Image Preview Before Uploading Using JavaScript

In this tutorial i will show you how to Image Display Before Uploading Using JavaScript. You can see demo on click below button and source code also available here.

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Step to display image before uploading using JavaScript.

To display image before uploading using JavaScript we need to follow below all steps

  • Create HTML File
  • Create CSS File
  • Generate JavaScript

1: Create HTML File

First of all we create a index.html file and in head section we need to connection with style.css file. Below all codes paste in body section

	<div class="container">
		<form action="" method="post" enctype="multipart/form-data">
			<input type="file" id="image" onchange="loadfile(event)">
			<label for="image">
				Choose a Photo
			<input type="submit" value="Upload" class="btn">

		<img id="preimage" src="default.png">

In above code, we create a form and input file with input submit button and in the last we create a img tag for displaying image before uploading.

2: Create CSS File

Second we create a style.css file and make sure css file connected with index file.

	margin: 0;
	padding: 0;
	width: 100%;
	height: 100vh;
	display: flex;
	justify-content: center;
	align-items: center;
	position: relative;
	width: 50%;
	padding: 20px;
	background-color: #c9c9c9;
	border-radius: 10px;
	float: left;
	width: 50%;
	display: none;
	color: white;
	height: 40px;
	width: 40%;
	border-radius: 20px;
	background: linear-gradient(180deg,#32a852,#03d1ff);
	position: absolute;
	font-size: 18px;
	text-align: center;
	line-height: 40px;
	float: right;
	width: 50%;
	height: 40px;
	border-radius: 20px;
	background: linear-gradient(180deg,#32a852,#03d1ff);
	background-size: 300%;
	color: #fff;
	cursor: pointer;
	font-size: 18px;
	width: 100%;
	margin-top: 10px;
	border-radius: 10px;

In above code, we create a style on input [type file], input [type submit] and also style on img tag.

3: Generate JavaScript

Third, we generate a JavaScript code for display image when we select from location before uploading. this below code copy and paste in end of body section.

	<script type="text/javascript">
		function loadfile(event){
			var output = document.getElementById('preimage');
			output.src = URL.createObjectURL([0]);

In above code, this code to action for display image.


Today we learnt how to display image before uploading using JavaScript.

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