Check if class exists somewhere in parent - vanilla JS

Question

I\'m really struggling to see how to do this. I want to check if a class exsits somewhere in one of the parent elements of an element.

I don\'t want to use any libra

Answer 1

You'll have to do it recursively :

// returns true if the element or one of its parents has the class classname
function hasSomeParentTheClass(element, classname) {
    if (element.className.split(' ').indexOf(classname)>=0) return true;
    return element.parentNode && hasSomeParentTheClass(element.parentNode, classname);
}

Demonstration (open the console to see true)