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Once you have a signal to work with and a listener intended to work with it, connecting them is a simple call to the signal s method. In addition to one required argument, there are a few options that can be specified when registering a signal, customizing how that listener should be handled when the signal is dispatched later on. The callable that will receive the signal and its associated arguments. This is obviously required for all registrations. A specific object to watch for signals. Since every signal must include a sender, this allows a listener to respond to just that one sender. If omitted, the listener will be called for all senders that issue the given signal. A Boolean indicating whether weak references should be used, a topic described in more detail in the next section. This defaults to , using weak references by default. A unique string used to identify the listener on the given signal. Since modules can sometimes get imported more than once, it s possible for listeners to get registered twice, which will often cause problems. Supplying a unique string here will ensure that the listener only gets registered once, no matter how many times a module gets imported. If omitted, an ID will be generated based on the listener itself.

The next step is to identify what parts of the page can be removed entirely from print. In the travel site, it would be the parts shown in Figure 13-1.

/* * Update the event if it's being edited */ else { /* * Cast the event ID as an integer for security */ $id = (int) $_POST['event_id']; $sql = "UPDATE `events` SET `event_title`=:title, `event_desc`=:description, `event_start`=:start, `event_end`=:end WHERE `event_id`=$id"; } /* * Execute the create or edit query after binding the data */ try { $stmt = $this->db->prepare($sql); $stmt->bindParam(":title", $title, PDO::PARAM_STR); $stmt->bindParam(":description", $desc, PDO::PARAM_STR); $stmt->bindParam(":start", $start, PDO::PARAM_STR); $stmt->bindParam(":end", $end, PDO::PARAM_STR); $stmt->execute(); $stmt->closeCursor(); return TRUE; } catch ( Exception $e ) { return $e->getMessage(); } } private function _loadEventData($id=NULL) {...} private function _createEventObj() {...} private function _loadEventById($id) {...} } >

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While weak references are a fairly complex topic, well beyond the scope of this book,3 signals use of them can cause confusion in certain situations, so it s worth giving a basic overview of the problem and its solution. When an object is referenced using a weak reference, as done by Django s dispatcher, this reference alone will not keep the object from being garbage

Figure 13-1. Navigation areas that have little use for print If we hide these elements, we ll be left with just the page logo, the breadcrumb trail (which we suggest be left in for print as it is an orientation device as much as it is a navigation device), and the page content. It would have been easier, of course, to hide the header area as a whole, but that would also cause the site branding to disappear. Therefore, we ve suggested picking out specific elements to hide and ones that should remain in the printout. To hide these chosen elements, we can simply apply one rule as follows: #headerlinks, #headersearch, #tablinks, #navigation, #related, #footer { display:none; } With the layout aspects reset and all superfluous navigation items hidden, we end up with the results shown in Figure 13-2 (which shows a print preview in Firefox). The print preview facility is not always a perfect rendering of how it will appear on the printed page (there can be

The form to add and edit events is submitted to a file called process.inc.php, which is located in the inc folder (/public/assets/inc/process.inc.php). This file checks the submitted form data and saves or updates entries by performing the following steps: 1. 2. 3. 4. 5. 6. Enables the session. Includes the database credentials and the Calendar class. Defines constants (as occurs in the initialization file). Creates an array that stores information about each action. Verifies that the token was submitted and is correct, and that the submitted action exists in the lookup array. If so, go to Step 6. If not, go to Step 7. Creates a new instance of the Calendar class. 7. Calls the processForm() method. Sends the user back to the main view or output an error on failure.

collected. It must still have a strong reference somewhere else, or Python will automatically destroy it and free the memory it occupies. While standard references in Python are strong, the dispatcher, by default, uses weak references to maintain its list of registered listeners. This is generally preferable with signals, because it means that listener functions which belong to code no longer in use won t use up valuable time and energy by being called. However, some situations in Python would ordinarily cause an object to be destroyed, and these situations require special attention when using signals. In particular, if a listener function is defined inside another function perhaps to customize a function for a particular object the listener will be destroyed when its container function finishes executing and its scope is removed.

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