Detecting user devices

[Neda Jafarian]

Hi,

I have a task in my experiment that can't be done on mobile phones. I am trying to detect the user devices by this library:
https://pypi.org/project/user-agents/
But I can't figure out how to get the user agent string in the oTree.
Would you please help me with this?

Best regards,

Neda

[Chris @ oTree]

See the detect_mobile example here: https://www.otreehub.com/projects/otree-snippets/

[Pipoca]

Hi! I've noticed that the detect_mobile app doesn't allow you to continue even if you try to access it again with a desktop pc or laptop. How should we edit that code to allow access in that scenario?

[Pipoca]

In oTree <5, you could just have a single page without a next button that is displayed if the user is not using a mobile device. If you did the switch to valid device, that page wasn't displayed. The backend was like this:

class TestMobile(Page):

    def is_displayed(self):

        # Here, we'll obtain the type of user we've

        user_agent = self.request.META['HTTP_USER_AGENT']

        # Default value

        self.participant.vars['is_mobile'] = False

        # The default is changed if the player is mobile

        for substring in ['Mobi', 'Android']:

            if substring in user_agent:

                self.participant.vars['is_mobile'] = True

        return self.participant.vars['is_mobile']

Is there a way to do the same with oTree >= 5?

[Chris @ oTree]

Good point, I just fixed it!

[Pipoca]

Do you mean you fixed otree 5 or the example? haha, I've just updated my otree installation, but I keep getting this error:

 user_agent = self.request.META['HTTP_USER_AGENT']

AttributeError: 'Request' object has no attribute 'META'

[Chris @ oTree]

I mean that i fixed the example in otree-snippets. The request.META stuff is not going to work in oTree Lite.