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I want to add upload image button for the images and retrieve url. Can someone pls help me, i have been trying this for quite a few days. I'm using code from this thread Create more Meta Boxes as needed.

add_action( 'add_meta_boxes', 'dynamic_add_custom_box' );

/* Do something with the data entered */
add_action( 'save_post', 'dynamic_save_postdata' );

/* Adds a box to the main column on the Post and Page edit screens */
function dynamic_add_custom_box() {
    add_meta_box(
        'dynamic_sectionid',
        __( 'Client Information', 'myplugin_textdomain' ),
        'dynamic_inner_custom_box',
        'page');
}

/* Prints the box content */
function dynamic_inner_custom_box() {
    global $post;
    // Use nonce for verification
    wp_nonce_field( plugin_basename( __FILE__ ), 'dynamicMeta_noncename' );
    ?>
    <div id="meta_inner">
    <?php

    //get the saved meta as an arry
    $ourwork = get_post_meta($post->ID,'ourwork',true);

    $c = 0;
    if ( is_array( $ourwork ) ) {
        foreach( $ourwork as  $track ) {
            if ( isset( $track['thumb'] ) || isset( $track['client-img1'] ) || isset( $track['client-img2'] ) || isset( $track['client-img3'] ) || isset( $track['client-img4'] ) || isset( $track['client-desc'] ) ) {
                printf( '<p><strong>Thumb Image</strong> &nbsp;:&nbsp;<input type="button" name="ourwork[%1$s][thumb]" value="%2$s" size="50" /><br/><br/><strong>Client Image 1</strong> : <input type="button" name="ourwork[%1$s][client-img1]" value="%3$s" size="50" /><br/><br/>
                <strong>Client Image 2</strong> : <input type="button" name="ourwork[%1$s][client-img2]" value="%4$s" size="50"/><br/><br/>
                <strong>Client Image 3</strong> : <input type="button" name="ourwork[%1$s][client-img3]" value="%5$s" size="50" /><br/><br/>
                <strong>Client Image 4</strong> : <input type="button" name="ourwork[%1$s][client-img4]" value="%6$s" size="50" />
                <br/><br/>
                <strong>Client Link &nbsp;&nbsp;&nbsp;&nbsp;1</strong> : <input type="text" name="ourwork[%1$s][client-link1]" value="%7$s" size="50" />
                <br/><br/>
                <strong>client Description</strong> :<br/><textarea id="elm1" class="tinymce_data" name="ourwork[%1$s][client-desc]" cols="75" rows="6" >%8$s</textarea><br/>
                <span class="remove">%9$s</span></p>', $c, $track['thumb'], $track['client-img1'], $track['client-img2'] , $track['client-img3'], $track['client-img4'], $track['client-link1'], $track['client-desc'],  __( '<span class="button">Remove Section</span>' ) );
                $c = $c +1;
            }
        }
    }
    ?>
<span id="here"></span>
<span class="add"><?php _e('<span class="button">Add Section</span>'); ?></span>
<script>
    var $ =jQuery.noConflict();
    $(document).ready(function() {
        var count = <?php echo $c; ?>;
        $(".add").click(function() {
            count = count + 1;

            $('#here').append('<p><strong>Thumb Image</strong> &nbsp;:&nbsp;<input type="button" name="ourwork['+count+'][thumb]" value="" size="50"/><br/><br/><strong>Client Image 1</strong> : <input type="type="button"" name="ourwork['+count+'][client-img1]" value="" size="50"/><br/><br/><strong>Client Image 2</strong> : <input type="button" name="ourwork['+count+'][client-img2]" value="" size="50"/><br/><br/><strong>Client Image 3</strong> : <input type="type="button"" name="ourwork['+count+'][client-img3]" value="" size="50"/><br/><br/><strong>Client Image 4</strong> : <input type="type="button"" name="ourwork['+count+'][client-img4]" value="" size="50"/><br/><br/><strong>Client Link &nbsp;&nbsp;&nbsp;&nbsp;1</strong> : <input type="text" name="ourwork['+count+'][client-link1]" value="" size="50"/><br/><br/><strong>Client Description</strong> :<br/><textarea id="elm1" name="ourwork['+count+'][client-desc]" cols="75" rows="6"></textarea><br/><span class="remove"><span class="button">Remove Section</span></span></p>' );
            return false;       
        });
        $(".remove").live('click', function() {
            $(this).parent().remove();
        });
    });
    </script>
</div><?php

}

/* When the post is saved, saves our custom data */
function dynamic_save_postdata( $post_id ) {
    // verify if this is an auto save routine. 
    // If it is our form has not been submitted, so we dont want to do anything
    if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) 
        return $post_id;

    // verify this came from the our screen and with proper authorization,
    // because save_post can be triggered at other times
    if ( !isset( $_POST['dynamicMeta_noncename'] ) )
        return;

    if ( !wp_verify_nonce( $_POST['dynamicMeta_noncename'], plugin_basename( __FILE__ ) ) )
        return;

    // OK, we're authenticated: we need to find and save the data

    $ourwork = $_POST['ourwork'];

    update_post_meta($post_id,'ourwork',$ourwork);
}
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I did a blog post about this, please check: http://www.derby-web-design-agency.co.uk/blog-post/how-to-create-multiple-wordp‌​ress-3-5-media-uploaders-in-theme-options/27/ I think this is what you mean :) –  Robert Aug 7 '13 at 18:46
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2 Answers 2

There's an excellent framework for interacting with Metaboxes that's reasonably easy to use (well documented) and includes support for multiple metaboxes options including image/file uploads. It's on Github: Custom Metaboxes and Fields (CMB). If you were to use CMB, this would be one approach for implementing an upload field.

