D3 Examples - Force Layout v4 with Filters

xxxxxxxxxx
 
<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
.links line {
  stroke: #aaa;
}
​
.nodes circle {
  pointer-events: all;
  stroke: none;
  stroke-width: 40px;
}
  
#parent_div{
  width: 400px;
  height: 100px;
  margin-right: 10px;
  float: left;
}
.child_div_1, .child_div_2 {
  float: left;
  margin-right: 5px;
}
​
</style>
<body>
    Select Category: 
  <div id = 'catdropdown'></div>
</body>
<svg width="960" height="400"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
​
<script>
​
var svg = d3.select("svg"),
    width = +svg.attr("width"),
    height = +svg.attr("height");
​
var simulation = d3.forceSimulation()
    .force("link", d3.forceLink().id(function(d) { return d.id; }))
    .force("charge", d3.forceManyBody())
    .force("center", d3.forceCenter(width / 2, height / 2));
​
var color = d3.scaleOrdinal(d3.schemeCategory10);
​
  
d3.json("miserables.json", function(error, graph) {
  if (error) throw error;
​
  var currNodes = graph.nodes
  var currLinks = graph.links
  
  var nodesByGroup = d3.nest()
  .key(function(d) { return d.group; })
  .entries(graph.nodes);
  
  // Create a dropdown
  var catMenu = d3.select("#catdropdown")
​
    catMenu
    .append("select")
        .selectAll("option")
        .data(nodesByGroup)
      .enter()
      .append("option")
      .attr("value", function(d){
          return d.key;
      })
        .text(function(d){
            return d.key;
        })
  
  var link = svg.append("g")
      .attr("class", "links")
    .selectAll("line")
    //.data(graph.links)
    .data(currLinks)
    .enter().append("line");
​
  var node = svg.append("g")
      .attr("class", "nodes")
    .selectAll("circle")
    //.data(graph.nodes)
    .data(currNodes)
    .enter().append("circle")
      .attr("r", 2.5)
        .attr("fill", function(d) { return color(d.group);})
      .call(d3.drag()
          .on("start", dragstarted)
          .on("drag", dragged)
          .on("end", dragended));
​
  node.append("title")
      .text(function(d) { return d.id; });
​
  node.append("text")
    .attr("dx", 12)
    .attr("dy", ".35em")
    .text(function(d) {return d.id;})
  
  simulation
      //.nodes(graph.nodes)
        .nodes(currNodes)
      .on("tick", ticked);
​
  simulation.force("link")
      .links(graph.links);
​
  
  
  function ticked() {
    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; });
  }
  
    // Run update function when dropdown selection changes
    catMenu.on('change', function(){
        // Find which fruit was selected from the dropdown
        var selectedGroup = d3.select(this)
                              .select("select")
                                .property("value");
    // Run update function with the selected fruit
        currNodes = filterNodes(selectedGroup);
    });
  
  function filterNodes(group) {
    //console.log(nodesByGroup);
    var filteredNodes = nodesByGroup.filter(function(d){
                            return d.key == group;
                            });
      console.log(filteredNodes);
    console.log(filteredNodes.values);
    return filteredNodes.values;
    //alert("Submit Button Clicked!");
  //console.log(document.getElementById('Group'))
  //var order = document.getElementById('group').value; 
  //alert(order)
}
  
  
  
});
​
  
​
  
  
function dragstarted(d) {
  if (!d3.event.active) simulation.alphaTarget(0.3).restart();
  d.fx = d.x;
  d.fy = d.y;
}
​
function dragged(d) {
  d.fx = d3.event.x;
  d.fy = d3.event.y;
}
​
function dragended(d) {
  if (!d3.event.active) simulation.alphaTarget(0);
  d.fx = null;
  d.fy = null;
}
​
</script>
​
    