How to draw photo with correct orientation in canvas after capture photo by using input[type='file'] in mobile web browser?

Question

I am making a simple web app in mobile which allow visitor to capture photo by using html5 input[type=file] element. Then I will display it on the web for preview, and then

Answer 1

If you just want the Orientation tag, using exif.js:

EXIF.getData(file, function () {
    alert(this.exifdata.Orientation);
});

In my tests, iOS camera only returns 1,3,6 or 8.