before_next_page and pre-filled radio buttons

[eka...@umich.edu]

I am having an issue with before_next_page and pre-filled radio buttons. 

Essentially, I have a binary choice with the following radio buttons, where we pre-checked one of the two choices in HTML.   However, if the subject clicks next, the choice is recorded as "none" in player variables.  

<input type="radio" name="{{ t.id }}" value="0" checked onclick="sendPref(this)">
<input type="radio" name="{{ t.id }}" value="1" onclick="sendPref(this)">

Is there a way to remedy this?  I.e., have "sendPref" work automatically with the default value that is pre-checked?

[Chris @ oTree]

Does it need to be a live page? How about a regular form field with a radio widget?

If it does need to be a live page, it’s recommended to follow the pattern described here:

https://otree.readthedocs.io/en/latest/live.html#example-tic-tac-toe

On the server, define the current value of the field. Then when the player loads the page, make an empty liveSend that queries which option is currently selected. 

That is better than hard coding in the HTML which option is selected because it works even if the user selects another option then reloads the page. 

Sent from my phone

On May 17, 2022, at 12:02 AM, eka...@umich.edu <eka...@umich.edu> wrote:

I am having an issue with before_next_page and pre-filled radio buttons. 

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[eka...@umich.edu]

Thanks, this is helpful!