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jquery animation advice

Posted on 2014-02-24
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Last Modified: 2014-02-28
Hi all,

I want to create a small semi-interactive effect on my site.

Basically I have a number of balloon pngs.

I want to create instance off the bottom of the screen and animate them up across until the are out of bounds at the top where I destroy them.

I would like to have them animate some what randomly and want to try and avoid them being spawned in the same place?

I'm just after some avice on how to do this.
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Question by:flynny
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3 Comments
 
LVL 57

Accepted Solution

by:
Julian Hansen earned 500 total points
ID: 39882541
Here is something I knocked together. Animation is achieved with one line of chained JQuery calls.

<!doctype html>
<html>
<head>
<title>Test</title>
<script src="http://code.jquery.com/jquery.js"></script>
<script type="text/javascript">
var startheight = 0;
var startwidth = 0;
$(function() {
  startheight = $(window).height() + 100;
  startwidth = $(window).width() - 100;
  setTimeout('balloon()', 500);
});

function randomMinMax(min,max)
{
    return Math.floor(Math.random()*(max-min+1)+min);
}

function balloon()
{
  var timeout = randomMinMax(250,750);
  var animationspeed = randomMinMax(2500,10000);
  var leftspace = randomMinMax(100, startwidth);
  var pos = '0px -' + (randomMinMax(0,4) * 100) + 'px';
  $('#balloons')
    .append( 
      $('<div/>')
        .addClass('balloon')
        .css({top: startheight + 'px', left: leftspace + 'px', backgroundPosition: pos})
        .animate(
          {top : '-100px'}, 
          animationspeed,
          function() {
            $(this).remove();
          }
        )
    );
  
  setTimeout('balloon()', timeout);
}

</script>
<style type="text/css">
body, html, #balloons {
  height: 100%;
  margin: 0;
  padding: 0;
  overflow: hidden;
}
div.balloon {
  width: 100px;
  height: 75px;
  background-image: url(images/balloons.png);
  background-position: 0 0;
  background-repeat: no-repeat;
  position: absolute;
  top: -9999px;
  left: 90px;
}
</style>
</head>
<body>
<div id="balloons">
</div>
</body>
</html>

Open in new window

Working sample here
balloons.png
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Author Closing Comment

by:flynny
ID: 39894269
many thanks didnt expect code, it really helped.
0
 
LVL 57

Expert Comment

by:Julian Hansen
ID: 39894423
You are welcome - thanks for the points.
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