Load PDF documents dynamically

17 Feb 20222 minutes to read

The PDF Viewer server library allows to switch or load the PDF documents dynamically after the initial load operation. To achieve this, load the PDF document as a base64 string or file name in PDF Viewer control using the Load() method dynamically.

The following steps are used to load the PDF document dynamically.

Step 1: Follow the steps provided in the link to create a simple PDF Viewer sample.

Step 2: Use the following code snippet to load PDF document using base64 string.

<button type="button" onclick="load1()">LoadDocumentFromBase64</button>
<script>
    // Load a Base64 String
function load1() {
    // Sending Ajax request to the controller to get base 64 string
    $.ajax({
        url: '/PdfViewer/GetDocument',
        type: 'POST',
        cache: false,
        processData: false,
        contentType: false,
        success: function (data) {
            debugger;
            var viewer = document.getElementById('pdfViewer').ej2_instances[0];
            viewer.load(data, null);
        },
        error: function (msg, textStatus, errorThrown) {
            debugger;
            alert('Exception' + msg.responseText);
        }
    });
}
</script>

Step 3: Add the following code snippet in PdfViewerController.cs file to get the base64 string of the given document.

 public ActionResult GetDocument()
{
    var docBytes = System.IO.File.ReadAllBytes(GetDocumentPath("PDF_Succinctly.pdf"));
    string docBase64 = "data:application/pdf;base64," + Convert.ToBase64String(docBytes);
    return Content(docBase64);
}

Step 4: Use the following code snippet to load PDF document using document name.

<button type="button" onclick="load2()">LoadDocumentFromBase64</button>
<script>
// load document using document name.
function load2() {
    var viewer = document.getElementById('pdfViewer').ej2_instances[0];
    viewer.load("HTTP Succinctly.pdf", null)
}
</script>

TIPS

Also can add the base64 string directly in the DocumentPath() method.

Download the sample, how to load PDF documents dynamically