jQuery: what is $("*", document.body).click(function (event) {...});


I saw this in the jquery doc page:

Just wondering what is the '*' asterisk, document.body?
What does the second parameter do? Is is a relative DOM?

$( "*", document.body ).click(function( event ) {
  var offset = $( this ).offset();
  $( "#result" ).text( this.tagName +
    " coords ( " + offset.left + ", " + offset.top + " )" );

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Much thanks and Father bless<><
Victor KimuraSEO, Web DeveloperAsked:
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Alexandre SimõesManager / Technology SpecialistCommented:
jQuery selectors are DOM selectors, which means they comply with CSS selectors (in most cases).
So this said, * means every single DOM Element on the page, just like * means in CSS.

The second parameter defines the scope of the selector. In this case is the document.body, which doesn't add much in terms of logic... it will still match everything on the page.

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Alexandre SimõesManager / Technology SpecialistCommented:
Ah sorry, the second parameter here actually adds something.
It prevents the body itself from getting the click event handler.

Here's a simple example: http://jsfiddle.net/AlexCode/xUvm4/
check the first one : http://api.jquery.com/category/selectors/

yes "*" mean everything
the second parameter specify the context, everything in what, from where?

test page : http://jsfiddle.net/ABLhx/1/

<div id="only">

$("*", document.body) // all inside the body
$("*", "#only") // all inside the div#only

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Victor KimuraSEO, Web DeveloperAuthor Commented:
I see. Thank you, fellas! That's helpful. =)
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