getPreviousSiblings.js
Get the previous sibling of an element that matches a selector.
/*!
* Get previous sibling of an element that matches selector
* (c) 2018 Chris Ferdinandi, MIT License, https://gomakethings.com
* @param {Node} elem The element
* @param {String} selector The selector to match against
* @return {Node} The sibling
*/
var getPreviousSibling = function (elem, selector) {
// Get the next sibling element
var sibling = elem.previousElementSibling;
// If there's no selector, return the first sibling
if (!selector) return sibling;
// If the sibling matches our selector, use it
// If not, jump to the next sibling and continue the loop
while (sibling) {
if (sibling.matches(selector)) return sibling;
sibling = sibling.previousElementSibling;
}
};