JavaのWebアプリケーション開発フレームワークによる、Webサイト開発の顛末記です。

EclipseのMavenを使った、Spring-MVC、Thymeleaf、MyBatis 等のプログラミングテクニックを、
備忘録的に記録しています。実際に動くソースコードを多用して説明していますので、
これからEclipseや、Spring-MVCを始めたいと思っている人にとって、少しでも参考になれば幸いです。
Spring-MVCの散歩道 > 応用の森(jQuery/JavaScript 編) > dropzone.jsを使用した、Ajaxでのファイルアップロードサンプル 
@charset "UTF-8";
/*
Local Font
----------------------------------------------------------------
*/

@font-face {
  font-family: SpicaNeueP-Regular;
  src: url("../fonts/spicaneue/SpicaNeueP-Regular.ttf") format("truetype");
  font-weight: normal;
}

@font-face {
  font-family: SpicaNeueP-Bold;
  src: url("../fonts/spicaneue/SpicaNeueP-Bold.ttf") format("truetype");
  font-weight: bold;
}

/*
Glyphicon
----------------------------------------------------------------
*/
@font-face {
  font-family: 'UI-icons';
  src: url("../fonts/ui-icons-regular.eot");
  src: url("../fonts/ui-icons-regular.eot?#iefix") format("embedded-opentype"), url("../fonts/ui-icons-regular.woff") format("woff"), url("../fonts/ui-icons-regular.ttf") format("truetype"), url("../fonts/ui-icons-regular.svg#") format("svg");
  font-weight: normal;
  font-style: normal;
}

/* Use the following CSS code if you want to use data attributes for inserting your icons */
[data-icon]:before {
  font-family: 'UI-icons';
  content: attr(data-icon);
  speak: none;
  font-weight: normal;
  font-variant: normal;
  text-transform: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Use the following CSS code if you want to have a class per icon */
[class^="icon-ui-"], [class*=" icon-ui-"] {
  font-family: 'UI-icons';
  speak: none;
  font-style: normal;
  font-weight: normal;
  font-variant: normal;
  text-transform: none;
  line-height: 1;
  /* Better Font Rendering =========== */
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
.icon-ui-file:before {
  content: "¥e022";
}

/*
Button group
----------------------------------------------------------------
*/
.btn-default .caret {
  border-top-color: white;
}
.btn-primary .caret, .btn-success .caret, .btn-warning .caret, .btn-danger .caret, .btn-info .caret {
  border-top-color: white;
}

.dropup .btn-default .caret {
  border-bottom-color: white;
}
.dropup .btn-primary .caret,
.dropup .btn-success .caret,
.dropup .btn-warning .caret,
.dropup .btn-danger .caret,
.dropup .btn-info .caret {
  border-bottom-color: white;
}

.btn-group > .btn + .btn {
  margin-left: -1px;
}
.btn-group > .btn + .dropdown-toggle {
  border-left: 1px solid #c6cfd4;
  padding-left: 12px;
  padding-right: 12px;
}
.btn-group > .btn + .dropdown-toggle .caret {
  margin: 5px 3px 5px;
}
.btn-group > .btn + .dropdown-toggle.btn-primary {
  border-left-color: #80d1fa;
}
.btn-group > .btn + .dropdown-toggle.btn-success {
  border-left-color: #80d1fa;
}
.btn-group > .btn + .dropdown-toggle.btn-info {
  border-left-color: #89ded7;
}
.btn-group > .btn + .dropdown-toggle.btn-warning {
  border-left-color: #dfe78b;
}
.btn-group > .btn + .dropdown-toggle.btn-danger {
  border-left-color: #faacb4;
}
.btn-group > .btn + .dropdown-toggle.btn-inverse {
  border-left-color: #dbe0e3;
}
.btn-group > .btn.btn-gh + .dropdown-toggle .caret {
  margin-left: 7px;
  margin-right: 7px;
}
.btn-group > .btn.btn-sm + .dropdown-toggle .caret, .btn-group-sm.btn-group > .btn + .dropdown-toggle .caret {
  margin: 5px 3px 3px;
}
.btn-group > .btn.btn-lg + .dropdown-toggle .caret, .btn-group-lg.btn-group > .btn + .dropdown-toggle .caret {
  margin: 8px 3px 7px;
}
.btn-group > .btn.btn-hg + .dropdown-toggle .caret, .btn-group-gh.btn-group > .btn + .dropdown-toggle .caret {
  margin: 10px 3px 8px;
}

