app/assets/javascripts/file_uploader.js
$(document).ready(function () {
$('.file-uploader').click(function () {
/* Act on the event */
$('#event_photo_upload').trigger('click');
});
$('#event_photo_upload').change(function () {
/* Act on the event */
var reader = new FileReader();
reader.onload = function (e) {
$('#index-banner').css('background', 'url(' + e.target.result + ')');
};
var uploaded_file = $(this)[0].files[0];
reader.readAsDataURL(uploaded_file);
$('.events_pic_name').html(uploaded_file.name);
});
});