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Creating an App Activity
Now that we have the login and logout working, let’s finish the app and give the user a way to state that they want the listed car (see Figure 5).
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To create the WantActivity, we should markup the wanted item with microdata. HTML5 Microdata is a means to semantically specify structured objects in a web page. The Google API uses the items tagged with microdata to retrieve information about the item like the image, name, or description.
<a name="RedMini"></a>
<div itemscope itemtype="http://schema.org/Product" class="row">
<img itemprop="image" class="offset3 span5" src="images/car/red-mini.jpg"/>
</div>
<div class="row offset4">
<span itemprop="name">Red Mini</span>-<span
itemprop="description">2010(?) Mini Cooper</span>
</div>
To create the WantActivity, we again create a client API request, this time passing along a JSON object specifying the type of activity and the required attributes for that type. We can see that in the following function:
function makeWantActivity() { // Address must be publicly accessible var root =
‘http://0.0.0.0:5050/index.html’ var body =
{ ‘type’:‘http://schemas.google.com/WantActivity’, ‘target’:
{ ‘url’:root+‘#RedMini’ }, }; var request = gapi.client.request
({ path:‘/plus/v1/people/me/moments/vault’, method:‘POST’, debug:
true, body:body });
var callback = function (result) {
console.log(result);
alert("WantActivity posted to your Google+ profile.")
};
request.execute(callback);
}
The activity will now show on our profile page with the privacy level we set when logging in. It could be viewable to just you, all of your circles, or a subset of them (see Figure 6).
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From this area, we can also share the activity to the Google+ stream (see Figure 7).
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