A simple treemap implementation using web technologies (DOM nodes, CSS styling and transitions) rather than a big canvas/svg/plugin.
Play with a demo.
-
Create a page with a DOM node (i.e. a
<div>) that will contain your treemap. -
Add the treemap to the node via something like
appendTreemap(document.getElementById('mynode'), mydata); -
Style the treemap using CSS.
The input data (mydata in the overview snippet) is a tree of nodes,
likely imported via a separate JSON file. Each node (including the
root) should contain data in the following format.
{
name: (HTML that is displayed via .innerHTML on the caption),
data: {
"$area": (a number, in arbitrary units)
},
children: (list of child tree nodes)
}
(This strange format for data comes from the the JavaScript InfoVis Toolkit. I might change it in the future.)
The $area of a node should be the sum of the $area of all of its
children.
(At runtime, tree nodes will dynamically will gain two extra
attributes, parent and dom; this is only worth pointing out so
that you don't accidentally conflict with them.)
The treemap is constructed with one div per region with a separate
div for the caption. Each div is styleable via the
webtreemap-node CSS class. The captions are stylable as
webtreemap-caption.
Each level of the tree also gets a per-level CSS class,
webtreemap-level0 through webtreemap-level4. These can be
adjusted to e.g. made different levels different colors. To control
the caption on a per-level basis, use a CSS selector like
.webtreemap-level2 > .webtreemap-caption.
Your best bet is to modify the included webtreemap.css, which
contains comments about required and optional CSS attributes.