Custom meta box shown when template is chosen [duplicate]

I know that the plugin Advanced Custom Field does that.
Checking its code, I saw that he deals with this issue using jQuery.
Using it as reference, I think this should work for you:

/* 
 * Change Meta Box visibility according to Page Template
 *
 * Observation: this example swaps the Featured Image meta box visibility
 *
 * Usage:
 * - adjust $('#postimagediv') to your meta box
 * - change 'page-portfolio.php' to your template's filename
 * - remove the console.log outputs
 */

add_action('admin_head', 'wpse_50092_script_enqueuer');

function wpse_50092_script_enqueuer() {
    global $current_screen;
    if('page' != $current_screen->id) return;

    echo <<<HTML
        <script type="text/javascript">
        jQuery(document).ready( function($) {

            /**
             * Adjust visibility of the meta box at startup
            */
            if($('#page_template').val() == 'page-portfolio.php') {
                // show the meta box
                $('#postimagediv').show();
            } else {
                // hide your meta box
                $('#postimagediv').hide();
            }

            // Debug only
            // - outputs the template filename
            // - checking for console existance to avoid js errors in non-compliant browsers
            if (typeof console == "object") 
                console.log ('default value=" + $("#page_template').val());

            /**
             * Live adjustment of the meta box visibility
            */
            $('#page_template').live('change', function(){
                    if($(this).val() == 'page-portfolio.php') {
                    // show the meta box
                    $('#postimagediv').show();
                } else {
                    // hide your meta box
                    $('#postimagediv').hide();
                }

                // Debug only
                if (typeof console == "object") 
                    console.log ('live change value=" + $(this).val());
            });                 
        });    
        </script>
HTML;
}

Related Posts:

  1. Choosing a default page tempate (Classic => Gutenberg)
  2. Hide Page Title with Post Meta
  3. The $post variable – Did I get the grasp of how the Backend actions get parsed?
  4. Add metabox to pages that use custom template in WordPress
  5. How to set default screen options?
  6. Add “upload media” button in meta box field
  7. Does WordPress have a “Form API”?
  8. Metabox with checkbox is not updating
  9. Best practices for meta box placement?
  10. Hiding a theme’s meta box
  11. Block metabox – No expanding, no moving around
  12. add_meta_box does not go ‘side’
  13. Getting jQuery sortable items in custom metabox
  14. Adding uploaded images to editor from metabox instead of default popup uploader
  15. How do I stop HTML entities in a custom meta box from being un-htmlentitied?
  16. meta content on required pages
  17. How to remove the RichText Meta Box
  18. get_post_meta doesn’t work
  19. Add character count to custom metabox
  20. Update caption for metabox gallery images
  21. Dynamically Creating Meta Boxes
  22. Remove border on custom meta box
  23. Create a page Meta Box listing all blog users
  24. datetime_timestamp shows numbers only? need in date and time
  25. remove_meta_box for all post types doesn’t seem to work
  26. Custom Metabox with Ajax in Edit Post – Stuck
  27. Post.php – Conditional statements for new post and edit post
  28. make a excerpt on data from a meta box?
  29. How to put Periods and Spaces for Array Values (Meta Key)
  30. How to verify meta box is registered in Unit Testing?
  31. Add_meta_box not appearing, but does appear in screen options
  32. Change the post date from a meta box
  33. update_post_meta and get_post_meta not working
  34. Customize WordPress Media Upload and New Media Manager Menu in add post Metabox
  35. Repeatable custom meta fields
  36. Get all meta boxes values
  37. How to display a custom post type’s media library inline on meta box
  38. Modules with meta box implementations
  39. Metabox saves on Update or Publish, but not on Saving Draft
  40. Remove meta box for specific page
  41. Checkbox on a meta box using CMB2 Plugin
  42. Visual/Text tabs in wp editor Not Showing
  43. Decide Metabox Configurations for All Users
  44. metabox select – frontend display
  45. save_post action to include wp_insert_post_data filter, gathering meta field info & prevent infinite loop
  46. Set default post author to none on new post
  47. Change the context of excerpt metabox for the ‘New Post’ page
  48. how to save and get selected item id list with add_meta_box
  49. How to have meta boxes save via REST in Gutenberg?
  50. Remove anchor tag from meta box link
  51. Show preview of post changes on page
  52. Add Metabox to settings / options page
  53. Undefined index error in custom post metabox
  54. WPAlchemy MediaAccess inserting media link in WP Editor instead of custom field in metabox [closed]
  55. Meta Box will not display
  56. cannot grab post meta from extended Walker_Category class properly
  57. Resetting admin post form on JS validation fail
  58. How do you List all Sidebars in a Metabox
  59. Create more Meta Boxes as needed
  60. Add a meta box to ALL Pages
  61. How can i use this meta box function in my template ? (WordPress)
  62. How to disable Author dropdown in Gutenberg’s Status and Visibility panel
  63. How to remove some metaboxes for CPTs?
  64. How to add metabox ONLY to specific WooCommerce product type [closed]
  65. Why does not my metabox save?
  66. Add metabox without the container
  67. wpalchemi metabox doesn’t show value from my post type
  68. HTML Table creator in metabox to put into post theme
  69. Display stored value in Meta Box
  70. How to use Gutenberg in CMB2?
  71. How to add meta box for current post format?
  72. How to check specific value in two metabox?
  73. How to show taxonomy terms from wordpress database?
  74. How can i get multi checkboxes value in metbox?
  75. Understanding WordPress’ post type support
  76. wordpress alchemy put custom metabox on certain page only
  77. using WPalchemy to output custom metabox from homepage template
  78. save radio button selection in post-meta on submit
  79. ShortCut on meta boxes
  80. Post edit screen: How to check if meta_box is registered?
  81. How to ‘clone’ select metabox options with a callback function? [closed]
  82. Saving multiple fields (dropdown and text) in custom metabox
  83. save meta data of custom post type: WP_Error has no effect, even if insufficient capabilities
  84. display all registered meta boxes
  85. where can i see the registered new field for posts using register_meta() ?
  86. update_post_meta doesn’t work
  87. Only allow one meta key value per post in a category
  88. Ridiculous problem with CDATA [duplicate]
  89. Can’t save drop down select date in meta boxes
  90. WordPress check if value equals and echo “checked”
  91. Custom metabox for file upload return empty filename
  92. Video slideshow
  93. Meta Box Value not saving / populating?
  94. How to set default screen options?
  95. Reload meta box content with AJAX
  96. Option to delete value in metabox
  97. why esc_url not working in smartmetabox
  98. Change Default Custom Fields Metabox Name on cctm plugin
  99. Form submit from modal window to parent window
  100. Allow iframe in custom meta box

Leave a Comment