wp_dropdown_categories and custom attribute

The only filter available is wp_dropdown_cats, which allows you to filter the entire HTML select string and that means trying to string-match markup. That is always a bit questionable. Still…

function dropdown_data_attr_wpse_213033($output){
  return str_replace('<select','<select data-live-search="true"',$output);
}
add_filter('wp_dropdown_cats','dropdown_data_attr_wpse_213033');
wp_dropdown_categories(); // test

Related Posts:

  1. Add multiple custom fields to the general settings page
  2. When should you, and when should you not, use wp_list_pluck()?
  3. Is it possible to remove the “standard” post format?
  4. Woocommerce add to simple product attribute programmatically [closed]
  5. Issue with get_theme_mod returning a blank value instead of the saved value
  6. How to remove row-actions from pages table?
  7. Modify search function in WordPress (TwentyTwelve)
  8. How to customize search result page title?
  9. Auto delete WordPress images/thumbnails (all sizes) and featured after X days/hours, or similar?
  10. How to fix a theme with page.php Default Template that accidentally deleted?
  11. How do I change parameters without changing the core
  12. Problem with extract() with custom shortcode
  13. add sidebar area to header of child theme
  14. Custom function for user register in wp?
  15. Theme-Config tab in admin Pannel?
  16. Creating loop within functions.php
  17. How to Add a Random Custom Gravatar in the WordPress Comments?
  18. adding custom classes for tables
  19. Pass Shortcode Attribute to footer Script
  20. How to mass-delete inline styles in WordPress custom post type automatically?
  21. Remove the deleted users avatar from list
  22. Customizer field value into functions.php variable
  23. PHP files included in functions.php don’t seem to work
  24. How Can I Expand the WordPress Customize window without any Plugin?
  25. Set quantity of woocommerce product on page visit [closed]
  26. str_replace function in theme
  27. Automatically wrap multiple images in div
  28. Ajax not working properly
  29. Include default functions and methods
  30. How can I remove the main description text box in a Woocommerce product editor page? I only use the “Product short description” text box [closed]
  31. How can I modify all existing tags while keeping the urls themselves?
  32. Best practices regarding the creation of custom widgets?
  33. Unable to login using username
  34. Word Press – Dynamic Content [closed]
  35. how can I just add to parent theme function(s) instead of redeclaring whole the function
  36. different style sheet for just one page template
  37. Condition OR for current user ID
  38. How to retrieve the current post’s generated featured image size?
  39. Custom Behavior when Adding New Custom Post Type in Dashboard
  40. Where do I store custom functions that call custom page template files?
  41. Why There Is No “get content by ID” Function
  42. Wp-query Order By problem
  43. Randomizing wp_tag_cloud() in child theme
  44. login_headertitle is deprecated since version 5.2.0
  45. Where do I go to edit this area? [closed]
  46. Replace plugin function with a custom function?
  47. Add attribute only to first image of every post via functions.php
  48. Different favicon on different pages
  49. The_content and Preg_replace in loaded Iframe [closed]
  50. Problem with images URL after filter applying
  51. two search forms on the same page
  52. Insert a field with PREG_REPLACE – strange behaviour
  53. How to echo Widget Title in Custom Frontend-Template Box
  54. how to display a page before the home page
  55. loginout function customization
  56. Function to check if custom page is used by page?
  57. implementing a centralized content “show-do-not-show” toggle?
  58. How would I make a function to dynamically determine if user is logged to change navigation menu text?
  59. How to display this meta data (an array) in form of a function (created with a custom write panel)?
  60. WordPress – using sessions?
  61. How to remove font awesome from loading in wp theme
  62. Header menu aligned right on all pages except for single-post page [closed]
  63. Save_post – Warning: Cannot modify header information
  64. How to use WP conditional tag in a functions.php with OCEANWP Theme?
  65. Modifying a WordPress Plugin
  66. CF7 select value get to function and reciept value from function
  67. Hide author info in single posts by certain users
  68. Extend WordPress Audio Widget to accept HLS (.m3u8) URLs
  69. Shortcode to insert default text and change one word throughout it?
  70. How Can I Concatenate A String With One Of My Custom Field Value Before Saving The Post?
  71. Woocommerce custom calculation function
  72. Remove all video attachment, both files and post/postmeta from database?
  73. WordPress Ajaxifying not working properly
  74. WordPress function with attribute pass to template
  75. Will dequeueing in child theme functions.php file prevent Google Fonts from loading?
  76. Replace image attributes for lazyload plugin on image elements with specific class
  77. Adding A New Widget to WordPress Disables the Existing Widgets
  78. Help! Need a different logo on my main page from my other pages
  79. Display page number on custom page title function
  80. How to make an If Else on Excerpt Filter
  81. How to replace words in my posts and saved new words
  82. How do I integrate my Child Theme into a Custom Template?
  83. Shortcode to eliminate and replace with
  84. Add functionality to post editor
  85. custom post with loading script per single post
  86. functions.php / replacing div’s with new ones?
  87. Why does modifying my functions.php file always result in a server error
  88. Post variables not displaying correctly in custom function
  89. Remove snippets of JS from core
  90. Removing Facebook contact field from user contact not working
  91. Explode Array from Repeatable Custom Field
  92. WordPress Custom wp mail template return full template
  93. How to crop image in WordPress with aspect ratio for any size of image
  94. post_row_actions filter from parent theme not executing in child theme
  95. Customizer cuistom CSS Priority ordre Issue
  96. Copy and Modified WooCommerce function is_coupon_valid [closed]
  97. BuddyPress Edit activity function good practice
  98. wp_login_form display no styled form
  99. Advanced Custom Fields in WP_Query: Clickable Text in List Format
  100. Add custom css to specific user