Four event handling methods of flex4

First, this example is for buttons. In fact, other components are similar.

First: directly write in the click attribute
<S: button label = "Click me" Click = "alert. Show ('clicked! ') "/>

Type 2: Embedded <s: Click> label
<S: button id = "B" label = "Click me once">
<S: Click>
B. Enabled = false;
MX. Controls. Alert. Show ('clicked! ');
</S: Click>
</S: button>
Third: Common Method Processing

<FX: SCRIPT>
<! [CDATA [
Import MX. Controls. Alert;

Private function handleclick (Event: mouseevent): void
{
B. Enabled = false;
MX. Controls. Alert. Show ('clicked! ');
}
]>
</FX: SCRIPT>

Method 4: add an event listener
<S: button id = "B" label = "Click me once">
<S: creationcomplete>
B. addeventlistener (mouseevent. Click, handleclick );
</S: creationcomplete>
</S: button>
<FX: SCRIPT>
<! [CDATA [
Import MX. Controls. Alert;

Private function handleclick (Event: mouseevent): void
{
B. Enabled = false;
MX. Controls. Alert. Show ('clicked! ');
}
]>
</FX: SCRIPT>

 

FinallyCodePaste

 

XML Code

2. <Span Style="Font-size: Medium"><?XML Version="1.0" Encoding="UTF-8"?>
4. <S: Application Xmlns: FX=Http://ns.adobe.com/mxml/2009"
6. Xmlns: S="Library: // ns.adobe.com/flex/spark"
8. Xmlns: MX="Library: // ns.adobe.com/flex/mx" Minwidth="955" Minheight="600">
10. <FX: script>
12. <! [CDATA [ 
14. Import MX. Controls. Alert; 
16.  
18. Private function handleclick (Event: mouseevent): void 
20. { 
22. Alert. Show ('helloworld', 'hs '); 
24. } 
26. ]>
28. </FX: script>
30. <FX: Declarations>
32. <! -- Place non-visual elements (such as services and value objects) Here -->
36. </FX: Declarations>
38. S: button x = "69" Y = "82" label = "button" click = "alert. show ('helloworld', 'hs '); " />
40. <S: buttonX="170" Y="82" Label="Button">
42. <S: Click>
44. <! [CDATA [ 
46. Alert. Show ('helloworld', 'hs '); 
48. ]>
50. </S: Click>
52. </S: button>
54. S: button x = "287" Y = "84" label = "button" click = "handleclick (Event) " />
56. <S: button X="403" Y="83" Label="Button" ID="C" >
58. <S: creationcomplete>
60. C. addeventlistener (mouseevent. Click, handleclick );
62. </S: creationcomplete>
64. </S: button>
70. </S: Application>
72. span >