insert the spin.js spinner into a div?

just found spin.js and it seems like a life saver.

The question is how to i insert the spinner into my div?

I have a follow button, that when clicked i remove the background image and currently replace with a loader.gif.

How can i do the same but with spin.js?

I knocked up a quick example of jsfiddle:

I would like the spinner to be inside the red square div.

<div id="foo"></div>
<button id="spin"> Spin! </button>

var opts = {
  lines: 13, // The number of lines to draw
  length: 17, // The length of each line
  width: 8, // The line thickness
  radius: 21, // The radius of the inner circle
  corners: 1, // Corner roundness (0..1)
  rotate: 58, // The rotation offset
  direction: 1, // 1: clockwise, -1: counterclockwise
  color: '#fff', // #rgb or #rrggbb or array of colors
  speed: 0.9, // Rounds per second
  trail: 100, // Afterglow percentage
  shadow: false, // Whether to render a shadow
  hwaccel: false, // Whether to use hardware acceleration
  className: 'spinner', // The CSS class to assign to the spinner
  zIndex: 2e9, // The z-index (defaults to 2000000000)
  top: '50%', // Top position relative to parent
  left: '50%' // Left position relative to parent
};

$("#spin").click(function(){
  var target = document.getElementById('foo');
  var spinner = new Spinner(opts).spin(target);
});

#foo {
    width: 50px;
    height: 50px;
    background-color: #f00;
}

Solution

You just need to set:

#foo {
   position: relative; //Added this
   width: 50px;
   height: 50px;
   background-color: #f00;
}

JsFiddle

This is actually a css issue really. By default the .spinner div is set to position: absolute (and you can't change that with css because it's an inline style), which means it's going to be positioned in the middle of the nearest positioned ancestor, which I'm assuming was the <body> tag (feel free to correct me here). By making #foo have a relative position, it becomes a positioned ancestor, and the spinner will sit inside it.