Why does my visual post editor break when I try to add a TinyMCE button?

Well, here’s what I found. It doesn’t quite explain why the editor was breaking, but it does explain how to add a button properly, without breaking the editor.

The PHP code I was trying to add to functions.php actually needed to be added as a plugin. Combining directions from this StackExchange post and this tutorial, I created a WordPress plugin containing the PHP given in the second link. I also followed the tutorial’s directions to create a shortcode.js file, which I uploaded to my custom plugin’s folder. I activated the plugin via my Dashboard, and it added a working button!

When I follow the directions I originally found and add the PHP functions as a plugin, not edits to functions.php, it also works.

Looks like using plugins, not functions.php, was what it took to make it work.

Related Posts:

  1. Can I remove the Rich Text box editor for a specific post?
  2. Tiny MCE-modifications (plugins) stopped working in WordPress 5.6
  3. Remove heading tags on line break
  4. Unregistering custom tinymce plugin?
  5. get_template_directory_uri pointing to parent theme not child theme
  6. How to customize the_archive_title()?
  7. How to override parent functions in child themes?
  8. remove_action on after_setup_theme not working from child theme
  9. Adding a second email address to a completed order in WooCommerce [closed]
  10. Child theme – Overriding ‘require_once’ in functions.php
  11. Include files in child theme functions file
  12. Redeclare a function in a child theme
  13. How to override a function when isn’t at functions.php
  14. Child theme functions.php do I use php open and close tags?
  15. Disable visual editor on one specific page
  16. Declaring an instance of class included in parent theme from child theme functions.php
  17. TinyMCE custom styles remove class when switching styles
  18. One Child Functions.php for Multiple Child Themes
  19. Removing custom background and header feature in child theme
  20. How to override function in functions.php of parent theme?
  21. Implementing DNS Prefetching with WordPress
  22. override parent theme configuration in child functions.php
  23. Child theme – overriding add_image_size by a child theme [duplicate]
  24. syntax for remove_filter in parent theme with class
  25. Is it possible to override this function/class in a child theme?
  26. How to override functions.php in child theme?
  27. Overriding core functions in child theme
  28. TinyMCE custom stylesheets for different post types
  29. Override parent theme function that is not hooked or in the functions.php file
  30. Function in Child Theme not overriding Parent Theme function [duplicate]
  31. Change parent theme file function in child themes functions.php
  32. Adding extra SVGs to TwentyNineteen child theme using class TwentyNineteen_SVG_Icons
  33. Reuse variable in hook callback
  34. Child theme – copied some files from parent to child website still uses parent files
  35. How to override filter in child theme?
  36. I created a child theme and it doesn’t work for some of the css files
  37. add sidebar area to header of child theme
  38. Unregister Nav Menu with fallback?
  39. Child Theme Not Overriding Parent Theme
  40. Changes to functions.php not working
  41. Overriding methods in a child theme
  42. How to override enqueued styles using a child theme
  43. Should I ask a theme developer to use locate_template rather than require_once
  44. Using the child theme functions.php to change the customizer.php on parent theme
  45. Child theme functions.php not executing
  46. How to store / access files in child theme folder
  47. Make “sidebar template” the default template for new pages
  48. override parent theme configuration in child functions.php
  49. wp_enqueue JavaScript in child-theme (ReferenceError) using Search & Go
  50. Overwrite Parent Theme add_image_size in Child Theme
  51. Proper way of using functions in action hook?
  52. Twenty Eleven Child theme error when attempting to use a rewritten function
  53. How do I get a child theme to load scripts from the parent theme?
  54. how to edit functions.php in a child theme
  55. Best practice when altering a parent theme function inside a child theme?
  56. How to make child theme inherit parent custom theme options [closed]
  57. Include files in child themes, declare in functions.php
  58. How to remove set_post_thumbnail_size() in child themes?
  59. Avoid loading css from parent theme
  60. Creating a child theme – functions.php code issue
  61. Echo tags used to describe the theme
  62. Overwriting Parent Theme’s Image Sizes
  63. Child theme within a child theme?
  64. Problem only while using require_once() within functions.php
  65. How can I change a function in a parent theme via a child themes functions.php
  66. Twentyten Child Theme: header images display messed up in admin panel
  67. Add other social networks to TwentyNineteen_SVG_Icons class in child theme?
  68. Why is functions.php file in child not initializing and over-writing parent?
  69. Please Explain the Importing Process of Multiple Stylesheets for Child Themes
  70. Reuse variable in hook callback
  71. Automatically include all php files in a child theme directory
  72. Override the function twentytwelve_scripts_styles in a child theme
  73. Adding a colorbutton in tinymce dialog with current api
  74. Add custom function to a theme with child theme’s functions.php
  75. Pagination in relation to archive.php
  76. Skeleton Child Theme Add Icon Bar to Header Flex Grid
  77. How to load parent theme template parts in child theme
  78. Javascript function not working when placed in Text Block
  79. Custom styles.css sheet for visual editor
  80. Running script based on Category
  81. How would I go about replacing this function in my child theme located in inc/template-tags.php
  82. Enqueuing latest version of jQuery into a child theme returns a blank screen
  83. Load custom css in functions.php causing library issue
  84. Not all CSS elements transferring via parent to child?
  85. Disabling visual editor on a specific post
  86. Dequeue script to prevent javascript event conflict on wordpress child theme
  87. Return child theme url
  88. Got white blank page after copying the functions.php to child theme
  89. How do I change a parent theme’s function through the child theme?
  90. How to edit classes in body tag?
  91. Can’t locate custom image sizes defined by child theme
  92. Randomizing wp_tag_cloud() in child theme
  93. Add back in child theme what the parent theme removed with remove_action
  94. Can’t switch to a child theme using filters template, option_template and option_stylesheet
  95. Where do I go to edit this area? [closed]
  96. How to include any template using Shortcode fuction?
  97. Parent theme styles overriding child theme CSS [closed]
  98. overwrite code snippet from parent to child theme
  99. WordPress wraps span tags into p tags
  100. Unable to point the child theme directory even using get_stylesheet_directory()
Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)