Wordpress - How refresh page after updating a DB

Question

I’m trying to make a plugin to a slider I already made an admin panel, and I can update the db, but I've a problem after I put the new data and press update - its updates the db, but it is not shown on the page. I need to refresh the admin page, and only after that, I can see the changes.

How can I automatically refresh the page?

• I try to call js func etc.:window.location.reload()
• I tried a lot but nothing seemed work
• I have a little understanding of JavaScript and I don't know what the problem is and how to fix it

Code:

<form  action="" method="post">
<?php
for($i=1; $i<=5; $i++)
{
    $sliderows=getSliderData($i);
    echo '<div id="single-slide-wrap">
            <div id="slide-num">
                <p id="stitle"><strong>#'.$i.'</strong></p>
                <input name="slideradio" type="radio" value="'.$i.'" />
            </div><!--slide-num-->
            <div id="slide-pic">
                <img alt="" src="'.$sliderows['img'].'" style="width: 120px; height: 80px;" />
            </div><!--slide-pic-->
            <div id="slide-text">
                <strong>Img Url: </strong>'.$sliderows['img'].'<br />
                <strong>Title: </strong>'.$sliderows['title'].'<br />
                <strong>Url: </strong>'.$sliderows['url'].'<br />
            </div><!--slide-text-->
                
            </div><!--single-slide-wrap-->';
}
    ?>
    
<h3>update Slider</h3>

IMAGE URL: <input type="text" name="img" />
TEXT: <input type="text" name="text" />
URL: <input type="text" name="url" />
<input type='submit' name="submit" value='update'  /> 
</form>

<?php       

  if (isset($_POST['submit'])) {
    if (isset($_POST['slideradio'])) {

      switch ($_POST['slideradio']) {
        case '1':
          update_slider_db(1);
          break;
        case '2':
          update_slider_db(2);
          break;
        case '3':
          update_slider_db(3);
          break;
        case '4':
          update_slider_db(4);
          break;
        case '5':
          update_slider_db(5);
          break;
      }
    }
  }

  echo '</div>';
}

Answer 1

i just found the answer - after a lot of digging:

i insert the code:
header("location: " . $_SERVER['REQUEST_URI']);
into update_slider_db function - after updating the db.
and then add:

//allow redirection, even if my theme starts to send output to the browser
add_action('init', 'do_output_buffer');
function do_output_buffer() {
    ob_start();

}

into function.php