需要JQuery帮助：在更改事件之前，组合框中的哪个事件触发
问题描述：
如果用户通过使用JQuery显示警报msg来选择已经选择的语言，我想限制用户。
在更改事件之前是否有任何事件触发。
I want to restrict the user if they select the language which is already selected by displaying alert msg using JQuery. Is there any event which fires before the change event.
答
我在这种情况下所做的是：
What I did in this kind of situation was:
在更改事件中，将现有值与新选择的值进行比较。
如果值在那里，我警告消息并将组合框重置为默认选择。
In Change event, compare the existing values with newly selected one. if value is there, I alert the message and reset the combo box to default selection.