How to position a DIV beneath a fixed DIV with dynamic size
Question
I got something like a navigation bar which is fixed on the top of the side. Now I want to have a content-DIV which is beneath it. The problem is, that the navigation bar has no fixed height.
How can I achieve this?
HTML:
<div id="nav">
this is my navigation bar
</div>
<div id="content">
HERE <br>
IS <br>
MUCH <br>
CONTENT
</div>
CSS:
#nav {
position: fixed;
background: lightblue;
}
JSFIDDLE: enter link description here
1 answers
solution1
2 ACCPTED 2018-06-17 17:00:44
Pure Javascript solution
With javascript, you can get the height and the position of your <div id="nav"> and use them to compute the position of your <div id="content"> :
var navDivElement = document.getElementById("nav");
var contentDivElement = document.getElementById("content");
contentDivElement.style.top = navDivElement.clientHeight + navDivElement.getBoundingClientRect().top + 'px';
Presision
How to get the position of an element:
var rect = element.getBoundingClientRect();
console.log(rect.top, rect.right, rect.bottom, rect.left);
Source: https://stackoverflow.com/a/11396681/4032282
How to get the dimensions of an element:
var e = document.getElementById('id')
console.log(e.clientHeight, e.offsetHeight, e.scrollHeight);
-
clientHeightincludes the height and vertical padding. -
offsetHeightincludes the height, vertical padding, and vertical borders. -
scrollHeightincludes the height of the contained document (would be greater than just height in case of scrolling), vertical padding, and vertical borders.
Source: https://stackoverflow.com/a/526352/4032282
CSS Sticky solution
Change the position: fixed; of the nav by position: sticky; and add a top: 0; .
That way the <div id="content"> will be placed under the nav, but the nav will stay on the top of his container.
<html>
<head>
<style>
#nav {
position: sticky;
top: 0;
}
/* Allow you to play with the browser height to make the vertical scroll appears and use it to see that the nav will stay on top */
#content {
height: 500px;
background-color: #ff0000;
}
</style>
</head>
<body>
<div id="nav">NAV</div>
<div id="content">CONTENT</div>
</body>
</html>
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