window.onload = function() {
//DsPdfViewer.LicenseKey = "***key***";
const viewer = new DsPdfViewer("#viewer", { pageDisplay: "TwoPageScrolling" });
viewer.toggleSidebar(false);
var pdfUrlToOpen = "/document-solutions/javascript-pdf-viewer/demos/product-bundles/assets/pdf/how-to-choose-js-framework.pdf";
viewer.open(pdfUrlToOpen).then(function() {
viewer.mouseMode = 1;
viewer.zoomValue = 30;
});
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>Two-page display view.</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/app.js"></script>
</head>
<body>
<div id="viewer"></div>
</body>
</html>
#viewer {
height: 100%;
}
