Pro PHP and jQuery by Jason Lengstorf.pdf - Computer Science ...

CHAPTER 2 ■ COMMON JQUERY ACTIONS AND METHODS
Figure 2-9. Span text appears bold and italicized after wrapping it with strong and em tags
To use a callback function to generate the desired HTML tag to wrap an element with, you must
return a tag from the callback. For instance, to wrap all spans with the class foo in strong tags and all
other spans in em tags, execute the following code:
$("span").wrap(function(){
return $(this).is(".foo") ? "" : "";
});
After executing this snippet, the browser shows one span in italics, and the other (the one with class
foo) in bold (see Figure 2-10).
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