejda >> > Truviso, Inc. >> > http://www.truviso.com >> > >> > -----Original Message----- >> > From: frank_sommers <[EMAIL PROTECTED]> >> > Reply-To: flexcoders@yahoogroups.com >> > To: flexcoders@yahoogroups.com >> > Subject: [flexcoders] Java-like equals() method? >> > Date: Sat, 11 Oct 2008 02:54:18 -0000 >> > >> > Hi, >> > >> > I've been searching for a good solution to implementing object equality. >> > I'm familiar with >> > ObjectUtil, etc., but it still makes things harder than they should be. >> > >> > It may be best to illustrate this with an example. Suppose I have a >> > ComboBox with an >> > ArrayCollection as a data provider. The ArrayCollection is populated >> > with value objects >> > from the server, e.g., User objects. Suppose that I have a Task class, >> > and a Task may >> > have an assignedToUser property, which is a User instance. When the >> > someone selects a >> > Task (say, in a master-detail view), I would like the ComboBox to set >> > its selectedItem to >> > the user for the given Task, i.e., combBox.selectedItem = >> > myUser.assignedToUser. >> > >> > The problem is that no Task in the ComboBox's data provider and the >> > User's >> > assignedToUser property are ever equal using the == or === operators. >> > >> > So I would like to implement a custom equality for User, and have the >> > ComboBox use that >> > to set its selectedItem to the specified user. In Java, this is easily >> > done by overriding the >> > equals() and hashCode() methods of User. >> > >> > Any suggestions on how to achieve something similar in Flex would be >> > much appreciated. >> > >> > Thanks, >> > >> > -- Frank >> > >> >> >> >> >> ------------------------------------ >> >> -- >> Flexcoders Mailing List >> FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt >> Alternative FAQ location: >> https://share.acrobat.com/adc/document.do?docid=942dbdc8-e469-446f-b4cf-1e62079f6847 >> Search Archives: >> http://www.mail-archive.com/flexcoders%40yahoogroups.comYahoo! Groups >> Links >> >> >> >> > > > -- > "Therefore, send not to know For whom the bell tolls. It tolls for thee." > > Like the cut of my jib? Check out my Flex blog! > > :: Josh 'G-Funk' McDonald > :: 0437 221 380 :: [EMAIL PROTECTED] > :: http://flex.joshmcdonald.info/ > -- "Therefore, send not to know For whom the bell tolls. It tolls for thee." Like the cut of my jib? Check out my Flex blog! :: Josh 'G-Funk' McDonald :: 0437 221 380 :: [EMAIL PROTECTED] :: http://flex.joshmcdonald.info/
