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This page was last modified 12:06, 8 November 2007.

Como usar feeds RSS em Widgets WRT

From Forum Nokia Wiki


Compatibilidade: Web Run-Time na S60 3rd Edition, Feature Pack 2


Contents

Código de exemplo

Este exemplo contém código JavaScript para fazer a leitura de feeds RSS. O parsing de feeds RSS é feito utilizando-se JavaScript padrão - entretanto desenvolvedores devem introduzir manipuladores de condições de erro para os casos em que o aparelho estiver fora da rede, sem SIM card, etc. ou a ação tenha sido cancelada pelo usuário.

Requisição

function loadRSSFeed(url) {
  if (null == req) {
    req = new XMLHttpRequest();
  }  	
  
  req.onreadystatechange = ReqStateChange;
    
  req.open("GET", url, true);
  req.send(null); 
 
  document.getElementById("content").innerHTML = "Updating" + url; 
}

Callback da requisição

function ReqStateChange() {
  if (req.readyState == 4) {
 
    if (req.status == 200) {
    	UpdateContent(req);
    } 
    else {
      alert("error");
    }
  }
}

Interpretador de RSS

function UpdateContent(reqst) {
  var d = null;
  var el = document.getElementById("content");
  
  document.getElementById("content").innerHTML = "Updating!";
    
  var rss = null;
  
  var html = "";
  rss = reqst.responseXML.documentElement;
 
  if (rss != null) {
    var itemTitleNodes = rss.getElementsByTagName("title");
    var itemLinkNodes = rss.getElementsByTagName("link");
    var itemDescNodes = rss.getElementsByTagName("description");
  
    var c=itemTitleNodes.length;
 
    el.innerHTML="Displaying " + c + " items...";
	
    if (c<=0) {
      return;
    };
	
    if (c>4) c=3; // limit to four stories
    
    for (var i = 0; i < c; i++) { 
      var itemLink, itemTitle, itemDesc;
	
      if ((itemTitleNodes[i+2].childNodes[0] != null) &&
	  (itemLinkNodes[i+2].childNodes[0] != null) &&
	  (itemDescNodes[i+1].childNodes[0] != null)) {
				
        itemTitle = itemTitleNodes[i+2].childNodes[0].nodeValue;
	itemLink = itemLinkNodes[i+2].childNodes[0].nodeValue;
	itemDesc = itemDescNodes[i+1].childNodes[0].nodeValue;
      }
      else {
        itemTitle = "RSS feed missing";
	itemLink = "???";
	itemDesc = "RSS broken";
      }
      html = html + "<div class='item'><div class='linking'
      onClick='widget.openURL(\"" + itemLink +
      "\");'>"+itemTitle+"</div></br><div
      class='description'>"+itemDesc+"</div></div></br>";
    }
  }
 
  el.innerHTML = html;
  html = null;
  el = null;
  req = null;
	  
  d = document.getElementById("lastupdate");		
}
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