1 // ////////////////////////////////////////////////////////////////////////////

     2 // Symbian Foundation Example Code

     3 //

     4 // This software is in the public domain. No copyright is claimed, and you 

     5 // may use it for any purpose without license from the Symbian Foundation.

     6 // No warranty for any purpose is expressed or implied by the authors or

     7 // the Symbian Foundation. 

     8 // ////////////////////////////////////////////////////////////////////////////

     9 

    10 

    11 var twitterurl = "http://twitter.com/statuses/user_timeline/21138778.rss";

    12 

    13 function Twitter(parentView) {

    14 	this.parentView = parentView;

    15 	this.buttons = null;	

    16 	this.numToShow = 5;

    17 	this.http = null;

    18 }

    19 

    20 Twitter.prototype.Update = function(numToShow){

    21 	this.numToShow = numToShow;

    22 	if ( this.buttons == null ) {

    23 		// add the separator

    24 		var separator = new NavigationButton(null, "tweetz-icon.png", "<img src='tweetz.png' border=0>");

    25 		separator.setEnabled(false);

    26 		this.parentView.addControl(separator);

    27 		// create buttons

    28 		this.buttons = new Array();

    29 		for( var i = 0 ; i < this.numToShow; i++ ) {

    30 			var button = new NavigationButton("twitter_button_"+i, null , "");

    31 			this.parentView.addControl(button);

    32 			this.buttons.push(button);

    33 		}

    34 		this.buttons[0].setText("Loading twitter feed...");

    35 	}

    36 	var self = this;

    37 	// get the rss 

    38 	// Prepare synchronous download

    39 	this.http = new Ajax();

    40     this.http.open("GET", twitterurl , true); // false means synchronous

    41     this.http.onreadystatechange = function() { self.DoUpdate(); };

    42     this.http.send(null);

    43 }

    44 

    45 Twitter.prototype.DoUpdate = function(){

    46     if (this.http.readyState == 4) {

    47 	

    48 		try {

    49 			// Get parsed Doc

    50 			var xmlDoc = this.http.responseXML;

    51 			if (xmlDoc == null) {

    52 				// if the content type is not set correctly, we get the response as text

    53 				var xmlparser = new DOMParser();

    54 				xmlDoc = xmlparser.parseFromString(this.http.responseText, "text/xml");

    55 			}

    56 			var itemElements = xmlDoc.getElementsByTagName("item");

    57 			var loopEnd = Math.min(this.numToShow, itemElements.length);

    58 			// traverse elements and create buttons

    59 			for (var i = 0; i < loopEnd; i++) {

    60 				// iterate through child nodes of this item and gather tweets

    61 				var title = null;

    62 				var date = null;

    63 				

    64 				node = itemElements[i].firstChild;

    65 				while (node != null) {

    66 					if (node.nodeType == Node.ELEMENT_NODE) {

    67 						if (node.nodeName == "title") {

    68 							// item title

    69 							title = getTextOfNode(node);

    70 						}

    71 						else 

    72 							if (node.nodeName == "pubDate" || node.nodeName == "dc:date") {

    73 								// item publishing date

    74 								date = getTextOfNode(node);

    75 							}

    76 					}

    77 					node = node.nextSibling;

    78 				}

    79 				

    80 				this.buttons[i].setText("<font size=0.6em><i>" + date + "</i> " + title + "</font>");

    81 				this.buttons[i].setImage("tweet.png");

    82 			}

    83 		} 

    84 		catch (x) {

    85 			this.buttons[0].setText("<font size=0.6em>Uh-Oh! Tweetz not tweeting right now.</font>");

    86 			for (var i = 0; i < this.numToShow; i++) {

    87 				this.buttons[i].setText("");

    88 				this.buttons[i].setImage(null);

    89 			}

    90 		}

    91 	}

    92 }

    93 

    94 // Returns the text of a node.

    95 function getTextOfNode(node) {

    96     var buf = "";

    97 	// iterate through all child elements and collect all text to the buffer

    98 	var child = node.firstChild;

    99 	while (child != null) {

   100 		if (child.nodeType == Node.TEXT_NODE || child.nodeType == Node.CDATA_SECTION_NODE) {

   101 			// append text to buffer

   102 			if (buf != "") {

   103 				buf += " ";

   104 			}

   105 			buf += child.nodeValue;

   106 		}

   107 		child = child.nextSibling;

   108 	}

   109 	// make link if there is a url

   110 	var ind = buf.indexOf("http://");

   111 	var endind = buf.indexOf(" ", ind);

   112 	if ( ind != -1 ) {

   113 		var tmp = buf.substring(0,ind);

   114 		var url = "";

   115 		if ( endind == -1 ) {

   116 			url = buf.substring(ind);

   117 		} else {

   118 			url = buf.substring(ind, endind);

   119 		}

   120 		tmp += "<div class=\"FeedItemLink\">";

   121         tmp += "<a href=\"JavaScript:void(0)\" onclick=\"openURL('" + url + "'); return false;\">";

   122 		tmp += url + "</a></div>";

   123 			

   124 		if ( endind != -1 ) {

   125 			tmp += buf.substring(endind);

   126 		}

   127 		buf = tmp;

   128 	}

   129 	return buf;

   130 }