Submit button to affect multiple files - php

Question

Current Situation:
So, for an article page (article.php), I have 2 different sections (title, content), which are hooked to the article page from their own php files (Title is pulled from title.php while content is pulled from content.php).
Now, I added an ability for the author to edit the title and content on the article which they need to press submit button in order save the change.
Problem
After editing, the author needs to press "Submit" button in order to update the data.
However, when I put the "submit" button in either title.php or content.php, only the corresponding section is updated while the other is unchanged (for example, if I have this submit button in the title.php then only title is edited).
If I put the button in the article.php then of course neither the title nor content gets updated.
Here is the mark up:
Article.php:
<div class="article">
<?php do_action ('article_summary'); ?>
</div>
Title.php (with the submit button, which only updates the title)
<form role="form" method="post">
<div class="edit_title">
<input type="hidden" value="<?php echo $post_id; ?>">
<?php post_input_box( $post_id, 'post_title', array( 'placeholder' => 'Article title..', 'value' => $post->post_title ) ); ?>
<div class="update-button-wrap">
<input type="submit" name="update_product" value="<?php esc_attr_e( 'Update', 'site' ); ?>"/>
</div>
</div>
</form>
Content.php
<form role="form" method="post">
<div class="edit_content">
<?php post_input_box( $post_id, 'post_content', array( 'placeholder' => 'Short description..', 'value' => $post->post_content ), 'textarea' ); ?>
</div>
</form>
Does anyone know how the submit button can save both title and content that are in two different files?
Thanks bunch!

Answer 1

Try using a super-button (pattent pending) that presses all them other buttons for ye...
<button type='button' onclick="$('[type="submit"]').click()">Submit</button>
Since its type button, it won't submit itself. Replace each submit button with this. I mean, leave the original buttons there, but style them with
button[type="submit"] { display:none }