Pen Settings

HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

+ add another resource

JavaScript

Babel is required to process package imports. If you need a different preprocessor remove all packages first.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Behavior

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML

              
                <p><strong>Click to open/close the preloader.</strong><br>Completely customizable (colors, radius, number of dots, size, etc.).<br>One JavaScript call opens or closes the preloader elegantly.</p>
              
            
!

CSS

              
                /* none of this CSS is necessary for the preloader */
body {
  background-color: #ccc;
  font-family: sans-serif;
  font-size: 18px;
}
p {
  position: fixed;
  bottom: 0;
  text-align: center;
  width: 100%;
  padding: 0 10px 4px 10px;
}
              
            
!

JS

              
                //Pure JS, completely customizable preloader from GreenSock.
//Once you create an instance like var preloader = new GSPreloader(), call preloader.active(true) to open it, preloader.active(false) to close it, and preloader.active() to get the current status. Only requires TweenLite and CSSPlugin (https://www.greensock.com/gsap/)
var preloader = new GSPreloader({
  radius:42, 
  dotSize:15, 
  dotCount:10, 
  colors:["#61AC27","#555","purple","#FF6600"], //have as many or as few colors as you want.
  boxOpacity:0.2,
  boxBorder:"1px solid #AAA",
  animationOffset: 1.8, //jump 1.8 seconds into the animation for a more active part of the spinning initially (just looks a bit better in my opinion)
});

//open the preloader
preloader.active(true);

//for testing: click the window to toggle open/close the preloader
document.onclick = document.ontouchstart = function() {
  preloader.active( !preloader.active() );
};

//this is the whole preloader class/function
function GSPreloader(options) {
  options = options || {};
  var parent = options.parent || document.body,
      element = this.element = document.createElement("div"),
      radius = options.radius || 42,
      dotSize = options.dotSize || 15,
      animationOffset = options.animationOffset || 1.8, //jumps to a more active part of the animation initially (just looks cooler especially when the preloader isn't displayed for very long)
      createDot = function(rotation) {
          var dot = document.createElement("div");
        element.appendChild(dot);
        TweenLite.set(dot, {width:dotSize, height:dotSize, transformOrigin:(-radius + "px 0px"), x: radius, backgroundColor:colors[colors.length-1], borderRadius:"50%", force3D:true, position:"absolute", rotation:rotation});
        dot.className = options.dotClass || "preloader-dot";
        return dot; 
      }, 
      i = options.dotCount || 10,
      rotationIncrement = 360 / i,
      colors = options.colors || ["#61AC27","black"],
      animation = new TimelineLite({paused:true}),
      dots = [],
      isActive = false,
      box = document.createElement("div"),
      tl, dot, closingAnimation, j;
  colors.push(colors.shift());
  
  //setup background box
  TweenLite.set(box, {width: radius * 2 + 70, height: radius * 2 + 70, borderRadius:"14px", backgroundColor:options.boxColor || "white", border: options.boxBorder || "1px solid #AAA", position:"absolute", xPercent:-50, yPercent:-50, opacity:((options.boxOpacity != null) ? options.boxOpacity : 0.3)});
  box.className = options.boxClass || "preloader-box";
  element.appendChild(box);
  
  parent.appendChild(element);
  TweenLite.set(element, {position:"fixed", top:"45%", left:"50%", perspective:600, overflow:"visible", zIndex:2000});
  animation.from(box, 0.1, {opacity:0, scale:0.1, ease:Power1.easeOut}, animationOffset);
  while (--i > -1) {
    dot = createDot(i * rotationIncrement);
    dots.unshift(dot);
    animation.from(dot, 0.1, {scale:0.01, opacity:0, ease:Power1.easeOut, immediateRender:true}, animationOffset);
    //tuck the repeating parts of the animation into a nested TimelineMax (the intro shouldn't be repeated)
    tl = new TimelineMax({repeat:-1, repeatDelay:0.25});
    for (j = 0; j < colors.length; j++) {
      tl.to(dot, 2.5, {rotation:"-=360", ease:Power2.easeInOut}, j * 2.9)
        .to(dot, 1.2, {skewX:"+=360", backgroundColor:colors[j], ease:Power2.easeInOut}, 1.6 + 2.9 * j);
    }
    //stagger its placement into the master timeline
    animation.add(tl, i * 0.07);
  }
  if (TweenLite.render) {
    TweenLite.render(); //trigger the from() tweens' lazy-rendering (otherwise it'd take one tick to render everything in the beginning state, thus things may flash on the screen for a moment initially). There are other ways around this, but TweenLite.render() is probably the simplest in this case.
  }
  
  //call preloader.active(true) to open the preloader, preloader.active(false) to close it, or preloader.active() to get the current state.
  this.active = function(show) {
    if (!arguments.length) {
      return isActive;
    }
    if (isActive != show) {
      isActive = show;
      if (closingAnimation) {
        closingAnimation.kill(); //in case the preloader is made active/inactive/active/inactive really fast and there's still a closing animation running, kill it.
      }
      if (isActive) {
        element.style.visibility = "visible";
        TweenLite.set([element, box], {rotation:0});
        animation.play(animationOffset);
      } else {
        closingAnimation = new TimelineLite();
        if (animation.time() < animationOffset + 0.3) {
          animation.pause();
          closingAnimation.to(element, 1, {rotation:-360, ease:Power1.easeInOut}).to(box, 1, {rotation:360, ease:Power1.easeInOut}, 0);
        }
        closingAnimation.staggerTo(dots, 0.3, {scale:0.01, opacity:0, ease:Power1.easeIn, overwrite:false}, 0.05, 0).to(box, 0.4, {opacity:0, scale:0.2, ease:Power2.easeIn, overwrite:false}, 0).call(function() { animation.pause(); closingAnimation = null; }).set(element, {visibility:"hidden"});
      }
    }
    return this;
  };
}


              
            
!
999px

Console