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POD3.js parsing error - rotation of orthogonal map projection
 

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  1. POD3.js parsing error - rotation of orthogonal map projection
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    <p>I have an orthogonal projection of the world map, in D3 and by using TopoJSON. I am coloring the countries with each loading of data by calling this code. The globe rotates constantly. </p> <p>My problem is, that during rotating I get the error message:</p> <h2>Error</h2> <p><b>>> Error: Problem parsing d="" >> in d3.v3.min.js:1</b></p> <p>for each: </p> <pre><code> .attr("d", path); </code></pre> <p>First, I thought that it depends on the topojson script because there are different versions. But it didn't. </p> <h3>javascript code:</h3> <p>init the properties of the globe / projection:</p> <pre><code>svg.append("defs").append("path") .datum({type: "Sphere"}) .attr("id", "sphere") .attr("d", path); ... svg.append("path") .datum(graticule) .attr("class", "graticule") .attr("d", path); </code></pre> <p>read the data from json and tsv and append land and countries:</p> <pre><code>queue() .defer(d3.json, "world-110m.json") .defer(d3.tsv, "world-country-names.tsv") .await(ready); function ready(error, world, names) { var countries = topojson.feature(world, world.objects.countries).features,; i = -1, n = countries.length; countries.forEach(function(d) { var tryit = names.filter(function(n) { return d.id == n.id; })[0]; if (typeof tryit === "undefined"){ d.name = "Undefined"; console.log(d); } else { d.name = tryit.name; } }); var country = svg.selectAll(".country").data(countries); country .enter().insert("path", ".graticule") .attr("id", function(d){ return "c" + d.id; }) .attr("d", path); svg.insert("path", ".graticule") .datum(topojson.mesh(world, world.objects.countries, function(a, b) { return a !== b; })) .attr("class", "boundary") .attr("d", path); } </code></pre> <p>rotation of the globe:</p> <pre><code>var velocity = .03, then = Date.now(); d3.timer(function() { var angle = velocity * (Date.now() - then); projection.rotate([angle,0,0]); svg.selectAll("path") .attr("d", path.projection(projection)); }); </code></pre>
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    1. COIt's very hard to get good answers on SO with a giant block of code. Can you narrow this down to the part that throws the error? Which path is having trouble?
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    2. COOh, sorry. Now, I deleted some lines where I am sure that there is no mistake and the divided the code into sections. Maybe, now, it is a bit more readable :/
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    3. COOk, so all calls to `.attr("d", path)` are failing? That suggests you're not bind the data you expect - try wrapping `path` in a function so you can inspect the input...
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