denisemauldin/Filtering Nodes

## README.md

      
    Raw
  

              README.md
            
          
    This simple interaction demonstrates how to filter nodes (and their respective links) in a Force-Directed Graph using D3.js version 4. It follows the new General Update Pattern in order to add and remove elements as needed.

  
## blocks-data.json
 {
 	"nodes": [
 		{ "id": "0", "group": "1" },
 		{ "id": "1", "group": "2" },
 		{ "id": "2", "group": "2" },
 		{ "id": "3", "group": "2" },
 		{ "id": "4", "group": "2" },
 		{ "id": "5", "group": "3" },
 		{ "id": "6", "group": "3" },
 		{ "id": "7", "group": "3" },
 		{ "id": "8", "group": "3" }
 	],
 	"links1": [
 		{ "source": "0", "target": "1", "id": "0"},
 		{ "source": "0", "target": "2", "id": "1"},
 		{ "source": "0", "target": "3", "id": "2"},
 		{ "source": "0", "target": "4", "id": "3"},
 		{ "source": "1", "target": "5", "id": "4"},
 		{ "source": "2", "target": "6", "id": "5"},
 		{ "source": "3", "target": "7", "id": "6"},
 		{ "source": "4", "target": "8", "id": "7"},
 		{ "source": "1", "target": "8", "id": "8"},
 		{ "source": "2", "target": "5", "id": "9"},
 		{ "source": "3", "target": "6", "id": "10"},
 		{ "source": "4", "target": "7", "id": "11"}
 	]
 }

## Filtering Nodes
Click to view more!

## index.html
<!DOCTYPE html>
<html>
<meta charset="UTF-8">
<style>
/*	style definitions	*/
button {
  position: absolute;
}

#blue {
  top: 1em;
  left: 1em;
}

#orange {
  top: 1em;
  left: 8em;
}

#green {
  top: 1em;
  left: 16em;
}

.node {
	stroke: white;
	stroke-width: 2px;
}

.link {
	stroke: gray;
	stroke-width: 4px;
}

</style>
<button type="button" class="filter-btn" id="blue" value="1">Filter Blue</button>
<button type="button" class="filter-btn" id="orange" value="2">Filter Orange</button>
<button type="button" class="filter-btn" id="green" value="3">Filter Green</button>
<svg width="960" height="500"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script
  src="https://code.jquery.com/jquery-3.2.1.min.js"
  integrity="sha256-hwg4gsxgFZhOsEEamdOYGBf13FyQuiTwlAQgxVSNgt4="
  crossorigin="anonymous"></script>
<script>

//	data stores
var graph, store;

//	svg selection and sizing
var svg = d3.select("svg"),
    width = +svg.attr("width"),
    height = +svg.attr("height"),
    radius = 10;

//	d3 color scales
var color = d3.scaleOrdinal(d3.schemeCategory10);

var link = svg.append("g").selectAll(".link"),
	node = svg.append("g").selectAll(".node");

//	force simulation initialization
var simulation = d3.forceSimulation()
	.force("link", d3.forceLink()
		.id(function(d) { return d.id; }))
	.force("charge", d3.forceManyBody()
		.strength(function(d) { return -500;}))
	.force("center", d3.forceCenter(width / 2, height / 2));

//	filtered types
typeFilterList = [];

//	filter button event handlers
$(".filter-btn").on("click", function() {
	var id = $(this).attr("value");
	if (typeFilterList.includes(id)) {
		typeFilterList.splice(typeFilterList.indexOf(id), 1)
	} else {
		typeFilterList.push(id);
	}
	filter();
	update();
});

//	data read and store
d3.json("blocks-data.json", function(err, g) {
	if (err) throw err;

	var nodeByID = {};

	g.nodes.forEach(function(n) {
		nodeByID[n.id] = n;
	});

	g.links1.forEach(function(l) {
		l.sourceGroup = nodeByID[l.source].group.toString();
		l.targetGroup = nodeByID[l.target].group.toString();
	});

	graph = g;
	store = $.extend(true, {}, g);

	update();
});

//	general update pattern for updating the graph
function update() {
	//	UPDATE
	node = node.data(graph.nodes, function(d) { return d.id;});
	//	EXIT
	node.exit().remove();
	//	ENTER
	var newNode = node.enter().append("circle")
		.attr("class", "node")
		.attr("r", radius)
		.attr("fill", function(d) {return color(d.group);})
		.call(d3.drag()
          .on("start", dragstarted)
          .on("drag", dragged)
          .on("end", dragended)
        )

    newNode.append("title")
      .text(function(d) { return "group: " + d.group + "\n" + "id: " + d.id; });
	//	ENTER + UPDATE
	node = node.merge(newNode);