.dropdown-toggle .caret {
  margin-left: 8px;
}

.btn-group > .btn,
.btn-group > .dropdown-menu,
.btn-group > .popover {
  font-weight: 400;
}

.btn-group:focus .dropdown-toggle {
  outline: none;
  -webkit-transition: 0.25s;
  -moz-transition: 0.25s;
  -o-transition: 0.25s;
  transition: 0.25s;
}

.btn-group.open .dropdown-toggle {
  color: fade(white, 75%);
  -webkit-box-shadow: none;
  -moz-box-shadow: none;
  box-shadow: none;
}

.btn-toolbar .btn.active {
  color: white;
}

/*
File Upload using Dropzone.js
----------------------------------------------------------------
*/
@-webkit-keyframes passing-through {
  0% {
    filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=0);
    opacity: 0;
    -webkit-transform: translateY(40px);
    -moz-transform: translateY(40px);
    -ms-transform: translateY(40px);
    -o-transform: translateY(40px);
    transform: translateY(40px);
  }

  30%, 70% {
    filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=100);
    opacity: 1;
    -webkit-transform: translateY(0px);
    -moz-transform: translateY(0px);
    -ms-transform: translateY(0px);
    -o-transform: translateY(0px);
    transform: translateY(0px);
  }

  100% {
    filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=0);
    opacity: 0;
    -webkit-transform: translateY(-40px);
    -moz-transform: translateY(-40px);
    -ms-transform: translateY(-40px);
    -o-transform: translateY(-40px);
    transform: translateY(-40px);
  }
}

@-moz-keyframes passing-through {
  0% {
    filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=0);
    opacity: 0;
    -webkit-transform: translateY(40px);
    -moz-transform: translateY(40px);
    -ms-transform: translateY(40px);
    -o-transform: translateY(40px);
    transform: translateY(40px);
  }

  30%, 70% {
    filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=100);
    opacity: 1;
    -webkit-transform: translateY(0px);
    -moz-transform: translateY(0px);
    -ms-transform: translateY(0px);
    -o-transform: translateY(0px);
    transform: translateY(0px);
  }

  100% {
    filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=0);
    opacity: 0;
    -webkit-transform: translateY(-40px);
    -moz-transform: translateY(-40px);
    -ms-transform: translateY(-40px);
    -o-transform: translateY(-40px);
    transform: translateY(-40px);
  }
}

@keyframes passing-through {
  0% {
    filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=0);
    opacity: 0;
    -webkit-transform: translateY(40px);
    -moz-transform: translateY(40px);
    -ms-transform: translateY(40px);
    -o-transform: translateY(40px);
    transform: translateY(40px);
  }

  30%, 70% {
    filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=100);
    opacity: 1;
    -webkit-transform: translateY(0px);
    -moz-transform: translateY(0px);
    -ms-transform: translateY(0px);
    -o-transform: translateY(0px);
    transform: translateY(0px);
  }

  100% {
    filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=0);
    opacity: 0;
    -webkit-transform: translateY(-40px);
    -moz-transform: translateY(-40px);
    -ms-transform: translateY(-40px);
    -o-transform: translateY(-40px);
    transform: translateY(-40px);
  }
}

@-webkit-keyframes slide-in {
  0% {
    filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=0);
    opacity: 0;
    -webkit-transform: translateY(40px);
    -moz-transform: translateY(40px);
    -ms-transform: translateY(40px);
    -o-transform: translateY(40px);
    transform: translateY(40px);
  }

  30% {
    filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=100);
    opacity: 1;
    -webkit-transform: translateY(0px);
    -moz-transform: translateY(0px);
    -ms-transform: translateY(0px);
    -o-transform: translateY(0px);
    transform: translateY(0px);
  }
}

@-moz-keyframes slide-in {
  0% {
    filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=0);
    opacity: 0;
    -webkit-transform: translateY(40px);
    -moz-transform: translateY(40px);
    -ms-transform: translateY(40px);
    -o-transform: translateY(40px);
    transform: translateY(40px);
  }

