Tạo mạng xã hội với PHP - part 32 doc

Calendar of eventsWe looked earlier at integrating the calendar library with birthdays, so why not try and integrate the events with the calendar too?. Viewing an event To view an event

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Template for a new event

Our "Create event" template simply needs fields for the name, date, start time, end

time, description, and checkboxes for all of the user's friends We can give the date

field a class of selectdate, to make use of the jQuery datepicker plug-in we used

for profiles We may also wish to use the time picker plug-in too, to make time

selection easier The friends loop is highlighted in the following code:

</div>

<h1>Create an event</h1>

<label for="">Type of event</label><br />

<option value="public">Public event</option>

<option value="private">Private event</option>

</select><br />

<input type="text" class="selectdate" name="date"

/><br />

<label for="">Start time</label><br />

<input type="text" class="selecttime" name="start_

time" /><br />

<input type="text" class="selecttime" name="end_

time" /><br />

<label for="">Description</label><br />

</ textarea><br />

<h2>Invite friends?</h2>

<p>Select any friends you would like to invite to

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</form>

</div>

Now, if we visit the create event page (event/create), we see the form:

This makes use of the very helpful datepicker plugin:

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Calendar of events

We looked earlier at integrating the calendar library with birthdays, so why not try

and integrate the events with the calendar too? The code is in the download bundle

for this book if you need help.

Viewing an event

To view an event, we simply call the toTags method on the model, and build the

template We should also list users who have been invited, are attending, are not

attending, and who are maybe attending:

/**

* View an event

* @param int $id

* @return void

*/

private function viewEvent( $id )

{

require_once( FRAMEWORK_PATH 'models/event.php' );

$event = new Event( $this->registry, $id );

$show = true;

if( $event->getType() == 'private' )

{

// you may wish to add to support for private events here!

$show = false;

}

if( $show == true )

{

$event->toTags( 'event_' );

$this->registry->getObject('template')->buildFromTemplates(

'header.tpl.php', 'events/view.tpl.php', 'footer.tpl.php' );

$attendingCache = $event->getAttending();

$this->registry->getObject('template')->getPage()->addTag(

'attending', array('SQL', $attendingCache) );

$notAttendingCache = $event->getNotAttending();

'notattending', array('SQL', $notAttendingCache) );

$maybeAttendingCache = $event->getMaybeAttending();

'maybeattending', array('SQL', $maybeAttendingCache) );

$invitedCache = $event->getInvited();

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$sql = "SELECT * FROM event_attendees WHERE event_id={$id}

AND user_id=" $this->registry->getObject('authenticate')-

>getUser()->getUserId();

$this->registry->getObject('db')->executeQuery( $sql );

if( $this->registry->getObject('db')->numRows() == 1 )

{

$data = $this->registry->getObject('db')->getRows();

if( $data['status'] == 'going' )

{

$s = 'attending';

}

elseif( $data['status'] == 'not going' )

{

$s = 'notattending';

}

elseif( $data['status'] == 'maybe' )

{

$s = 'maybeattending';

}

else

{

$s = 'unknown';

}

$this->registry->getObject('template')->getPage()-

>addTag( $s '_select', "selected='selected'");

}

else

{

>addTag('unknown_select', "selected='selected'");

}

else

{

// error handling

}

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Event template

The template for viewing the event contains tags for the event, and template loops

for the different types of attendee status:

</div>

<h1>{event_name}</h1>

<p>{event_description}</p>

<p>{event_date}: {event_start_time} until

{event_end_time}</p>

<h2>Your attendance</h2>

<p>You are currently recorded as:</p>

<form action="event/change-attendance/{event_id}"

method="post">

<option value="" {unknown_select}>Unknown -

Please select </option>

<option value="going" {attending_

select}>Attending</option>

<option value="not going" {notattending_

select}>Not attending</option>

<option value="maybe" {maybeattending_

select}>Maybe attending</option>

</select>

<input type="submit" name="" value="Update

attendance" />

</form>

<h2>Attending</h2>

<ul>

<! START attending ><li>{name}</li>

<! END attending >

</ul>

<h2>Invited / Awaiting Reply</h2>

<ul>

<! START invited ><li>{name}</li>

<! END invited >

</ul>

<h2>Maybe attending</h2>

<ul>

<! START maybeattending ><li>{name}</li>

<! END maybeattending >

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<! END notattending >

</ul>

</div>

Viewing an event in action

If we now view an event (event/view/1), we are presented with the view

event screen:

Upcoming events

Thanks to the listUpcomingInNetwork method in our events model, we can easily

build a list of events in our user's network:

private function listUpcomingInNetwork()

{

require_once( FRAMEWORK_PATH 'models/events.php' );

$events = new Events( $this->registry );

$cache = $events->listEventsFuture( $this->registry-

>getObject('authenticate')->getUser()->getID(), 30 );

>addTag( 'events', array( 'SQL', $cache ) );

$this->registry->getObject('template')->buildFromTemplates(

'header.tpl.php', 'events/upcoming.tpl.php',

'footer.tpl.php' );

}

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We may wish to remind users about specific events, either events created by their

contacts, or events that they have indicated they wish to attend We can easily

remind them of the event either through:

• Notices on the site reminding them

• E-mails reminding them

• Text/SMS messages

Off-site reminders would need to work via a task-based system, for example a

CRON job that is run each night, which looks up events a user is attending or may

be attending X days in the future (those queries in the events model are looking

extra handy now!) and sends them a reminder.

On-site notifications

On-site reminders would simply call the appropriate method in the events model, to

see whether there are any events the user may be attending within the next X days,

and if there are, list them on the screen.

E-mail notifications

We have an e-mail sending object in our registry; we can use this to e-mail out

reminders to our users.

SMS notifications

For us to send SMS notifications, we need to use a mobile gateway, such as:

• Clickatell: Large international SMS/mobile gateway - http://www

clickatell.com/

• Intellisoftware: UK based SMS gateway—http://www.intellisoftware

co.uk/

Such gateways provide simple APIs where a text message can be sent via a simple

HTTP request containing API credentials, sender number, recipient number, and the

message We can create a library to talk to the API, and use this to send messages to

our users.

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Packt have published a book called Mobile Web Development by Nirav Mehta

(https://www.packtpub.com/mobile-web-development/book), which includes

lots of great examples of clickatell, and well worth a read if you are considering

implementing SMS integration The Clickatell website and Intellisoftware websites

both have in-depth information on working with their APIs too.

Summary

In this chapter, we have looked at developing a flexible calendar library to integrate

calendar functionality into various aspects of our site We created a calendar

controller to display birthdays of our users' connections, along with their ages.

We then moved on to events, creating models and controllers for creating events,

viewing events, listing events, and inviting connections to the events With our

calendar library, we are now able to integrate these events into the calendar.

Following from events, we looked at inviting contacts to events, and how they can

update us on their intention to attend the event, and with a little extra development,

we can integrate reminders too.

Now, we can move onto the final core feature of any social network—groups!

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We only have one user-facing feature left to implement for our Dino Space website,

and that is groups within the social network Most social networking websites have

the ability for users to form their own sub-groups, a small sub-set of users discussing

or sharing information about specific things Within our site, this could be to allow

groups of users to privately discuss matters, or for users who share common interests

to discuss things without cluttering up everyone else's network with information

that may not interest them.

In this chapter you will learn:

• How to create a group area

• How to allow users to create groups

• How users can be invited to join these groups

• How to deal with the "ownership" of a particular group

Let's get started and add groups to our social network!

Some planning

Before we can start implementing this feature, we need to think about what

information it needs to manage, how it will work, and what it will offer to our users.

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