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    <p>Here's one implementation: <a href="http://jsfiddle.net/tBHyD/2/" rel="nofollow">http://jsfiddle.net/tBHyD/2/</a></p> <p>I only tried to address the setup in the question, not the full implementation noted in your comment. There are lots of ways to accomplish this; this one uses an event-driven model, using <code>d3.dispatch</code>:</p> <pre><code> var evt = d3.dispatch("change"); </code></pre> <p>The key here is to update the scale extents globally, then fire an event if they've changed. Here I use a function, <code>updateExtent</code>, for this purpose:</p> <pre><code> var x0 = Infinity, x1 = -Infinity, y0 = Infinity, y1 = -Infinity; function updateExtent(data) { var extx = d3.extent(data, function(d) { return d[0]; }), exty = d3.extent(data, function(d) { return d[1]; }), changed; // update if (extx[0] &lt; x0) { x0 = extx[0]; changed = true; } if (extx[1] &gt; x1) { x1 = extx[1]; changed = true; } if (exty[0] &lt; y0) { y0 = exty[0]; changed = true; } if (exty[1] &gt; y1) { y1 = exty[1]; changed = true; } // if changed, update scales and fire event if (changed) { // update scales x.domain([x0, x1]); y.domain([y1, y0]); // update axes vis.select(".x.axis").call(xAxis); vis.select(".y.axis").call(yAxis); // fire event evt.change(); } } </code></pre> <p>Then the <code>redraw</code> function sets a listener:</p> <pre><code> function redraw(selection, data, style) { var bar = selection.selectAll(".bar") .data(data); // enter bar.enter().append("rect") .attr('class', "bar") .attr("width", 5) .style(style); function updateBar() { // update bar .attr("x", function(d) { return x(d[0]) - .5; }) .attr("y", function(d) { return y(d[1]); }) .attr("height", function(d) { return height - y(d[1]); }); } // initial call updateBar(); // handler call evt.on("change", updateBar); }; </code></pre> <p>Note that now you don't need to set the extent explicitly:</p> <pre><code> var data1 = [[2,0.5], [4,0.8], [6,0.6], [8,0.7], [12,0.8]]; updateExtent(data1); </code></pre>
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    1. COThank you so much for this great answer! I did not know about d3.dispatch - this is exactly what I was looking for and the code is much more concise now. This stuff is not covered in the introductory book by Murray. Is there something you recommend that covers the "advanced" topics?
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    2. COThe API docs :). Seriously, though, I don't know if there's a D3 book that would cover evented models, as I haven't seen many examples that use this; `d3.dispatch` is listed under "Internals" in the API. It's not a bad architecture for coordinating components, though.
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