improve file type message, fix missing directory for drag-n-drop

app/site_files.rb

@@ -39,16 +39,11 @@ end
 
 def file_upload_response(error=nil)
   http_error_code = 406
+  flash[:error] = error if error
 
   if params[:from_button]
-    if error
-      @error = error
-      dashboard_init
-      halt 200, erb(:'dashboard')
-    else
     query_string = params[:dir] ? "?"+Rack::Utils.build_query(dir: params[:dir]) : ''
     redirect "/dashboard#{query_string}"
-    end
   else
     halt http_error_code, error if error
     halt 200, 'File(s) successfully uploaded.'
@@ -67,12 +62,10 @@ post '/site_files/upload' do
   params[:files].each do |file|
     file[:filename] = "#{params[:dir]}/#{file[:filename]}" if params[:dir]
     if current_site.file_size_too_large? file[:tempfile].size
-      file_upload_response "#{params[:dir]}/#{file[:filename]} is too large, upload cancelled."
+      file_upload_response "#{file[:filename]} is too large, upload cancelled."
     end
     if !current_site.okay_to_upload? file
-      file_upload_response %{#{params[:dir]}#{file[:filename]}: file type (or content in file) is only supported by supporter accounts.}
-      # TODO: Better explanation and link.
-      #<a href="/plan">supporter accounts</a>. <a href="/site_files/allowed_types">Why We Do This</a>}
+      file_upload_response %{#{file[:filename]}: file type (or content in file) is only supported by <a href="/plan">supporter accounts</a>. <a href="/site_files/allowed_types">Why We Do This</a>}
     end
   end
 

views/dashboard.erb

@@ -109,6 +109,7 @@
     <form action="/site_files/upload" class="dropzone" id="uploads">
       <div class="dz-message" style="display: none"></div>
       <input name="csrf_token" type="hidden" value="<%= csrf_token %>">
+      <input name="dir" type="hidden" value="<%= @dir %>">
       <div class="upload-Boundary <%= @file_list.length <= 5 ? 'with-instruction' : '' %>">
         <% @file_list.each do |file| %>
           <div class="file filehover">
@@ -240,7 +241,8 @@
 
       this.on("error", function(file, errorMessage) {
         hideUploadProgress()
-        alert('Failed: '+errorMessage)
+        location.href = '/dashboard<%= @dir ? "?dir=#{@dir}" : "" %>'
+        // alert('Failed: '+errorMessage)
       })
 
       this.on("totaluploadprogress", function(progress, totalBytes, totalBytesSent) {