jQuery: is an element in focus? [duplicate]

This question already has answers here: Closed 11 years ago.

Possible Duplicate:

Using jQuery to test if an input has focus

I have an input element, and I'd like开发者_运维技巧 to ask if it is currently in focus without modifying what is already in focus.

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This can be tricky to determine sometimes, but here is an answer that should help:

Using jQuery to test if an input has focus