Keep the footer at the bottom with Javascript

Question

At the moment I'm trying to keep the footer at the bottom with Javascript. This is the result:

document.getElementsByTagName('body').onload = function() {KeepFoot()};
var element = document.getElementById('container');
var height = element.offsetHeight;

function KeepFoot() {
    if (height < screen.height) {
        document.getElementById("footer").style.position = "fixed";
        document.getElementById("footer").style.bottom = "0";
        document.getElementById("footer").style.left = "0";
        document.getElementById("footer").style.right = "0";
    }
}

My idea was to take the height of the div container and compare it with the height of the resolution of the pc. If the height of the div container is smaller than the height of the resolution of the PC, set to the div footer position: fixed;

But there is a problem in the script because it doesn't work.

Another question, the script that I created would be fine for keep the footer at the bottom?

HTML:

<html>
    <head>
        ...
    </head>
    <body>
        <div id="container">
            <div id="header"></div>
            <div id="content"></div>
            <div id="footer"></div>
        </div>
    </body>
</html>

Why not use the [CSS sticky footer](http://ryanfait.com/sticky-footer/) ([HTML5 version](http://ryanfait.com/html5-sticky-footer/)) method? — MDEV, May 16 '15 at 14:59

Ganesh Uppinivalasa · Answer 1 · 2015-05-20T07:32:26.077

The function is not being called on load. You can attach the function KeepFoot directly to the body tag like this Instead of calling like this:

 document.getElementsByTagName('body').onload = function() {KeepFoot()};

or use my code from below:

 (function() {
    var offsetHeight = document.getElementById('container').offsetHeight;   
    var screenHeight = screen.height;

if(offsetHeight < screenHeight){
    document.getElementById("footer").style.position = "fixed";
    document.getElementById("footer").style.bottom = "0";
    document.getElementById("footer").style.left = "0";
}
})();

jad-panda · Accepted Answer · 2015-05-16T15:14:15.263

3

"DOMContentLoaded" event only fires when document is ready similar to jquery's $(document.ready).

and, for styles you can use class instead of setting each style using javascript.

Code

document.addEventListener("DOMContentLoaded", function (event) {
    var element = document.getElementById('container');
    var height = element.offsetHeight;
    if (height < screen.height) {
        document.getElementById("footer").classList.add('stikybottom');
    }
}, false);

#footer.stikybottom {
    position: fixed;
    bottom:0;
    left: 0;
    right:0;
}

<div id="container">
    <div id="header">header</div>
    <div id="content">Conent</div>
    <div id="footer">Something in footer</div>
</div>

edited May 16 '15 at 15:14

answered May 16 '15 at 15:02

jad-panda

2,509
16
22

Please add an explanation of what your code does and why you wrote it that way. Code-only answers are generally frowned upon. – AJ Richardson May 16 '15 at 15:04
Thanks jed-panda, now it works. And thanks for the suggestion to add a class. – Keaire May 16 '15 at 16:05
This won't work if the screen height is too small to fit the footer + the content. – Adam Arold Oct 16 '17 at 21:08
screen.height returns the height of the user's screen including the interface features like the Windows Taskbar or Macs Dock. If you want the true height available for the browser, you should use the other function screen.availHeight – Youstanzr Jan 23 '23 at 07:58

score 2 · Answer 3 · answered May 16 '15 at 14:54

I thing your function works very well. maybe what is missing is the function calling.

function KeepFoot() {
    if (height < screen.height) {
        document.getElementById("footer").style.position = "fixed";
        document.getElementById("footer").style.bottom = "0";
        document.getElementById("footer").style.left = "0";
        document.getElementById("footer").style.right = "0";
    }
}

KeepFoot();

see this jsfiddle

score 0 · Answer 4 · edited May 16 '15 at 16:26

0

If what you want is to maintain the footer on the bottom of the page, you must read this. cssreset.com/how-to-keep-footer-at-bottom-of-page-with-css/

You can do it without js.

edited May 16 '15 at 16:26

gvlasov

18,638
21
74
110

answered May 16 '15 at 15:05

Eduardo Pérez

488
3
10

Keep the footer at the bottom with Javascript

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