pdf-image-gen/index.html at main · wgnhs/pdf-image-gen · GitHub

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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>PDF Image Generator</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@wgnhs/elements@^0/dist/css/variables.css" />
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@wgnhs/elements@^0/dist/css/reset.css" />
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@wgnhs/elements@^0/dist/css/typography.css" />
<style>
    [data-view=app] {
      display: grid;
      grid-template: "left"
                      "right"
                      / 1fr;
    }
    .left-panel {
      grid-area: left;
      display: flex;
      justify-content: space-around;
      flex-direction: column;
      align-items: center;
    }
    .right-panel {
      grid-area: right;
      display: flex;
      justify-content: center;
    }

    [data-view] {
      height: 100%;
      position: fixed;
      top: 0;
      bottom: 0;
      left: 0;
      right: 0;
    }
    .positioned {
      position: absolute;
      top: 0;
      right: 0;
      bottom: 0;
      left: 0;
    }

    a {
      text-decoration: none;
      margin: var(--border-radius) 0;
    }
    .link:hover {
      color: var(--palette-900);
    }
    .link:focus {
      outline: thin dotted;
    }
    .link {
      display: block;

      font-weight: var(--font-weight-bold);
      font-size: var(--font-size-extra-large);
      text-align: center;

      cursor: pointer;
      text-align: center;
      background: var(--palette-light);
      color: var(--palette-accent);
      border-radius: var(--border-radius);
      padding: var(--border-radius);
    }
    .wrap-content {
      display: flex;
      flex-direction: row;
      justify-content: space-between;
      align-items: center;
      padding: 1em;
    }

    [data-closed] {
      display: none;
    }
</style>

<script src="https://cdn.jsdelivr.net/npm/pdfjs-dist@2.2.228/build/pdf.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/@wgnhs/elements@^0/dist/common.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/@wgnhs/elements@^0/dist/layout.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/@wgnhs/elements@^0/dist/pdf.js"></script>
</head>

<body>
<div id="dropbox" data-view="app">
  <div class="left-panel">
    <div>
      <h2>
        Select file:
      </h2>
      <div>
          <input id="uploadInput" type="file" name="myFiles" onchange="handleFiles(this.files);">
      </div>
    </div>
    <h2>
      Or Drag and Drop file...
    </h2>
  </div>
  <div class="right-panel positioned">
    <app-spinner id="spinner" data-closed></app-spinner>
    <div id="output" data-closed>
      ...Success!
      <a
        id="link"
        class="link"
        href="href"
        download="name">
        <div class="wrap-content">
          Download
        </div>
      </a>
    </div>
  </div>
</div>
<script>
  const pdfjsLib = window['pdfjs-dist/build/pdf'];

  function renderPDF(url) {
    if (url) {
      let canvasEl = document.createElement('canvas');
      let loadingTask = pdfjsLib.getDocument(url);
      return loadingTask.promise.then(function(pdf) {
        // console.log('PDF Loaded');
        var pageNumber = 1;
        return pdf.getPage(pageNumber);
      }).then(function(page) {
        // console.log('Page loaded');

        var scale = 1.0;
        var viewport = page.getViewport({scale: scale});

        // Prepare canvas using PDF page dimensions
        var canvas = canvasEl;
        var context = canvas.getContext('2d');
        canvas.height = viewport.height;
        canvas.width = viewport.width;

        // Render PDF page into canvas context
        var renderContext = {
          canvasContext: context,
          viewport: viewport
        };
        var renderTask = page.render(renderContext);
        return renderTask.promise;
      }).then(function () {
        // console.log('Page rendered');
        let durl = canvasEl.toDataURL('image/jpeg');
        return durl;
      });
    }
    return Promise.reject(null);
  }

  function handleFiles(files) {
    const file = (files.length > 0) ? files[0] : undefined;
    const panel = document.getElementById('output');
    const spinner = document.getElementById('spinner');

    panel.setAttribute('data-closed', true);
    spinner.removeAttribute('data-closed');
    if (file && file.type === "application/pdf") {
      const name = file.name.split('.')[0];

      const reader = new FileReader();
      reader.onload = (e) => {
        console.log(e.target.result)
        renderPDF(e.target.result)
        .then((durl) => {
          const link = document.getElementById('link');
          link.setAttribute('href', durl)
          link.setAttribute('download', name + '.jpg');
          spinner.setAttribute('data-closed', true);
          panel.removeAttribute('data-closed');
        })
      }
      reader.readAsDataURL(file);
    }
  }

  function dragenter(e) {
    e.stopPropagation();
    e.preventDefault();
  }

  function dragover(e) {
    e.stopPropagation();
    e.preventDefault();
  }

  function drop(e) {
    e.stopPropagation();
    e.preventDefault();

    const dt = e.dataTransfer;
    const files = dt.files;

    handleFiles(files);
  }

  let dropbox = document.getElementById("dropbox");
  dropbox.addEventListener("dragenter", dragenter, false);
  dropbox.addEventListener("dragover", dragover, false);
  dropbox.addEventListener("drop", drop, false);
</script>
</body>
</html>