RE: [flexcoders] Re: dynamically creating children suggestions?

[Matt Chotin]

Crepes are for weekends…   We’ve discussed something with another customer recently along the same lines, I’ve put out a feeler to see if we solved their issue successfully.  In theory I would say that you should be able to solve the problem without resorting to the server (which if you have a lot of clients hitting concurrently with different data coming back will be put under a heavier load because it won’t be able to cache).    Deferred instantiation is probably not taking hold in your case because you’re explicitly calling createChild (I’m guessing).  If you created object descriptors and then instantiated the children using them you could probably do a queued policy that would speed up the responsiveness.  The creation of those object descriptors of course is a little more dicey since I don’t think we document them all that much.   I’ve pinged Alex, let’s see if he comes up with anything…   Matt   From: flexcoders@yahoogroups.com [mailto:flexcoders@yahoogroups.com] On Behalf Of JesterXL Sent: Thursday, July 21, 2005 7:22 PM To: flexcoders@yahoogroups.com Subject: Re: [flexcoders] Re: dynamically creating children suggestions?   Key point here is the server deals with the processor hit, not the client. Secondly, the Flex server has caching built in, and won't compile the XML everytime, even if it changes often. ----- Original Message ----- From: "zhongtie" <[EMAIL PROTECTED]> To: <flexcoders@yahoogroups.com> Sent: Thursday, July 21, 2005 10:10 PM Subject: [flexcoders] Re: dynamically creating children suggestions? That way for each different XML, backend Flex server needs to compile it into a new swf, which, in my experience, has been a not so fast process. Robert's screen is going to hang either way. But frankly, I don't have a solution :( tim --- In flexcoders@yahoogroups.com, "JesterXL" <[EMAIL PROTECTED]> wrote: > If deferred instantation does nothing, and a Repeater doesn't solve your woes, then I'd look to doing some lower level things such as creating your own UIObjectDescriptors, and staggering the drawing algorithm to only process a certain amount of children to create per frame. > > Stepping back, why not have a server side process generate the MXML (since it's just XML to begin with and you are merely changign the format), have the server-side component (CF/Java) write out the MXML, and then use a Loader to hit the MXML file? > > 10 billion more ideas.... of course, Matt'll put the smack down when he finishes his tea and crepes. > > ----- Original Message ----- > From: Robert Brueckmann > To: flexcoders@yahoogroups.com > Sent: Thursday, July 21, 2005 6:10 PM > Subject: [flexcoders] dynamically creating children suggestions? > > > I'm getting XML back from the database.  The XML contains a bunch of elements, all containing children elements that tell me what type of component to display, i.e.: > > > > . > > <FILTERSORT> > >       <EFL_NAME>ASSETS</EFL_NAME> > >       <EFL_DESC>Assets</EFL_DESC> > >       <EFL_SORT>Y</EFL_SORT> > >       <EFL_FILTER>Y</EFL_FILTER> > >       <PRM_TYPE_ID>2</PRM_TYPE_ID> > >       <PRM_TYPE_NAME>NUMBER</PRM_TYPE_NAME> > >       <PUI_ID>3</PUI_ID> > >       <PUI_TYPE>MULTILIST</PUI_TYPE> > >       <FILTERSORTVALUELIST> > >         <PRM EFL_VALUE=" " FFL_DESC=" " EFL_SEQ="0"></PRM> > >         <PRM EFL_VALUE="1" FFL_DESC="Cash and Equivalents" EFL_SEQ="2"></PRM> > >         <PRM EFL_VALUE="50" FFL_DESC="Equities" EFL_SEQ="3"></PRM> > >         <PRM EFL_VALUE="10" FFL_DESC="Fixed Income" EFL_SEQ="4"></PRM> > >         <PRM EFL_VALUE="65" FFL_DESC="Futures" EFL_SEQ="5"></PRM> > >         <PRM EFL_VALUE="99" FFL_DESC="Indices" EFL_SEQ="6"></PRM> > >         <PRM EFL_VALUE="60" FFL_DESC="Options" EFL_SEQ="7"></PRM> > >         <PRM EFL_VALUE="95" FFL_DESC="Private Placements" EFL_SEQ="8"></PRM> > >         <PRM EFL_VALUE="75" FFL_DESC="Rights and Warrants" EFL_SEQ="9"></PRM> > >         <PRM EFL_VALUE="70" FFL_DESC="Swaps" EFL_SEQ="10"></PRM> > >       </FILTERSORTVALUELIST> > > </FILTERSORT> > > <FILTERSORT> > >       <EFL_NAME>ACCOUNT_NAME</EFL_NAME> > >       <EFL_DESC>Accounts</EFL_DESC> > >       <EFL_SORT>Y</EFL_SORT> > >       <EFL_FILTER>Y</EFL_FILTER> > >       <PRM_TYPE_ID>2</PRM_TYPE_ID> > >       <PRM_TYPE_NAME>STRING</PRM_TYPE_NAME> > >       <PUI_ID>3</PUI_ID> > >       <PUI_TYPE>TEXTFIELD</PUI_TYPE> > > </FILTERSORT> > > . > > > > So my flex app gets this XML chunk, I loop through the XML and based on certain parameters in the example XML above, and in each loop, I call createChild on a Form component I have in my MXML file and I build a form that displays to the user various filters they can set for the report they just selected. > > > > I'm dynamically generating DateFields, Textfields, Lists, and a custom Range component that I created whose MXML file looks like this: > > > > <?xml version="1.0" encoding="utf-8"?