Data Charts and Radio Buttons

Question

Hello,
I'm new to flex and need some help with a project of mine. I
want to be able to take a poll (using Radio Buttons) and create
from that info a chart. I've tried everything I know how, but I
can't get it to work. I know I need a dataprovider tag somewhere
but how to create the data from that poll to create the model and
the data provider? Any help would be great.
Thanks,
Olsen

Answer 1

A dataProvider for a chart (or list) is based on one of the
Collection classes, usually ArrayCollection. So if you want to
create a chart of say the number of people who responded to a
question broken down by their ages, you might have a table like
this:
Age Response
18 a
22 b
23 a
18 b
etc.
That tells me you want use an ArrayCollection:
[Bindable] private var chartData:ArrayCollection;
chartData = new ArrayCollection();
chartData.addItem( { age:18, value:"a"} );
chartData.addItem( {age:22, value:"b"} );
etc.
Now you have an ArrayCollection of Objects, each of which has
an age property and a value property. Now you can apply this to a
chart:
<mx:ColumnChart dataProvider="{chartData}"... >
<mx:series>
<mx:ColumnSeries yField="value" />
</mx:series>
<mx:horizontalAxis><mx:CategoryAxis
categoryField="age" dataProvider="{chartData}"
/></mx:horizontalAxis>
</mx:ColumnChart>
You can define the chart in MXML and modify or create the
data in ActionScript.