@kickscondor/umbrellajs/src/plugins/closest/closest.js

Lightweight and intuitive javascript library

// Find the first ancestor that matches the selector for each node
u.prototype.closest = function (selector) {
  return this.map(function (node) {
    // Keep going up and up on the tree. First element is also checked
    do {
      if (u(node).is(selector)) {
        return node;
      }
    } while ((node = node.parentNode) && node !== document);
  });
};