August 2011
Intermediate to advanced
546 pages
20h 53m
English
Content preview from Programming Social Applications
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Link
The Link element allows a developer to take advantage of application
life-cycle events defined by a container. Such events might be
application installs or uninstalls, or any other event in the day-to-day
life of a social application. The container supports these features by
sending relevant query parameters denoting the event to a URL endpoint specified within the Link node.
A Link node may take the
following form under the ModulePrefs
element:
<ModulePrefs>
<Link rel="event" href="http://www.mysite.com/ping.php" method="POST" />
<Link rel="event.addapp" href="http://www.mysite.com/add_app.php" />
<Link rel="event.removeapp" href="http://www.mysite.com/remove_app.php" />
</ModulePrefs>As you can see in the preceding example, the Link node has several associated attributes.
They are listed in Table 3-5.
Table 3-5. Link attributes
Attribute | Description |
|---|---|
| The string value that denotes the event being triggered. This value is required. |
| The URL to make a request to once the event has been triggered. This value is required. |
| The HTTP request method, either |
If a Link node is specified
with a rel of
opensocialevent (e.g., rel="event"), then any undefined life-cycle
event types will be sent through to that href value by default. If there are one or more Link nodes with a rel of
opensocialevent.type (e.g., rel="event.addapp"), then any ...
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