pdf.js javascript实现pdf阅读器
https://github.com/mozilla/pdf.js 可在该网站下载到pdf.js
pdf.js 升级至 1.0 版本，并且将成为未来 Firefox 内嵌的 PDF 阅读器。
和 Google Chrome 使用的源自 Foxit 的闭源 PDF 浏览插件不同，PDF.js 是基于开放的 HTML5 及 JavaScript 技术实现的开源产品。
<html>
<body>
<div>
<button id="prev" onclick="goPrevious()">Previous</button>
<button id="next" onclick="goNext()">Next</button>
<span>Page: <span id="page_num"></span> / <span id="page_count"></span></span>
</div>
<div>
<canvas id="the-canvas" style="border:1px solid black"></canvas>
</div>
<!-- Use latest PDF.js build from Github -->
<script type="text/javascript" src="https://raw.github.com/mozilla/pdf.js/gh-pages/build/pdf.js"></script>
<script type="text/javascript">
//
// NOTE:
// Modifying the URL below to another server will likely *NOT* work. Because of browser
// security restrictions, we have to use a file server with special headers
// (CORS) - most servers don't support cross-origin browser requests.
//
var url = 'http://cdn.mozilla.net/pdfjs/tracemonkey.pdf';
//
// Disable workers to avoid yet another cross-origin issue (workers need the URL of
// the script to be loaded, and currently do not allow cross-origin scripts)
//
PDFJS.disableWorker = true;
var pdfDoc = null,
pageNum = 1,
scale = 0.8,
canvas = document.getElementById('the-canvas'),
ctx = canvas.getContext('2d');
//
// Get page info from document, resize canvas accordingly, and render page
//
function renderPage(num) {
// Using promise to fetch the page
pdfDoc.getPage(num).then(function(page) {
var viewport = page.getViewport(scale);
canvas.height = viewport.height;
canvas.width = viewport.width;
// Render PDF page into canvas context
var renderContext = {
canvasContext: ctx,
viewport: viewport
};
page.render(renderContext);
});
// Update page counters
document.getElementById('page_num').textContent = pageNum;
document.getElementById('page_count').textContent = pdfDoc.numPages;
}
//
// Go to previous page
//
function goPrevious() {
if (pageNum <= 1)
return;
pageNum--;
renderPage(pageNum);
}
//
// Go to next page
//
function goNext() {
if (pageNum >= pdfDoc.numPages)
return;
pageNum++;
renderPage(pageNum);
}
//
// Asynchronously download PDF as an ArrayBuffer
//
PDFJS.getDocument(url).then(function getPdfHelloWorld(_pdfDoc) {
pdfDoc = _pdfDoc;
renderPage(pageNum);
});
</script>
</body>
</html>
所有需要导入的js文件如下：
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
<title>PDF.js viewer</title>
<!--#if FIREFOX || MOZCENTRAL-->
<!--#include viewer-snippet-firefox-extension.html-->
<!--#endif-->
<link rel="stylesheet" href="viewer.css"/>
<!--#if !PRODUCTION-->
<link rel="resource" type="application/l10n" href="locale.properties"/>
<!--#endif-->
<!--#if !(FIREFOX || MOZCENTRAL)-->
<script type="text/javascript" src="compatibility.js"></script>
<!--#endif-->
<!--#if !PRODUCTION-->
<script type="text/javascript" src="../external/webL10n/l10n.js"></script>
<!--#endif-->
<!--#if !PRODUCTION-->
<script type="text/javascript" src="../src/core.js"></script>
<script type="text/javascript" src="../src/util.js"></script>
<script type="text/javascript" src="../src/api.js"></script>
<script type="text/javascript" src="../src/metadata.js"></script>
<script type="text/javascript" src="../src/canvas.js"></script>
<script type="text/javascript" src="../src/obj.js"></script>
<script type="text/javascript" src="../src/function.js"></script>
<script type="text/javascript" src="../src/charsets.js"></script>
<script type="text/javascript" src="../src/cidmaps.js"></script>
<script type="text/javascript" src="../src/colorspace.js"></script>
<script type="text/javascript" src="../src/crypto.js"></script>
<script type="text/javascript" src="../src/evaluator.js"></script>
<script type="text/javascript" src="../src/fonts.js"></script>
<script type="text/javascript" src="../src/glyphlist.js"></script>
<script type="text/javascript" src="../src/image.js"></script>
