How to make force layout graph in D3.js responsive to screen/browser size

I have a graph using force layout, but it has a fixed width w and height h:

var svg = d3.select("#viz").append("svg")
            .attr("id", "playgraph")
            .attr("width", w)
            .attr("height", h)

var force = d3.layout.force()
              .nodes(nodes)
              .links(links)
              .charge(-1600)
              .linkDistance(45)
              .size([w, h]); 

which results in a svg graph that does not scale or down despite of changes in screen or browser window size. In order to make it responsive (i.e. automatically resizes itself), I tried using viewBox and preserveAspectRatio attributes:

var svg = d3.select("#viz").append("svg")
            .attr("id", "playgraph")
            .attr("width", w)
            .attr("height", h)
            .attr("viewBox", "0, 0, 600, 400")
            .attr("preserveAspectRatio", "xMidYMid meet");

Unfortunately, this didn't work as nothing happens when I adjust the browser window size. I wonder if the .size([w, h]) of the force graph has anything to do with this.

Please shed some light on how to use viewBox and preserveAspectRatio attributes with force layout graphs.

Solution 1:

The problem is not within .size(), it's that you are stating the SVG dimensions in .attr("width", w) .attr("height", h). Remove these two attributes and you'll get it right...

var svg = d3.select("#viz").append("svg")
            .attr("id", "playgraph")
             //better to keep the viewBox dimensions with variables
            .attr("viewBox", "0 0 " + w + " " + h )
            .attr("preserveAspectRatio", "xMidYMid meet");

http://jsfiddle.net/aaSjd/

Solution 2:

The solution shown here: http://bl.ocks.org/mbostock/3355967 worked well for me!

window.addEventListener('resize', resize); 

function resize() {
    var width = window.innerWidth, height = window.innerHeight;
    svg.attr("width", width).attr("height", height);
    force.size([width, height]).resume();
}

Make sure to run resize() after you have appended all your lines, nodes etc as well.

Solution 3:

Duopixel is very close to what I needed, except I don't know why he nested two <g> elements and attached the event listeners to the outermost <g> (also requiring an invisible rectangle behind everything to make the g react to events over its whole space).

It's easier to attach the listeners to the <svg> itself and then you only need one internal <g>.

Here is my full-screen force-directed example:

var width = 1000,
    height = 1000;

var color = d3.scale.category20();

var svg = d3.select("body")
    .append("svg")
      .attr({
        "width": "100%",
        "height": "100%"
      })
      .attr("viewBox", "0 0 " + width + " " + height )
      .attr("preserveAspectRatio", "xMidYMid meet")
      .attr("pointer-events", "all")
    .call(d3.behavior.zoom().on("zoom", redraw));

var vis = svg
    .append('svg:g');

function redraw() {
  vis.attr("transform",
      "translate(" + d3.event.translate + ")"
      + " scale(" + d3.event.scale + ")");
}

function draw_graph(graph) {
  var force = d3.layout.force()
      .charge(-120)
      .linkDistance(30)
      .nodes(graph.nodes)
      .links(graph.links)
      .size([width, height])
      .start();

  var link = vis.selectAll(".link")
      .data(graph.links)
      .enter().append("line")
      .attr("class", "link")
      .style("stroke-width", function(d) { return Math.sqrt(d.value); });

  var node = vis.selectAll(".node")
      .data(graph.nodes)
      .enter().append("circle")
      .attr("class", "node")
      .attr("r", 5)
      .style("fill", function(d) { return color(d.group); })
      .call(force.drag);

  node.append("title")
      .text(function(d) { return d.name; });

  force.on("tick", function() {
    link.attr("x1", function(d) { return d.source.x; })
        .attr("y1", function(d) { return d.source.y; })
        .attr("x2", function(d) { return d.target.x; })
        .attr("y2", function(d) { return d.target.y; });

    node.attr("cx", function(d) { return d.x; })
        .attr("cy", function(d) { return d.y; });
  });
};

draw_graph(data);