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// If creating/editing an event, checks for valid dates if ( $(this).siblings("[name=action]").val()=="event_edit" ) { if ( !$.validDate(start) || !$.validDate(end) ) { alert("Valid dates only! (YYYY-MM-DD HH:MM:SS)"); return false; } } // Sends the data to the processing file $.ajax({ type: "POST", url: processFile, data: formData, success: function(data) { // If this is a deleted event, removes // it from the markup if ( remove===true ) { fx.removeevent(); } // Fades out the modal window fx.boxout(); // If this is a new event, adds it to // the calendar if ( $("[name=event_id]").val().length==0 && remove===false ) { fx.addevent(data, formData); } }, error: function(msg) { alert(msg); } }); }); $(".edit-form a:contains(cancel)") .live("click", function(event){...}); }); After saving the preceding code, you can reload http://localhost/ and try to submit a new event with bad date values. The result is identical to the result obtained when using the original validDate() function.

Figure 9-7. Arial Black (sans serif)

It should be fairly clear how this method performs each of the requirements. The first block checks for accesses from the model class, raising an appropriate exception. The second block does three more tasks, by first checking for the presences of a cached copy, and continuing otherwise. Then, it does two more in one line, unpickling the raw data and storing it in the cache if the cache wasn t already populated. At the end, it simply returns whatever s in the cache, regardless of whether it was in the cache when the method began.

To add a chainable method to the jQuery object, you have to attach it to the fn object of jQuery. This allows you to call the method on a set of selected elements: $(".class").yourPlugin();

Figure 9-8. Verdana (sans serif)

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The only thing left to make the whole thing work is to get the descriptor on the model at the right time, so it s in place to get called when the attribute is accessed. This is precisely the intent of , where Django already provides a way for third-party code, such as this, to tie into the model creation process. Just make sure to always call the method on the parent class as well, to make sure that all the standard Django functionality is applied as well as the application s more specialized requirements.

Note The fn object of jQuery is actually just an alias for the jQuery object s prototype object. Modifying the

Figure 9-9. Trebuchet MS (sans serif)

With all of that now in place, we have a total of three import statements, two new classes and one new field that performs a very useful task. This is just one example of how this technique can be put to use, and there are as many more as there are applications using complicated Python data structures. The important thing to take away from this example is how to use descriptors to populate those complex objects only when necessary, which can be a big win in situations where they might not always be used.

prototype of an object will affect all future instances of that object, rather than just the current instance. For more information on this, check out the brief and simple explanation of the prototype object in JavaScript at http://www.javascriptkit.com/javatutors/proto.shtml.

Figure 9-10. Times New Roman (serif)

2 demonstrated how Python classes are really just objects like any other, and can be created at runtime by using the built-in constructor and passing in some details about

Figure 9-11. Georgia (serif)

how it should be defined. Since Django models are really just Python declared in a specific way, it s reasonable to expect that they could also be created at runtime using this same feature. Some care must be taken, but this can be an extremely useful technique in a variety of situations. The trick is to remember how Python processes classes, and how Django processes its models. 2 already illustrated the basic tools necessary to make this work, so it s now just a matter of applying that to the specific details of Django models. There are a few things that set models apart from other Python classes:

The plugin you ll build in this section will rely on a simple method to enlarge the event titles when a user hovers over them, and then return them to their original size when the user moves his mouse off the title. This plugin will be called dateZoom, and it will allow the user to configure the size, speed, and easing equation used for the animation.

Figure 9-12. Courier (monospace)

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