原理和那个适应宽度的TextBox查不多,只是这个反而更加简单,因为在高度方向上增长不会破坏页面的整体布局效果(宽度上的如果在页内会挤走别的元素的),所以就不需要使用Agent TextBox来作为实际录入的容器了,直接把<TextArea>增高就行了。
响应onpropertychange事件,同步内容和<TextArea>的高度。当然如果完全根据内容增高可能也会因为内容太多而变得难看,就设置了一个最大高度限制属性。控件效果如下:
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![](/Images/OutliningIndicators/ExpandedBlockStart.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
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原文:http://www.cnblogs.com/birdshome/archive/2004/12/29/83338.html