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I am trying to achive a fixed position after a certain point of the page is passed using CSS JS and HTML. Also I don't know the bet aproach in loading the function into the html doc, I was thinking on using the onload...
Here is what I have done until now:
<!DOCTYPE html>
<html>
<head>
<script>
var left1 = document.getElementById("left1");
var origOffsetY = left1.offsetTop;
function onScroll(e) {
window.scrollY >= origOffsetY ? left1.style.position = "fixed":
left1.style.position="absolute";
}
document.addEventListener('scroll', onScroll);
</script language="JavaScript">
<style>
#main {
position: relative;
width: 620px;
margin: 0 auto;
height: 1800px;
}
#left1{
position: absolute;
font-family: sans-serif;
left: 0px;
top: 10px;
height: 200px;
width: 300px;
background-color: #F6D565;
}
#right1{
position:absolute;
font-family: sans-serif;
top: 10px;
right: 0px;
height: 300px;
width: 300px;
background-color: #DFFCC2;
}
#right2{
position:absolute;
top: 320px;
right: 0px;
font-family: sans-serif;
height:300px;
width: 300px;
background-color: #DFFCC2;
}
#right3{
position:absolute;
top: 630px;
right: 0px;
font-family: sans-serif;
height: 300px;
width: 300px;
background-color: #DFFCC2;
}
</style>
</head>
<body >
<div id="main">
<div id="left1">aaaaaaaaaaaaaaaaaaaa</div>
<div id="right1">bbb</div>
<div id="right2">cccccccccccccccccccccc</div>
<div id="right3">ddd</div>
</div>
</body>
</html>
610
DEMO
The DOM is not available when you are trying to access div with id left1.
So your first line var left1 = document.getElementById("left1"); will give error.
Instead Wrap your current code within window.onload
<script>
window.onload = function() {
var left1 = document.getElementById("left1");
var origOffsetY = left1.offsetTop;
function onScroll(e) {
console.log("calling scroll")
window.scrollY >= origOffsetY ? left1.style.position = "fixed":
left1.style.position="absolute";
}
document.addEventListener('scroll', onScroll);
}
</script>
Else place your javascript just above the </body> tag
130
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