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How to change select when pressed on button on different page?

merijn van der leek
on
I have this site with a navigation bar with a dropdown. On the other site i have a select with two values.
This is the dropdown:
         <button class="dropbtn">Login</button>
                    <div class="dropdown-content">
                        <a class = "teacher" href="login">Teacher Login</a>
                        <a class = "student" href="login">Student Login</a>
                    </div>

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And this is the select i am using:
    <form class = "login" action="/login" method="post">
        <div class="form-group">
            <select class="form-control" name="role">
                <option disabled selected value="role">Role</option>
                        <option value="teacher">Teacher</option>
                        <option value="student">Student</option>
            </select>

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So my question is : how can i  make it that if the user clicks on student login the select will stand on value "student" and the other way around?
The select is on a different page then the login dropdown so that makes it hard for me.
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Most Valuable Expert 2017
Distinguished Expert 2019
Commented:
You need to pass the selection in the URL and then in  the receiving page look for that option and select the relevant option in the select on the target page

On the sending page
<a class = "teacher" href="login?option=teacher">Teacher Login</a>
<a class = "student" href="login?option=student">Student Login</a>

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On the receiving page (give your <select> an id so you can find it - for example selectRole
<script>
window.addEventListener('load', function() {
  var role = window.location.search.split('=')[1].split(',');  
  if (role) {
    document.getElementById('selectRole').value = role;
  }
});
</script>

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Working sample here

Author

Commented:
Thanks so much great solution!!
Most Valuable Expert 2017
Distinguished Expert 2019

Commented:

You are welcome.