Set a default value for a CCK checkbox

Resolution: this is built into the field configuration GUI (graphical user interface)! Right under "Label." No need for anything fancy. I am a failure as a Drupal expert.

no working answer:

Default value for CCK Check box field
http://drupal.org/node/200486

Example for allowed values php code?
http://drupal.org/node/125464

Labels for single on/off checkbox field aren't appearing
http://drupal.org/node/115026

Advanced Usage Only: PHP code that returns a keyed array of allowed values. Should not include <?php ?> delimiters. If this field is filled out, the array returned by this code will override the allowed values list above.

return array(0 => array('Default value' => 1));

Does not work, it overrides the Allowed values list above:

0|Receive CDM media alerts by email
1|Receive CDM media alerts by email

So let's build this thing completely:

return array(
  0 => array(
    'value' => 'Receive CDM media alerts by email',
  ),
  1 => array(
    'value' => 'Receive CDM media alerts by email',
    'Default value' => TRUE,
  )
);

Result:

[ ] Array

Rats.

Attempt two, just a test:

return array(
  0 => 'Receive CDM media alerts by email',
  ),
  1 => 'Receive CDM media alerts by email',
);

[ ] Receive CDM media alerts by email

But if I delete

0|Receive CDM media alerts by email
1|Receive CDM media alerts by email

-- even though the returned array is supposed to override, it all disappears!

So it ain't working:

return array(
  0 => 'Receive CDM media alerts by email',
  ),
  1 => 'Receive CDM media alerts by email',
  'Default value' => 1,
);

Ugh!!! Right under "Label" there's a collapsed form field for Default value. Doh!

Resolution

Under the form field:

Label: *

Click the collapsed form field- AFTER you have already submitted the configuration form once, so that the possible values are saved:

Default value

Expanding that, in Agaric's case we see this:

[ ] Receive CDM media alerts by email

Let's just check that off...

Done.

No PHP code needed anywhere.

Off to get my vision checked...