enhance .toggleClass

[cloudream]

1. remove/re-add all original CSS class

implement: save original class to $.data on elements

Case: el: <span class="a b" />

step#1:$(el).toggleClass(); -save "a b" to $.data(this,"originalClass"), then remove "a b" class on this element. step#2:$(el).toggleClass(); -restore $.data(this,"originalClass")(if exists) to this element.

And with boolean: step#1:$(el).toggleClass(false); -save "a b" to $.data(this,"originalClass"), then remove "a b" class on this element.

step#1:$(el).toggleClass(true); -restore $.data(this,"originalClass")(if exists) to this element.

2.handle multi-class without boolean. use .toggleClass("c b") instead of .toggleClass("c").toggleClass("b")

implement: split className string before pass it to $.className[add/ remove], and handle each one separately

Case: el: <span class="a b" />

step#1:$(el).toggleClass("b c"); -remove class "b" and add class "c" on this element. step#2:$(el).toggleClass("b c"); -remove class "c" and add class "b" on this element.

[iraebrasil]

unit test and core implementation proposal for #3825 enhancement (forgot one cleanup)

[brandon]

Added in r6332.

[kswedberg]

added documentation at ​http://api.jquery.com/toggleClass/