plugins – add_meta_box (Will display only in specific page admin WordPress)

Question

I am wondering how to add meta box in WordPress specific page admin, I mean when I create meta_box with code snippet below provided from source tutorial is really perfect and effective but one thing that I need to control is display that meta_box only in specific page for instance: pretend I have two page in my WordPress project named Home and About.

When I create meta_box by default the meta_box that I add will display on the same page admin back end, imagined when I clicked edit button to Home and About page my meta box will appear in both page. What I want is make a meta_box only show in “Home” admin backend page when I click the edit page.

My goal is set different meta_box in every different page, meaning the users specially the blog editor expect different meta_box_field in different page when they click edit button in each page, That is the thing I can’t figure out can you help me to solve that problem

/*
Plugin Name: Meta Box Example
Description: Example demonstrating how to add Meta Boxes.
Plugin URI:  https://plugin-planet.com/
Author:      Jeff Starr
Version:     1.0
*/

// register meta box
function myplugin_add_meta_box() {

    $post_types = array( 'post', 'page' );

    foreach ( $post_types as $post_type ) {

        add_meta_box(
            'myplugin_meta_box',         // Unique ID of meta box
            'MyPlugin Meta Box',         // Title of meta box
            'myplugin_display_meta_box', // Callback function
            $post_type                   // Post type
        );

    }

}
add_action( 'add_meta_boxes', 'myplugin_add_meta_box' );

// display meta box
function myplugin_display_meta_box( $post ) {

    $value = get_post_meta( $post->ID, '_myplugin_meta_key', true );

    wp_nonce_field( basename( __FILE__ ), 'myplugin_meta_box_nonce' );

    ?>

    <label for="myplugin-meta-box">Field Description</label>
    <select id="myplugin-meta-box" name="myplugin-meta-box">
        <option value="">Select option...</option>
        <option value="option-1" <?php selected( $value, 'option-1' ); ?>>Option 1</option>
        <option value="option-2" <?php selected( $value, 'option-2' ); ?>>Option 2</option>
        <option value="option-3" <?php selected( $value, 'option-3' ); ?>>Option 3</option>
    </select>

<?php

}

// save meta box
function myplugin_save_meta_box( $post_id ) {

    $is_autosave = wp_is_post_autosave( $post_id );
    $is_revision = wp_is_post_revision( $post_id );

    $is_valid_nonce = false;

    if ( isset( $_POST[ 'myplugin_meta_box_nonce' ] ) ) {

        if ( wp_verify_nonce( $_POST[ 'myplugin_meta_box_nonce' ], basename( __FILE__ ) ) ) {

            $is_valid_nonce = true;

        }

    }

    if ( $is_autosave || $is_revision || !$is_valid_nonce ) return;

    if ( array_key_exists( 'myplugin-meta-box', $_POST ) ) {

        update_post_meta(
            $post_id,                                            // Post ID
            '_myplugin_meta_key',                                // Meta key
            sanitize_text_field( $_POST[ 'myplugin-meta-box' ] ) // Meta value
        );

    }

}
add_action( 'save_post', 'myplugin_save_meta_box' );

Is there any condition or function to do that you will recommend?

0
Niel Fernandez 1 month 2021-03-31T20:12:21-05:00 0 Answers 0 views 0

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