[jquery selector: focus] This selector matches the element that currently acquires focus

Matches the element that currently acquires focus.

As with other pseudo-class selectors (those starting with ":"), it is recommended that the focus is preceded by a tag name or other selection; otherwise, universal selection ("*") is self-evident. In other words, $ (': Focus ') equals $ (' *:focus '). If you are looking for the current focus element, $ (document.activeelement) will be retrieved without having to search the entire DOM tree.

Instance:

<! DOCTYPE html>input{padding-left:8px;font:400 13px/1.2em ' Courier New ';} . focused{background: #E9B; color: #000; outline:none;}</style><script type= ' Text/javascript ' >    $(function(){       $("Input:focus"). AddClass (' focused ')); });</script>

[jquery selector: focus] This selector matches the element that currently acquires focus