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<!DOCTYPE html> <html> <body> A Checkbox: <input type="checkbox" id="myCheck" value="myvalue"> <p>Click the buttons below to display and/or change the value of the value attribute of the checkbox above.</p> <button onclick="display()">Display name</button> <button onclick="change()">Change name</button> <script> function display() { var x = document.getElementById("myCheck").value; alert("The value of the checkbox is: " + x); } function change() { var x = document.getElementById("myCheck").value = "newCheckboxValue"; alert ("The value was changed to: " + x); } </script> </body> </html>