Are you asking how to detect changes in your dataprovider? The answer is yes, sort of. But it really depends on your app and where the data is coming from. IN general, I would say that this is application dependent. A very simple code example would help us know how to guide you. Ely.
________________________________ From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of polonycjunk Sent: Thursday, December 07, 2006 7:12 AM To: [email protected] Subject: [flexcoders] Re: Dynamic Min/Max for chart axis not updating automatically. Can this be done? --- In [email protected] <mailto:flexcoders%40yahoogroups.com> , "polonycjunk" <[EMAIL PROTECTED]> wrote: > > Hi Ely, > > Sorry if I confused you. If I let flex handle the min/max value, I am > not getting the time axis I'm looking. Say for example, the current > time is 4:01:00. Consider a collection with size = 60. It consists > of data for the last 60 seconds. If I let flex handle it, the h-axis > will only show 4:00:00 to 4:01:00. But what I really want is for the > h-axis to show the time from 4:00:00(min) to 4:03:00 (max) > (T+3minutes). As more data arrives each second, I want the min and > max to change to reflect the times that are in the collection. > > Once I assign a min/max to the chart, is there a way to update it > according to new values in the dataProvider? > > The only way I was able to make it change was if I created a button > which sets a new Min/Max. I would need to consistently click on the > button to create the moving window of (T + 3). > > > --- In [email protected] <mailto:flexcoders%40yahoogroups.com> , "Ely Greenfield" <egreenfi@> wrote: > > > > > > > > I'm a little confused by your question. If you're explicitly assigning a > > min/max value, you're telling the chart you don't want it to generate > > automatic min/max values. If you're asking how to remove your > > previously assigned min/max and ask it to restart automatically > > generating min/max values, just set the min/max of the axis to > > undefined. > > > > Ely. > > > > > > ________________________________ > > > > From: [email protected] <mailto:flexcoders%40yahoogroups.com> [mailto:[email protected] <mailto:flexcoders%40yahoogroups.com> ] On > > Behalf Of polonycjunk > > Sent: Wednesday, December 06, 2006 9:42 AM > > To: [email protected] <mailto:flexcoders%40yahoogroups.com> > > Subject: [flexcoders] Dynamic Min/Max for chart axis not updating > > automatically. > > > > > > > > Once a minimum/maximum value is assigned to the DateTimeAxis, how can > > i get a realtime chart to update the min/max values depending on its > > dataProvider and keep it updating? > > > > Here is some code to illustrate: > > Note: dataProvider is an ArrayCollection of size 100. if size = 100, > > the date at index 0 is removed and the next date is added. > > > > private var _minimum:Date=null; > > [Bindable] > > public function get minimum():Date{ > > if(this.dataProvider == null){ > > _minimum = new Date(); > > _minimum.setHours(9,0,0,0); > > }else{ > > _minimum = this.dataProvider.getItemAt(0).date; > > > > } > > return _minimum; > > } > > > > private var _maximum:Date=null; > > [Bindable] > > public function get maximum():Date{ > > if(this.dataProvider == null){ > > _maximum = new Date(); > > _maximum.setHours(16,0,0,0); > > }else{ > > if(_zoomLevel == "seconds"){ > > _maximum.setHours(_minimum.hours, _minimum.minutes +3, > > _minimum.seconds,_minimum.milliseconds); //I want my maximum to > > change whenever my minimum changes. > > } > > } > > return _maximum; > > } > > > > MXML code: > > > > <mx:horizontalAxis> > > <mx:DateTimeAxis id="hTimeAxis" labelUnits="minutes" > > dataUnits="minutes" interval="20" displayLocalTime="true" > > alignLabelsToUnits="true" minimum="{minimum}" maximum="{maximum}" /> > > </mx:horizontalAxis> > > >
