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HTML

              
                 Issues
<ul>
  <li> 1. top box not correctly positioned (should be equally spaced)</li>
  <li> 2. progress() is triggering onComplete handler</li>
  <li>3. Nothing should be moving at start</li>
</ul>

<div id="container"></div>
              
            
!

CSS

              
                .symbol {
  width: 100px;
  height: 100px;
  position: absolute;
  z-index: 1;
  border: 1px solid khaki;
}

.seven {
  background-color: blue;
}

.bell {
  background-color: yellow;
}

.cherry {
  background-color: red;
}

.purplediamond {
  background-color: purple;
}

.bar {
  background-color: brown;
}

.wild {
  background-color: orange;
}

#container {
  border: 1px solid black;
  top: 100px;
  left: 140px;
  width: 200px;
  height: 500px;
  position: absolute;
  fill: none;
  overflow: visible;
}
              
            
!

JS

              
                var spinningtweens = [];
var slowingtweens = [];
var container = $("#container"),
  tl; //tweens need a container to work, it seems

var symbols = ["seven", "cherry", "bell", "purplediamond", "wild", "bar"];
var animationsstopped = 0;

var symbolheight = 100;

function CreateSlots() { //create slots in reel

  var reel = 0;
  var slot;

  for (slot = 0; slot <= 3; slot++) { //for each slot per reel  // '=' because for the 'dummy' symbol to fill in the blank spot

    var symbol = randomSymbol();
    var element = $('<div id=\"symbol0' + "_" + slot + '\"  class=\"' + symbol + ' symbol \" />'); //create new slot in HTML - graphics and size are defined in CSS

    $(element).css({
      "top": "-100px"
    }); //start just out of sight

    container.append(element); //tweens need a container to work, it seems
  }

}

function createanimations() {
  console.log("createanimations()");
  var reel = 0;
  var slot;
  var element;
  for (slot = 0; slot <= 3; slot++) { //for each slot per reel  // '=' because for the 'dummy' symbol to fill in the blank spot

    element = document.getElementById("symbol0_" + slot);

    //create animation that spins the symbol
    var tween = new TweenMax(element, 1, {
      top: (3 * symbolheight) + "px",
      ease: Linear.easeNone,
      onComplete: tweenComplete,
      paused: true,
      immediateRender: false,

    }); //create new tween
    tween.slot = slot; //save what position it is

    spinningtweens[slot] = tween; //save data in our data structure

    //create animation that slows and stops the symbol
    var tween2 = new TweenMax.to(element, 1 * (slot), {
      top: slot * symbolheight + "px",
      ease: Back.easeOut,
      immediateRender: false,
      onComplete: completestop,
      paused: true,

    });
    tween2.slot = slot; //save what position it is

    slowingtweens[slot] = tween2; //save data in our data structure
  }

  console.log("createanimations() finish");
}

function randomSymbol() {

  var rnd = Math.floor((Math.random() * symbols.length)); //randomly generate the type of slot
  return symbols[rnd]; //just return last symbol in list
}

function tweenComplete() {
  console.log("spinning tween completed.  slot:" + this.slot);
  this.restart();
}

function completestop() {
  //check that all symbols have stopped slowing
  animationsstopped++;
  console.log("slowing tween completed.  animationsstopped:" + animationsstopped + " slot:" + this.slot);

}

function resetslots() {
  var reel = 0;
  var slot;
  var progress, slowprogress;

  animationsstopped = 0; //sometimes if you spam the stop button it miscounts

  for (slot = 0; slot <= 3; slot++) { //for each slot per reel // '=' because for the 'dummy' symbol to fill in the blank spot

    progress = (slot + 1) / (3 + 1);
    slowprogress = 0;
    console.log("resetting progress of slot:" + slot + " reel:" + reel + " to:" + progress + " slowprogress:" + slowprogress);

    slowingtweens[slot].pause(); //stop it
    slowingtweens[slot].progress(slowprogress); //Why the f does setting this trigger the oncomplete handler
    spinningtweens[slot].pause(); //stop it
    spinningtweens[slot].progress(progress, true); //I have suppressEvents set to true!  Why the F is it still triggering the oncomplete event when i set it to 1??  Bug??
    console.log("progress set");

  }

}

//////////////////////////////////////////////////
// MAIN CODE START
$(document).ready(function() {
  console.log("main.js ready");

  CreateSlots(); //create the slot and each animation
  createanimations();
  resetslots();

}); //end ready
              
            
!
999px

Console