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README.markdown

webtreemap

A simple treemap implementation using web technologies (DOM nodes, CSS styling and transitions) rather than a big canvas/svg/plugin.

Play with a demo.

Creating your own

  1. Create a page with a DOM node (i.e. a <div>) that will contain your treemap.
  2. Add the treemap to the node via something like

    appendTreemap(document.getElementById('mynode'), mydata);
    
  3. Style the treemap using CSS.

Input format

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.)

CSS styling

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.

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