How to do onblur?

[davistom]

I want to check whether the multiple select is null on onblur and if then show an error message that at least one option should be select, but when i tried .blur() on it's not working. how can I implement onblur in multiple-select?

[wenzhixin]

http://wenzhixin.net.cn/p/multiple-select/#focus-blur
http://wenzhixin.net.cn/p/multiple-select/#the-callbacks-events