I have the following form:

<form>

    <input type=radio name=group-stack value=grouped checked>grouped<br>

    <input type=radio name=group-stack value=stacked>stacked

</form>

I want to get the currently selected radio button's value using d3.

The following attempts have been unsuccessful:

var val = d3.select('input[name=group-stack]').checked; //undefined

var val = d3.select('input[name=group-stack][checked]')[0][0].value //always 'grouped' regardless of which radio is selected