Count and show Clicks on external links in a single page/post

I have the following scenario I have a post that calls a table by shortcode The table contains links to outside hosts (MediaFire, Dropbox..etc) I want to track how many times all the links from that specific post is clicked and show that count in the post itself.

Is it possible?

Yes, it is possible. You can do this with ajax call that updates post meta field before the link is followed.

In the example, I used admin and non-admin users who click the link and automatic increase link_check_click_counter in the post meta. I used here the example to show the data using wp_footer. You can also use wp_head instead of wp_footer. Copy and paste the code and add it to functions.php. When you clicked on link link_check_click_counter meta will create for that post and you can track how many clicks on the link.

HTML

<div id="link_count">
  <a href="https://www.dropbox.com/">Dropbox</a>
  <a href="https://www.mediafire.com/">Mediafire</a>
  <a href="http://google.com">google.com</a>
  <a href="http://www.linkedin.com/in/turjo">Linkadin</a>
</div>

PHP

<?php
/* functions.php */
add_action( 'wp_ajax_link_check_click_counter', 'link_check_click_counter');
add_action( 'wp_ajax_nopriv_link_check_click_counter', 'link_check_click_counter' );
function link_check_click_counter() {

    if ( isset( $_POST['nonce'] ) &&  isset( $_POST['post_id'] ) && wp_verify_nonce( $_POST['nonce'], 'link_check_click_counter_' . $_POST['post_id'] ) ) {
        $count = get_post_meta( $_POST['post_id'], 'link_check_click_counter', true );
        update_post_meta( $_POST['post_id'], 'link_check_click_counter', ( $count === '' ? 1 : $count + 1 ) );
    }
    exit();
}


add_action( 'wp_footer', 'link_click' );
//add_action( 'wp_head', 'link_click' );
function link_click() {
    global $post;

    if( isset( $post->ID ) ) {
?>
    <script type="text/javascript" >
    jQuery(function ($) {
        var ajax_options = {
            action: 'link_check_click_counter',
            nonce: '<?php echo wp_create_nonce( 'link_check_click_counter_' . $post->ID ); ?>',
            ajaxurl: '<?php echo admin_url( 'admin-ajax.php' ); ?>',
            post_id: '<?php echo $post->ID; ?>'
        };

        $( '#link_count a' ).on( 'click', function() {
            var href = $( this ).attr( "href" );
            var redirectWindow = window.open(href, '_blank');   
            $.post( ajax_options.ajaxurl, ajax_options, function() {
                redirectWindow.location;
            });
            return false;
        });
    });
    </script>
<?php
    }
}
?>

Link Count Of a Post

global $post;
print get_post_meta($post->ID,'link_check_click_counter',true);

Sum all the counts from all the posts

   $all_link_count = link_check_meta_values( 'link_check_click_counter', 'page' );
    $total = array_sum($all_link_count);
    print $total;

//add this in functions.php

function link_check_meta_values( $key = '', $type="post", $status="publish" ) {

    global $wpdb;

    if( empty( $key ) )
        return;

    $r = $wpdb->get_col( $wpdb->prepare( "
        SELECT pm.meta_value FROM {$wpdb->postmeta} pm
        LEFT JOIN {$wpdb->posts} p ON p.ID = pm.post_id
        WHERE pm.meta_key = '%s'
        AND p.post_status="%s"
        AND p.post_type="%s"
    ", $key, $status, $type ) );

    return $r;
}