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POHow can I add zooming to the d3 collapsible tree example?
 

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  1. POHow can I add zooming to the d3 collapsible tree example?
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    <p>I am trying to add a zooming feature to the d3 collapsible tree <a href="http://mbostock.github.io/d3/talk/20111018/tree.html" rel="nofollow noreferrer">example</a>, but can't get it to work. I know there's been a question about this <a href="https://stackoverflow.com/questions/17405638/d3-js-zooming-and-panning-a-collapsible-tree-diagram">here</a> and even though it seems rather thorough my changes don't work. The only thing I get is a white page. Probably has to do with the fact that I'm rather new with javascript/d3. Here is my code.</p> <pre><code>&lt;!DOCTYPE html&gt; &lt;meta charset="utf-8"&gt; &lt;style&gt; svg { pointer-events: all; } .node { cursor: pointer; } .node circle { fill: #fff; stroke: steelblue; stroke-width: 1.5px; } tree { pointer-events: all; } .node text { font: 12px sans-serif; } .link { fill: none; stroke: #ccc; stroke-width: 1.5px; } &lt;/style&gt; &lt;body&gt; &lt;script src="d3.v3.min.js"&gt;&lt;/script&gt; &lt;script&gt; var margin = {top: 20, right: 120, bottom: 20, left: 120}, width = 1500 - margin.right - margin.left, height = 800 - margin.top - margin.bottom; var i = 0, duration = 750, root; var tree = d3.layout.tree() .size([height, width]); var diagonal = d3.svg.diagonal() .projection(function(d) { return [d.y, d.x]; }); var svg = d3.select("body").append("svg") .attr("width", width + margin.right + margin.left) .attr("height", height + margin.top + margin.bottom) .append("g") .attr("transform", "translate(" + margin.left + "," + margin.top + ")") d3.json("flare.json", function(error, flare) { root = flare; root.x0 = height / 2; root.y0 = 0; function collapse(d) { if (d.children) { d._children = d.children; d._children.forEach(collapse); d.children = null; } } root.children.forEach(collapse); update(root); }); d3.select(self.frameElement).style("height", "800px"); function update(source) { // Compute the new tree layout. var nodes = tree.nodes(root).reverse(), links = tree.links(nodes); // Normalize for fixed-depth. nodes.forEach(function(d) { d.y = d.depth * 180; }); // Update the nodes… var node = svg.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("g") .attr("class", "node") .attr("transform", function(d) { return "translate(" + source.y0 + "," + source.x0 + ")"; }) .on("click", click); nodeEnter.append("circle") .attr("r", 1e-6) .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; }); nodeEnter.append("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 = svg.selectAll("path.link") .data(links, function(d) { return d.target.id; }); // Enter any new links at the parent's previous position. link.enter().insert("path", "g") .attr("class", "link") .attr("d", function(d) { var o = {x: source.x0, y: source.y0}; return diagonal({source: o, target: o}); }); // 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; }); d3.select("svg") .call(d3.behavior.zoom() .scaleExtent([0.5, 5]) .on("zoom", zoom)); } // Toggle children on click. function click(d) { if (d.children) { d._children = d.children; d.children = null; } else { d.children = d._children; d._children = null; } update(d); function zoom() { var scale = d3.event.scale, translation = d3.event.translate, tbound = -h * scale, bbound = h * scale, lbound = (-w + m[1]) * scale, rbound = (w - m[3]) * scale; // limit translation to thresholds translation = [ Math.max(Math.min(translation[0], rbound), lbound), Math.max(Math.min(translation[1], bbound), tbound) ]; d3.select(".drawarea") .attr("transform", "translate(" + translation + ")" + " scale(" + scale + ")"); } } &lt;/script&gt; </code></pre> <p>Why does the zoom implementation not work? </p>
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    1. COIt seems that nothing has the class `drawarea`, which you are selecting in the `zoom` function.
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      1. USLars Kotthoff
 

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