JSFiddle - React, Tailwind, and code Playground
HTML
<input id="settings_img" type='file' />
<div id="settings_img_elm"></div>
CSS
#settings_img_elm {
width: 400px;
height: 400px;
background-image: linear-gradient(lightgrey, black);
}
.imagePreview {
width: 400px;
height: 400px;
object-fit: contain;
margin: auto;
vertical-align: middle;
}
JavaScript
function imagePreview(input,elm) {
if (input.files && input.files[0]) {
var reader = new FileReader();
reader.onload = function (e) {
$(elm).html('<img class="imagePreview" src="'+e.target.result+'">');
}
reader.readAsDataURL(input.files[0]);
}
}
$("#settings_img").on("change",function(){
imagePreview(this,"#settings_img_elm");
getOrientation(this.files[0], function(orientation) {
correctOrientation( $('.imagePreview'), orientation);
});
});
function getOrientation(file, callback) {
var reader = new FileReader();
reader.onload = function(e) {
var view = new DataView(e.target.result);
if (view.getUint16(0, false) != 0xFFD8)
{
return callback(-2);
}
var length = view.byteLength, offset = 2;
while (offset < length)
{
if (view.getUint16(offset+2, false) <= 8) return callback(-1);
var marker = view.getUint16(offset, false);
offset += 2;
if (marker == 0xFFE1)
{
if (view.getUint32(offset += 2, false) != 0x45786966)
{
return callback(-1);
}
var little = view.getUint16(offset += 6, false) == 0x4949;
offset += view.getUint32(offset + 4, little);
var tags = view.getUint16(offset, little);
offset += 2;
for (var i = 0; i < tags; i++)
{
if (view.getUint16(offset + (i * 12), little) == 0x0112)
{
return callback(view.getUint16(offset + (i * 12) + 8, little));
}
}
}
else if ((marker & 0xFF00) != 0xFF00)
{
break;
}
else
{
offset += view.getUint16(offset, false);
}
}
return callback(-1);
};
...