window.onload = function(){
var viewer = new DsPdfViewer("#viewer", getViewerOptions());
configureViewerUI(viewer);
viewer.open("/document-solutions/javascript-pdf-viewer/demos/product-bundles/assets/pdf/helloworld.pdf");
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>Merge pages from external PDF document programmatically</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="./src/styles.css">
<script src="/document-solutions/javascript-pdf-viewer/demos/product-bundles/build/dspdfviewer.js"></script>
<script src="/document-solutions/javascript-pdf-viewer/demos/product-bundles/build/wasmSupportApi.js"></script>
<script src="/document-solutions/javascript-pdf-viewer/demos/resource/js/init.js"></script>
<script src="./src/config.js"></script>
<script src="./src/app.js"></script>
</head>
<body>
<div id="viewer"></div>
</body>
</html>
#viewer {
height: 100%;
}
function getViewerOptions() {
return {
workerSrc: "/document-solutions/javascript-pdf-viewer/demos/product-bundles/build/dspdfviewer.worker.js",
supportApi: getSupportApiSettings(),
friendlyFileName: "sample.pdf",
restoreViewStateOnLoad: false
};
}
function configureViewerUI(viewer) {
viewer.addDefaultPanels();
viewer.toolbar.addItem({
text: "Select PDF to merge",
title: "Select external PDF to merge",
key: "merge-external-pdf",
enabled: false,
action: function() {
// Invoke the system file picker dialog
// to select an external PDF file to merge.
// Then, merge first page from selected PDF document and
// load result PDF into the viewer.
var fileInput = document.createElement('input');
fileInput.type = 'file';
fileInput.accept = ".pdf";
fileInput.onchange = function () {
if (fileInput.files && fileInput.files[0]) {
var fileReader = new FileReader();
fileReader.onload = function () {
const fileId = "uniquefileid_" + new Date().getTime();
viewer.storage.setItem(fileId, new Uint8Array(fileReader.result));
// Merge first page from external PDF document
// to the end of the active PDF document
// and load result PDF into the viewer:
viewer.save(
"sample.pdf",
{ pages: `0-${viewer.pageCount - 1}, [file:${fileId}]0`, reload: true }
);
};
fileReader.readAsArrayBuffer(fileInput.files[0]);
}
};
document.body.appendChild(fileInput);
fileInput.click();
},
onUpdate: function() { return { enabled: viewer.hasDocument && viewer.canEditDocument }; }
});
viewer.toolbarLayout.viewer.mobile = viewer.toolbarLayout.viewer.default = ["open", "merge-external-pdf", "$navigation", "zoom", "pdf-organizer", "save", "about"];
}
