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<script type="text/javascript"> document.observe("dom:loaded", function() { function appendOnDrop(draggable, droppable, event) { droppable.appendChild(draggable); } $('container').select('li').each( function(li) { new Draggable(li); }); Droppables.add('drop_zone', { onDrop: appendOnDrop }); }); </script>

The easiest way to start building our own theme is to copy the contents of an existing theme. So for our purposes, let s go ahead and create a new folder named Alanna under /themes and copy the contents of the azure theme into it. You can also go ahead and delete all the images in the images folder, as we won t be using any of those. After you re done, you should have something similar to Figure 9-16.

a new Student record, which may be a problem. If so, you might prefer to require that users maintain separate lists of trainees and employers and select them from a drop-down list. Although that would be more awkward, it would reduce the chances of incorrect data input.

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Now reload the page. Before you try the drag again, go to Firebug s HTML tab and look at the source tree. Expand the body tag and you ll see our two uls one with children, one without. If our code works correctly, though, the first list will lose a child and the second will gain a child. We ll see these changes in the source tree a node gets highlighted for a moment when its DOM subtree is modified. Drag one of the items from the left column to the right. Whoa the element jumps to the right when we let go of the mouse. Why does this happen Firebug tells us we got it right the second ul now has a child. Expanding it in the source tree reveals that the droppable is now a child of the second ul. We need to take a closer look at this. Reload the page and expand the Firebug source tree again. Drill down to one of the draggable elements and click it in the tree (or you can click the Inspect button, and then click a draggable). The element is now highlighted in blue in the source tree, and its CSS styling is shown in the rightmost pane (see Figure 11-5).

Figure 9-16. Files for the custom theme for Alanna s blog The two files that will be used for the themes page in the administration system are the preview.png and the about.markdown. We can capture a screenshot of the final design to replace the preview.png after we re done, but for now, let s go ahead and edit about.markdown. This file contains the description that is displayed about our theme on themes page of the administration system. We ll put something basic in there for now: ### Alanna Custom theme for Alanna by Eldon Alameda If we were going for the simplest way to create a custom theme, we could continue to use the preexisting page layout and view files from our copied theme and merely replace the existing style sheet with the styles that we desire.

In the log controller, the following code displays your data as XML:

This pane shows the style cascade of the element the properties from all CSS rules that apply to the element, with more specific selectors nearer to the top. At the very top, under element.style, are the styles that have been assigned to that element directly whether through inline styles (the element s style attribute) or through JavaScript (the DOM node s style property). Firebug shows CSS changes in real time, just like DOM changes. Click and drag on the element you re inspecting, and move it around the page but don t drop it on the other ul just yet. You ll notice that the element.style rules update as you move the element. When you re done moving it, the CSS pane should look like Figure 11-6.

This controller action is pretty simple. It finds all of the grades and renders all the action without a layout, since it s XML and the layout is a builder template. Here s the view itself (Listing 12-6):

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