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JS: Parse RSS Feed

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Simple Javascript that will get a feed and parse it using Ajax

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  1. function SendAjax(url, callbackFunction) {
  2.    if (window.XMLHttpRequest) {
  3.       var request = new XMLHttpRequest();
  4.    } else {
  5.       var request = new ActiveXObject("Microsoft.XMLHTTP");
  6.    }
  7.  
  8.    request.open("POST", url, true);
  9.    request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); 
  10.  
  11.    request.onreadystatechange = function() {
  12.       if (request.readyState == 4 && request.status == 200) {
  13.          if (request.responseText) {
  14.             ReceiveAjax(request.responseText, callbackFunction);
  15.          }
  16.       }
  17.    }
  18.  
  19.    request.send(null);
  20. }
  21.  
  22. function ReceiveAjax(response, callbackFunction) {
  23.    if (window.ActiveXObject) {
  24.       var doc = new ActiveXObject("Microsoft.XMLDOM");
  25.       doc.async = "false";
  26.       doc.loadXML(response);
  27.    } else {
  28.       var parser = new DOMParser();
  29.       var doc = parser.parseFromString(response,"text/xml");
  30.    }
  31.  
  32.    callbackFunction(doc.documentElement);
  33. }
  34.  
  35. function ValueFromTagName(item, tagname) {
  36.    var val = item.getElementsByTagName(tagname);
  37.    return val[0].firstChild.nodeValue;
  38. }
  39.  
  40. function ParseData(data) {
  41.    var items = data.getElementsByTagName('item');
  42.    var output = '<ul>';
  43.  
  44.    for (var i = 0; i < items.length; ++i) {
  45.       var title = ValueFromTagName(items[i], 'title');
  46.       var link = ValueFromTagName(items[i], 'link');
  47.  
  48.       output += '<li><strong><a href ="' + link + '">' + title + '</strong> ' + '</li>';
  49.    }
  50.  
  51.    output += '</ul>';
  52.  
  53.    var RSSOutput = document.getElementById('RSSOutput');
  54.    	   RSSOutput.innerHTML = output;
  55. }
  56.  
  57. function LoadFeed( url ) {
  58.    var GetFeed = url;
  59.    SendAjax('getfeed.php?url=' + escape(GetFeed.value), ParseData);
  60. }
  61. LoadFeed( "http://del.icio.us/rss/twelvetone" );

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