В исходниках все давным-давно реализовано
$('button[id^=\'button-upload\']').on('click', function() {
var node = this;
$('#form-upload').remove();
$('body').prepend('<form enctype="multipart/form-data" id="form-upload" style="display: none;"><input type="file" name="file" /></form>');
$('#form-upload input[name=\'file\']').trigger('click');
if (typeof timer != 'undefined') {
clearInterval(timer);
}
timer = setInterval(function() {
if ($('#form-upload input[name=\'file\']').val() != '') {
clearInterval(timer);
$.ajax({
url: 'index.php?route=tool/upload',
type: 'post',
dataType: 'json',
data: new FormData($('#form-upload')[0]),
cache: false,
contentType: false,
processData: false,
beforeSend: function() {
$(node).button('loading');
},
complete: function() {
$(node).button('reset');
},
success: function(json) {
$('.text-danger').remove();
if (json['error']) {
$(node).parent().find('input').after('<div class="text-danger">' + json['error'] + '</div>');
}
if (json['success']) {
alert(json['success']);
$(node).parent().find('input').val(json['code']);
}
},
error: function(xhr, ajaxOptions, thrownError) {
alert(thrownError + "\r\n" + xhr.statusText + "\r\n" + xhr.responseText);
}
});
}
}, 500);
});