javascript - addclass() working in console but not working in script -

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i have created div dynamically. tried add class expanded through jquery not working. tried code in console, working fine there.

code follows:

appending element name

var menuid= '#itemmenu' + indexofelement;

and tried this

$(menuid).addclass('expanded');

when tried folllowing in console

e.g. $('#itemmenu5').addclass('expanded')

its working fine..

var menuid= 'itemmenu' + indexofelement; var element = document.getelementbyid(menuid); element.classname += ' expanded';   //note space

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