php - Unable to auto-refresh page element using AJAX -

i playing around trying make chatbox, find myself unable make auto-reload messages. using database messages there insufficient permission php write files on server. here code chatbox:

<input name="usermsg" id="usermsg" type="text"/>     <button id="submitmsg" type="button" onclick="onsubmit()">send</button>  </div>   <script type="text/javascript" src="src/assets/js/jquery.js"></script>  <script>     function onsubmit(){         //console.log('ghffgj');         if($("#usermsg").val()) {             //alert($("#usermsg").val());             var clientmsg = $("#usermsg").val();             $.ajax({                 type: "post",                 url: "src/add_reply.php",                  data: {text: clientmsg},             });              $("#usermsg").attr("value", "");             return false;         }     }      setinterval (loadlog, 3000);      function loadlog(){              $.ajax({             url: "src/chatlog.php",             cache: false,             success: function(data){                         $("#chatbox").html(data);                   },         });     } </script> 

and code chatlog.php:

<?php include('src/database_connect.php');   $select_query = "select author, send_date, message chatbox";   $chat_obj = $conn->query($select_query);   while($row = $chat_obj->fetch_assoc()){      echo "<div><span style='font-size: 10px'>(".$row['send_date'].")</span><b>".$row['author']."</b>: ".$row['message'];  }   $conn->close();   ?> 

adding new messages in database works, can't seem able return text display on chatlog.php chatbox page

edit: forgot mention, browser console displays this: http://domain/chatbox/src/chatlog.php?_=1467644248226 500 internal server error 29ms

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found solution, displayed below: index.php (only chatbox code):

        <input name="usermsg" id="usermsg" type="text"/>     <button id="submitmsg" type="button" onclick="onsubmit()">send</button>  </div>   <script type="text/javascript" src="src/assets/js/jquery.js"></script>  <script>      function onsubmit(){         console.log($("#usermsg").val());         if($("#usermsg").val()) {             //alert($("#usermsg").val());             var clientmsg = $("#usermsg").val();             $.ajax({                 type: "post",                 url: "src/add_reply.php",                  data: {text: clientmsg},             });              $("#usermsg").val("");             return false;         }     }        function loadlog(){              $.ajax({             url: "src/chatlog.php",             cache: false,             success: function(data){                         $("#chatbox").html(data);              },         })/*.done(function(msg) {           alert(msg);         })*/;     }      $( document ).ready(function() {         loadlog();         setinterval (loadlog, 2000);     }); </script> 

chatbox.php :

<?php   include('database_connect.php');   $select_query = "select author, send_date, message chatbox";   $chat_obj = $conn->query($select_query);   //$chat_list = array();  $content = "";  while($row = $chat_obj->fetch_assoc()){      //$chat_list[] = $row;       $content .= "<div><span style='font-size: 10px'>(" .           $row['send_date'].")</span><b>".          $row['author']."</b>: ".$row['message']."</div>";  }   $conn->close();  die($content);  ?>