Flex中如何通过prompt属性在ComboBox控件中添加一个提示项(prompt)的例子
By Minidxer | June 5, 2008
接下来的例子演示了Flex中如何通过prompt属性，在ComboBox控件中添加一个提示项(prompt)。例子中你可以通过点击“Reset ComboBox”按钮(将selectedIndex设为-1)来初始化ComboBox。
我们先来看一下Demo（可以右键View Source或点击这里察看源代码）：
下面是完整代码(或点击这里查看)：
Download: main.mxml
- <?xml version="1.0" encoding="utf-8"?>
- <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
- layout="vertical"
- verticalAlign="top"
- backgroundColor="white">
- <mx:Array id="arr">
- <mx:Object abbrev="AL" name="Alabama" />
- <mx:Object abbrev="AK" name="Alaska" />
- <mx:Object abbrev="AZ" name="Arizona" />
- <mx:Object abbrev="AR" name="Arkansas" />
- <mx:Object abbrev="CA" name="California" />
- <mx:Object abbrev="CO" name="Colorado" />
- <mx:Object abbrev="CT" name="Connecticut" />
- </mx:Array>
- <mx:ApplicationControlBar dock="true">
- <mx:Button id="button"
- label="Reset ComboBox"
- click="comboBox.selectedIndex = -1;" />
- </mx:ApplicationControlBar>
- <mx:ComboBox id="comboBox"
- dataProvider="{arr}"
- labelField="name"
- prompt="Please select a state..." />
- </mx:Application>
代码：Peter deHaan 翻译/整理/编译：minidxer
Topics:
Flex |
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Tags: ComboBox, Flex, prompt, selectedIndex