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How to set up a warning message when visiting an external link?

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I have a site on Squrespace. I have added an extenal link as a menu item. So, if anybody click on that menu item, he will visit to the external link. But I want that, if anybody click on that link, first he will get a warning message like "Leaving the current site" and then if he clicks on okay the will visit the linked external site. Is it possible that I can do in the website?

Thank You

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Try Settings > Advanced > Code Injection > Footer

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.1/jquery.min.js"></script>
  $('a').on('click', function() {
   if ( this.host !== window.location.host ) {
      var thisHrefHere = this.href;

      if ( window.confirm("Hey! Warning. U Click another url: "+thisHrefHere+"") ) {
         console.log('Click true and redirecting');
      }else {
         console.log('Click false and no redirect');
         return false;



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