Preview PDF/Image file before upload

You have an input, check the onChange and then make a 

 src= URL.createObjectURL(event.target.files[0])

to create URL: and then use it to preview with embed

<embed  
       src=src
       width="250"
       height="200">

Read more here https://developer.mozilla.org/en-US/docs/Web/HTML/Element/embed


you can use javascript pdf library like this one (i'm using pdf.js) from this link : https://mozilla.github.io/pdf.js/examples/index.html#interactive-examples

// Loaded via <script> tag, create shortcut to access PDF.js exports.
var pdfjsLib = window['pdfjs-dist/build/pdf'];
// The workerSrc property shall be specified.
pdfjsLib.GlobalWorkerOptions.workerSrc = 'https://mozilla.github.io/pdf.js/build/pdf.worker.js';

$("#myPdf").on("change", function(e){
	var file = e.target.files[0]
	if(file.type == "application/pdf"){
		var fileReader = new FileReader();  
		fileReader.onload = function() {
			var pdfData = new Uint8Array(this.result);
			// Using DocumentInitParameters object to load binary data.
			var loadingTask = pdfjsLib.getDocument({data: pdfData});
			loadingTask.promise.then(function(pdf) {
			  console.log('PDF loaded');
			  
			  // Fetch the first page
			  var pageNumber = 1;
			  pdf.getPage(pageNumber).then(function(page) {
				console.log('Page loaded');
				
				var scale = 1.5;
				var viewport = page.getViewport({scale: scale});

				// Prepare canvas using PDF page dimensions
				var canvas = $("#pdfViewer")[0];
				var context = canvas.getContext('2d');
				canvas.height = viewport.height;
				canvas.width = viewport.width;

				// Render PDF page into canvas context
				var renderContext = {
				  canvasContext: context,
				  viewport: viewport
				};
				var renderTask = page.render(renderContext);
				renderTask.promise.then(function () {
				  console.log('Page rendered');
				});
			  });
			}, function (reason) {
			  // PDF loading error
			  console.error(reason);
			});
		};
		fileReader.readAsArrayBuffer(file);
	}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://mozilla.github.io/pdf.js/build/pdf.js"></script>

<input type="file" id="myPdf" /><br>
<canvas id="pdfViewer"></canvas>

Tags:

Javascript

Html

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