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</script><link href="../PRODUCT_PLUGIN/book.css" rel="stylesheet" type="text/css"/><link href="css/s60/style.css" rel="stylesheet" type="text/css" media="all"/></head><body onload="initPage();"><div class="body"><div class="contentLeft prTxt"><h1 class="pageHeading" id="GUID-A3C4CDE4-4231-463D-B6A8-4969B91BDA0C">STEW: presenting content on screens</h1><div><p>Implement functions to display the data that you retrieve from Twitter in the STEW views.</p>
<p>The <code>UpdateScreen</code> object in the <code>UpdateScreen.js</code> file sets the <code>onSuccess</code> and <code>onError</code> callback functions to be handled by the <code>onTwitterUserResponse</code> and <code>onTwitterServiceError</code> functions. These functions are triggered when the request is completed, either successfully or with an error. The last line of the following code makes the actual request to Twitter:</p>
<pre class="codeblock">UpdateScreen.prototype.onActivated = function() {
// Add event listeners.
var self = this;
twitterService.onSuccess = function( response ) {
self.onTwitterUserResponse( response )
}
twitterService.onError = function( status ) {
self.onTwitterServiceError( status )
}
// Start the request.
twitterService.getTweetsForUser( null, 1 );
}
</pre>
<p>The <code>onTwitterUserResponse</code> function illustrates how the response is handled as a JavaScript object:</p>
<pre class="codeblock">UpdateScreen.prototype.onTwitterUserResponse = function( response ) {
// Set my latest status update.
var tweet = response[0];
this.setMyLatestStatus( tweet.text,
new Date( tweet.created_at ).toLocaleString() );
}
UpdateScreen.prototype.onTwitterServiceError = function( status ) {
alert("Error: (" + status + ")" );
}
</pre>
<p>The <code>TwitterService</code> performs the necessary conversions. For more information, see <a href="GUID-71A21D8D-78E3-4FEE-9F46-5D175DE5BC12.html#GUID-71A21D8D-78E3-4FEE-9F46-5D175DE5BC12">STEW: implementing a Twitter service</a>. The data can be accessed by calling various properties on the object retrieved, such as <code>.text</code> or <code>.created</code>. For more information about the responses and requests that you can make, see the Twitter API documentation.</p>
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