Tracking Link Clicks

Steps used to facilitate the collection of Link Clicks through the use of the Reference Page Tag.

Through the deployment of the Reference Page Tag, it is possible to collect measurement data denoting the links (or href values) that visitors click while visiting particular pages. Typically, this collection does not involve the implementation of additional link identifiers into your HTML pages.

To facilitate collection of Link Clicks through the use of the Reference Page Tag, complete the following steps:

1. Copy the following code into the existing file named zig.js:

   //REFERENCE LINK AND FORM CLICK PAGE TAG
   //INITIATE FUNCTIONS ONLOAD
   function addEvent(obj, evType, fn){
    if (obj.addEventListener){
      obj.addEventListener(evType, fn, false);
      return true;
    } else if (obj.attachEvent){
      var r = obj.attachEvent("on"+evType, fn);
      return r;
    } else {
      return false;
    }
   }
   addEvent(window, 'load', startCapture);
   addEvent(window, 'load', startCapture);
   function startCapture(){
   //TO CAPTURE LINK CLICKS
     if (vlc == "1"){captureLink();}
     //TO CAPTURE FORM FIELD CLICKS
     if (vfc == "1"){captureForm();}
   }
   //BEGIN LINK CAPTURE PAGE TAG
   function captureLink(){
     if (document.links[0]){
       if (document.links){
         var links = document.links, link, k=0;
         while(link=links[k++]) {
           link.onclick = captureLinkName;
    }
       }
     }
   }
   function captureLinkName() {
     var lc=new Image();
     this.parent = this.parentNode;
     lc.src='zag2.gif?linkname=' + escape(this.name) + "&cd=" + new Date().getTime();
   }
   //END LINK CAPTURE PAGE TAG
   //BEGIN FORM CLICK CAPTURE PAGE TAG
   function captureForm(){
     if (document.forms[0]) {
       if(document.forms){
    for(i=0; i<document.forms[0].elements.length; i++){
           var forms = document.forms[0].elements[i];
           forms.onfocus = captureFormName;
         }
       }
     }
   }
   function captureFormName() {
     var fc=new Image();
     fc.src='zag3.gif?fieldname=' + escape(this.name) + "&cd=" + new Date().getTime();
   }
   //END FORM CLICK CAPTURE PAGE TAG
   

2. Create or place the 1 pixel by 1 pixel image file named zag2.gif into a directory present on your web server.

3. Modify the lc.src variable to reference the appropriate domain of your website from which the zag2.giffile is referenced.

4. Ensure appropriate cache-control headers are established for the zag.gif and zig.js files.

5. Within the HTML files you desire to collect link click values from, the Reference Page Tag Execution Call must be modified to inform the Page Tag Execution Script to capture link clicks for that page. To do so, change the vlc variable value to “1” as highlighted in the following code example:

<!-- BEGIN REFERENCE PAGE TAG-->
<script language="javascript">
var vlc = "1" //Capture Link Click  1=TRUE, 0=FALSE
var vfc = "0"; //Capture Form Field Click  1=TRUE, 0=FALSE
var v = {};
</script>

<script language="javascript" src=”https://www.myserver.com/path/to/zig.js" type="text/javascript"></script>

<noscript>
<img src="/path/to/zag.gif?Log=1&v_jd=1" border="0" width="1" height="1"/>
</noscript>

<!-- END REFERENCE PAGE TAG-->