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I created a custom field type to show user groups in a checkbox layout, e.g. (http://cl.ly/image/0A1a140m031h).

I am running into one small issue. If I add content with a checkbox(s) option selected and save the entry. Then I try to edit the entry and uncheck all the options, the entry will still have the original checkbox options selected and won't return to the null state as expected. I was trying to use prepValueFromPost but that doesn't seem to run unless the value is set. How do I fix this?

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This isn't really an answer. But I think I do know what might be happening. The default browser behavior is that checkbox values only get submitted when it has the attribute 'checked' (why? I have no idea). In php you're essentially testing whether the post value exists or not. If it exists, true; if not, false. I assume for the built-in checkbox fieldtype that craft does this for you in the background (by somehow comparing with the original options). You'll have to figure out a way to perform this check yourself. Maybe take a look at the source files and see how craft is handling this.

  • If I recall, we add a hidden input for each checkbox that has an actual 0 or 1 value. – Brad Bell Jan 20 '15 at 18:32
  • Thanks, I figured that could be an approach, a hidden field, but wasn't sure if there was a better route. I was able to resolve the issue. – mz91184 Jan 20 '15 at 23:23
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If it helps anyone else, if you have a checkbox field in Craft with multiple options, you can use the hidden field approach with a value of [].

For example, two checkboxes, one with value="newsletter" and another with value="events", both with name="marketing[].

Then include a hidden field above them with value="[]" and name="marketing".

Important to leave off the [] from the hidden field's name.

This will mean that if no checkboxes are checked, it will set all of them to null/unchecked in Craft. However, as soon as any are checked, they will overwrite the hidden field safely.

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