Set a week field to be a required part of form submission:
document.getElementById("myWeek").required = true;
Click the button to set the required property for the week field.
input elements with type="week" are not supported in Internet Explorer or Firefox.
<!DOCTYPE html> <html> <body> <form action="/action_page.php"> Week: <input type="week" id="myWeek" name="week_year"> <input type="submit"> </form>// ww w . j av a 2s .c o m <button onclick="myFunction()">Test</button> <p id="demo"></p> <script> function myFunction() { document.getElementById("myWeek").required = true; document.getElementById("demo").innerHTML = "The required property was set. The week field must now be filled out before submitting the form."; } </script> </body> </html>