Question

Im trying to append some JSON data from the last.fm API,

I have been using alert() at several stages to verify the API is being parsed correctly and it is,

This has led me to the conclusion that getElementById().appendChild() doesn’t work, below is the URL to the test page I have set up:

http://mutant-tractor.com/tabtest.html

Code here

 
function calculateDateAgo(secAgo) {
 var agoString, agoRange, agoScaled;
 if(secAgo >= (agoRange = 60*60*24)) 
   agoString = (agoScaled = Math.floor(secAgo/agoRange))+" "+(agoScaled>1?"days":"day") + " ago"
 else if(secAgo >= (agoRange = 60*60))
   agoString = (agoScaled = Math.floor(secAgo/agoRange))+" "+(agoScaled>1?"hours":"hour") + " ago"
 else if(secAgo >= (agoRange = 60))
   agoString = (agoScaled = Math.floor(secAgo/agoRange))+" "+(agoScaled>1?"minutes":"minute") + " ago"
 else if(secAgo >= -60)
   agoString = "blastin' out now";
 else
   agoString = "soon ;)";
 return agoString
}

function truncateName(name, l) {
return name.length > l ? name.substr(0,l-2) + "\u2026" : name
}

function lfmRecentTracks(JSONdata) {

try { 
 var eImg, eLink, eSpan, divTag, eWrapper;
 var oTracks = new Array().concat(JSONdata.recenttracks.track);
 for (var i = 0; i [lessthanhere] oTracks.length; i++) {
  //insert track link
  spanTag = document.createElement("span");
  spanTag.className = "lfmTrackInfoCell tabslider";
  eLink = document.createElement("a");
  eLink.appendChild(document.createTextNode( truncateName(oTracks[i].name, 25) ));
  //alert(truncateName(oTracks[i].name, 25));
  spanTag.appendChild(eLink);
  eLink.href = oTracks[i].url;
  //alert(oTracks[i].url);
  eLink.target = "new";
  eLink.className = "lfmTrackTitle";
  document.body.appendChild(spanTag);

  //insert artist name
  eSpan = document.createElement("span");
  eSpan.appendChild(document.createTextNode(truncateName(oTracks[i].artist["#text"], 22) ));
  //alert(truncateName(oTracks[i].artist["#text"], 22));
  eSpan.className = "lfmTrackArtist";
  document.body.appendChild(eSpan);

  //insert date
  eSpan = document.createElement("span");
  spanTag.appendChild(eSpan);
  eSpan.appendChild(document.createTextNode(   (typeof oTracks[i].date=="undefined"?"now playing":calculateDateAgo(new Date().getTime()/1000 - oTracks[i].date.uts))  )); 
  //alert((typeof oTracks[i].date=="undefined"?"now playing":calculateDateAgo(new Date().getTime()/1000 - oTracks[i].date.uts))); 
  eSpan.className = "lfmTrackDate"; 
  document.body.appendChild(eSpan);
 }  
} catch(e) {}
}

The only way it works is by using document.body.appendChild()

I’m calling the script in the head if that makes a difference?

The div I’m trying to attach them to are 4 different divs i.e. in the for loop each loop needs to reference a different element,

Thanks in advance!
Myles

Answer 1

I’m calling the script in the head if that makes a difference?

You won’t be able to getElementById() if the document body hasn’t even been parsed. In other words, you need to run your code in an window.onload function, or place it at the very bottom of your body.

Also, remove the try/catch while testing, it will only hide errors.