upload-file-image.js

//JS
$(function () {
    $(":file").change(function () {
        if (this.files && this.files[0]) {
            var reader = new FileReader();
            reader.onload = imageIsLoaded;
            reader.readAsDataURL(this.files[0]);
        }
    });
});

function imageIsLoaded(e) {
    $('#image-container').attr('src', e.target.result);
};

//HTML
/*
<input type='file' />
<img id="image-container" src="#" alt="your image" />
*/

//source: http://jsfiddle.net/vacidesign/ja0tyj0f/