Thanks! Your solution would be ideal for most people.
Unfortunately, remove_action isn’t available to me, because I’m using Tom McFarlin’s WordPress Plugin Boilerplate. (add_action/filter become methods, no equivalent for remove). Adding a remove_action has been discussed for several years but not implemented.
This fork of WPPB adds a remove method.
However in the end, I implemented a separate filter just for post title, on wp_insert_post_data, which sets a value for $data['post_title'].
Thanks for the reply. At least I know I hadn’t missed something basic.
I can live with basic radio options for field B, and I suppose I can figure out for that myself the html to be sent from ajax. One issue arises from that though. On initial page load, there would be hundreds of field B options, which would badly break the page layout. Any thoughts on how I can restrict the vertical height of the radio options list? Is there a way to wrap the field in an iframe, for example?
