How do I assign the post parent?

You should use the save_post hook to handle your meta box and set the post_parent field of the post.

An alternative aproch is to look at the page edit page and check what is the name of the “parent page” drop down and use the same for your dropdown instead of the parent_id you use right now.

Related Posts:

  1. How to create a permalink structure with custom taxonomies and custom post types like base-name/parent-tax/child-tax/custom-post-type-name
  2. How to set parent-child relationship between differents custom post types
  3. Integrating a custom post type into a page hierarchy
  4. Nested custom post types with permalinks
  5. Change custom post type to hierarchical after being registered
  6. How To Limit Hierarchical Pages Depth (For Custom Post Types) To Children Only
  7. Display a list of child posts on parent posts of a custom post type
  8. Custom Post Type as Page parent
  9. How to handle a hierarchy with custom post types
  10. Can I have Post Types under other Post Types in Admin menu?
  11. set a CPT as parent of a page
  12. Hierachical Custom post types permalinks not working
  13. Child pages on hierarchical Custom Post Types 404s
  14. How can I combine posts of different types in one hierarchy?
  15. Custom Post Type ‘hierarchical’ Help!
  16. How to check if last uri segment is a custom post type or taxonomy term?
  17. Custom permalinks – post type – hierarchical taxonomy’s
  18. How to show term-specific post list, without posts associated with child terms?
  19. How to query for posts (in hierarchical custom post type) that have children?
  20. Getting taxonomy terms used by custom post type
  21. Custom Taxonomies: Multiple Hierarchical Permailnks For A Single Post + Prev/Next Links
  22. wp_list_pages doesn’t work in hierarchical custom post type
  23. Post type hierarchy
  24. Detect if 1st, 2nd or 3rd level custom page?
  25. Hierarchical Custom Post Types or Similar
  26. Custom post type routing with hierarchy
  27. Parent / Child formatting in a list of post of a custom post type
  28. Show hierarchical relationship between to custom post types on admin list
  29. Custom post type hierarchical permalinks not behaving as expected for parent/child pages
  30. How to create a permalink structure with custom taxonomies and custom post types like base-name/parent-tax/child-tax/custom-post-type-name
  31. How to Combine Two Custom Post Types into Single Permalink Structure
  32. Custom Posts Hierarchy? (State/City/Restaurant)
  33. Automatically populate a hierarchical taxonomy from a custom field
  34. Hierarchical Custom Posts – Highlighting Current Post in Sub-Menu
  35. Remove base slug in permalinks of hierarchical custom post type
  36. Modifying Custom Post Type after registration (will it affect content?)
  37. Hierarchical Custom Post Types – Show only parent on tax archive?
  38. Twenty Fifteen: Adjacent posts by menu_order [duplicate]
  39. Display custom post type in hierarchical order with get_terms
  40. Should I use custom taxonomy or custom post type
  41. How to get the parent of a non-hierarchical custom post type being edited in Gutenberg
  42. Custom Post Type / Two level deep taxonomy (cat. and subcat.) uri problem (error 404)
  43. Hierarchical Custom Post Types in Array
  44. WordPress Custom Post Type Children Template
  45. Use a hierarchical custom post type for a main blog and subblogs?
  46. How to create custom url structure based on custom post type rewrite slug, taxonomy and category slug?
  47. How to set a CPT to have a page as a parent, then rewrite urls accordingly?
  48. Rewrite Rule for showing Parent/Child Relationship between Two Hierarchical Custom Post Types
  49. Need help with permalink rewrites for Custom Post Types with hierarchical relationships
  50. Rewrites/query for multiple hierarchical custom post types
  51. A case for Hierarchical Custom Posts
  52. Custom while loop for hierarchical display of a taxonomy
  53. Get the taxonomy of a post hierarchically
  54. Custom Post Types hierarchy and rewrite
  55. Custom post type / taxonomy rewrite archive page 2 gives 404
  56. Create more category hierarchical depth for custom post type/taxonomy plugin (widget)
  57. Hierarchial Custom Post Types/Taxonomies
  58. Hierarchical permalinks for custom post type and taxonomy
  59. using wp_update_post for updating custom post type
  60. Custom post type Permalinks with hierarchical Taxonomies
  61. Create a permalink structure with custom taxonomies and custom post types gives 404
  62. Custom Post type & Taxonomy 404
  63. Is it safe to change a Custom Post Type from “hierarchical:false” to “hierarchical:true”?
  64. get parent content inside child posts
  65. page template for custom post type
  66. Templates for hierarchical custom post type
  67. Creating a non-hierarchical Taxonomy that behaves like categories
  68. How to query for posts (hierarchical custom post type) that have children but are NOT top level?
  69. Migrating Hierarchal Taxonomy Categories Between Post Types
  70. Ideas on how to organize a project [closed]
  71. Add search to ‘Parent’ dropdown
  72. How should I structure complex content hierarchies?
  73. Query all post types but limit to parents
  74. List child categories from parent category on custom taxonomy page
  75. Custom post type hierarchical loop in Homepage
  76. Does “Custom Post Type” can have page hierarhy option?
  77. Creating an Events Feed with Sub Pages/Posts for Each Event
  78. How to set a ‘page’ as parent of a custom post type?
  79. Permalink with hierarchy of Custom Post Types
  80. Having hierarchies inside WordPress custom post type
  81. How to convert hierarchical Pages to hierarchical Custom Post Types? Slugs get a number as if they were duplicates
  82. Custom Post Type parent/child relationship rewrite rules for permalinks
  83. Attempting to get number of grandchildren of page in WP_Query loop
  84. Custom post types & Pages hierarchy – Error 404
  85. Create a Hierarchical List of Custom Taxonomies AND Posts
  86. Display posts of a hierarchical custom post type excluding parent posts
  87. Most efficient way of showing children posts?
  88. Hierarchical Custom Post Type Walker?
  89. Display a Custom Post Type within another with hierarchically slug
  90. Custom Post Hierarchy and users
  91. Custom Post Type categories at edit post not hierarchical
  92. How can I add a “fake” parent into the permalink?
  93. taxonomy term names in custom post type permalink structure
  94. Custom Post Type Child Pages
  95. Cross post type parent page added parent page to permalink but give 404
  96. Hierarchy between post types
  97. Custom taxonomy archive not showing posts of certain child taxonomies
  98. Specifying Default Template for Hierarchal Custom Post Type [duplicate]
  99. Hierarchical Custom Post Types
  100. How to add a regular page under a custom post type?
tech