Solutions

Adil Shahbaz
Here is the code of preview image before it is uploaded.
Please make sure you have already added jquery reference.
function readImageUrl(input) {
if (input.files && input.files[0]) {
var reader = new FileReader();
reader.onload = function(e) {
$('#previewImg').attr('src', e.target.result);
}
reader.readAsDataURL(input.files[0]);
}
}
$("#uploadedImg").change(function() {
readImageUrl(this);
});
<input type='file' id="uploadedImg" />
<img id="previewImg" src="#" alt="Your Image" />