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// Math

<!doctype html>
<html lang="en">

  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>CKEditor 5 classic example with math plugin</title>
  </head>

  <body>
    <h1>CKEditor 5 – classic editor build</h1>
    <h2>Math plugin – MathJax demo</h2>

    <h2>Example TeX equations</h2>
    <b>Math</b>
    <pre>x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}</pre>
    <b>Chem</b>
    <pre>\ce{CH4 + 2 O2 -> CO2 + 2 H2O}</pre>

    <h2>Paste from text</h2>
    <b>Display</b>
    <pre>\[ x=\frac{-b\pm\sqrt{b^2-4ac}}{2a} \]</pre>
    <b>Inline</b>
    <pre>\( x+\sqrt{1-x^2} \)</pre>

    <h2>Editor</h2>
    <div id="editor" placeholder="Type the content here!">
      <p>Lorem... <span class="math-tex"> \(x=\frac{-b\pm\sqrt{b^2-4ac}}{2a} \) </span> ...ipsum</p>
      <p>Lorem... <span class="math-tex"> \[ x=\frac{-b\pm\sqrt{b^2-4ac}}{2a} \] </span> ...ipsum</p>
      <p>Lorem... <script type="math/tex">x+\sqrt{1-x^2}</script> ...ipsum</p>
      <p>Lorem... <script type="math/tex; mode=display">x+\sqrt{1-x^2}</script> ...ipsum</p>
    </div>

    <h2>Preview</h2>
    <div id="editor-preview"></div>

    <h2>Data</h2>
    <pre id="editor-preview-html" style="word-wrap: break-word; white-space: pre-wrap;"></pre>

    <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.6/MathJax.js?config=TeX-MML-AM_CHTML"></script>
    <script>
      MathJax.Ajax.config.path["mhchem"] = "https://cdnjs.cloudflare.com/ajax/libs/mathjax-mhchem/3.3.2";
      MathJax.Hub.Config({
        showMathMenu: false,
        TeX: {
          extensions: [ "[mhchem]/mhchem.js" ]
        },
        messageStyle: "none",
          tex2jax: {
          preview: "none"
        }
      });
    </script>
    <script src="https://cdn.jsdelivr.net/gh/isaul32/ckeditor5@c3463fe834049bf5d805d1d22402108a9c0576bd/packages/ckeditor5-build-classic/build/ckeditor.js"></script>
    <script>
      function getEditorData() {
        const data = window.ckeditor.getData();

        // HTML
        const preview = document.getElementById('editor-preview');
        preview.innerHTML = data;
        MathJax.Hub.Queue(["Typeset", MathJax.Hub, preview]); // MathJax 2

        // Text
        document.getElementById('editor-preview-html').innerText = data;
      }
      
      ClassicEditor.create(document.querySelector('#editor'), {
          math: {
            engine: 'mathjax',
            outputType: 'script',
            forceOutputType: false,
            enablePreview: true
          }
        })
        .then(editor => {
          window.ckeditor = editor;
          getEditorData();
          editor.model.document.on('change:data', () => {
            getEditorData();
          });
        })
        .catch(err => {
          console.error(err);
        });
    </script>
  </body>

</html>