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Uncaught TypeError: Cannot read property 'addEventListener' of undefined

Created at 11-Jan-2021 , By samar

With this article, we will examine several different instances of how to solve the "Uncaught TypeError: Cannot read property 'addEventListener' of undefined".

```
<script> 
var el = document.getElementById('overlayBtn');
if(el){
  el.addEventListener('click', swapper, false);
} 
</script>
```
You can simply check variable (el) before adding an event listener to element. If element exists then it will add a click event to it.

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Uncaught TypeError: Cannot read property 'addEventListener' of undefined

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