D3 tree graph with links

Question

I am new to d3.js library.

I am trying to create a tree, like this one , but with a link to an external page on each node.

Is it possible?

I tried adding "svg: a" to each node, but as a result the whole tree will disappear.

Update:

I am taking this code from the html page linked above.

Associated Libraries:

• d3.js
• d3.layout.js

This is all the code:

<style type="text/css"> .node circle { cursor: pointer; fill: #fff; stroke: steelblue; stroke-width: 1.5px; } .node text { font-size: 11px; } path.link { fill: none; stroke: #ccc; stroke-width: 1.5px; } </style> <script> var m = [20, 120, 20, 120], w = 1280 - m[1] - m[3], h = 800 - m[0] - m[2], i = 0, root; var tree = d3.layout.tree() .size([h, w]); var diagonal = d3.svg.diagonal() .projection(function(d) { return [dy, dx]; }); var vis = d3.select("#body").append("svg:svg") .attr("width", w + m[1] + m[3]) .attr("height", h + m[0] + m[2]) .append("svg:g") .attr("transform", "translate(" + m[3] + "," + m[0] + ")"); d3.json("flare.json", function(json) { root = json; root.x0 = h / 2; root.y0 = 0; function toggleAll(d) { if (d.children) { d.children.forEach(toggleAll); toggle(d); } } // Initialize the display to show a few nodes. root.children.forEach(toggleAll); toggle(root.children[1]); toggle(root.children[1].children[2]); toggle(root.children[9]); toggle(root.children[9].children[0]); update(root); }); function update(source) { var duration = d3.event && d3.event.altKey ? 5000 : 500; // Compute the new tree layout. var nodes = tree.nodes(root).reverse(); // Normalize for fixed-depth. nodes.forEach(function(d) { dy = d.depth * 180; }); // Update the nodes… var node = vis.selectAll("g.node") .data(nodes, function(d) { return d.id || (d.id = ++i); }); // Enter any new nodes at the parent previous position. var nodeEnter = node.enter().append("svg:g") .attr("class", "node") .attr("transform", function(d) { return "translate(" + source.y0 + "," + source.x0 + ")"; }) .on("click", function(d) { toggle(d); update(d); }); nodeEnter.append("svg:circle") .attr("r", 1e-6) .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; }); nodeEnter.append("svg:text") .attr("x", function(d) { return d.children || d._children ? -10 : 10; }) .attr("dy", ".35em") .attr("text-anchor", function(d) { return d.children || d._children ? "end" : "start"; }) .text(function(d) { return d.name; }) .style("fill-opacity", 1e-6); // Transition nodes to their new position. var nodeUpdate = node.transition() .duration(duration) .attr("transform", function(d) { return "translate(" + dy + "," + dx + ")"; }); nodeUpdate.select("circle") .attr("r", 4.5) .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; }); nodeUpdate.select("text") .style("fill-opacity", 1); // Transition exiting nodes to the parent new position. var nodeExit = node.exit().transition() .duration(duration) .attr("transform", function(d) { return "translate(" + source.y + "," + source.x + ")"; }) .remove(); nodeExit.select("circle") .attr("r", 1e-6); nodeExit.select("text") .style("fill-opacity", 1e-6); // Update the links… var link = vis.selectAll("path.link") .data(tree.links(nodes), function(d) { return d.target.id; }); // Enter any new links at the parent previous position. link.enter().insert("svg:path", "g") .attr("class", "link") .attr("d", function(d) { var o = {x: source.x0, y: source.y0}; return diagonal({source: o, target: o}); }) .transition() .duration(duration) .attr("d", diagonal); // Transition links to their new position. link.transition() .duration(duration) .attr("d", diagonal); // Transition exiting nodes to the parent new position. link.exit().transition() .duration(duration) .attr("d", function(d) { var o = {x: source.x, y: source.y}; return diagonal({source: o, target: o}); }) .remove(); // Stash the old positions for transition. nodes.forEach(function(d) { d.x0 = dx; d.y0 = dy; }); } // Toggle children. function toggle(d) { if (d.children) { d._children = d.children; d.children = null; } else { d.children = d._children; d._children = null; } } </script> 

Basically, I tried to add this piece of code just before nodeEnter.append("svg:text")

  nodeEnter.append("svg:a") .attr("x", function(d) { return d.children || d._children ? -10 : 10; }) .attr("dy", ".35em") .attr("text-anchor", function(d) { return d.children || d._children ? "end" : "start"; }) .text("http://example.com") .style("fill-opacity", 1e-6); 

Answer 1

Try adding an action directly to the node, as shown below, and swapping the cursor to a pointer to give a hint to the user.

  var node = vis.selectAll("g.node") .data(nodes, function(d) { return d.id || (d.id = ++i); }) .style("cursor", "pointer") .on("click", function() { window.open("http://www.stackoverflow.com", '_blank').focus(); }); 

Answer 2

You should be able to add an HTML link to any of the objects you want by adding the a tag as follows (this example is for the text associated with each node);

  nodeEnter.append("a") .attr("xlink:href", "http://example.com") .append("svg:text") .attr("x", function(d) { return d.children || d._children ? -10 : 10; }) .attr("dy", ".35em") .attr("text-anchor", function(d) { return d.children || d._children ? "end" : "start"; }) .text(function(d) { return d.name; }) .style("fill-opacity", 1e-6); 

If you had a separate URL associated with each node (suppose it's called link ), it's just a matter of getting the URL with a function call like this;

  nodeEnter.append("a") .attr("xlink:href", function(d) { return d.link; }) .append("svg:text") .attr("x", function(d) { return d.children || d._children ? -10 : 10; }) .attr("dy", ".35em") .attr("text-anchor", function(d) { return d.children || d._children ? "end" : "start"; }) .text(function(d) { return d.name; }) .style("fill-opacity", 1e-6); 

For a more complete description of adding a link, see here: https://leanpub.com/D3-Tips-and-Tricks/read#leanpub-auto-adding-web-links-to-d3js-objects

For information on tree diagrams, see here: https://leanpub.com/D3-Tips-and-Tricks/read#leanpub-auto-tree-diagrams