too long

Question

How can I pass variable from input field to form like this and is it possible?

<form method="POST" action="https://accounts.google.com/o/oauth2/auth?login_hint=<?= $_GET['email']?>" id= "frmTest" name = "frmTest">
   <input type="email" id="email" name="email"  />
   <input type="submit" id="submit" name="submit" />
</form>

Or maybe with javascript somehow? When user fill out that form and click on submit button I want that form redirect him to https://accounts.google.com/ where it will display that email and user will just enter his password

Answer 1

If you use the POST method in your form, you can't add GET query parameter in your action attribute.

In a POST form these parameters in the action URL will be discarded. So either send your form as GET (method="GET") and keep the query string as is, or keep it as POST and add the fields in hidden inputs like:

<form method="POST" action="https://accounts.google.com/o/oauth2/auth" id="frmTest" name="frmTest">
  <input type="hidden" name="login_hint" value="<?php echo $_GET['email']; ?>" />
  <input type="submit" id="submit" name="submit" />
</form>