Tracy, can a datagrid read an xml object directly? (Like, an XMLList or XMLListCollection?) If so, why would manually converting it perform better than the original XML? Does it have something to do with the strong typing?
Thanks ~sean On Wed, Jul 2, 2008 at 4:29 PM, Tracy Spratt <[EMAIL PROTECTED]> wrote: > It is a rare case that you want to use mx:Model or the default > resultFormat="object". You take the performance hit for the conversion, you > have no control over the conversion process (your strings that look like > numbers will get converted to numbers, willy nilly) and you wind up with > dynamic objects, which have an access peformance penalty. > > > > I advise using resultFormat="e4x", a result handler function, and an > instance variable to hold the xmlResult. > > > > The best performance, especially in a multi-renderer DataGrid, will be if > you manually convert the XML node data ino an ArrayCollection of strongly > typed value objects. > > > > Tracy > > > ------------------------------ > > *From:* [email protected] [mailto:[EMAIL PROTECTED] *On > Behalf Of *Sean Clark Hess > *Sent:* Wednesday, July 02, 2008 4:05 PM > *To:* [email protected] > *Subject:* Re: [flexcoders] Inspecting data from HTTPService result to an > ArrayCollection > > > > Ah, got it. > > The <mx:Model> tag converts everything to a flat object. So the minute you > use it, you no longer have xml. > > It's still easy enough to loop through though. > > var result:Object = myData.getItemAt(0); > for (var name:String in result) > { > trace(name + " :: " + result[name]); > } > > should output > apple :: 81768 > orange :: 60310 > banana :: 43357 > > On Wed, Jul 2, 2008 at 1:46 PM, Stephen More <[EMAIL PROTECTED]> > wrote: > > Here is my output: > > DEBUG: 2 null > [object Object] > CHECK : false > CHECK : false > > Here is all the code: > <?xml version="1.0"?> > <!-- charts/XMLFileToArrayCollectionDataProvider.mxml --> > <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"; > width="100%" height="100%"> > <mx:Script> > import mx.utils.ArrayUtil; > </mx:Script> > > <mx:Model id="results" source="../assets/data.xml"/> > <mx:ArrayCollection id="myData" > source="{ArrayUtil.toArray(results.result)}" > /> > > <mx:Panel title="Line Chart"> > <mx:LineChart id="chart" dataProvider="{myData}" showDataTips="true"> > <mx:horizontalAxis> > <mx:CategoryAxis categoryField="month"/> > </mx:horizontalAxis> > <mx:series> > <mx:LineSeries yField="banana" displayName="Banana"/> > <mx:LineSeries yField="apple" displayName="Apple"/> > <mx:LineSeries yField="orange" displayName="Orange"/> > </mx:series> > </mx:LineChart> > > <mx:Button id="iconButton" label="Button with Icon" > labelPlacement="right" color="#993300" > click="printMessage(event);"/> > > <mx:Script> > <![CDATA[ > > import flash.events.Event; > > // Event handler function to print a message > // describing the selected Button control. > private function printMessage(event:Event):void { > //message.text += event.target.label + " pressed" + "\n"; > > > > var myXML:XML; > myXML = myData.getItemAt(0) as XML; > > trace( "DEBUG: " + myData.length + " " + myXML ); > trace( myData.getItemAt(0) ); > > > trace("CHECK : " + (myData.getItemAt(0) is XML)); > > trace("CHECK : " + (myData.getItemAt(0) is XMLList)); > } > > ]]> > </mx:Script> > > </mx:Panel> > </mx:Application> > > > > On Wed, Jul 2, 2008 at 3:34 PM, Sean Clark Hess <[EMAIL > PROTECTED]<seanhess%40gmail.com>> > wrote: > > What do you get when you trace myData.getItemAt(0)? That will return null > > if it isn't an XML. You can do this too: > > > > trace("CHECK : " + (myData.getItemAt(0) is XML)); > > > > You can check to see if it is an XMLList too, but I thought looking at > it, > > it seemed like a flat xml. > > > > On Wed, Jul 2, 2008 at 1:32 PM, Stephen More <[EMAIL > > PROTECTED]<stephen.more%40gmail.com>> > wrote: > >> > >> Thats what I was thinking but when I try: > >> > >> var myXML:XML; > >> myXML = myData.getItemAt(0) as XML; > >> trace( "DEBUG: " + myXML ); > >> > >> I get > >> DEBUG: null > >> > >> On Wed, Jul 2, 2008 at 2:30 PM, Sean Clark Hess <[EMAIL > >> PROTECTED]<seanhess%40gmail.com> > > > >> wrote: > >> > Each row is an xml object... > >> > > >> > So, (myData.getItemAt(i) as XML).children() > >> > > >> > Then you could loop through the children and ask them for their name. > >> > After > >> > the as XML step you can do anything you can normally do with the XML > >> > object > >> > > >> > On Wed, Jul 2, 2008 at 12:11 PM, Stephen More <[EMAIL > >> > PROTECTED]<stephen.more%40gmail.com> > > > >> > wrote: > >> >> > >> >> ( Example code taken from: > >> >> http://livedocs.adobe.com/flex/201/html/charts_intro_108_12.html ) > >> >> Here is the dataset I am trying to work with: > >> >> > >> >> <data> > >> >> <result month="Jan-04"> > >> >> <apple>81768</apple> > >> >> <orange>60310</orange> > >> >> <banana>43357</banana> > >> >> </result> > >> >> <result month="Feb-04"> > >> >> <apple>81156</apple> > >> >> <orange>58883</orange> > >> >> <banana>49280</banana> > >> >> </result> > >> >> </data> > >> >> > >> >> The flex code will look like this: > >> >> <mx:HTTPService > >> >> id="srv" > >> >> url="../assets/data.xml" > >> >> useProxy="false" > >> >> result="myData=ArrayCollection(srv.lastResult.data.result)" > >> >> /> > >> >> > >> >> How can I interrogate the ArrayCollection named myData so that it > will > >> >> return apple, orange, and banana ? > >> >> I am not looking to get the numerical values, I want to get the xml > >> >> name. > >> >> > >> >> -Thanks > >> >> Steve More > >> > > >> > > > > > > > > > >
