Custom plugin giving: wp-admin/admin-ajax.php 400 (Bad Request)

As Jacob Peattie mentioned this issue was occuring on logged out users and his suggestion of hooking wp_ajax_nopriv fixed the issue:

add_action('wp_ajax_nopriv_plugin_prefix_page_change', array($this, 'plugin_prefix_page_change'));

Related Posts:

  1. Custom plugin giving: wp-admin/admin-ajax.php 400 (Bad Request)
  2. How to create popup same as wordpress popup feature
  3. Ajax, jQuery and WordPress
  4. Load css classes after using ajax calls
  5. AJAX Call Via Vanilla JavaScript In WordPress Plugin Development
  6. Ajax call doesn’t work in frontend but it’s working in backend (when I’m logged in)
  7. Why is my ajax call refreshing the page?
  8. How do I use WordPress PHP functions in my Javascript code?
  9. Admin-ajax.php is dying “0” without processing function
  10. Only execute jQuery function(on document ready) on the page has shortcode from plugin [duplicate]
  11. Check if email address exists front end with AJAX in a plugin
  12. Best approach to fetch data from wp options to js file or php file
  13. Ajax contact form widget plugin data not insert in database
  14. wordpress add_action() issue in ajax call
  15. Ajax request sends url rather than data
  16. wc_get_template_part doesnt display the content [duplicate]
  17. Jquery POST Ajax Return null data in wordpress
  18. How to properly enqueue jQuery knob on WordPress without conflict?
  19. Ajax Call not Working in Plugin
  20. JS working when used normally but not in wordpress
  21. AJAX update fails for public/non-admin users
  22. WordPress Ajax request “Failed to load resource: the server responded with a status of 400 ()”
  23. WordPress ajax error 400 bad request for sending data to remote site [duplicate]
  24. Overwriting Plugin’s Ajax callback function from theme
  25. Javascript in plugin not working
  26. How to limit each front-end user to view just his own uploaded files on Amazon S3?
  27. WordPress ajax not working in registration
  28. How to get site homepage from plugin?
  29. get_option include in my adsense
  30. Ajax in Plugins: returns the whole page
  31. Jquery post responses 500 error after some time and lastly an 503 error
  32. What’s the preferred method of writing AJAX-enabled plugins?
  33. force enqueue script to be first in order of prominence
  34. Editor not displaying dynamically after clicking on the button
  35. How to fetch serialized data from wordpress options
  36. How to save Clicks of a download link button while it doesn’t matter if we refresh the page or again login/logout
  37. ‘Lazy loading’ list of posts with pagination
  38. How to Reload the Dashboard After Clicking Update in Quick-Edit?
  39. How to include admin-ajax when loading external javascript
  40. How to remove an Ajax action
  41. Has anyone used require.js for handling plugin scripts?
  42. Passing RichText attributes to function onChange
  43. jQuery function didn’t work in my plugin
  44. JQuery not working in my plugin [closed]
  45. WooCommerce get_price returning wrong price when used via ajax
  46. How to test nonce with AJAX – Plugin development
  47. How to load plugin after page is loaded – pagespeed issues
  48. Pulling data from custom plugin settings using PHP shortcode and Javascript
  49. Form isn’t inserting data into database with ajax plugin
  50. AJAX search posts and pages
  51. Updating the Drag-To-Share eXtended share URLs?
  52. Best place for if/else piece of code related to custom plugin?
  53. wp.media javascript issue with on select
  54. jQuery for custom plugin not working with Divi theme
  55. WordPress + JavaScipt + AJAX + MySQL: insert query for form
  56. How to load wp_editor via AJAX
  57. Redux Framework: Page freezes on typing in Editor
  58. How can I inject options into an select tag inside the widget form?
  59. Create shortcode to echo javascript
  60. how to insert data in wordpress table usnig jquery ajax
  61. Redirect to another page using contact form 7? [closed]
  62. Admin AJAX doesn’t work in plugin admin page – Even though code is copied verbatim from WordPress Codex
  63. AJAX fileupload – TypeError: not a function ajaxSubmit()
  64. Using WordPress to build membership Page
  65. How to generate an all in one WordPress New content, plugin and theme update report on a website? [closed]
  66. How to use custom Javascript code inside a plugin?
  67. JQuery needs to be defined in , but Gravity Forms is defining it in the
  68. How do I make sure that my plugin only runs on article detail pages?
  69. WordPress API functions not working at AJAX functions.php call
  70. Calling a class method instantiated by ajax call in wordpress [closed]
  71. Set Button in PluginDocumentSettingPanel Content (WordPress Gutenberg)
  72. How do I reinit WordPress plugins dynamically using jS?
  73. login form should redirect to register page for in 1st login next time it should redirected to home page
  74. Error datatable whit ajax
  75. Fixed: Console.log twice in the edit function
  76. Trouble with AJAX using GET
  77. Get the link title attribute and send it google analytics as custom label via google tag manager using beehive pro for WordPress
  78. Calling PHP function with AJAX
  79. Create a form and have custom menu display based on user answers?
  80. How to solve Blocked a frame with origin from accessing a cross origin frame error in wordpress?
  81. Overwrite js code using WP_Footer
  82. How to use information from the database in the front-end?
  83. Storing Array of values into wordpress options
  84. WordPress environment not loading properly
  85. How can I use wp_ajax_response for front-end error reporting?
  86. WordPress Feedback popup with date saved into table
  87. Not getting result using ajax on wordpress
  88. Creating a user ‘add custom field’ section
  89. Javascript not working
  90. Need to hide an element depending on date and post category
  91. AJAX doesn’t pass variables to the php function in the plugin
  92. How do I convince this button to do something when it is clicked?
  93. Is it possible to run javascript on plugin deactivated?
  94. How do I output user_registered time in my correct timezone?
  95. FacetWP: Plugin breaks button/modal functionality inside searchable content area
  96. TypeErrors with Yoast, jQuery in conflict?
  97. Count div with class (.length) only shows 0 [closed]
  98. How to access values from your own settings page in javascript?
  99. How do I call an action hook into wp_ajax hook callback function
  100. Select posts from list and add them in a new list