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POUpdating SVG Element Z-Index With D3
 

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    <p>What is an effective way to bring an SVG element to the top of the z-order, using the D3 library?</p> <p>My specific scenario is a pie chart which highlights (by adding a <code>stroke</code> to the <code>path</code>) when the mouse is over a given piece. The code block for generating my chart is below:</p> <pre><code>svg.selectAll("path") .data(d) .enter().append("path") .attr("d", arc) .attr("class", "arc") .attr("fill", function(d) { return color(d.name); }) .attr("stroke", "#fff") .attr("stroke-width", 0) .on("mouseover", function(d) { d3.select(this) .attr("stroke-width", 2) .classed("top", true); //.style("z-index", 1); }) .on("mouseout", function(d) { d3.select(this) .attr("stroke-width", 0) .classed("top", false); //.style("z-index", -1); }); </code></pre> <p>I've tried a few options, but no luck so far. Using <code>style("z-index")</code> and calling <code>classed</code> both did not work.</p> <p>The "top" class is defined as follows in my CSS:</p> <pre><code>.top { fill: red; z-index: 100; } </code></pre> <p>The <code>fill</code> statement is there to make sure I knew it was turning on/off correctly. It is.</p> <p>I've heard using <code>sort</code> is an option, but I'm unclear on how it would be implemented for bringing the "selected" element to the top.</p> <p><strong>UPDATE:</strong></p> <p>I fixed my particular situation with the following code, which adds a new arc to the SVG on the <code>mouseover</code> event to show a highlight.</p> <pre><code>svg.selectAll("path") .data(d) .enter().append("path") .attr("d", arc) .attr("class", "arc") .style("fill", function(d) { return color(d.name); }) .style("stroke", "#fff") .style("stroke-width", 0) .on("mouseover", function(d) { svg.append("path") .attr("d", d3.select(this).attr("d")) .attr("id", "arcSelection") .style("fill", "none") .style("stroke", "#fff") .style("stroke-width", 2); }) .on("mouseout", function(d) { d3.select("#arcSelection").remove(); }); </code></pre>
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