I am using a d3.js tree, and would like to add nodes dynamically, rather than pre-loading the entire tree.
How would i modify the following in order to dynamically add additional JSON nodes when a node is clicked? (see link below, and code below)
http://mbostock.github.com/d3/talk/20111018/tree.html
So rather than pre-loading the entire tree, instead i would like to retrieve the child nodes only when the parent is clicked. I can retrieve the json for the child nodes in the toggle function, however i can't figure out how i can add them to the tree.
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 [d.y, d.x]; }); 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) { d.y = 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's 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(" + d.y + "," + d.x + ")"; }); 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's 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's 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's 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 = d.x; d.y0 = d.y; }); } // Toggle children. function toggle(d) { // I could retrieve the child nodes here, but how to add them to the tree? if (d.children) { d._children = d.children; d.children = null; } else { d.children = d._children; d._children = null; } }
I was able to dynamically add nodes by adding the following code in the toggle function:
$.getJSON(addthese.json, function(addTheseJSON) { var newnodes = tree.nodes(addTheseJSON.children).reverse(); d.children = newnodes[0]; update(d); });
Notes: I am using jQuery to retrieve the json file
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