Adds the class value
to the element if it is not on it, removes it if it is.
If shouldAdd
is true, then we always add that value
to the element. If shouldAdd
is false then we always remove value
from the element.
If this corresponds to one element, returns true
if value
is present after the operation, and returns false
if value
is absent after the operation.
If this corresponds to many elements, null
is always returned.
value
must be a valid 'token' representing a single class, i.e. a non-empty string containing no whitespace. To toggle multiple classes, use toggleAll.
bool toggle(String value, [bool shouldAdd]);
© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/2.0.0/dart-html/CssClassSet/toggle.html