<script type="text/javascript" src="../src/metrics.js"></script>
<script type="text/javascript" src="../src/parser.js"></script>
<script type="text/javascript" src="../src/pattern.js"></script>
<script type="text/javascript" src="../src/stream.js"></script>
<script type="text/javascript" src="../src/worker.js"></script>
<script type="text/javascript" src="../external/jpgjs/jpg.js"></script>
<script type="text/javascript" src="../src/jpx.js"></script>
<script type="text/javascript" src="../src/jbig2.js"></script>
<script type="text/javascript" src="../src/bidi.js"></script>
<script type="text/javascript">PDFJS.workerSrc = '../src/worker_loader.js';</script>
<!--#endif-->
<!--#if GENERIC || CHROME-->
<!--#include viewer-snippet.html-->
<!--#endif-->
<!--#if B2G-->
<!--#include viewer-snippet-b2g.html-->
<!--#endif-->
<script type="text/javascript" src="debugger.js"></script>
<script type="text/javascript" src="viewer.js"></script>
</head>
http://mozilla.github.com/pdf.js/web/viewer.html 一个更加完整的例子如下：
<!DOCTYPE html>
<html dir="ltr">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
<title>PDF.js viewer</title>
<link rel="stylesheet" href="viewer.css"/>
<script type="text/javascript" src="compatibility.js"></script>
<!-- This snippet is used in production, see Makefile -->
<link rel="resource" type="application/l10n" href="locale.properties"/>
<script type="text/javascript" src="l10n.js"></script>
<script type="text/javascript" src="../build/pdf.js"></script>
<script type="text/javascript">
// This specifies the location of the pdf.js file.
PDFJS.workerSrc = "../build/pdf.js";
</script>
<script type="text/javascript" src="debugger.js"></script>
<script type="text/javascript" src="viewer.js"></script>
</head>
<body>
<div id="outerContainer">
<div id="sidebarContainer">
<div id="toolbarSidebar" class="splitToolbarButton toggled">
<button id="viewThumbnail" class="toolbarButton group toggled" title="Show Thumbnails" onclick="PDFView.switchSidebarView('thumbs')" tabindex="1" data-l10n-id="thumbs">
<span data-l10n-id="thumbs_label">Thumbnails</span>
</button>
<button id="viewOutline" class="toolbarButton group" title="Show Document Outline" onclick="PDFView.switchSidebarView('outline')" tabindex="2" data-l10n-id="outline">
<span data-l10n-id="outline_label">Document Outline</span>
</button>
<button id="viewSearch" class="toolbarButton group hidden" title="Search Document" onclick="PDFView.switchSidebarView('search')" tabindex="3" data-l10n-id="search_panel">
<span data-l10n-id="search_panel_label">Search Document</span>
</button>
</div>
<div id="sidebarContent">
<div id="thumbnailView">
</div>
<div id="outlineView" class="hidden">
</div>
<div id="searchView" class="hidden">
<div id="searchToolbar">
<input id="searchTermsInput" class="toolbarField" onkeydown='if (event.keyCode == 13) PDFView.search()'>
<button id="searchButton" class="textButton toolbarButton" onclick='PDFView.search()' data-l10n-id="search">Find</button>
</div>
<div id="searchResults"></div>
</div>
</div>
</div> <!-- sidebarContainer -->
<div id="mainContainer">
<div class="toolbar">
<div id="toolbarContainer">
<div id="toolbarViewer">
<div id="toolbarViewerLeft">
<button id="sidebarToggle" class="toolbarButton" title="Toggle Sidebar" tabindex="4" data-l10n-id="toggle_slider">
<span data-l10n-id="toggle_slider_label">Toggle Sidebar</span>
</button>
<div class="toolbarButtonSpacer"></div>
<div class="splitToolbarButton">
<button class="toolbarButton pageUp" title="Previous Page" onclick="PDFView.page--" id="previous" tabindex="5" data-l10n-id="previous">
<span data-l10n-id="previous_label">Previous</span>
</button>
<div class="splitToolbarButtonSeparator"></div>
<button class="toolbarButton pageDown" title="Next Page" onclick="PDFView.page++" id="next" tabindex="6" data-l10n-id="next">
<span data-l10n-id="next_label">Next</span>
</button>
</div>
