How to delete a localStorage item when the browser window tab is closed

+1 vote

My Case: localStorage with key + value that should be deleted when browser is closed and not single tab.

Please see my code if its proper and what can be improved:

//create localStorage key + value if not exist
if(localStorage){
   localStorage.myPageDataArr={"name"=>"Dan","lastname"=>"Bonny"}; 
}

//when browser closed - psedocode
$(window).unload(function(){
  localStorage.myPageDataArr=undefined;
});
Jun 11, 2020 in Java-Script by kartik
• 37,530 points
3,964 views

1 answer to this question.

+2 votes

Hii @kartik,

You can make use of the beforeunload event in JavaScript.

Using vanilla JavaScript you could do something like:

window.onbeforeunload = function() {
  localStorage.removeItem(key);
  return '';
};

That will delete the key before the browser window/tab is closed and prompts you to confirm the close window/tab action. I hope that solves your problem.

Thank you!!

answered Jun 11, 2020 by Niroj
• 82,820 points

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