HTML script
<html>
<head>
<script type="text/javascript">
function preview_image(event)
{
var reader = new FileReader();
reader.onload = function()
{
var output = document.getElementById('output_image');
output.src = reader.result;
}
reader.readAsDataURL(event.target.files[0]);
}
</script>
</head>
<body>
<form method="POST" action="" enctype="multipart/form-data">
<input type="file" name="abc" accept="image/*" onchange="preview_image(event)">
<button type="submit" name="submit_form_button" >Submit</button>
<img id="output_image" width="90%"/>
</form>
</body>
</html>
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References