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Mutation Observer

  1. // Select the node that will be observed for mutations
  2. const targetNode = document.getElementById('some-id');
  3.  
  4. // Options for the observer (which mutations to observe)
  5. const config = { attributes: true, childList: true, subtree: true };
  6.  
  7. // Callback function to execute when mutations are observed
  8. const callback = function(mutationsList, observer) {
  9.     // Use traditional 'for loops' for IE 11 (goodbye IE11!!!!)
  10.     for(const mutation of mutationsList) {
  11.         if (mutation.type === 'childList') {
  12.             console.log('A child node has been added or removed.');
  13.         }
  14.         else if (mutation.type === 'attributes') {
  15.             console.log('The ' + mutation.attributeName + ' attribute was modified.');
  16.         }
  17.     }
  18. };
  19.  
  20. // Create an observer instance linked to the callback function
  21. const observer = new MutationObserver(callback);
  22.  
  23. // Start observing the target node for configured mutations
  24. observer.observe(targetNode, config);
  25.  
  26. // Later, you can stop observing
  27. observer.disconnect();

This is pure gold if you haven’t used it… (from MDN)

// dom // events // graphics // html // javascript // ui
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