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Change Class

This lesson is part of How To · All levels

Summary

Change class means replacing one class with another class on the element, for example from 'info' to 'warning'. The Method deals with substitutions without touching other classes that may still be needed. The alternative is to remove the old class and add the new class in sequence.

Key points

ClassList.replace('old', 'new') replacing one class with another class
Method returns true if the old class is found and replaced
Other classes on the element remained intact
Avoid className assignment because it overlaps the entire class list

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