	//	UPDATE
	link = link.data(graph.links1, function(d) { return d.id;});
	//	EXIT
	link.exit().remove();
	//	ENTER
	newLink = link.enter().append("line")
		.attr("class", "link");

	newLink.append("title")
      .text(function(d) { return "source: " + d.source + "\n" + "target: " + d.target; });
	//	ENTER + UPDATE
	link = link.merge(newLink);

	//	update simulation nodes, links, and alpha
	simulation
		.nodes(graph.nodes)
		.on("tick", ticked);

  	simulation.force("link")
  		.links(graph.links1);

  	simulation.alpha(1).alphaTarget(0).restart();
}

//	drag event handlers
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;
}

//	tick event handler with bounded box
function ticked() {
	node
		.attr("cx", function(d) { return d.x = Math.max(radius, Math.min(width - radius, d.x)); })
		.attr("cy", function(d) { return d.y = Math.max(radius, Math.min(height - radius, d.y)); });

	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; });
}

//	filter function
function filter() {
	//	add and remove nodes from data based on type filters
	store.nodes.forEach(function(n) {
		if (!typeFilterList.includes(n.group) && n.filtered) {
			n.filtered = false;
			graph.nodes.push($.extend(true, {}, n));
		} else if (typeFilterList.includes(n.group) && !n.filtered) {
			n.filtered = true;
			graph.nodes.forEach(function(d, i) {
				if (n.id === d.id) {
					graph.nodes.splice(i, 1);
				}
			});
		}
	});

	//	add and remove links from data based on availability of nodes
	store.links1.forEach(function(l) {
		if (!(typeFilterList.includes(l.sourceGroup) || typeFilterList.includes(l.targetGroup)) && l.filtered) {
			l.filtered = false;
			graph.links1.push($.extend(true, {}, l));
		} else if ((typeFilterList.includes(l.sourceGroup) || typeFilterList.includes(l.targetGroup)) && !l.filtered) {
			l.filtered = true;
			graph.links1.forEach(function(d, i) {
				if (l.id === d.id) {
					graph.links1.splice(i, 1);
				}
			});
		}
	});
}

</script>

## preview.png

      
    Raw
  

              preview.png
            
          
## thumbnail.png

      
    Raw
  

              thumbnail.png
	{
	"nodes": [
	{ "id": "0", "group": "1" },
	{ "id": "1", "group": "2" },
	{ "id": "2", "group": "2" },
	{ "id": "3", "group": "2" },
	{ "id": "4", "group": "2" },
	{ "id": "5", "group": "3" },
	{ "id": "6", "group": "3" },
	{ "id": "7", "group": "3" },
	{ "id": "8", "group": "3" }
	],
	"links1": [
	{ "source": "0", "target": "1", "id": "0"},
	{ "source": "0", "target": "2", "id": "1"},
	{ "source": "0", "target": "3", "id": "2"},
	{ "source": "0", "target": "4", "id": "3"},
	{ "source": "1", "target": "5", "id": "4"},
	{ "source": "2", "target": "6", "id": "5"},
	{ "source": "3", "target": "7", "id": "6"},
	{ "source": "4", "target": "8", "id": "7"},
	{ "source": "1", "target": "8", "id": "8"},
	{ "source": "2", "target": "5", "id": "9"},
	{ "source": "3", "target": "6", "id": "10"},
	{ "source": "4", "target": "7", "id": "11"}
	]
	}
	<!DOCTYPE html>
	<html>
	<meta charset="UTF-8">
	<style>
	/* style definitions */
	button {
	position: absolute;
	}

	#blue {
	top: 1em;
	left: 1em;
	}

	#orange {
	top: 1em;
	left: 8em;
	}

	#green {
	top: 1em;
	left: 16em;
	}

	.node {
	stroke: white;
	stroke-width: 2px;
	}

	.link {
	stroke: gray;
	stroke-width: 4px;
	}

	</style>
	<button type="button" class="filter-btn" id="blue" value="1">Filter Blue</button>
	<button type="button" class="filter-btn" id="orange" value="2">Filter Orange</button>
	<button type="button" class="filter-btn" id="green" value="3">Filter Green</button>
	<svg width="960" height="500"></svg>
	<script src="https://d3js.org/d3.v4.min.js"></script>
	<script
	src="https://code.jquery.com/jquery-3.2.1.min.js"
	integrity="sha256-hwg4gsxgFZhOsEEamdOYGBf13FyQuiTwlAQgxVSNgt4="
	crossorigin="anonymous"></script>
	<script>