  30% {
    filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=100);
    opacity: 1;
    -webkit-transform: translateY(0px);
    -moz-transform: translateY(0px);
    -ms-transform: translateY(0px);
    -o-transform: translateY(0px);
    transform: translateY(0px);
  }
}

@keyframes slide-in {
  0% {
    filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=0);
    opacity: 0;
    -webkit-transform: translateY(40px);
    -moz-transform: translateY(40px);
    -ms-transform: translateY(40px);
    -o-transform: translateY(40px);
    transform: translateY(40px);
  }

  30% {
    filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=100);
    opacity: 1;
    -webkit-transform: translateY(0px);
    -moz-transform: translateY(0px);
    -ms-transform: translateY(0px);
    -o-transform: translateY(0px);
    transform: translateY(0px);
  }
}

@-webkit-keyframes pulse {
  0% {
    -webkit-transform: scale(1, 1);
    -moz-transform: scale(1, 1);
    -ms-transform: scale(1, 1);
    -o-transform: scale(1, 1);
    transform: scale(1, 1);
  }

  10% {
    -webkit-transform: scale(1.1, 1.1);
    -moz-transform: scale(1.1, 1.1);
    -ms-transform: scale(1.1, 1.1);
    -o-transform: scale(1.1, 1.1);
    transform: scale(1.1, 1.1);
  }

  20% {
    -webkit-transform: scale(1, 1);
    -moz-transform: scale(1, 1);
    -ms-transform: scale(1, 1);
    -o-transform: scale(1, 1);
    transform: scale(1, 1);
  }
}

@-moz-keyframes pulse {
  0% {
    -webkit-transform: scale(1, 1);
    -moz-transform: scale(1, 1);
    -ms-transform: scale(1, 1);
    -o-transform: scale(1, 1);
    transform: scale(1, 1);
  }

  10% {
    -webkit-transform: scale(1.1, 1.1);
    -moz-transform: scale(1.1, 1.1);
    -ms-transform: scale(1.1, 1.1);
    -o-transform: scale(1.1, 1.1);
    transform: scale(1.1, 1.1);
  }

  20% {
    -webkit-transform: scale(1, 1);
    -moz-transform: scale(1, 1);
    -ms-transform: scale(1, 1);
    -o-transform: scale(1, 1);
    transform: scale(1, 1);
  }
}

@keyframes pulse {
  0% {
    -webkit-transform: scale(1, 1);
    -moz-transform: scale(1, 1);
    -ms-transform: scale(1, 1);
    -o-transform: scale(1, 1);
    transform: scale(1, 1);
  }

  10% {
    -webkit-transform: scale(1.1, 1.1);
    -moz-transform: scale(1.1, 1.1);
    -ms-transform: scale(1.1, 1.1);
    -o-transform: scale(1.1, 1.1);
    transform: scale(1.1, 1.1);
  }

  20% {
    -webkit-transform: scale(1, 1);
    -moz-transform: scale(1, 1);
    -ms-transform: scale(1, 1);
    -o-transform: scale(1, 1);
    transform: scale(1, 1);
  }
}

