Question - Radio elements and post-validation state about wp-forms HOT 1 OPEN

I ran into this same problem and I was able to patch the repo to get it working. To state the problem more generally, when a form is submitted and validation fails, the selected radio options are not displayed when the form is re-rendered.

The problem (in my opinion) lies in the default radios view - /classes/views/WP_Form_View_Radios.php

The radios element is re-rendered using the WP_Form_View_Radios->radios() method. In this method, there is no logic that will mark a specific radio button as checked. Here is how I fixed the problem in my environment:

Change this:

$output .= $this->radio( $key, $label, $attributes );

To this:

if ($element->get_value() == $key) {
  $output .= $this->radio( $key, $label, $attributes + array('checked' => 'checked') );
}
else {
  $output .= $this->radio( $key, $label, $attributes );
}

And it should work as you expect. This will retrieve the value that the user set in the radios and set that individual radio as checked.

Note that I suspect that this default radios view will also not render any value or default value up front (meaning when the form is originally rendered rather than when it is re-rendered upon validation failure), though I did not test this. In that case, I think the fix would be:

if ($element->get_value() == $key) {
  $output .= $this->radio( $key, $label, $attributes + array('checked' => 'checked') );
}
elseif (empty($element->get_value()) && $element->get_default_value() == $key) {
  $output .= $this->radio( $key, $label, $attributes + array('checked' => 'checked') );
}
else {
  $output .= $this->radio( $key, $label, $attributes );
}

from wp-forms.