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Within the administration system, you can view all of your installed themes within the Themes tab (see Figure 9-15). Typo comes with two preinstalled themes: Azure, which is the default theme that we just saw, and Scribbish, a stylish yet clean template that formats the blog posts using the microformat specification. You can instantly switch between any installed themes by simply clicking the Activate link on the themes page.

Aha! Progress. As a developer, you might expect a drop to correspond with a movement in the DOM. The act of dragging an li over a ul feels like it ought to detach that li from its current parent and attach it to the new ul. But Firebug s HTML tab, pictured in Figure 11-4, shows that the target ul is still empty.

def upload if request.post count = 0 training_class = TrainingClass.find_by_id(params[:training_class_id]) training_class_date = Date.parse(params[:training_class_date])

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Themes are installed into the /themes directory with each theme self-contained in its own subdirectory there. Navigating into each theme subdirectory, you can see that they follow a common pattern of using the same folder and file names within each. We have familiarsounding folders named things like images, stylesheets, views, and layouts. The reason for this is that Typo will first check in these folders for the active theme when rendering a page to the end user. If Typo finds a file it needs here, it will use it; if not, it will search in the normal Rails paths. This dynamic search is extremely powerful, as it allows us to easily add a new theme by uncompressing it into this /themes directory without worrying about adding all the supporting style sheets, images, and so on into our public directories.

Figure 11-4. Firebug confirms that the drag-and-drop action did not change the draggable s position in the document.

request, which means that the user has submitted the form. After that, it sets a few variables. It finds the appropriate TrainingClass, which the user has selected using a drop-down list, and then parses the user-entered date. These variables will be used to assign a date and a TrainingClass to each grade entered on the form. Next, you loop through the params[:trainee] array, which has one entry for each row of your form, and add a grade object for each of them:

We can use our onDrop callback to append the draggable to the droppable. It takes three arguments: the draggable element, the droppable element, and the mouseup event linked to the drop.

params[:trainee].each do |index, t| next if t[:name]==''

Tip A good place to go to look for new themes for Typo is the Typo theme viewer at http:// www.dev411.com/typo/themes/, which provides thumbnails of all the themes that were submitted to the Typo theme contest (http://www.typogarden.org/). New themes are typically installed by simply uncompressing the file into the /themes directory.

Let s start by writing a general function that will get called for drops. We can use appendChild, the built-in DOM method, to add the draggable as a child of the droppable.

student = Student.find_or_create_by_name_and_employer( t[:name], t[:employer]) student.grades.create(:percentage_grade => t[:grade], :training_class=>training_class, :took_class_at=>training_class_date) count = count +1 end flash[:notice]="#{count} Entries Uploaded!" end end

function appendOnDrop(draggable, droppable, event) { droppable.appendChild(draggable); }

One word of caution is that some older themes that were written for prior versions of Typo will break when you try to use them with the most recent version. A common issue in the older themes is a change in how the sidebars are rendered. If you see a call like this in the layout template: <%= render_component(:controller => 'sidebars/sidebar', :action => 'display_plugins') %> you may be able to fix the theme by changing that previous call to this instead: <%= render_sidebars %> Of course, we re not interested is using an existing theme, we want to build something unique for Alanna. Fortunately, building a custom theme within Typo is almost as easy as adding a premade one.

Note the use of find_or_create_by_name_and_employer. This dynamically generated finder returns an existing Student object with that name and employer if it already exists; if not, it creates a new one.

We don t have to detach the draggable first; appendChild works for moving elements. (We could have used Element#insert in the same way; it behaves just like appendChild if it s passed a single element.) Now we should use this function as the onDrop callback for the droppable. With these changes, your script block should look like this:

s Note Using the dynamically generated finder means that a typo in the name or employer field will create

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