This seems extremely odd to me. The onSelect configuration on pikaday should be something that is called before the change event happens since it should be the javascript that handles pikaday that ...

Calling OnSelect of the UnityEngine.UI.Button class without parameters will cause an error. You can reproduce this by adding a GestureManager and UnityEngine.UI ...

比如我有个textarea文本框，我想对其中选定的文本进行操作，如何确定有没有选中文本呀？谢谢各位了！

I have two select boxes.<BR>The first contains categories and the second contains subcategories.<BR><BR>I want to be able to select an option from categories and then the subcategory select box will ...