I have a simple form, where user can set some numeric value and add a comment. Then it is being send to database via AJAX call.

So I have two inputs: a numeric slider (text field) and a textarea for comment (and of course submit button).

My JavaScript that calls Ajax after clicking the button looks like that:


    var dok = jQuery(this).parent().find("input#dok").val(); //  this is always integer
    var comment = jQuery(this).parent().find("#komentarz").val(); // this is string

    var data = {
            action: 'ocen',
            dok: dok,
            comment: comment
     var jqxhr = jQuery.post("http://mydomain/wp-admin/admin-ajax.php", data, function(response){
            setTimeout(function(){location.reload();}, 1500);

I used this method succesfully for about 7 months. But lately after one of the wordpress' actualizations it stopped to work correctly: If I set only the numeric value, it is being saved to database correctly, but if I add a comment, the page is being reloaded but nothing is being saved to DB.

What can be wrong with it?

EDIT: the php code:

function ajax_ocen()
global $wpdb;
        $comment = "";

    $q = "INSERT INTO my_table(date, dok, comment) VALUES(NOW(), $dok, '$comment')";

    $res = $wpdb->query($q);
        echo "<div class='success'>Added</div>";




OK, I found out that comment is not being saved if it contains special language-specific characters. How can I escape/convert those charracters to be properly saved to DB?

  • Can you post the PHP code? – cybmeta May 13 '15 at 21:06
  • Yes - see my edit – Gacek May 13 '15 at 22:08
  • You use extract($_POST); and then $comment and $dot; that expect that the name attribute of the textarea is comment ($comment extracted from $_POST['comment']) and the name attribute of the input is dok ($dok extracted from $_POST['dok']), are those values correctly set in the name attributes? Can you post the HTML also? Aside note: extract() was abandoned by WordPress core and, in general, it is not recommended because it makes debugging more difficult, as you can see in this situation. – cybmeta May 14 '15 at 5:32
  • Yes, they are correctly set. – Gacek May 17 '15 at 11:23
  • Try to echo the resulting query $q. (Also, please use $wpdb->escape() to avoid possible SQL injections.) – giraff May 17 '15 at 12:37

OK, I found out that my DB encoding was LATIN2 and wordpress forced UTF-8 in all calls after the update.

When I changed my database's encoding to UTF-8 it all started to work. I also used:

$comment = mb_convert_encoding($comment, "UTF-8");

just to be shure.

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