AngularJS - Generate a pdf from a byte array in ie9

Generating a PDF from a byte array in Internet Explorer 9 (IE9) can be a bit challenging due to the limited support for modern features in this older browser version. However, you can still achieve this by using a combination of libraries and techniques. Here's a step-by-step guide on how to do it:

1. Convert the Byte Array to Blob: Before generating the PDF, you need to convert the byte array to a Blob object. You can use the Uint8Array and Blob constructors for this purpose. Assuming you have a byte array named byteArray, you can convert it to a Blob like this:

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   // Convert byte array to Uint8Array
   var uint8Array = new Uint8Array(byteArray);
   
   // Convert Uint8Array to Blob
   var blob = new Blob([uint8Array], { type: 'application/pdf' });
   

2. Polyfills for Blob and Uint8Array: IE9 has limited support for Blobs and Typed Arrays (e.g., Uint8Array). To make them work, you'll need to use polyfills to add support for these features. One popular library for polyfilling Blob and Typed Arrays in IE9 is "Blob.js" and "TypedArray.js". Include these polyfills in your HTML file:

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   <!--[if IE]>
     <script src="https://cdnjs.cloudflare.com/ajax/libs/Blob.js/1.1.2/Blob.min.js"></script>
     <script src="https://cdnjs.cloudflare.com/ajax/libs/typedarray/0.1.5/typedarray.min.js"></script>
   <![endif]-->
   

3. Use PDF.js Library: Since IE9 doesn't support the modern Blob object directly, you can use the PDF.js library to display the PDF. PDF.js is a popular JavaScript library for rendering PDF documents directly in the browser without using any external plugins. It's compatible with IE9 and other modern browsers.

   Include the PDF.js library in your HTML file:

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   <script src="https://cdnjs.cloudflare.com/ajax/libs/pdf.js/2.8.335/pdf.min.js"></script>
   

4. Display the PDF: With the Blob and PDF.js set up, you can display the PDF using the PDFJS.getDocument method. For example:

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   PDFJS.getDocument(blob).then(function (pdf) {
     pdf.getPage(1).then(function (page) {
       var canvas = document.getElementById('pdf-canvas');
       var context = canvas.getContext('2d');
   
       var viewport = page.getViewport(1.0);
       canvas.height = viewport.height;
       canvas.width = viewport.width;
   
       var renderContext = {
         canvasContext: context,
         viewport: viewport
       };
       page.render(renderContext);
     });
   });
   

   In this example, we assume you have an HTML canvas element with the id pdf-canvas where the PDF will be rendered.

Keep in mind that working with older browsers like IE9 may require additional workarounds and compatibility considerations. PDF generation and rendering in older browsers might not offer the same level of support, performance, and features as in modern browsers. Consider encouraging users to upgrade to a more modern browser version that supports the latest web technologies for better user experience.