Selectors: findAncestor

gistfile1.txt

function matchesSelector(el, selectorText, ctx) {
    var all = (ctx||el.ownerDocument).querySelectorAll(selectorText);
    return indexOf(all, el) != -1; 
    
}

function findAncestor(el, selectorText, container) {
    if(el == null || el === container)
        return null;
    var parent = el.parentNode; 
    while(parent && parent != container) {
        if(matchesSelector(parent, selectorText, container)) {
            return parent;
        }
        parent = parent.parentNode;
    }
    return null;
}