如何使用垂直滚动条制作下拉菜单？ [英] how to make a drop down menu with a vertical scroll bar?

问题描述

您好，我需要在下拉菜单中放置一个垂直滚动条，起初它只会出现大小= 1，但是当我们下拉它时应该有一个垂直滚动条，
可以帮助我，如果您使用html-dropdownbox，Natrium建议您可以将属性设置为size（大小）属性，选择标记，以指定要显示的行数。因此，如果 - 在他的示例中 - 您将大小设置为3，则会将下拉框设置为3行高，并附加一个滚动条以向下滚动到其余3个项目。

如果你的意思是用CSS表示，假设你在div标签中显示你的下拉菜单，你可以使用类似的东西：

 < div style =height：200px; overflow-y：scroll> ...< / div> 
  

这给你一个绝对高度的div。如果div的内容太大，会自动显示垂直滚动条。

hi i need to put a vertical scroll bar in the drop down menu such that at first it will appear only size=1 but when we drop down it should have a vertical scroll bar , can anybody help me , i would really appreciate any help

解决方案

If you use the html-dropdownbox, Natrium suggested, you can set the attribute "size" of the select tag, to specify how many lines you want to show. So if - in his example - you set size to 3, you'd have the dropdownbox 3 lines high and a scrollbar attached to scroll down to the remaining 3 items.

If you mean something with CSS, say you display your dropdown-menu in a div-tag, you could use something like that:

<div style="height:200px; overflow-y:scroll">...</div>

This gives you a div with an absolute height. If the content of the div gets too big, a vertical scroll bar is displayed automatically.

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