wp query - How to add an extra parameter to searches on the admin listing screen for my custom post type

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I have defined a custom post type. On the admin listing screen I am filtering this based on a querystring argument. So if my querystring includes 'filter=abc' I show a subset of my custom posts, if the querystring does not include the filter parameter I show a different subset.

The paging navigation buttons respect my querystring parameter, so if I'm on 'filter=abc' and move to the next page, my querystring argument is still present.

However if I use the search box, or navigate directly to a different page number, the parameter is lost. This is obviously because it is not present anywhere in the form with id 'posts-filter'.

I could use DOM manipulation to add a hidden form field to the form, but this feels clumsy. Is there a better way to get WordPress to include my querystring parameter in the form?

Note that I'm not asking about pre_get_posts here, I know how to add this parameter to WP_Query once it is passed to the page. The question is how do I make sure my parameter is passed around when navigating the admin listing page.

Thanks

本文标签： wp queryHow to add an extra parameter to searches on the admin listing screen for my custom post type