You would need to register the file upload metabox and add a call to the CMB init.php using the following code in your functions.php file:

function be_sample_metaboxes( $meta_boxes ) {
    $prefix = '_cmb_'; // Prefix for all fields
    $meta_boxes['test_metabox'] = array(
        'id' => 'test_metabox',
        'title' => 'Test Metabox',
        'pages' => array('post'), // post type (e.g post, post etc.)
        'context' => 'normal',
        'priority' => 'high',
        'show_names' => true, // Show field names on the left
        'fields' => array(
            array(
                'name' => __( 'Test Image', 'cmb' ),
                'desc' => __( 'Upload an image or enter a URL.', 'cmb' ),
                'id'   => $prefix . 'test_image',
                'type' => 'file',
            ),
        ),
    );

    return $meta_boxes;
}
add_filter( 'cmb_meta_boxes', 'be_sample_metaboxes' );

// Initialize the metabox class
add_action( 'init', 'be_initialize_cmb_meta_boxes', 9999 );
function be_initialize_cmb_meta_boxes() {
    if ( !class_exists( 'cmb_Meta_Box' ) ) {
        require_once( './metabox/init.php' );
    }
}

The line require_once( './metabox/init.php' ); in the second function assumes you've placed the files from the CMB Metabox in a folder within your theme directory called metabox. Then to call this option in your template (e.g. single.php) you could use the following function

$file = get_post_meta( $post->ID, '_cmb_test_image', true );
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this is how I do to create upload button in metabox:

FILE: template_dir/functions.php

add this lines:

wp_enqueue_script('custom-js', get_template_directory_uri().'/js/custom-js.js');

// Add the Meta Box  
function add_custom_meta_box() {  
    add_meta_box(  
        'custom_meta_box', // $id  
        'Custom Meta Box', // $title   
        'show_custom_meta_box', // $callback  
        'post', // $page  
        'normal', // $context  
        'high'); // $priority  
}  
add_action('add_meta_boxes', 'add_custom_meta_box');  

// Field Array  
$prefix = 'custom_';  
$custom_meta_fields = array(
    array(  
        'name'  => 'Image',  
        'desc'  => 'A description for the field.',  
        'id'    => $prefix.'image',  
        'type'  => 'image'  
    )  
);


// The Callback  
function show_custom_meta_box() {  
global $custom_meta_fields, $post;  
// Use nonce for verification  
echo '';  

    // Begin the field table and loop  
    echo '';  
    foreach ($custom_meta_fields as $field) {  
        // get value of this field if it exists for this post  
        $meta = get_post_meta($post->ID, $field['id'], true);  
        // begin a table row with  
        echo ' 
                '.$field['label'].' 
                ';  
                switch($field['type']) {  
                    // case items will go here 
                        // image  
                        case 'image':  
                            $image = get_template_directory_uri().'/images/image.png';    
                            echo ''.$image.'';  
                            if ($meta) { $image = wp_get_attachment_image_src($meta, 'medium'); $image = $image[0]; }                 
                            echo    ' 
                                        
Remove Image '.$field['desc'].''; break; } //end switch echo ''; } // end foreach echo ''; // end table } // Save the Data function save_custom_meta($post_id) { global $custom_meta_fields; // verify nonce if (!wp_verify_nonce($_POST['custom_meta_box_nonce'], basename(__FILE__))) return $post_id; // check autosave if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) return $post_id; // check permissions if ('page' == $_POST['post_type']) { if (!current_user_can('edit_page', $post_id)) return $post_id; } elseif (!current_user_can('edit_post', $post_id)) { return $post_id; } // loop through fields and save the data foreach ($custom_meta_fields as $field) { $old = get_post_meta($post_id, $field['id'], true); $new = $_POST[$field['id']]; if ($new && $new != $old) { update_post_meta($post_id, $field['id'], $new); } elseif ('' == $new && $old) { delete_post_meta($post_id, $field['id'], $old); } } // end foreach } add_action('save_post', 'save_custom_meta');

FILE: template_dir/js/custom-js.js

    jQuery(function(jQuery) {  

        jQuery('.custom_upload_image_button').click(function() {  
            formfield = jQuery(this).siblings('.custom_upload_image');  
            preview = jQuery(this).siblings('.custom_preview_image');  
            tb_show('', 'media-upload.php?type=image&TB_iframe=true');  
            window.send_to_editor = function(html) {  
                imgurl = jQuery('img',html).attr('src');  
                classes = jQuery('img', html).attr('class');  
                id = classes.replace(/(.*?)wp-image-/, '');  
                formfield.val(imgurl);  //get image url and copy to field
                preview.attr('src', imgurl);  
                tb_remove();  
            }  
            return false;  
        });  

        jQuery('.custom_clear_image_button').click(function() {  
            var defaultImage = jQuery(this).parent().siblings('.custom_default_image').text();  
            jQuery(this).parent().siblings('.custom_upload_image').val('');  
            jQuery(this).parent().siblings('.custom_preview_image').attr('src', defaultImage);  
            return false;  
        });  

    });  



If you want to add more types of fields you can learn more at: Reusable Custom Meta Boxes Part 1: Intro and Basic Fields

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