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Figure 8-25. The jigsaw is nearly complete. Keeping with the jigsaw analogy, isn t it annoying when you get to the end of putting the puzzle together only to find there s a piece missing We have a similar predicament here there is no element for us to attach the final piece to, so we have to create an element simply for the purpose of hanging the background image on. It needs to be in between the outer container div and the unordered list. Here s the markup with the new div added in: <div id="related"> <h2>Related Links</h2> <div> <ul> <li><a href="/related/">Related link</a></li> <li><a href="/related/">Another link</a></li> <li><a href="/related/">And another</a></li> <li><a href="/related/">Related link</a></li> <li><a href="/related/">Another link</a></li> <li><a href="/related/">And another</a></li> </ul> </div> </div> The CSS to attach the final piece to the bottom-right edge follows. Figure 8-26 shows the end result at various different font sizes to demonstrate the scaling ability. #related div { background-: url(example2/right.gif }

There s another very important difference between and , because they re not always called as a pair. Because is triggered at the beginning of the process, you can reliably assume that it will always be called every time a is initiated. However, only happens at the end, so if anything goes wrong during the save itself, won t get triggered. This is an important distinction, because it may seem convenient to register a pair of listeners for the model saving signals, expecting that both will always be called every time. While that may be true for the majority of cases, and certainly when nothing goes wrong, things do go wrong sometimes. Examples include an entry with a duplicate primary key or other unique column, data being of the wrong type or a timeout connecting to the database. In situations where this type of behavior is required, the only reasonably sane way to go about it is to override the method on the model. This allows custom code to be run before and after the actual database interaction, but it also provides a way to identify problems that occurred in the process. In addition, it allows the code a better opportunity to pair the two pieces of functionality more fully, since if something does go wrong, it s easier to identify, and thus any pending actions can be canceled as a result.

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To use the validDate() function, you ll need to include the new JavaScript file before init.js, so that the function is available to be called. Do this by opening footer.inc.php in the common folder and inserting the following bold code: <script type="text/javascript" src="http://www.google.com/jsapi"></script> <script type="text/javascript"> google.load("jquery", "1"); </script> <script type="text/javascript" src="assets/js/valid-date.js"></script> <script type="text/javascript" src="assets/js/init.js"></script> </body> </html>

right bottom;

Similar to the previous section in spirit, and are the pair of signals relating to the deletion of model instances. They function almost identically to their saving counterparts, except that they both provide just the and arguments. When using , keep in mind that the instance passed in to the listener will have already been removed from the database, so many of its methods will raise exceptions if used. This is especially true if it had previously related to instances of other models. Those relationships will have been lost by the time is triggered, so any handling of those situations should be done in or by overriding the method on the model. Also, because the instance will have been deleted, its primary key value will no longer match up with anything in the database. However, in order to more accurately keep track of which object was deleted, the primary key value is left intact on the instance, and can be read using the shortcut described earlier in this chapter.

Figure 8-26. Scaling the box up does not break the rounded-corner effect. The addition of a seemingly superfluous div to finish the technique is not ideal, but with a bit of planning you may not need to do this in our example, it would be possible to apply a class to the last list item and add the background image there.

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