wordpress .post() 500 server error

I am still learning WordPress and I am using .post() function to get the content of a specific post id. when ever I try to echo the ID I have no problem in the output. but when I try to fetch the content the console always throws a 500 (internal server error).

I don’t know what I’m doing wrong.

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here is my code.

<div class="container inner-container">
  <div class="col-sm-3 col-md-3 sidebar">
    <h4 class="bold"><?php echo $cat_name; ?></h4>
    <hr>
    <nav class="side-nav">
      <ul>
        <?php $posts=q uery_posts( array( 'post_type'=>'post', 'posts_per_page' => 5, 'order' => 'desc', 'orderby' => 'post_date', 'category_name' => $cat_slug) ); ?>

        <?php foreach($posts as $p): ?>
        <li class="view-content" value="<?php echo $p->ID; ?>">
          <?php echo $p->post_title; ?><span class="hover-arrow-right"><i class="fa fa-chevron-right"></i></span>
        </li>
        <?php endforeach; ?>
      </ul>
    </nav>
  </div>
  <div class="col-sm-9 col-md-9">
    <div class="inner-content">


    </div>
  </div>
</div>

this is the jquery.

jQuery('.view-content').click(function(event) {
  var content = jQuery(this).val();
  event.preventDefault();
  jQuery.post('<?php echo get_template_directory_uri(); ?>/content-from-ajax.php', {
    content_id: content,
  }, function(res) {

    jQuery('.inner-content').html(res);

  })

});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>

and here is the file that i assigned in .post() function.

<?php

	$content_id = $_POST['content_id'];

	echo $content_id;

?>

thank you in advance.

sorry for my bad engish grammar.

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1 comment

  1. Use this

    $html = '';
        $posts= new WP_Query(
         array( 'post_type'=>'post',
                'posts_per_page' => 5,
                'order' => 'desc',
                'orderby' => 'post_date',
                'category_name' => $cat_slug )
             ); ?>
        <?php  while ( $posts->have_posts() ) : $posts->the_post();  
        $html .= '<li class="view-content" value="'.get_the_ID().'">'
                  .get_the_title().
               '<span class="hover-arrow-right">
                <i class="fa fa-chevron-right"></i>
              </span>
        </li>';
        endwhile;
      echo $html;
      die();
    

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