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I know in jQuery if we use ID to select elements,it’s so efficient.I have a question about this selectors:
please consider this 3 selectors:
$('#MyElement')
$('#Mytbl #MyElement')
$('#Mytbl .MyClass')
which one is faster and why?How I can check the time elapsed to select my element in jQuery?
A direct ID selector will always be the fastest.
I’ve created a simple test case based on your question…
http://jsperf.com/selector-test-id-id-id-id-class
Selecting nested ID’s is just wrong, because if an ID is unique (which it should be), then it doesn’t matter if it’s nested or not.