how to get all parent nodes of given element in pure javascript?

You can try something like:

var nodes = [];
var element = document.getElementById('yourelement');
nodes.push(element);
while(element.parentNode) {
    nodes.unshift(element.parentNode);
    element = element.parentNode;
}

A little shorter (and safer, since target may not be found):

var a = document.getElementById("target");
var els = [];
while (a) {
    els.unshift(a);
    a = a.parentNode;
}