Flex中如何利用FocusManager类的setFocus函数，设置TextInput的焦点

main.mxml

1. <?xml version="1.0" encoding="utf-8"?>
2. <mx:Applicationname="FocusManager_setFocus_test"
3. xmlns:mx="http://www.adobe.com/2006/mxml"
4. layout="vertical"
5. verticalAlign="middle"
6. backgroundColor="white">
8. <mx:Script>
9. <![CDATA[
10. import mx.controls.Alert;
12. private function submitButton_click(evt:MouseEvent):void {
13. Alert.show(evt.currentTarget.label,
14. Object(focusManager.getFocus()).name);
15. }
17. private function resetButton_click(evt:MouseEvent):void {
18. username.text = "";
19. password.text = "";
20. Alert.show(evt.currentTarget.label,
21. Object(focusManager.getFocus()).name);
22. }
23. ]]>
24. </mx:Script>
26. <mx:ApplicationControlBardock="true">
27. <mx:Buttonlabel="Set focus to Username"
28. click="focusManager.setFocus(username);"/>
29. <mx:Buttonlabel="Set focus to Password"
30. click="focusManager.setFocus(password);"/>
31. </mx:ApplicationControlBar>
33. <mx:Formid="form"
34. defaultButton="{submitButton}">
35. <mx:FormItemlabel="Username:">
36. <mx:TextInputid="username" />
37. </mx:FormItem>
38. <mx:FormItemlabel="Password:">
39. <mx:TextInputid="password"
40. displayAsPassword="true"/>
41. </mx:FormItem>
42. <mx:FormItemdirection="horizontal"
43. horizontalAlign="right"
44. width="100%">
45. <mx:Buttonid="submitButton"
46. label="Submit"
47. click="submitButton_click(event);"/>
48. <mx:Buttonid="resetButton"
49. label="Reset"
50. click="resetButton_click(event);"/>
51. </mx:FormItem>
52. </mx:Form>
54. </mx:Application>