jQuery - How to select the first parent of an element and add a new class "testclass"

First Name

Given element 'element_1', how to select its first parent with tag name as li?

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$('#element_1').closest('li').addClass('testclass');

$('#element_1').closest('li').addClass('testclass');

assuming you're using jQuery 1.3+ and element_1 is an ID.

jQuery < 1.3 should look like

$('#element_1').parents('li').addClass('testclass');

Reference: .closest(), .parents()