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I need to execute the prepareGallery function in order to attach the onclick events. If I simply execute the function right away, it won t work. If the JavaScript is executed before the document has finished loading, the Document Object Model will be incomplete. By the third line of the function (the test for the existence of imagegallery), things won t go according to plan. I want to execute the function only when the page has finished loading. When the page loads, an event is triggered. This event is onload and it is attached to the window object. If I attach the prepareGallery function to this event, then everything will go smoothly: window.onload = prepareGallery;

At this point, we re a third of the way through implementing n-level undo support. It is now possible to create a stack of snapshots of an object s data. It is time to move on and discuss the undo and accept operations.

When all is done, all the left and right trees will have been explored, and the final result is delivered to the (fun x -> x) continuation..

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The UndoChanges() method is the reverse of CopyState(). It takes a snapshot of data off the stack, deserializes it back into a Hashtable, and then takes each value from the Hashtable and restores it into the appropriate object field. Like CopyState(), once this method is complete, a virtual UndoChangesComplete() method is called to allow subclasses to take additional actions. This method will be overridden later in Csla.Core.BusinessBase. The hard issues of walking through the types in the object s inheritance hierarchy and finding all the fields in the object were solved in the implementation of CopyState(). The structure of UndoChanges() will therefore be virtually identical, except that it will restore field values rather than taking a snapshot. Since the overall structure of UndoChanges() is essentially the reverse of CopyState(), I won t show the entire code here. Rather, I ll focus on the key functionality.

As you can see from this example, continuation passing is a powerful control construct, though it is used only occasionally in F# programming.

That s quite straightforward, but it is also potentially a little shortsighted. Suppose I have two functions: firstFunction and secondFunction. What if I want to execute both of them when the page loads If I attach them, one after the other, to the onload event, only the last specified function will actually be executed: window.onload = firstFunction; window.onload = secondFunction; secondFunction will replace firstFunction. On the face of it, you would think that an event handler can hold only one instruction. But here s a workaround: I could create an anonymous function to hold the other two and then execute that third function when the page loads: window.onload = function() { firstFunction(); secondFunction(); } This works fine, and it s the simplest solution when you have a small number of functions. There s another solution that scales very nicely, no matter how many functions you want to execute when the page loads. It takes a few more lines to set it up initially but, once it s in place, attaching functions to window.onload is an easy task. This function is called addLoadEvent, and it was written by Simon Willison (http://simon.incutio.com/). It takes a single argument: the name of the function that you want to execute when the page loads. Here s what addLoadEvent does: It stores the existing window.onload as a variable called oldonload. If this hasn t yet had a function attached to it, addLoadEvent simply adds the new function in the usual way. If there is already a function attached, addLoadEvent adds the new function after the existing instructions.

It is possible for a business developer to accidentally trigger a call to UndoChanges() when there is no state to restore. If this condition isn t caught, it will cause a runtime error. To avoid such a scenario, the first thing the UndoChanges() method does is to get the edit level of the object by retrieving the Count property from the stack object. If the edit level is 0, then there s no state to restore, and UndoChanges() just exits without doing any work. This edit level concept will become even more important later during the implementation of BusinessListBase, and so you ll notice that the value is implemented as a property.

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