ui-experiments/index.html at master · robValtech/ui-experiments · GitHub

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<html>
  <head>
    <title>Print via iframe</title>

    <style type="text/css">
      /*iframe {
        width: 100%;
        height: 80vh;
        border: 2px solid grey;
      }*/

      .visually-hidden {
        position: absolute !important;
        width: 1px !important;
        height: 1px !important;
        margin: 0 !important;
        padding: 0 !important;
        overflow: hidden !important;
        clip: rect(0 0 0 0) !important;
        -webkit-clip-path: inset(50%) !important;
        clip-path: inset(50%) !important;
        border: 0 !important;
        white-space: nowrap !important;
      }

      button {
        padding: 0.6rem 1rem;
        border-radius: 6px;
        text-transform: uppercase;
        font-weight: bold;
        outline: none;
        border: 3px solid #999999;
        cursor: pointer;
        margin-bottom: 1rem;
        background: #000000;
        color: #ffffff;
      }

      .centred-container {
        left: 50%;
        top: 50%;
        position: absolute;
        transform: translate(-50%, -50%);
      }
    </style>
  </head>
  <body>
    <main>
      <div class="centred-container">
        <button type="button" id="print-button">🐈 PRINT DOCUMENT 🐈</button>
      </div>
    </main>

    <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.slim.min.js"></script>
    <script type="text/javascript" src="scripts/image-loader.js"></script>
    <script type="text/javascript">
      (function() {
        var pdfPrinter = {};
        var _this = pdfPrinter;

        // MOCK image sources
        _this.imageSources = [
          'http://placekitten.com/g/2000/3000',
          'http://placekitten.com/g/4000/500',
          'http://placekitten.com/g/3000/800',
          'http://placekitten.com/g/600/200',
          'http://placekitten.com/g/2000/2000'
        ];

        // Self invoking kick off method
        (function init() {
          // Create iframe
          _this.iframe = document.createElement('iframe');
          _this.iframe.setAttribute('src', 'about:blank');
          _this.iframe.setAttribute('id', 'print-iframe');
          _this.iframe.setAttribute('class', 'visually-hidden');
          document.body.appendChild(_this.iframe);

          // Initialise the button
          _this.button = document.querySelector('#print-button');
          _this.button.addEventListener('click', (e) => {
            populateDocument();
          });

          // Prepare the image preloader
          prepareImagePreloading();
        })();

        // Build the MOCK contents from various documents
        // Make sure that the images from the contents are listed for preloading
        function populateDocument() {
          var htmlContent = `<button class="button-warning pure-button">Warning Button</button>`;
          htmlContent += `<article>`;
            htmlContent += `<h1>Document with kittens 🐈 🐈 🐈</h1>`;
            htmlContent += `<p>This document was generated at ${generateDate()}</p>`;
          htmlContent += `</article>`;
          htmlContent += `<article>`;
            htmlContent += `<h1>Kitten #1</h1>`;
            htmlContent += `<img src="${_this.imageSources[0]}" alt="kitten" />`;
          htmlContent += `</article>`;
          htmlContent += `<article>`;
            htmlContent += `<h1>Kitten #2</h1>`;
            htmlContent += `<img src="${_this.imageSources[1]}" alt="kitten" />`;
          htmlContent += `</article>`;
          htmlContent += `<article>`;
            htmlContent += `<h1>Kitten #3</h1>`;
            htmlContent += `<img src="${_this.imageSources[2]}" alt="kitten" />`;
          htmlContent += `</article>`;
          htmlContent += `<article>`;
            htmlContent += `<h1>Kitten #4</h1>`;
            htmlContent += `<img src="${_this.imageSources[3]}" alt="kitten" />`;
          htmlContent += `</article>`;
          htmlContent += `<article>`;
            htmlContent += `<h1>Kitten #5</h1>`;
            htmlContent += `<img src="${_this.imageSources[4]}" alt="kitten" />`;
          htmlContent += `</article>`;

          _this.imageLoader.reset(); // Manually reset the image loader
          _this.imageLoader.addToQueue(_this.imageSources);

          renderContent(htmlContent);
        }

        // Render the html content into the iframe using print styling
        function renderContent(htmlContent) {
          // Prepare the HTML document
          var documentSource =  '<html><head>';
          documentSource += '<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/pure/1.0.1/pure-min.css" media="screen" />';
          documentSource += '<link rel="stylesheet" href="styles/print.css" />';
          documentSource += '<body></body></html>';

          // Write the HTML document into the iframe
          var iframeDoc = _this.iframe.contentWindow.document;
          iframeDoc.open('text/html', 'replace');
          iframeDoc.write(documentSource);
          iframeDoc.close();

          // Use the MOCK content
          iframeDoc.body.innerHTML += htmlContent;

          // Preload the images to make sure everything prints fine
          _this.imageLoader.loadQueue();
        }

        function prepareImagePreloading() {
          if (!_this.imageLoader) {
            _this.imageLoader = new ImageLoader();

            $(_this.imageLoader).on('progress', (e, progress) => {
              console.log('load progress: ', `${progress*100}%`);
            });
            $(_this.imageLoader).on('completed', () => {
              setTimeout(() => {
                _this.iframe.contentWindow.print();
              }, 1000);
            });
          }
        }

        function generateDate() {
          return Date.now();
        }
      })();
    </script>
  </body>
</html>