Question

I am trying to lookup elements within a dynamically created element. For some reason this fails. Why does the following return “0”? How to fix this?

  alert($('<p id="aa">xxx</p>').find("#aa").length);

Answer 1

$('<p id="aa">xxx</p>').find("#aa") // looks inside the element you're holding

you want to filter based on the elements in your existing collection:

$('<p id="aa">xxx</p>').filter("#aa")

and thus

alert( $('<p id="aa">xxx</p>').filter("#aa").length );