WFS to TopoJSON

How to build TopoJSON using geodata from a Web Feature Service (WFS). For more details on how a WFS works, I recommend Using a Web Feature Service.

Data from opendata.admin.ch © GIS-ZH

<!DOCTYPE html>
<meta charset="utf-8">
<style>

.grenze {
  fill: none;
  stroke: #cfcfcf;
  stroke-linejoin: round;
  stroke-linecap: round;
}
 
.gemeinde {
  fill: #f0f0f0;
}
 
.gemeinde :hover {
  fill: #d7d7d7;
}
 
.see {
  fill: #cbdbe9;
  stroke: #b0becb;
}
 
</style>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script src="https://d3js.org/topojson.v1.min.js"></script>
<script>
 
var width = 960,
    height = 960;
 
var path = d3.geo.path()
    .projection(null);
 
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);
 
d3.json("zh.json", function(error, zh) {
  svg.append("g")
      .attr("class", "gemeinde")
    .selectAll("path")
      .data(topojson.feature(zh, zh.objects.gemeinden).features)
    .enter().append("path")
      .attr("d", path);
 
  svg.append("g")
      .attr("class", "see")
    .selectAll("path")
      .data(topojson.feature(zh, zh.objects.seen).features)
    .enter().append("path")
      .attr("d", path);
 
  svg.append("path")
      .datum(topojson.mesh(zh, zh.objects.gemeinden, function(a, b) { return a !== b; }))
      .attr("class", "grenze")
      .style("stroke-width", "1px")
      .attr("d", path);
});

d3.select(self.frameElement).style("height", height + "px");
 
</script>

Modified http://d3js.org/d3.v3.min.js to a secure url

Modified http://d3js.org/topojson.v1.min.js to a secure url

https://d3js.org/d3.v3.min.js

https://d3js.org/topojson.v1.min.js