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    <p>There are <a href="https://github.com/mbostock/d3/wiki/Gallery" rel="noreferrer">lots of examples</a> showing how to add labels to graph and tree visualizations, but I'd probably start with this one as the simplest:</p> <ul> <li><a href="http://bl.ocks.org/950642" rel="noreferrer">http://bl.ocks.org/950642</a></li> </ul> <p>You haven’t posted a link to your code, but I'm guessing that <code>node</code> refers to a selection of SVG circle elements. You can’t add text elements to circle elements because <strong>circle elements are not <a href="http://www.w3.org/TR/SVG/intro.html#TermContainerElement" rel="noreferrer">containers</a></strong>; adding a text element to a circle will be ignored.</p> <p>Typically you use a G element to group a circle element (or an image element, as above) and a text element for each node. The resulting structure looks like this:</p> <pre><code>&lt;g class="node" transform="translate(130,492)"&gt; &lt;circle r="4.5"/&gt; &lt;text dx="12" dy=".35em"&gt;Gavroche&lt;/text&gt; &lt;/g&gt; </code></pre> <p>Use a <a href="http://bost.ocks.org/mike/join/" rel="noreferrer">data-join</a> to create the G elements for each node, and then use <a href="https://github.com/mbostock/d3/wiki/Selections#wiki-append" rel="noreferrer">selection.append</a> to add a circle and a text element for each. Something like this:</p> <pre><code>var node = svg.selectAll(".node") .data(nodes) .enter().append("g") .attr("class", "node") .call(force.drag); node.append("circle") .attr("r", 4.5); node.append("text") .attr("dx", 12) .attr("dy", ".35em") .text(function(d) { return d.name }); </code></pre> <p>One downside of this approach is that you may want the labels to be drawn on top of the circles. Since SVG does not yet support z-index, elements are drawn in document order; so, the above approach causes a label to be drawn <em>above its circle</em>, but it may be drawn <em>under other circles</em>. You can fix this by using two data-joins and creating separate groups for circles and labels, like so:</p> <pre><code>&lt;g class="nodes"&gt; &lt;circle transform="translate(130,492)" r="4.5"/&gt; &lt;circle transform="translate(110,249)" r="4.5"/&gt; … &lt;/g&gt; &lt;g class="labels"&gt; &lt;text transform="translate(130,492)" dx="12" dy=".35em"&gt;Gavroche&lt;/text&gt; &lt;text transform="translate(110,249)" dx="12" dy=".35em"&gt;Valjean&lt;/text&gt; … &lt;/g&gt; </code></pre> <p>And the corresponding JavaScript:</p> <pre><code>var circle = svg.append("g") .attr("class", "nodes") .selectAll("circle") .data(nodes) .enter().append("circle") .attr("r", 4.5) .call(force.drag); var text = svg.append("g") .attr("class", "labels") .selectAll("text") .data(nodes) .enter().append("text") .attr("dx", 12) .attr("dy", ".35em") .text(function(d) { return d.name }); </code></pre> <p>This technique is used in the <a href="http://bl.ocks.org/1153292" rel="noreferrer">Mobile Patent Suits</a> example (with an additional text element used to create a white shadow).</p>
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