目前,我正致力于一个项目,该项目需要一个方言或背景菜单,以便在盒子中的案文与某种ex形相匹配时显示。
举例来说，如果我要在文本区域中键入@user，一个对话框将会出现在光标所在的位置或者刚刚键入文字下方，其中包含一个由Ajax生成的可能匹配用户名称的列表。
有没有任何JavaScript包（最好是jQuery插件），可以完成这种功能？
我认为你所寻找的是一个 jQuery 自动完成插件。这里是一个列出了10个插件的网站：http://webtecker.com/2008/03/10/10-auto-complete-ajax-scripts/。
（声明：我和这个网站没有任何关系。）
You can try this: http://docs.jquery.com/Plugins/Autocomplete
您可能需要调整它以符合您的要求，但基本功能已经存在。
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