Problems with data binding with braces {} In Flex

In Flex, we often use braces {} for Data Binding. However, if we perform logical operations and condition operations within {}, we use the & and <symbol,

However, an error is reported when you use this method. This is because the & and <characters are occupied by XML and cannot be used in the bound expression. We can use & amp;

Replace &, use & lt; instead <

The following is an example:

[HTML]View
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1. <? XML version = "1.0" encoding = "UTF-8"?>
2. <S: Application xmlns: FX = "http://ns.adobe.com/mxml/2009"
3. Xmlns: S = "Library: // ns.adobe.com/flex/spark"
4. Xmlns: MX = "Library: // ns.adobe.com/flex/mx" minwidth = "955" minheight = "600">
5. <S: layout>
6. <S: verticallayout/>
7. </S: layout>
8. <FX: declarations>
9. </FX: declarations>
10. <S: textinput id = "ti_src"/>
11. <Mx: Text id = "ti_des" text = "{ti_src.text! = ''& Amp; ti_src.text! = '1 '? Ti_src.text: 'A'} "/>
12. </S: Application>

Reprinted: http://blog.csdn.net/vipliyaohua/article/details/6636794