首先,我讨厌提出已经处理过的问题,但你应该知道我在这个网站上找到的其他选项对我不起作用.
基本上,我想构建一个简短的表单,其中有两个下拉框.第一个始终显示,第二个默认隐藏.当选择第一个下拉框中的某个选项时,我想要显示第二个下拉框.这是我的意思的完美例子:
HOWEVER, unlike the above example, I have a separate set of options to display in the dropdown box for EACH option selected in the first dropdown box, and not just for one of the options. In other words, in the above example, if you select "China" the second dropdown box will appear, but if you select anything else it will remain hidden. That's not what I want. I want a different dropdown to display if you selected …