(refs #12) Created the helper of the attachment function.

src/main/twirl/helper/attached.scala.html

@@ -0,0 +1,22 @@
+@(owner: String, repository: String)(textarea: Html)(implicit context: app.Context)
+@import context._
+<div class="muted">
+  @textarea
+  Attach images by dragging &amp; dropping, or selecting them.
+</div>
+@defining("(id=\")([\\w\\-]*)(\")".r.findFirstMatchIn(textarea.body).map(_.group(2))){ textareaId =>
+<script>
+$(function(){
+  $('#@textareaId').closest('div').dropzone({
+    url: '@path/upload/image/@owner/@repository',
+    maxFilesize: 10,
+    previewTemplate: "<div class=\"dz-preview\">\n  <div class=\"dz-progress\"><span class=\"dz-upload\" data-dz-uploadprogress>Uploading your images...</span></div>\n  <div class=\"dz-error-message\"><span data-dz-errormessage></span></div>\n</div>",
+    success: function(file, id) {
+      var images = '\n![' + file.name.split('.')[0] + '](@path/@owner/@repository/_attached/' + id + ')';
+      $('#@textareaId').val($('#@textareaId').val() + images);
+      file.previewElement.remove();
+    }
+  });
+});
+</script>
+}