Fill a form without name

[hsch0]

I want to fill in the city name on www.forecast.io but the field has no name:

        <div class="location_controls">
          <input class="location_field" placeholder="Enter a location" x-webkit-speech="" type="text">
          <div class="clear pictos">*</div>
        </div>

my python code

import ghost

g = ghost.Ghost()
with g.start(wait_timeout=20) as session:
    page, extra_resources = session.open("http://forecast.io")
    if page.http_status == 200:
        print("Good!")
        print session.content
        # Waits for form search field
    session.wait_for_selector('.location_field')
    # Fills the form
    session.fill('.location_field', {'???': 'Berlin'})
    # Submits the form
    session.call(".location_field", "submit")
        session.capture_to('forecast.png')

[hsch0]

ok, I got it working with:

session.evaluate("document.getElementsByClassName('location_field')[0].value='Berlin';")