tools/format/format.html

<!DOCTYPE html>
<html>
  <head>
    <title>Cataclysm web linting tool</title>
    <style>
      * { font-family: 'monospace'; }
      input { display: block; }
    </style>
    <script>
      function lint(form) {
          var txt = form.getElementsByTagName('textarea')[0];
          var cmd = form.getElementsByTagName('input')[0];

          if (txt.value.length == 0) {
              return false;
          }
          try {
              JSON.parse(txt.value);
          } catch (e) {
              alert('Syntax error');
              return false;
          }

          var xhr = new XMLHttpRequest();
          xhr.open('POST', '/format/json_formatter.cgi');
          xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
          xhr.timeout = 10000; // 10 seconds

          xhr.onload = function() {
              if (xhr.status == 200) {
                  txt.value = xhr.responseText;
              } else if (xhr.status == 304) {
                  // no-op
              } else if (xhr.status == 400) {
                  alert(xhr.responseText);
              } else {
                  alert('Linter currently unavailable');
              }
              txt.disabled = false;
              cmd.disabled = false;
              window.document.body.style.cursor = "default";
          };

          xhr.ontimeout = function() {
              alert('Request timed out');
              txt.disabled = false;
              cmd.disabled = false;
              window.document.body.style.cursor = "default";
          }

          xhr.send('data=' + encodeURIComponent(txt.value));

          txt.disabled = true;
          cmd.disabled = true;
          window.document.body.style.cursor = "wait";
          return false; // suppress default form action
      }
    </script>
  </head>
  <body>
    <h1>Cataclysm web linting tool</h1>
    <form onsubmit="return lint(this);">
      <textarea name="data" cols="120" rows="30"></textarea>
      <input type="submit"/>
    </form>
  </body>
</html>