When using $("#xxx") I guess under the hoods jQuery uses getElementById.
What about $(".xxx") does it scan the whole DOM every time?
When using $(#xxx) I guess under the hoods jQuery uses getElementById . What about
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When using $("#xxx") I guess under the hoods jQuery uses getElementById.
What about $(".xxx") does it scan the whole DOM every time?
jQuery attempts to use the fastest selection method to get what you asked for. There are a number of good resources with performance optimization tips out there that relate directly to jQuery:
Good ways to improve jQuery selector performance?
http://www.artzstudio.com/2009/04/jquery-performance-rules/
http://www.componenthouse.com/article-19
http://www.learningjquery.com/2006/12/quick-tip-optimizing-dom-traversal