.dropzone,
.dropzone * {
  box-sizing: border-box;
}

.dropzone {
  min-height: 154px;
  border: 1px dashed #b5c1c6;
  color: #b5c1c6;
  background-color: #fafbfb;
  margin-bottom: 16px;
  padding-left: 6px;
}
.dropzone.dz-clickable {
  cursor: pointer;
}
.dropzone.dz-clickable * {
  cursor: default;
}
.dropzone.dz-clickable .dz-message,
.dropzone.dz-clickable .dz-message * {
  cursor: pointer;
}
.dropzone.dz-started .dz-message {
  display: none;
}
.dropzone.dz-drag-hover {
  border-style: solid;
}
.dropzone.dz-drag-hover .dz-message {
  filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=50);
  opacity: 0.5;
}
.dropzone span {
  display: block;
}
.dropzone span.icon {
  margin-bottom: 8px;
  font-size: 32px;
  color: #b5c1c6;
}
.dropzone small {
  display: block;
}
.dropzone .dz-message {
  text-align: center;
  margin: 2em 0 0;
  margin-left: -3px;
}
.dropzone .dz-preview {
  position: relative;
  display: inline-block;
  vertical-align: top;
  margin: 16px 12px;
  min-height: 100px;
}
.dropzone .dz-preview:hover {
  z-index: 1000;
}
.dropzone .dz-preview:hover .dz-details {
  filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=100);
  opacity: 1;
}
.dropzone .dz-preview:hover .dz-image:after {
  display: block;
  width: 100%;
  height: 152px;
  background-color: rgba(49, 61, 66, 0.8);
}
.dropzone .dz-preview:hover .dz-image img {
  -webkit-transform: scale(1.05, 1.05);
  -moz-transform: scale(1.05, 1.05);
  -ms-transform: scale(1.05, 1.05);
  -o-transform: scale(1.05, 1.05);
  transform: scale(1.05, 1.05);
  -webkit-filter: blur(8px);
  -moz-filter: blur(8px);
  filter: blur(8px);
}
.dropzone .dz-preview.dz-file-preview .dz-image {
  -webkit-border-radius: 1px;
  -moz-border-radius: 1px;
  -ms-border-radius: 1px;
  -o-border-radius: 1px;
  border-radius: 1px;
  background: #999;
  background: linear-gradient(to bottom, #eeeeee, #dddddd);
}
.dropzone .dz-preview.dz-file-preview .dz-details {
  filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=100);
  opacity: 1;
}
.dropzone .dz-preview.dz-image-preview .dz-details {
  -webkit-transition: opacity, 0.2s linear;
  -moz-transition: opacity, 0.2s linear;
  -o-transition: opacity, 0.2s linear;
  transition: opacity, 0.2s linear;
}
.dropzone .dz-preview.dz-success .dz-success-mark {
  -webkit-animation: passing-through 9s cubic-bezier(0.77, 0, 0.175, 1);
  -moz-animation: passing-through 9s cubic-bezier(0.77, 0, 0.175, 1);
  animation: passing-through 9s cubic-bezier(0.77, 0, 0.175, 1);
  -webkit-animation-fill-mode: both;
  -moz-animation-fill-mode: both;
  animation-fill-mode: both;
}
.dropzone .dz-preview.dz-error:hover .dz-error-message {
  filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=100);
  opacity: 1;
  pointer-events: auto;
}
.dropzone .dz-preview.dz-error .dz-error-mark {
  filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=100);
  opacity: 1;
  -webkit-animation: slide-in 3s cubic-bezier(0.77, 0, 0.175, 1);
  -moz-animation: slide-in 3s cubic-bezier(0.77, 0, 0.175, 1);
  animation: slide-in 3s cubic-bezier(0.77, 0, 0.175, 1);
  -webkit-animation-fill-mode: both;
  -moz-animation-fill-mode: both;
  animation-fill-mode: both;
  display: none;
}
.dropzone .dz-preview .dz-success-mark,
.dropzone .dz-preview .dz-error-mark {
  pointer-events: none;
  filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=0);
  opacity: 0;
  z-index: 500;
  position: absolute;
  display: block;
  top: 50%;
  left: 50%;
  margin-left: -12px;
  margin-top: -12px;
}
.dropzone .dz-preview .dz-success-mark svg,
.dropzone .dz-preview .dz-error-mark svg {
  display: block;
  width: 24px;
  height: 24px;
}
.dropzone .dz-preview .dz-success-mark {
  filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=0);
  opacity: 0;
}
.dropzone .dz-preview .dz-success-mark:after {
  display: block;
  margin: 0 auto;
  content: "¥e013";
  font-family: 'UI-icons';
  font-size: 24px;
  color: white;
  line-height: 1;
  filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=90);
  opacity: 0.9;
}
.dropzone .dz-preview .dz-success-mark svg {
  display: none;
}
.dropzone .dz-preview .dz-error-mark {
  filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=0);
  opacity: 0;
}
.dropzone .dz-preview .dz-error-message {
