在wordpress帖子中“在运行中”创建元字段

Question

Is there any way to have a registered meta box dynamically appear numerous times based what is selected/entered in another meta box or taxonomy field?

i.e. my custom post needs to have a variable amount of "sections" (text fields). There would be no way for me to pre-define how many that would be; only during data entry can that amount be known. These fields would then be also dynamically added to the post template on display.

Answer 1

After registering my custom post also called post and a metabox with callback "display_post_meta_box" this worked:

function display_post_meta_box( $post ) {

        // Retrieve current details of the post based on post ID    
    $section_number = get_post_meta( $post->ID, 'section_number', true ) ;  
    /*Configuration for post section WYSIWYG editors*/
                $i = 1;
                while ($i <= $section_number) {
    $section_editor_settings[$i] = array(  'textarea_rows' => '5','media_buttons' => false, 'textarea_name'=>__( 'post_section'.$i ), 'teeny'=>'true' );
    $i++; }



        // Retrieve current details of the post based on post ID
    $section =  get_post_meta( $post->ID, 'section', true );
    $section_number = get_post_meta( $post->ID, 'section_number', true ) ;          

    ?>
        <style>.cell{display: table-cell; vertical-align: middle;}
    .row{width: 100%;display: table;border-bottom: 1px solid #DFDFDF;padding: 2px;}
    </style>



        <div class="row">
                                    <div class="cell" style="width: 15%"><b>Number of sections</b></div>
                                    <div class="cell" style="width: 10%"><input type="number" name="post_section_number"  value="<?php echo $section_number; ?>" /></input></div>
                                    <div class="cell" style="width: 5%">        <script>
        jQuery('.metabox_submit').click(function(e) {
            e.preventDefault();
            jQuery('#publish').click();
        });
        </script>
        <input type="submit" class="metabox_submit button button-primary" value="Submit" /></div>
                                    <div class="cell" style="width: 70  %"> &nbsp;</div>
                                  </div>


    <?php 
                $i = 1;
                while ($i <= $section_number) {?>
                        <div class="row">
                                    <div class="cell" style="width: 30%"><b>Section <?php echo '#'.$i;?> </b></div>
                                    <div class="cell" style="width: 50%"><?php  wp_editor( $section[$i], 'sectionid'.$i, $section_editor_settings[$i]  ); ?> </div>
                                    <div class="cell" style="width: 5%"></div>
                                    <div class="cell" style="width: 15%"><p class="howto">Enter body for this section here, and apply neccessary formatting</p></div>
                                  </div>
    <?php $i++; }

}

/Saves Post/

  add_action( 'save_post', 'add_post_fields', 10, 2 );  

function add_post_fields( $post_id, $post ) {
    // Check post type for movie reviews
    $section_values[] = array();

    if ( $post->post_type == 'post' ) {
        $i = 1;
                while ($i <= 4) {

                    $section_values[$i] = $_POST['post_section'.$i];

                    $i++; }
        // Store data in post meta table if present in post data
        if ( isset( $section_values ) && $section_values != '' ) {
            update_post_meta( $post_id, 'section', $section_values );
        }

            if ( isset( $_POST['post_section_number'] ) && $_POST['post_section_number'] != '' ) {
            update_post_meta( $post_id, 'section_number', $_POST['post_section_number'] );
        }

    }
}