How can template identify what page it’s being used on?

Idea #1 is correct if your template use body_class() like

<body <?php body_class(); ?>>

In this case the body tag will be something like:

<body class="page page-id-6 page-template-default">

If the id of viewed page is 6 and template used is the default.

See Codex

However, in pages the global $post variable is available even in the header and before calling the_post(). So $post->post_name will contain the slug of your page and you can make use of it as you want.

Related Posts:

  1. How to get IDs for objects in menu branch?
  2. Show only 2nd level of navigation depending on active navigation
  3. Remove navigation from header in custom page template
  4. How to retrieve depth of menu into template
  5. Output menu navigation in php file
  6. How to make the Primary Menu stay the same in the PC and mobile versions of the Twenty Sixteen theme
  7. Change submenu markup
  8. How to modify wp-includes without messing my wordpress installation?
  9. WordPress template – How to add class to li tag if submenu exist
  10. How can I switch pages?
  11. Add a submenu to wp_nav_menu
  12. Automatically going to the first page in a hierarchy?
  13. How to add search to menu?
  14. Is it all right to put the whole tag into template_part file?
  15. Create link/button to create new post using specific template
  16. wp_nav_menu doesn’t show on index page
  17. Setting up menus before making a template live
  18. Display a portion/ branch of the menu tree using wp_nav_menu()
  19. Display only page specific sub menu items using Custom Walker
  20. non-clickable placeholder in the menu
  21. Ways to give a wp_list_pages menu link specific class names?
  22. I want remove last after wp_nav_menu
  23. Add log in link to menu in Twenty Twelve
  24. Organizing by super-categories (or nested categories)?
  25. Adding first and last class to Menu on top level only
  26. wp_list_pages – show pages immediately 1 level below current level
  27. Add within the output of
  28. How do I get my wp_nav_menu single category page to highlight the parent?
  29. Where to update the Static Pages Blacklist for Multisite Install?
  30. Vertical Sidebar Menu Parent and Child not displaying correctly [closed]
  31. Hide Menu items base on capability
  32. How to show Home Page link in WordPress Menu and how to add an icon to this?
  33. How to add custom menu item on plugin activation?
  34. Outside the loop, how can I echo the current page’s menu title?
  35. Use menu class in walker function
  36. Menu link to all posts (all categories included)
  37. How do you return a menu with the menu name?
  38. do_action appearing outside of menu?
  39. You do not have permission to create Navigation Menus – Twenty Twenty-Two theme
  40. Walker class conditional based on parent menu item label or custom css class
  41. Creating a navigation menu to see where you are on your website
  42. Custom format nav menu only using div and a
  43. ‘wp_get_nav_menu_items’, when fired inside of the ‘wp_update_nav_menu’ hook, returns old menu items, instead of new
  44. Sticky Header in WordPress using BootstrapWP theme [closed]
  45. Walker Class – Check if menu item has description and if so add class to li
  46. Multiple languages menus problem
  47. Switch from hover to click on Twenty Twelve Menu
  48. How to override menu markup?
  49. How to remove dropdown from wp_nav_menu
  50. Is it possible to add a dynamic link in the main navigation in a child theme
  51. How to change menu structure?
  52. Insert a div class inside wordpress menu
  53. Retrieve Menu name for nav_menu_item
  54. Edit the (automatic) HTML layout of nav menus
  55. How to make wordpress nav menu use post custom meta data
  56. Is it possible to make the heading on a page different text to the text of the menu item?
  57. How to Structure Pages and Subpages
  58. Add custom path to url to specific pages
  59. CTA button that is only visible to some of my users
  60. How do add a menu with levels within page [closed]
  61. Hide menu item when users are logged in/out
  62. add another html tag after li element in wp_nav_menu
  63. How do I change/remove styling (top border) on main menu for active page and hovering (Avada Theme)
  64. How to add scroll IDs to WordPress menu anchors
  65. WP nav menu + Bootstrap, add role=”menu” to UL
  66. Display pictures instead of text in menus
  67. how to check if given page is active page
  68. how to set the link in wordpress such that on clicking it doesn’t open another page but go to the bottom of same page
  69. custom walker class for own menu?
  70. WordPress Menu – creating a fake link [closed]
  71. Add a menu metabox to post edit page
  72. Setting or plugin for showing submenus horizontally under the main menu, and keep them after selection
  73. New wp menu menu styling
  74. (Mobile) Hamburger menu disappeared from a page (only one)
  75. Add div content to my already existing menu
  76. Hiding menu on specific pages
  77. Bootstrap Menu bar shows up a toggle in Desktop Mode
  78. For a menu custom link (without a link) a “#” is appended. Can this just be blank, i.e. NO link?
  79. sidebar navigation problem with child pages not all display.?
  80. How to point menu to my homepage
  81. save_post() on Menu Save
  82. dot.com/car1 does work, but dot.com/transport/car1 doesn’t work
  83. code to add an extra selection to the menu editor
  84. update_post_meta breaking wp_update_nav_menu_item
  85. Building a menu from a large number of pages?
  86. Accidental reverse order of menu items in one menu
  87. How to call a certain object/menubar in a PHP file
  88. How do I remove a menu from a theme?
  89. Access CSS Classes specified in Menu options
  90. How to output the menue structured for tabbed navigation?
  91. Walker for menus
  92. Custom Menu based off custom header
  93. Remove “Next Post” in nav_menu
  94. Adding an additional menu in WordPress
  95. Making current_page_item work with wp_list_pages in sidebar on post pages
  96. Menu not Showing on Mobile or While the page is shrinked
  97. My Menu Disappears on my Custom Link Homepage on Mobile
  98. How to centre menu items on horizontal nav bar? (e.g. make margins equal) [closed]
  99. Add A Menu Item To A WP_Nav_Menu Navigation via PHP Function
  100. Database structure Menu Item