<label id="pageNumberLabel" class="toolbarLabel" for="pageNumber" data-l10n-id="page_label">Page: </label>
<input type="number" id="pageNumber" class="toolbarField pageNumber" onchange="PDFView.page = this.value;" value="1" size="4" min="1" tabindex="7">
</input>
<span id="numPages" class="toolbarLabel"></span>
</div>
<div id="toolbarViewerRight">
<input id="fileInput" class="fileInput" type="file" oncontextmenu="return false;" style="visibility: hidden; position: fixed; right: 0; top: 0" />
<button id="fullscreen" class="toolbarButton fullscreen" title="Fullscreen" tabindex="11" data-l10n-id="fullscreen" onclick="PDFView.fullscreen();">
<span data-l10n-id="fullscreen_label">Fullscreen</span>
</button>
<button id="openFile" class="toolbarButton openFile" title="Open File" tabindex="12" data-l10n-id="open_file" onclick="document.getElementById('fileInput').click()">
<span data-l10n-id="open_file_label">Open</span>
</button>
<button id="print" class="toolbarButton print" title="Print" tabindex="13" data-l10n-id="print" onclick="window.print()">
<span data-l10n-id="print_label">Print</span>
</button>
<button id="download" class="toolbarButton download" title="Download" onclick="PDFView.download();" tabindex="14" data-l10n-id="download">
<span data-l10n-id="download_label">Download</span>
</button>
<!-- <div class="toolbarButtonSpacer"></div> -->
<a href="#" id="viewBookmark" class="toolbarButton bookmark" title="Current view (copy or open in new window)" tabindex="15" data-l10n-id="bookmark"><span data-l10n-id="bookmark_label">Current View</span></a>
</div>
<div class="outerCenter">
<div class="innerCenter" id="toolbarViewerMiddle">
<div class="splitToolbarButton">
<button class="toolbarButton zoomOut" title="Zoom Out" onclick="PDFView.zoomOut();" tabindex="8" data-l10n-id="zoom_out">
<span data-l10n-id="zoom_out_label">Zoom Out</span>
</button>
<div class="splitToolbarButtonSeparator"></div>
<button class="toolbarButton zoomIn" title="Zoom In" onclick="PDFView.zoomIn();" tabindex="9" data-l10n-id="zoom_in">
<span data-l10n-id="zoom_in_label">Zoom In</span>
</button>
</div>
<span id="scaleSelectContainer" class="dropdownToolbarButton">
<select id="scaleSelect" onchange="PDFView.parseScale(this.value);" title="Zoom" oncontextmenu="return false;" tabindex="10" data-l10n-id="zoom">
<option id="pageAutoOption" value="auto" selected="selected" data-l10n-id="page_scale_auto">Automatic Zoom</option>
<option id="pageActualOption" value="page-actual" data-l10n-id="page_scale_actual">Actual Size</option>
<option id="pageFitOption" value="page-fit" data-l10n-id="page_scale_fit">Fit Page</option>
<option id="pageWidthOption" value="page-width" data-l10n-id="page_scale_width">Full Width</option>
<option id="customScaleOption" value="custom"></option>
<option value="0.5">50%</option>
<option value="0.75">75%</option>
<option value="1">100%</option>
<option value="1.25">125%</option>
<option value="1.5">150%</option>
<option value="2">200%</option>
</select>
</span>
</div>
</div>
</div>
</div>
</div>
<div id="viewerContainer">
<div id="viewer"></div>
</div>
<div id="loadingBox">
<div id="loading"></div>
<div id="loadingBar"><div class="progress"></div></div>
</div>
<div id="errorWrapper" hidden='true'>
<div id="errorMessageLeft">
<span id="errorMessage"></span>
<button id="errorShowMore" onclick="" oncontextmenu="return false;" data-l10n-id="error_more_info">
More Information
</button>
<button id="errorShowLess" onclick="" oncontextmenu="return false;" data-l10n-id="error_less_info" hidden='true'>
Less Information
</button>
</div>
<div id="errorMessageRight">
<button id="errorClose" oncontextmenu="return false;" data-l10n-id="error_close">
Close
</button>
</div>
<div class="clearBoth"></div>
<textarea id="errorMoreInfo" hidden='true' readonly="readonly"></textarea>
</div>
</div> <!-- mainContainer -->
</div> <!-- outerContainer -->
<div id="printContainer"></div>
</body>
</html>