Creating a menu page in a Object Oriented developed plugin

You have mix up in static and non-static usage. Your style is non-static, but your methods are declared as such. If you enable WP_DEBUG mode you’ll see following errors:

Notice: Undefined variable: this

Warning: call_user_func_array() expects parameter 1 to be a valid callback, first array member is not a valid class name or object

This happens because static method doesn’t “know” what $this refers to, since static isn’t tied to specific instance of the class.

Simply declare your methods as public rather than public static for this code organization.

Related Posts:

  1. Wondering what these multi-colored extra pages are?
  2. Changing page URL and connect newsletter to MailChip
  3. Page Contents showing in Footer Area
  4. How to disable users to view Other pages
  5. Redirect url in plugin to somewhere else?
  6. Plugin: Custom menu item problem
  7. Get plugin_dir_url() from one level deep within plugin
  8. Check if add_menu_page exists or not
  9. Add custom menu item type
  10. Create page when plugin is activated
  11. How to call “page specific menu items” in template [closed]
  12. How can I show drafts in wp_dropdown_pages list?
  13. WP-PageNavi plugin doesn’t work with multiple pages of search results
  14. Trying to get logged-in user data inside php class
  15. How to make a plugin auto-add item to nav menu
  16. Check if a class exists within a method
  17. Is there a way to lock certain pages from being edited by anyone other then the admin?
  18. Replace existing pages with new pages, keep menu links
  19. Multiple navigation menus to a location?
  20. Making menu link open in new tab?
  21. Show a special message for private page?
  22. How can plugins have their own pages?
  23. Add a plugin before main container
  24. Calling custom plugin class methods from a template
  25. How to make a customize role and view a specific plugins base on that role?
  26. plugin class inheritance. cannot change variable
  27. Easiest way to add dropdown to a page
  28. WordPress web pages keep getting deleted (moved into the trash) by themselves
  29. Run plugins only on certain pages
  30. (FES EDD) New vendor submission page is blank
  31. Merging Two menus in the backend into one menu
  32. Using plugin functions/methods within templates
  33. Delete mobile menu button [closed]
  34. Dynamic admin submenu
  35. How to handle cookies from a WordPress plugin on a cached page?
  36. accessing parent variables in child construct without executing action in parent
  37. Custom Permalink Plugin and Current Page/Ancestor in Menus
  38. How do I write an inventory list plugin that creates dynamic details pages?
  39. wp-custom-menu filter removes the current_page_item class
  40. Can I allow certain people to add/edit pages within a parent?
  41. add_action does not call the function
  42. Redirect to another page using contact form 7? [closed]
  43. Display Custom Field Value on Admin Page Column
  44. How to prevent PHP fatal error if plugin hasn’t been enabled and a method is called in theme file?
  45. Thesis 2 custom Page
  46. Simulating a wp page – wp page load sequence
  47. profile_update hook doesn’t works inside a class
  48. Need to revert to an older version of wordpress
  49. Plugin: Hooking up classes that have their own hooks
  50. Get post content from outside the loop with plugin shortcode usability
  51. WordPress Custom Menu Admin helper plugin
  52. Custom form not showing in correct place on page
  53. 2 wordpress site same database
  54. Use jQuery Datepicker code from plugin
  55. How to force load a page in plugin?
  56. Dropdown menu on click change
  57. How do i specify a url to which to redirect the user after he logs out from facebook?
  58. Is there a syntax highlighting plugin for HTML View? [duplicate]
  59. What is the best way to make a custom page from a plugin?
  60. Setting text widget to one page only
  61. I cannot include a file in my plugin settings page
  62. Gantry Framework: new page loads homepage content instead of page content
  63. How to permanently show Word Counter on Create/Edit Page. WordPress5.9.3
  64. Displaying page content from plugin, inside exising empty WP page
  65. Oops! That page can’t be found
  66. Copy/paste local images not working in WordPress
  67. Elementor: How to design Dropdown Select Box Navigation page like Chegg
  68. FPDF for creating pdf diplomas
  69. Adding LOAD MORE on a page
  70. What plugin would make this happen? If is the theme
  71. WordPress site hamburger menu toggle not working
  72. How to allow URL with filename & extension in wordpress?
  73. Scroll to ID broken in main menu
  74. Get post content inside plugin class method
  75. Enabling plugin on specific pages and subpages
  76. jquery plugin won’t fire when hamburger class element clicked
  77. Python in WordPress – A “Hello World” implementation
  78. How to access classes in theme of a plugin?
  79. Sub Categories in drop down menu
  80. Wordress admin page is fetching error You do not have sufficient permissions to access this page.
  81. Admin page and admin menu. Permissions plugin
  82. Options page textarea to populate custom post select field
  83. WordPress menu and plugin installation problem
  84. Power Menus plugin destroys menu after adding new item
  85. Best way to create member pages for a lab website? [closed]
  86. Creating a page that does not show up in the frontend navigation bar
  87. Fatal error when accessing Pages in WP admin (and problems editing any pages)
  88. add_media_page function not creating submenu
  89. How can I pass value to function in add_menu_page?
  90. Why function hooked using object are executing at all time?
  91. Create a blank admin page from plugin
  92. Multiple Plugins Interacting with Menu
  93. private functions in plugins
  94. How to make only selected posts appear on a selected wordpress page
  95. How do I add custom fields to the “Edit page” admin screen?
  96. Strict Standards: Non-static method in sidebar generator
  97. How to make horizontal scrolling menu [closed]
  98. Function not being called on form submit, only blank admin-post.php page
  99. WordPress Plugin and other pages not opening
  100. Set the Social Icon Size in footer