2021-08-04 13:12:35 -04:00
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<!DOCTYPE html>
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<html>
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<head>
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<style>
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body
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{
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margin:0;
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}
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section
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{
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position:relative;
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height: 100vh;
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box-sizing: border-box;
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}
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nav
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{
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position:fixed;
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right:50px;
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bottom:50px;
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z-index:10;
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}
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h2
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{
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width:500px;
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margin:0 auto;
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text-align:center;
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}
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h2[data-spy='true']
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{
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background:black;
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color: white;;
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}
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</style>
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</head>
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<body>
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<nav>
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<a href="#top" >Top</a>
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<a href="#order">Order</a>
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<a href="#video">Video</a>
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<a href="#about">About</a>
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<a href="#specs">Specs</a>
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<a href="#email">Sign-up</a>
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</nav>
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<section id="video">
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<h2 data-spy="0.2|0.8">Videos</h2>
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</section>
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<section id="about">
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<h2 data-spy="0.2|0.8">About</h2>
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</section>
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<section id="specs">
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<h2 data-spy="0.2|0.8">Specs</h2>
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</section>
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<script>
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var Time =
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{
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Jobs:[],
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Stamp:false,
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Queue:false,
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2021-08-04 14:38:48 -04:00
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Loop:false,
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2021-08-04 13:12:35 -04:00
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Add:function(inJob)
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{
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2021-08-04 14:38:48 -04:00
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if(Time.Loop)
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{
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console.log("cannot modify queue while processing");
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return;
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}
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2021-08-04 13:12:35 -04:00
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if(!Time.Queue)
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{
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window.requestAnimationFrame(Time.Update);
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}
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Time.Queue = true;
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Time.Jobs.push(inJob);
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},
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2021-08-04 14:38:48 -04:00
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Remove:function(inJob)
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{
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if(Time.Loop)
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{
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console.log("cannot modify queue while processing");
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return;
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}
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var index = Time.Jobs.indexOf(inJob);
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if(index > -1)
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{
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Time.Jobs.splice(index, 1);
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}
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},
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2021-08-04 13:12:35 -04:00
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Update:function(inTimestamp)
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{
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var delta;
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var i;
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if(!Time.Stamp)
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{
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Time.Stamp = inTimestamp;
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}
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delta = inTimestamp - Time.Stamp;
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Time.Stamp = inTimestamp;
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2021-08-04 14:38:48 -04:00
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Time.Loop = true;
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2021-08-04 13:12:35 -04:00
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for(i=0; i<Time.Jobs.length; i++)
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{
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if(Time.Jobs[i](delta) === false)
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2021-08-04 13:12:35 -04:00
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{
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Time.Jobs.splice(i, 1);
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i--;
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}
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}
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2021-08-04 14:38:48 -04:00
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Time.Loop = false;
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2021-08-04 13:12:35 -04:00
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if(Time.Jobs.length > 0)
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{
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window.requestAnimationFrame(Time.Update);
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}
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else
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{
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Time.Stamp = false;
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Time.Queue = false;
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}
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}
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};
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2021-08-04 14:38:48 -04:00
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function JobDuration(inDuration, inHandler, inDone)
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{
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var timeCurrent = 0;
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var timeLimit = inDuration*1000;
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var timeRelative = 0;
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var timeMaxed = false;
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return function(inDelta)
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{
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timeCurrent += inDelta;
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timeMaxed = timeCurrent > timeLimit;
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if(timeMaxed)
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{
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inHandler(1);
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inDone();
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return false;
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}
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return inHandler(timeCurrent / timeLimit);
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2021-08-04 13:12:35 -04:00
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};
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}
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document.querySelector("nav").addEventListener("click", function(inEvent)
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{
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2021-08-04 14:38:48 -04:00
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var domHtml = document.querySelector("html");
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var domGoal = document.querySelector(inEvent.target.getAttribute("href"));
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var posStart = domHtml.scrollTop - 200;
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var posRange = domGoal.getBoundingClientRect().top;
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var evtTick = function(inProgress){ domHtml.scrollTop = posStart + posRange*Math.sqrt(1 - Math.pow(1-(inProgress), 2)); };
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var evtDone = function(){ Spy.Resume(); };
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Spy.Suspend();
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Time.Add( JobDuration(0.4, evtTick, evtDone) );
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2021-08-04 13:12:35 -04:00
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inEvent.preventDefault();
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});
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</script>
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<script>
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var Spy =
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{
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Attribute:"data-spy",
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Members:[],
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Defaults:[0, 1, 0, 1],
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2021-08-04 14:38:48 -04:00
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Disabled:false,
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Suspend:function()
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{
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Spy.Disabled = true;
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},
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Resume:function()
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{
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Spy.Disabled = false;
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Spy.UpdateAll();
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},
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2021-08-04 13:12:35 -04:00
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UpdateAll:function()
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{
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var i, member, aabb, top, bottom, left, right;
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var visible;
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2021-08-04 14:38:48 -04:00
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if(Spy.Disabled){ return; }
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2021-08-04 13:12:35 -04:00
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for(i=0; i<Spy.Members.length; i++)
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{
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member = Spy.Members[i];
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top = window.innerHeight * member.Bounds[0];
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bottom = window.innerHeight * member.Bounds[1];
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left = window.innerWidth * member.Bounds[2];
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right = window.innerWidth * member.Bounds[3];
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aabb = member.Element.getBoundingClientRect();
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visible = (aabb.top < bottom && aabb.bottom > top) && (aabb.left < right && aabb.right > left);
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if(visible != member.Visible)
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{
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member.Element.setAttribute(Spy.Attribute, visible);
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member.Visible = visible;
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member.Change(visible);
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}
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}
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},
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Create:function(inElement)
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{
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var j, bounds;
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var attr;
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var obj;
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attr = inElement.getAttribute(Spy.Attribute)||"";
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inElement.removeAttribute(Spy.Attribute);
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bounds = attr.split("|");
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for(j=0; j<Spy.Defaults.length; j++)
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{
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if(bounds[j])
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{
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bounds[j] = parseFloat(bounds[j]);
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}
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else
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{
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bounds[j] = Spy.Defaults[j];
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}
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}
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obj = {
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Element:inElement,
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Bounds:bounds,
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Visible:undefined,
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Change:function(){}
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};
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Spy.Members.push(obj);
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return obj;
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},
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CreateAll:function()
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{
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var i, elements;
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elements = document.querySelectorAll("*["+Spy.Attribute+"]");
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for(i=0; i<elements.length; i++)
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{
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Spy.Create(elements[i]);
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}
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},
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Init:function()
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{
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Spy.CreateAll();
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Spy.UpdateAll();
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document.addEventListener("scroll", Spy.UpdateAll, {passive:true});
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window.addEventListener("resize", Spy.UpdateAll, {passive:true});
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}
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};
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Spy.Init();
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</script>
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</body>
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</html>
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