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Your next step is to modify the processForm() method so it calls the _validDate() method on both the start and end times for new entries. If the validation fails, simply return an error message. Add the following bold code to processForm() to implement the validation: < php class Calendar extends DB_Connect { private $_useDate; private $_m; private $_y; private $_daysInMonth; private $_startDay; public function __construct($dbo=NULL, $useDate=NULL) {...} public function buildCalendar() {...} public function displayEvent($id) {...}

Figure 8-24. Corner applied to the heading The next element to be treated is the unordered list (ul). We ve already taken care of the top-left corner (applying an image to the h2) and the top and right edges (applied to the #related div), and now we re going to add in another piece to this jigsaw on the left side. This image will be anchored to the bottom left of the ul element.

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9 describes the signal dispatching system bundled with Django, and how signals work in general. As will be explained, signals can be created and made available from any Python module, and can be used for any purpose. For dealing with models, several signals provided out of the box, and can be used in a number of situations. The following signals are all available at , and each sends the model class as the standard argument to the listener. In addition, many signals include a model instance as an additional argument. These and other additional arguments are detailed in the descriptions of each individual signal listed here.

public function displayForm() {...} /** * Validates the form and saves/edits the event * * @return mixed TRUE on success, an error message on failure */ public function processForm() { /* * Exit if the action isn't set properly */ if ( $_POST['action']!='event_edit' ) { return "The method processForm was accessed incorrectly"; } /* * Escape data from the form */ $title = htmlentities($_POST['event_title'], ENT_QUOTES); $desc = htmlentities($_POST['event_description'], ENT_QUOTES); $start = htmlentities($_POST['event_start'], ENT_QUOTES); $end = htmlentities($_POST['event_end'], ENT_QUOTES); /* * If the start or end dates aren't in a valid format, exit * the script with an error */ if ( !$this->_validDate($start) || !$this->_validDate($end) ) { return "Invalid date format! Use YYYY-MM-DD HH:MM:SS"; } /* * If no event ID passed, create a new event */ if ( empty($_POST['event_id']) ) { $sql = "INSERT INTO `events` (`event_title`, `event_desc`, `event_start`, `event_end`) VALUES (:title, :description, :start, :end)"; } /* * Update the event if it's being edited */ else

Note It s necessary to remove margins from the unordered list so that there is no gap between the heading and the list (otherwise, the border effect would be broken).

This signal fires when Django s metaclass has finished processing a model class, indicating that the class is completely configured and ready to be used. Since the metaclass operates as soon as Python encounters the class declaration, is fired before Python even continues processing the module that contains that declaration. One important note to consider, however, is that this fires just prior to the model being registered with . Therefore, if a listener for looks through to inspect the models that have been processed up to that point, the model that fired the signal won t yet be present. There may be some uses for inspecting the application cache at this point in the process, but without a full application cache, its value is quite limited. Unlike most of the other signals listed in this section, only sends the standard argument. Since there isn t any instance available at the point in time when the signal is fired and the attribute on the new model class contains all the information about how it was declared, the model itself is enough to obtain all the information that s available at that point in time.

{ /* * 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(); /* * Returns the ID of the event */ return $this->db->lastInsertId(); } catch ( Exception $e ) { return $e->getMessage(); } } public function confirmDelete($id) {...} private function _validDate($date) {...} private function _loadEventData($id=NULL) {...} private function _createEventObj() {...} private function _loadEventById($id) {...} private function _adminGeneralOptions() {...} private function _adminEntryOptions($id) {...}

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