I'm new at jquery. Once used mootools and infact prototype. I start using this pack because drupal uses.
I start writing code by my way. I got elements selecting $("#myDiv div") and tried to convert all of themat once. In jquery docs like php correspondance foreach I found each function.

$("#myDiv div").each(
function (index, foo){
//do someting with foo
}
)

But weired thing happened, my code didnt work! The perfect explanation should be

each provides, when selecting elements, elements it self. Its prototype is not touched by jquery. If you want jquery extensions work, you should use $(foo).

After a while I found there is no need for index or elem. Using this gives the same result. Perfect implication is:


$("#myDiv div").each(
function (){
$(this).width(this.childNodes.length*500 + 'px');
}
);