> > > <mx:VBox xmlns:mx="http://www.macromedia.com/2003/mxml" width="200" fontWeight="bold"> > > > >           <mx:Script> > >                     <![CDATA[ > >                               public var operator:String = "1"; > > > >                               function updateOperator(e) { > >                                         operator = e.target.selectedItem.data; > >                               } > >                     ]]> > >           </mx:Script> > > > >           <mx:LinkBar width="100%" dataProvider="{rangeStack}" /> > > > >           <mx:ViewStack id="rangeStack" width="100%"> > > > >                     <mx:HBox width="100%" label="comparison"> > > > >                               <mx:ComboBox id="operatorList" change="updateOperator(event);" selectedIndex="0" width="50"> > >                                         <mx:dataProvider> > >                                                   <mx:Array> > > <mx:Object label="&lt;" data="" /> > > <mx:Object label="&lt;=" data="" /> > > <mx:Object label="==" data="" /> > > <mx:Object label="&gt;=" data="" /> > > <mx:Object label="&gt;" data="" /> > >                                                   </mx:Array> > >                                         </mx:dataProvider> > >                               </mx:ComboBox> > > > >                               <mx:TextInput id="compVal" width="100%" /> > > > >                     </mx:HBox> > > > >                     <mx:HBox width="100%" label="range"> > > > >                               <mx:Label text="From:" /> > > > >                               <mx:TextInput id="fromVal" width="100%" /> > > > >                               <mx:Label text="To:" /> > > > >                               <mx:TextInput id="toVal" width="100%" /> > > > >                     </mx:HBox> > > > >           </mx:ViewStack> > > > > </mx:VBox> > > > > > > At any rate.one of the reports the user can select returns XML that contains 104 elements, i.e.: 104 various filters they can set for this report.  Well.needless to say my form takes a long time to generate and the browser hangs while it's being created.  I should mention that when I get the XML from the database and it's sent to my ViewHelper class, I use the XMLObjectOutput utility class to convert the XML to an object.  That part, even for the 104 element XML is SO quick.  It's when the form elements begin to get generated on the fly is where the browser hangs.  (I've tried removing the creation of the elements that require my custom Range form field component and that holds very little bearing on the length of time it takes to dynamically generate my form, as an aside). > > > > Is there a more elegant way to dynamically generate children so it's not so memory-taxing?  Is there a better approach altogether for this dynamic generation of children for my Form component? > > > > Any help is greatly appreciated. > > > > Thanks, > > > > > > Robert L. Brueckmann > > Senior Web Developer > > Merlin Securities, LLC > > 595 Madison Avenue > > New York, NY 10022 > > p: 212.822.4821 > > f: 212.822.4820 > > > > -------------------------------------------------------------------------------- > > This message contains information from Merlin Securities, LLC, or from one of its affiliates, that may be confidential and privileged. If you are not an intended recipient, please refrain from any disclosure, copying, distribution or use of this information and note that such actions are prohibited. If you have received this transmission in error, please notify the sender immediately by telephone or by replying to this transmission. > > Merlin Securities, LLC is a registered broker-dealer. Services offered through Merlin Securities, LLC are not insured by the FDIC or any other Federal Government Agency, are not deposits of or guaranteed by Merlin Securities, LLC and may lose value. 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