avoid form warning if user clicks refresh (ok)

<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <meta name="language" content="vietnamese">
    <meta property="og:locale" content="vi_VN">
        <meta name="google-site-verification" content="PuA4RXn1IGZbiglCjRvzLUPAKPYw6amIu79SJHmavlQ">
    <meta name="theme-color" content="#13b5ea">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta name="language" content="vn">
    <meta name="keywords" content="học trực tuyến, học online">
    <title>*Client Info*</title>
    <style>table,tr{border:2px solid gold;border-collapse:collapse;}td{padding:5px;}</style>
</head>

<body>
<?php
  $clientProps=array('screen.width','screen.height');
  if(! isset($_POST['screenheight'])){
    echo "<form method='POST' id='data' style='display:none'>";
    foreach($clientProps as $p) {
      echo "<input type='text' id='".str_replace('.','',$p)."' name='".str_replace('.','',$p)."'>";
    }
    echo "<input type='submit'></form>";
    echo "<script>";
        foreach($clientProps as $p) {
          echo "document.getElementById('" . str_replace('.','',$p) . "').value = $p;";
        }
        echo "document.forms.namedItem('data').submit();";
    echo "</script>";

  }else{
    echo "<table>";
    foreach($clientProps as $p) {   //create output table
      echo "<tr><td>".ucwords(str_replace('.',' ',$p)).":</td><td>".$_POST[str_replace('.','',$p)]."</td></tr>";
    }
    echo "</table>";
  }
?>
<script>
    window.history.replaceState(null,null); //avoid form warning if user clicks refresh
</script>
</body>
</html>

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Last updated 5 years ago