1. Activities in OpenSocial CS 195.35: Survey of Contemporary Technologies

2. Activities Actions carried out in a social application Activities are typically posted in an updates page in your container The OpenSocial API enables posting of activities and reading from a user’s activity stream (assuming the viewer is authorized to do so)

3. opensocial.Activity Class that represents an Activity object opensocial.newActivity(params) returns a new instance of Activity  params is an array that indicates activity details (title, body, etc) Methods:  getField( key ): returns a value  setField( key, value): sets field to value  Possible values for key: ‘title’, ‘body’, etc.

4. Posting an activity opensocial.requestCreateActivity(a,p,f)  a: Activity object  p: priority (‘high’ or ‘low’)  f: callback function once request has been processed (can be used to refresh container webpage)

5. Example var count = 0; function postActivity() { alert("about to post activity"); var title = 'this is activity post: ' + ++count; var params = {}; params[opensocial.Activity.Field.TITLE] = title; var activity = opensocial.newActivity(params); opensocial.requestCreateActivity(activity, 'high', function() { alert("activity posted; count="+count); }); alert("activity post request sent"); } Click on this button to post an activity:

6. Reading from an activity stream An Activity stream can be requested through a DataRequest object newFetchActivitiesRequest(idspec) creates the request item  idspec: specifies from which people to fetch activities Note: actual data will be retrieved and handled within the callback function  when processed, a Collection object is returned

7. Example function loadActivities() { var req = opensocial.newDataRequest(); var person = opensocial.newIdSpec({ "userId" : "VIEWER"}); req.add(req.newFetchActivitiesRequest(person), 'acts'); req.send(onLoadActivities); } function onLoadActivities(data) { var myActs = data.get('acts').getData(); var html = ‘ '; myActs.each(function(activity) { html += gadgets.util.unescapeString(activity.getField('title')); html += ' '; }); document.getElementById('acts').innerHTML = html; }

8. About activities The OpenSocial API supports activities so that apps may generate app messages to be posted in a container, visible to the user and the user’s friends Currently supported differently by the different containers  Authorization (e.g., friendster allows activity stream reading, orkut and igoogle do not, by default; orkut and igoogle allow posting, friendster does not)  Rendering of activity content Try out  the two sample applications out on your respective containers  version 5 of the gift giving application from the opensocial tutorial (wiki.opensocial.org)