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Find preventDefault or stopPropagation JavaScript

  1. Event.prototype.preventDefault = () => {
  2.   debugger;  
  3. };
  4.  
  5. // @NOTE `stopPropagation` or `stopImmediatePropagation` could also be 
  6. // preventing events 
  7.  
  8. // Event.prototype.stopPropagation = () => {
  9. //   debugger;  
  10. // };

This is a real life saver – especially for large confusing legacy projects with lots of event logic. You can use this to track down an unwanted preventDefault and/or stopPropagation. I needed this recently to see which of many calls to preventDefault was preventing my touch events from working in a certain area.

I usually pop this into the console and step through things. If you’ve never seen debugger before read about it here…

// events // javascript

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