Tracking the number of slides on LMS

Here's a quick example of what the JS trigger might look like.

var player=GetPlayer();

//grab the array so we can update it
var masteryArray=player.GetVar("masteryArray").split(",");

//grab the current slide number
var cIndex=player.GetVar("cSlide");

//set the array index of the current slide number to 1
masteryArray[Number(cIndex)]=1;

//push it back into storyline. Need to retain it so we can update it
var collapsedArray=masteryArray.toString();
player.SetVar("masteryArray",collapsedArray);

//calculate the sum of the array
for (var i = 0, sum = 0; i < masteryArray.length; sum += Number(masteryArray[i++]));

//grab the total number of slides and calculate the percentage complete
var tSlides=player.GetVar("tSlides");
var totalComplete=Math.round(sum/Number(tSlides)*100);

//submit to the LMS
var lmsAPI = parent;
lmsAPI.SetScore(totalComplete, 100, 0);