  pointer-events: none;
  z-index: 1000;
  position: absolute;
  display: block;
  filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=100);
  opacity: 1;
  -webkit-transition: opacity, 0.3s ease;
  -moz-transition: opacity, 0.3s ease;
  -o-transition: opacity, 0.3s ease;
  transition: opacity, 0.3s ease;
  -webkit-border-radius: 2px;
  -moz-border-radius: 2px;
  -ms-border-radius: 2px;
  -o-border-radius: 2px;
  border-radius: 2px;
  font-size: 13px;
  top: 124px;
  left: -8px;
  width: 136px;
  line-height: 1.5;
  background-color: rgba(246, 90, 105, 0.95);
  padding: 8px 12px;
  color: white;
}
.dropzone .dz-preview .dz-error-message:after {
  content: '';
  position: absolute;
  top: -7px;
  left: 64px;
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-bottom: 7px solid rgba(246, 90, 105, 0.95);
}
.dropzone .dz-preview.dz-processing .dz-progress {
  filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=100);
  opacity: 1;
  -webkit-transition: all, 0.2s linear;
  -moz-transition: all, 0.2s linear;
  -o-transition: all, 0.2s linear;
  transition: all, 0.2s linear;
}
.dropzone .dz-preview.dz-complete .dz-progress {
  filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=0);
  opacity: 0;
  -webkit-transition: opacity, 0.4s ease-in;
  -moz-transition: opacity, 0.4s ease-in;
  -o-transition: opacity, 0.4s ease-in;
  transition: opacity, 0.4s ease-in;
}
.dropzone .dz-preview:not(.dz-processing) .dz-progress {
  -webkit-animation: pulse 3s ease infinite;
  -moz-animation: pulse 3s ease infinite;
  animation: pulse 3s ease infinite;
  -webkit-animation-fill-mode: both;
  -moz-animation-fill-mode: both;
  animation-fill-mode: both;
}
.dropzone .dz-preview .dz-remove {
  position: absolute;
  top: -4px;
  right: -4px;
  z-index: 30;
  width: 24px;
  height: 24px;
  -webkit-border-radius: 50%;
  -moz-border-radius: 50%;
  -ms-border-radius: 50%;
  -o-border-radius: 50%;
  border-radius: 50%;
  background-color: #f65a69;
  color: white;
  text-align: center;
  display: block;
  cursor: pointer;
  border: none;
}
.dropzone .dz-preview .dz-remove:hover {
  text-decoration: none;
}
.dropzone .dz-preview .dz-remove:after {
  font-family: 'UI-icons';
  font-size: 12px;
  content: "¥e014";
  display: block;
  color: white;
  margin-top: 2px;
}
.dropzone .dz-preview .dz-details {
  z-index: 20;
  position: absolute;
  top: 0;
  left: 0;
  filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=0);
  opacity: 0;
  font-size: 12px;
  min-width: 100%;
  max-width: 100%;
  height: 120px;
  padding: 76px 8px 8px;
  text-align: center;
  background-color: rgba(82, 100, 108, 0.3);
  line-height: 150%;
}
.dropzone .dz-preview .dz-details .dz-size {
  font-size: 12px;
}
.dropzone .dz-preview .dz-details .dz-size span {
  color: white;
}
.dropzone .dz-preview .dz-details .dz-size span strong {
  font-weight: normal;
}
.dropzone .dz-preview .dz-details .dz-filename span {
  width: 104px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: white;
  line-height: 1;
}
.dropzone .dz-preview .dz-image {
  -webkit-border-radius: 1px;
  -moz-border-radius: 1px;
  -ms-border-radius: 1px;
  -o-border-radius: 1px;
  border-radius: 1px;
  overflow: hidden;
  width: 120px;
  height: 120px;
  position: relative;
  display: block;
  z-index: 10;
}
.dropzone .dz-preview .dz-image img {
  display: block;
}
.dropzone .dz-preview .dz-progress {
  filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=100);
  opacity: 1;
  z-index: 1000;
  pointer-events: none;
  position: absolute;
  height: 4px;
  left: 50%;
  top: 50%;
  margin-top: -8px;
  width: 96px;
  margin-left: -48px;
  background: rgba(219, 224, 227, 0.9);
  -webkit-transform: scale(1, 1);
  -moz-transform: scale(1, 1);
  -ms-transform: scale(1, 1);
  -o-transform: scale(1, 1);
  transform: scale(1, 1);
  -webkit-border-radius: 8px;
  -moz-border-radius: 8px;
  -ms-border-radius: 8px;
  -o-border-radius: 8px;
  border-radius: 8px;
  overflow: hidden;
}
.dropzone .dz-preview .dz-progress .dz-upload {
  background: #02a4f5;
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 0;
  -webkit-transition: width, 300ms ease-in-out;
  -moz-transition: width, 300ms ease-in-out;
  -o-transition: width, 300ms ease-in-out;
  transition: width, 300ms ease-in-out;
}