is-older

Compare the age of two elements based on their position in the DOM

Compares two elements to see which is "older" (higher up in the DOM). Age is determined by the number of ancestors each element has. Can be passed as a sort callback when using Array.sort

Installation

Install via npm.

$ npm i is-older --save

Usage

Require and call.

<div>
  <div id="two">
    <p id="one"></p>
  </div>
  <p id="three"></p>
</div>

var isOlder = require('is-older');

var one = document.getElementById('one');
var two = document.getElementById('two');
var three = document.getElementById('three');

console.log(isOlder(two, one));   // returns 1
console.log(isOlder(one, two));   // returns -1
console.log(isOlder(one, three)); // returns 0

Sorting

You can pass as a callback to Array.sort to arrange a collection of elements by their age:

var els = document.querySelector('*');

console.log(els.sort(isOlder)).reverse();
// `els` is sorted from oldest to youngest

console.log(els.sort(isOlder));
// `els` is sorted from youngest to oldest