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Asked: 2026-06-09T22:17:33+00:00

I am attempting to make an element move randomly inside a <div> Thankfully, someone

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I am attempting to make an element move randomly inside a <div>

Thankfully, someone has found a solution which can be found here

However, when I run it on my local machine OR on a server, the element does not move.

Here is my source code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Untitled Document</title>

<style type="text/css">
div.a {
    width: 50px;
    height:50px;
    background-color:red;
    position:fixed;    
}​
</style>

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.0/jquery.min.js"></script>
<script>
$(document).ready(function(){
    animateDiv();

});

function makeNewPosition(){

    // Get viewport dimensions (remove the dimension of the div)
    var h = $(window).height() - 50;
    var w = $(window).width() - 50;

    var nh = Math.floor(Math.random() * h);
    var nw = Math.floor(Math.random() * w);

    return [nh,nw];    

}

function animateDiv(){
    var newq = makeNewPosition();
    var oldq = $('.a').offset();
    var speed = calcSpeed([oldq.top, oldq.left], newq);

    $('.a').animate({ top: newq[0], left: newq[1] }, speed, function(){
      animateDiv();        
    });

};

function calcSpeed(prev, next) {

    var x = Math.abs(prev[1] - next[1]);
    var y = Math.abs(prev[0] - next[0]);

    var greatest = x > y ? x : y;

    var speedModifier = 0.1;

    var speed = Math.ceil(greatest/speedModifier);

    return speed;

}​
</script>
</head>

<body>
    <div class='a'></div>​
</body>
</html>
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1 Answer

  1. Editorial Team

    Opening in Chrome, I got an error:

    Uncaught SyntaxError: Unexpected token ?

    It looks like there is a non-visible character after the ending brace in the javascript. Open with Notepad++ and delete the extra character.

    I have seen this happen when you copy and paste directly from a fiddle.

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