重新加载页面包括每30秒或用户提交表单时

I have a PHP page with a lot of includes which make up various parts of the page for a video website.

I have a comments section which submits information into a database (Which works fine). But I need to make it so when this is done only the included page/div refreshes.

This is the PHP:

<form id="song-comment-form">
    <input type="hidden" value="<?=$rSong->id?>" class="song-id">
    <textarea class="editor" id="song-comment-textarea"></textarea><br>
    <input type="submit" value="Submit"><input type="button" value="Cancel" id="hide-song-comment-form">
    <hr>
</form>
<div id="player-song-comments">
    <?php $showComments?>
</div>

Here is my attempt at doing it with Javascript:

<script>

var $comments = $("#player-song-comments");
setInterval(function () {
    $comments.load("/template/sections/player_comments.php #player-song-comments");
}, 30000);

</script>

This should reload just the comments section but instead, everything from this point onwards goes blank.

How it looks now when I press submit:

When I reload that page manually:

I don't want the whole page to refresh because it contains a video.

How can I make just that Refresh after submit is pressed OR every 30 seconds?

UPDATE: I have tried using JQuery to execute this. I'm getting an error:

Fatal error: Call to a member function query() on a non-object in /home/content/58/12052758/html/template/sections/header.php on line 42

    <script> 
        /*wait for the DOM to be loaded 
        $(document).ready(function() { 
            // bind 'myForm' and provide a simple callback function 
            $('#song-comment-form').ajaxForm(function() { 
                alert("Thank you for your comment!"); 
            }); 
        }); */   //THIS IS LINE 42
        $(document).ready(function() { 
        var options = {
            url: 'template/sections/player_comments',
            target: '#player-song-comments', // target element(s) to be updated with server response
            type: 'post' // 'get' or 'post', override for form's 'method' attribute
        }; 

    // bind form using 'ajaxForm' 
    $('#song-comment-form').ajaxForm(options); 
            $(document).ready(function() { 
            // bind 'myForm' and provide a simple callback function 
            $('#song-comment-form').ajaxForm(function() { 
                $("#player-song-comments").load('template/sections/player_comments.php');
                alert("Thank you for your comment! The site is currently in maintenance and the comment won't show until you revisit this video"); 
            }); 
        }); 
}); 
    </script> 

For those interested. Here is the whole page: http://pastebin.com/c0kQ3tGp

You seems to load comments in PHP and as far as I know, PHP is only parsed once.

The simplest workaround I know is to use an iframe that you would refresh, but I'm not sure this is a good practice tho.

So there are two parts to your question:

How can I make just that Refresh after submit is pressed

You can use jquery-form for that. In your case, you can initialize your form to something like this:

$(document).ready(function() { 
    var options = {
        url: 'your_form_action',
        target: '#player-song-comments', // target element(s) to be updated with server response
        type: 'post' // 'get' or 'post', override for form's 'method' attribute
    }; 

    // bind form using 'ajaxForm' 
    $('#song-comment-form').ajaxForm(options); 
}); 

There are many other options you can play with.

OR every 30 seconds?

Try change your

$comments.load("/template/sections/player_comments.php #player-song-comments");

to

$comments.load("/template/sections/player_comments.php"); // remove the selector

According to the docs, the selector is used to insert fragments of the remote document. In other words, when load was executed, jQuery parses the returned document to find the element #player-song-comments. This element, along with its contents, is inserted into the element with an ID of result, and the rest of the retrieved document is discarded.... I assume #player-song-comments is not part of your response?