Select All Checkboxes on Facebook Pixel Page

facebook-pixel.user.js

// ----------Select all helper for Facebook pixel----------------------------------------------
//
// ==UserScript==
// @name Select All Checkboxes on Facebook Pixel Page
// @namespace r007.github.com/
// @version 0.01
// @description Multi-select a range of checkboxes
// @include http*://business.facebook.com/ads/manager/*
// ==/UserScript==

var allchecks, thisLink, haveCheckboxes = false;
  allchecks = document.evaluate(
   '//input[@type="checkbox"]',
   document,
   null,
   XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE,
   null);

window.setInterval(function() {
  if (!haveCheckboxes) {
      haveCheckboxes = true;
      check_elements();
  }
}, 100);

function check_elements() {
  if (allchecks.snapshotLength) {
   var logo = document.createElement("div");
   logo.innerHTML = '<div style="background-color: black; margin:0;padding:0;color:white; text-align: center;">Checkboxes check: <a href="#" id="_all" style="color: white">All</a> <a href="#" id="_none" style="color: white">None</a> <a href="#" id="_invert" style="color: white">Invert</a></div>';
   document.body.insertBefore(logo, document.body.firstChild);
  
   _all = document.getElementById('_all');
   _all.addEventListener('click', function(event) {
     for (var i = 0; i < allchecks.snapshotLength; i++) {
       thisLink = allchecks.snapshotItem(i);
       thisLink.checked = true;
       event.preventDefault();
     }
   }, true)
   
   _none = document.getElementById('_none');
   _none.addEventListener('click', function(event) {
     for (var i = 0; i < allchecks.snapshotLength; i++) {
       thisLink = allchecks.snapshotItem(i);
       thisLink.checked = false;
       event.preventDefault();
     }
   }, true)
   
   _invert = document.getElementById('_invert');
   _invert.addEventListener('click', function(event) {
     for (var i = 0; i < allchecks.snapshotLength; i++) {
       thisLink = allchecks.snapshotItem(i);
       thisLink.checked = !thisLink.checked;
       event.preventDefault();
     }
   }, true)
  }  
}