This one holds the grades for the second semester. To switch from one semester to another, we will be
using a ComboBox.
1. Place a ComboBox above the DataGrid. Set the Data provider for the ComboBox to {semester}
(Figure 10-40). This is a variable that we created in the ActionScript that holds the names of the
two XML files. Set Selected index to 0; this makes the ComboBox start with the first option
selected. Set Enabled to true.
Figure 10-40. ComboBox properties
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2. To make it respond, enter updateData(event) for the close event (Figure 10-41). You can find
the updateData event in the Category view of the Flex properties for the ComboBox in the
Events folder.
Figure 10-41. ComboBox event properties
Summary
The charts in Flex are a powerful tool that you can use to present data in a dynamic and compelling way.
We looked at two major ways of modifying the look of the charts: using CSS and adding fills directly to
the MXML.
The charts can be animated through interpolate, zoom, or slide, and labels can be modified to better
represent a chart. In the next chapter, we??™ll look at forms, data validation, and the Accordion component.
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EXPLORING FLEX CHARTING
What we??™ll cover in this chapter:
Accordion component
Data validation
Files used in this chapter:
CH11-WillFlexForFood.zip
One of the real strengths of Flex is the ease of form creation. Forms are a common
technique in web design when you want to get a lot of information from the user.
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