Add “selected” class to custom taxonomy dropdown search

$seach_values can be changed whenever the site redirect, be sure that $search_values still keeps the input values from your search form.

To be sure I suggest use GET or POST to pass the values from form. So, your comparing statement should be 

$_GET['grades'] == $term->slug

Here I suppose your search form use method="GET"

Related Posts:

  1. Custom Taxonomy Tag Search
  2. Limit Number of Taxonomy Terms (Images) Displayed
  3. Want wp_get_post_terms return in arbitrarily order, how to do?
  4. List taxonomy terms for post as checkboxes
  5. Ordering taxonomies by rank
  6. Getting taxonomy images to display on single-post with their terms
  7. Where to populate custom terms in custom taxonomy in plugin?
  8. wp_insert_term() doesnt insert a term
  9. Smarter navigation plugin and custom taxonomies
  10. Only return taxonomies that are linked to a category & product
  11. Why is my custom taxonomy image not displaying?
  12. Get only selected custom taxonomy
  13. Get custom term link archive with prefix
  14. Create a custom taxonomy’s term form
  15. Search Everything plugin integration
  16. AJAX search posts and pages
  17. ‘No Results Found’ on single post for custom post type
  18. Search for categories
  19. auto populate list of questions if user select a category xyz
  20. How to Display Taxonomy Custom Meta Box Data in Archive Page?
  21. Why Is This Code Causing The Admin Bar to Disappear?
  22. How to set taxonomy in custom plugin?
  23. WP_Terms_List_Table Quick Edit not working
  24. “Custom Post Type Permalinks” plugin URL strcuture
  25. AJAX search as you type? [duplicate]
  26. Plugin generated taxonomies’ permalinks with custom placeholders
  27. WooCommerce search products between price range using WP_Query
  28. Template filter for custom taxonomy terms
  29. Search Query for Multiple Terms In Same Taxonomy
  30. Checking if a woocommerce attribute is set
  31. ‘Organize Series Plugin’ as muti author feature
  32. WordPress custom taxonomy not showing
  33. Send admin an email when a user’s search has no results
  34. Integrate Algolia to WordPress site
  35. How to multiply a post to test internal search results?
  36. Default taxonomy template in plugin, override in theme
  37. How to display terms and conditions in post area?
  38. How to set “split_on_numerics” to false in ElasticSearch mapping using ElasticPress? (for proper SKU search in WooCommerce) [closed]
  39. Woocommerce Backend Search by Title and SKU
  40. Search and Filter Plugin – How to disable redirection
  41. WordPress Multi-Step Product Search
  42. Search by Attachment ID
  43. How to get CPT category checkbox list and show post of selected(multiply) checkboxes via ajax?
  44. Custom search search does not work?
  45. Renaming Custom Taxonomy Values
  46. Creating a search form and displaying results
  47. Exporting Custom Taxonomy in plugin
  48. Installed Forca Theme, wonder how I can alter Post editing screen
  49. Is it save to replace with in WordPress search form
  50. Plugin for a static piece of text on homepage
  51. Include get_term_link inside search
  52. Rename existing cpt and taxonomy with new textdomain
  53. how to create hierachial taxonomy and manage under single post type?
  54. WordPress search shows protected content
  55. Get product categories and add them to a custom taxonomy
  56. Best approach to make all tags searchable by the wordpress search function
  57. Need to edit author permissions | custom taxonomy
  58. How to search post titles with whole words only, but not the exact word only?
  59. RSS feeds for specific topics
  60. How to add the search page link to the anchor tag?
  61. WC Fix Attributes – ‘Add New’ Not Searchable/Delayed
  62. Adding category base to url in custom post giving 404?
  63. Display posts by alphabetical order
  64. How to hide an option from dropdown in filter module
  65. WP search box on page not finding .PDF files
  66. Redirect to a page while maintaining search query parameters without causing an infinite loop
  67. Rewrite/Change custom taxonomy slug
  68. Search results to point to specific section?
  69. Custom Taxonomy is Missing (Or Limiting) Items
  70. Search in WordPress
  71. Cannot view Custom Post Type no matter what I try
  72. Content disappears when searching with Search & Filter plugin
  73. How to create meta fields with more than 1 relation?
  74. How to exclude a part of a page in search results
  75. Accounting for search terms that may include a space, using SearchWP
  76. how to add navigation icons in specific template?
  77. Show custom taxonomy in theme
  78. multiple string replace of post’s content for large data
  79. How can I make the search bar in my wordpress site search all of the pages rather than just the blog posts?
  80. Taxonomy question
  81. Taxonomy Category Icon on index page
  82. How to make wp multisite subdomain exist search
  83. Remove Url Parameter WordPress
  84. How can I remove this sidebar from my Search Results page?
  85. History of page, interval of years
  86. Include post_date in search
  87. How to order users alphabetically by name? in plugin UPME
  88. How to hook into search results template or query?
  89. WordPress Search return wrong results
  90. “Tree view” for wp_dropdown_categories() markup
  91. Save selectlist value (taxonomy) in wp:wp_set_object_terms
  92. Differentiate attachment pages in search results
  93. Is saving multiple options or saving multiple items in one option better?
  94. Show similar category portfolio items?
  95. CPT-onomies CPT_TAXONOMY->get_terms extremely slow with 6K posts
  96. Can’t pull metadata for a term in my theme’s function.php
  97. Is there any simple wordpress search template that works with existing searchforms?
  98. Extend WordPress Search
  99. how to sort results by last day update at search result in plugin installer?
  100. Find And Add Category to Posts
Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)