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<!DOCTYPE html> <html> <head> <title>Title of the document</title> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.0/jquery.min.js"></script> </head> <body> <button type="button" class="add-attr">Select Checkbox</button> <input type="checkbox"> <script> $(document).ready(function() { $(".add-attr").click(function() { $('input[type="checkbox"]').attr("checked", "checked"); alert('Checked!'); }); }); </script> </body> </html>