Change the value of the formtarget attribute of a button:
document.getElementById("myBtn").formTarget = "_self";
This example contains a form with a submit button that submits the form to a new window:
Click button to change the value of the formtarget attribute of the submit button.
<!DOCTYPE html> <html> <body> <form action="/action_page.php" method="get"> First name: <input type="text" name="fname" value="CSS"><br> Last name: <input type="text" name="lname" value="HTML"><br> <button id="myBtn" type="submit" formtarget="_blank">Submit</button> </form>/*from w ww .j a va2s. c o m*/ <button onclick="myFunction()">Test</button> <p id="demo"></p> <script> function myFunction() { document.getElementById("myBtn").formTarget = "_self"; document.getElementById("demo").innerHTML = "The value of the formtarget attribute was changed."; } </script> </body> </html>