Pro PHP and jQuery by Jason Lengstorf.pdf - Computer Science ...

C H A P T E R 5
■ ■ ■
Add Controls to Create, Edit,
and Delete Events
Now that the calendar can be viewed, you need to add controls that will allow administrators to create,
edit, and delete events.
Generating a Form to Create or Edit Events
To edit an event or add new events to the calendar, you need to use a form. You do this by adding a
method called displayForm() that generates a form for editing and creating events to the Calendar class.
This simple method accomplishes the following tasks:
1. Checks for an integer passed as the event ID.
2. Instantiates empty variables for the different fields used to describe events.
3. Loads event data if an event ID was passed.
4. Stores event data in the variables instantiated earlier if it exists.
5. Outputs a form.
■ Note By explicitly sanitizing the event ID passed in the $_POST superglobal, you ensure that the ID is safe to use
since any non-integer values will be converted to 0.