	// data stores
	var graph, store;

	// svg selection and sizing
	var svg = d3.select("svg"),
	width = +svg.attr("width"),
	height = +svg.attr("height"),
	radius = 10;

	// d3 color scales
	var color = d3.scaleOrdinal(d3.schemeCategory10);

	var link = svg.append("g").selectAll(".link"),
	node = svg.append("g").selectAll(".node");

	// force simulation initialization
	var simulation = d3.forceSimulation()
	.force("link", d3.forceLink()
	.id(function(d) { return d.id; }))
	.force("charge", d3.forceManyBody()
	.strength(function(d) { return -500;}))
	.force("center", d3.forceCenter(width / 2, height / 2));

	// filtered types
	typeFilterList = [];

	// filter button event handlers
	$(".filter-btn").on("click", function() {
	var id = $(this).attr("value");
	if (typeFilterList.includes(id)) {
	typeFilterList.splice(typeFilterList.indexOf(id), 1)
	} else {
	typeFilterList.push(id);
	}
	filter();
	update();
	});

	// data read and store
	d3.json("blocks-data.json", function(err, g) {
	if (err) throw err;

	var nodeByID = {};

	g.nodes.forEach(function(n) {
	nodeByID[n.id] = n;
	});

	g.links1.forEach(function(l) {
	l.sourceGroup = nodeByID[l.source].group.toString();
	l.targetGroup = nodeByID[l.target].group.toString();
	});

	graph = g;
	store = $.extend(true, {}, g);

	update();
	});

	// general update pattern for updating the graph
	function update() {
	// UPDATE
	node = node.data(graph.nodes, function(d) { return d.id;});
	// EXIT
	node.exit().remove();
	// ENTER
	var newNode = node.enter().append("circle")
	.attr("class", "node")
	.attr("r", radius)
	.attr("fill", function(d) {return color(d.group);})
	.call(d3.drag()
	.on("start", dragstarted)
	.on("drag", dragged)
	.on("end", dragended)
	)

	newNode.append("title")
	.text(function(d) { return "group: " + d.group + "\n" + "id: " + d.id; });
	// ENTER + UPDATE
	node = node.merge(newNode);

	// UPDATE
	link = link.data(graph.links1, function(d) { return d.id;});
	// EXIT
	link.exit().remove();
	// ENTER
	newLink = link.enter().append("line")
	.attr("class", "link");

	newLink.append("title")
	.text(function(d) { return "source: " + d.source + "\n" + "target: " + d.target; });
	// ENTER + UPDATE
	link = link.merge(newLink);

	// update simulation nodes, links, and alpha
	simulation
	.nodes(graph.nodes)
	.on("tick", ticked);

	simulation.force("link")
	.links(graph.links1);

	simulation.alpha(1).alphaTarget(0).restart();
	}

	// drag event handlers
	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;
	}

	// tick event handler with bounded box
	function ticked() {
	node
	.attr("cx", function(d) { return d.x = Math.max(radius, Math.min(width - radius, d.x)); })
	.attr("cy", function(d) { return d.y = Math.max(radius, Math.min(height - radius, d.y)); });

	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; });
	}

	// filter function
	function filter() {
	// add and remove nodes from data based on type filters
	store.nodes.forEach(function(n) {
	if (!typeFilterList.includes(n.group) && n.filtered) {
	n.filtered = false;
	graph.nodes.push($.extend(true, {}, n));
	} else if (typeFilterList.includes(n.group) && !n.filtered) {
	n.filtered = true;
	graph.nodes.forEach(function(d, i) {
	if (n.id === d.id) {
	graph.nodes.splice(i, 1);
	}
	});
	}
	});

	// add and remove links from data based on availability of nodes
	store.links1.forEach(function(l) {
	if (!(typeFilterList.includes(l.sourceGroup) \|\| typeFilterList.includes(l.targetGroup)) && l.filtered) {
	l.filtered = false;
	graph.links1.push($.extend(true, {}, l));
	} else if ((typeFilterList.includes(l.sourceGroup) \|\| typeFilterList.includes(l.targetGroup)) && !l.filtered) {
	l.filtered = true;
	graph.links1.forEach(function(d, i) {
	if (l.id === d.id) {
	graph.links1.splice(i, 1);
	}
	});
	}
	});
	}

	</script>