Flex中如何在Tree控件中指定一个自定义的label函数使其返回的标签名字为叶项目的名称的例子

<iframe src="http://blog.minidx.com/ext05/defining-a-custom-label-function-on-a-flex-tree-control/main.html" width="550" height="380"></iframe>

1. <?xml version="1.0" encoding="utf-8"?>
2. <mx:Applicationxmlns:mx="http://www.adobe.com/2006/mxml"
3. layout="vertical"
4. verticalAlign="middle"
5. backgroundColor="white">
7. <mx:Script>
8. <![CDATA[
9. private function tree_labelFunc(item:XML):String {
10. var label:String;
11. switch (item.localName()) {
12. case "league":
13. label = item.@title;
14. break;
15. case "team":
16. label = item.@name;
17. break;
18. case "stadium":
19. label = item.name;
20. }
21. return label;
22. }
23. ]]>
24. </mx:Script>
26. <mx:XMLid="mlb" source="mlb.xml" />
28. <mx:Treeid="tree"
29. dataProvider="{mlb.league}"
30. labelFunction="tree_labelFunc"
31. width="300"
32. rowCount="8"/>
34. </mx:Application>

下面是

Download: mlb.xml

1. <?xml version="1.0" encoding="utf-8"?>
2. <mlb>
3. <leagueid="al" title="American League">
4. <teamname="Baltimore Orioles" />
5. <teamname="Boston Red Sox" />
6. <teamname="Chicago White Sox" />
7. <teamname="Cleveland Indians" />
8. <teamname="Detroit Tigers" />
9. <teamname="Kansas City Royals" />
10. <teamname="Los Angeles Angels of Anaheim" />
11. <teamname="Minnesota Twins" />
12. <teamname="New York Yankees" />
13. <teamname="Oakland Athletics" />
14. <teamname="Seattle Mariners" />
15. <teamname="Tampa Bay Devil Rays" />
16. <teamname="Texas Rangers" />
17. <teamname="Toronto Blue Jays" />
18. </league>
19. <leagueid="nl" title="National League">
20. <teamname="Arizona Diamondbacks" />
21. <teamname="Atlanta Braves" />
22. <teamname="Chicago Cubs" />
23. <teamname="Cincinnati Reds" />
24. <teamname="Colorado Rockies" />
25. <teamname="Florida Marlins" />
26. <teamname="Houston Astros" />
27. <teamname="Los Angeles Dodgers" />
28. <teamname="Milwaukee Brewers" />
29. <teamname="New York Mets" />
30. <teamname="Philadelphia Phillies" />
31. <teamname="Pittsburgh Pirates" />
32. <teamname="San Diego Padres" />
33. <teamname="San Francisco Giants" />
34. <teamname="St. Louis Cardinals" />
35. <teamname="Washington Nationals" />
36. </league>
37. </mlb>