Force Layout v4 with Filters

D3 v4 forcelayout example with dropdown filters.

forked from mbostock's block: Force Dragging I

<!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>

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);

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>

https://d3js.org/d3.v4.min.js