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<!DOCTYPE html>
<html>
<head>
  <title></title>
  <style>
    body {
      margin: 1em auto;
      max-width: 40em;
      width: 100%;
    }
    a, label, textarea, button {
      display: block;
    }
  </style>
</head>
<body>
​
  <form method="post" action="https://api.github.com/gists">
    <label for="file-name">File name:</label>
    <input type="text" id="file-name">
    <label for="content">Gist content:</label>
    <textarea id="content"></textarea>
    <button type="submit">Post</button>
  </form>
​
  <div>Gists created so far:</div>
​
  <script>
    (function (win, doc) {
      // Find form elements.
      var forms = doc.querySelectorAll('form[method="post"]');
      // Prevent submit, do an xhr instead.
      forms.forEach(function(form) {
        form.addEventListener('submit', function (e) {
          e.preventDefault();
          // Create the object structure gist.github.com expects:
          // https://developer.github.com/v3/gists/#create-a-gist
          var data = {
            "description": "anonymous gists from a form",
            "public": false,
            "files": {}
          };
          // Specify the file name, default to file.txt.
          var fileName = document.querySelector('#file-name').value || 'file.txt';
          data.files[fileName] = {
            "content": document.querySelector('textarea').value
          }
          var url = form.getAttribute('action');
          var options = {
            headers: {
              'Content-Type': 'application/json;charset=UTF-8'
            },
            method: form.getAttribute('method'),
            body: JSON.stringify(data)
          }
          // https://developer.mozilla.org/en-US/docs/Web/API/GlobalFetch/fetch
          fetch(url, options).then(function(response) {
            response.json().then(function(json) {
              // Show a link to the gist.
              var gistLink = doc.createElement('a');
              gistLink.setAttribute('href', json.html_url);
              gistLink.innerHTML = json.html_url;
              doc.body.appendChild(gistLink);
            });
          }).catch(function(error) {
            console.log('error creating gist', error);
          });
        }, false);
      });
    })(this, this.document);
  </script>
</body>
</html>
​
Output 300px

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