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felgall · 11-29-2012, 01:59 AM

That would overwrite any classnames already on the elements.

To keep the existing classes and add a new on simply add a space and the new class name to the end of the existing class list.

You should also use a regular expression to test for the class name with a boundary on either side in order to allow for it not being the only class in the class attribute.

See http://javascriptexample.net/dom04.php for the sort of loop you'd have using getElementsByClassName that also adds that method for browsers that don't already have it.

11-29-2012, 01:59 AM	PM User \| #6
felgall Master Coder Join Date: Sep 2005 Location: Sydney, Australia Posts: 5,449 Thanks: 0 Thanked 496 Times in 488 Posts	That would overwrite any classnames already on the elements. To keep the existing classes and add a new on simply add a space and the new class name to the end of the existing class list. You should also use a regular expression to test for the class name with a boundary on either side in order to allow for it not being the only class in the class attribute. See http://javascriptexample.net/dom04.php for the sort of loop you'd have using getElementsByClassName that also adds that method for browsers that don't already have it. __________________ Stephen Learn Modern JavaScript - http://javascriptexample.net/ Helping others to solve their computer problem at http://www.felgall.com/