A Pen by Eleftheria Batsou on CodePen.
Created
October 1, 2019 19:16
-
-
Save baddot/1711205e7c3b7cde6d881d64fe68a7e4 to your computer and use it in GitHub Desktop.
Tree Layout - D3js V5
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
<meta charset="UTF-8"> | |
<style> | |
.node circle { | |
fill: #fff; | |
stroke: steelblue; | |
stroke-width: 3px; | |
} | |
.node text { | |
font: 12px sans-serif; | |
} | |
.link { | |
fill: none; | |
stroke: #ccc; | |
stroke-width: 2px; | |
} | |
</style> | |
<body> | |
<div class="text-center" id="footer"> <!-- for footer --> | |
<div> | |
<h5><a href="http://www.eleftheriabatsou.com" target="_blank">Eleftheria</a> | <a href="https://codepen.io/EleftheriaBatsou" target="_blank">Projects</a> | <a href="https://www.youtube.com/channel/UCC-WwYv3DEW7Nkm_IP6VeQQ" target="_blank"> Coding videos </a></h5> | |
</div> | |
</div> <!-- end footer --> | |
<hr> | |
You can find this example <a href="https://bl.ocks.org/d3noob/43a860bc0024792f8803bba8ca0d5ecd" target="_blank" >here</a>. <br> | |
Or find out more details in <a href="http://www.d3noob.org/2014/01/tree-diagrams-in-d3js_11.html" target="_blank">this</a> article.<br> | |
And watch this (outdated) <a href="https://www.youtube.com/watch?v=x8dwXoWODZ4" target="_blank">video</a>. | |
<!-- load the d3.js library --> | |
<script src="https://d3js.org/d3.v5.min.js"></script> | |
<script> | |
var treeData = | |
{ | |
"name": "Top Level", | |
"children": [ | |
{ | |
"name": "Level 2: A", | |
"children": [ | |
{ "name": "Son of A" }, | |
{ "name": "Daughter of A" } | |
] | |
}, | |
{ "name": "Level 2: B" } | |
] | |
}; | |
// Set the dimensions and margins of the diagram | |
var margin = {top: 20, right: 90, bottom: 30, left: 90}, | |
width = 960 - margin.left - margin.right, | |
height = 500 - margin.top - margin.bottom; | |
// append the svg object to the body of the page | |
// appends a 'group' element to 'svg' | |
// moves the 'group' element to the top left margin | |
var svg = d3.select("body").append("svg") | |
.attr("width", width + margin.right + margin.left) | |
.attr("height", height + margin.top + margin.bottom) | |
.append("g") | |
.attr("transform", "translate(" | |
+ margin.left + "," + margin.top + ")"); | |
var i = 0, | |
duration = 750, | |
root; | |
// declares a tree layout and assigns the size | |
var treemap = d3.tree().size([height, width]); | |
// Assigns parent, children, height, depth | |
root = d3.hierarchy(treeData, function(d) { return d.children; }); | |
root.x0 = height / 2; | |
root.y0 = 0; | |
// Collapse after the second level | |
//root.children.forEach(collapse); | |
update(root); | |
// Collapse the node and all it's children | |
// function collapse(d) { | |
// if(d.children) { | |
// d._children = d.children | |
// d._children.forEach(collapse) | |
// d.children = null | |
// } | |
// } | |
function update(source) { | |
// Assigns the x and y position for the nodes | |
var treeData = treemap(root); | |
// Compute the new tree layout. | |
var nodes = treeData.descendants(), | |
links = treeData.descendants().slice(1); | |
// Normalize for fixed-depth. | |
nodes.forEach(function(d){ d.y = d.depth * 180}); | |
// ****************** Nodes section *************************** | |
// Update the nodes... | |
var node = svg.selectAll('g.node') | |
.data(nodes, function(d) {return d.id || (d.id = ++i); }); | |
// Enter any new modes at the parent's previous position. | |
var nodeEnter = node.enter().append('g') | |
.attr('class', 'node') | |
.attr("transform", function(d) { | |
return "translate(" + source.y0 + "," + source.x0 + ")"; | |
}) | |
.on('click', click); | |
// Add Circle for the nodes | |
nodeEnter.append('circle') | |
.attr('class', 'node') | |
.attr('r', 1e-6) | |
.style("fill", function(d) { | |
return d._children ? "lightsteelblue" : "#fff"; | |
}); | |
// Add labels for the nodes | |
nodeEnter.append('text') | |
.attr("dy", ".35em") | |
.attr("x", function(d) { | |
return d.children || d._children ? -13 : 13; | |
}) | |
.attr("text-anchor", function(d) { | |
return d.children || d._children ? "end" : "start"; | |
}) | |
.text(function(d) { return d.data.name; }); | |
// UPDATE | |
var nodeUpdate = nodeEnter.merge(node); | |
// Transition to the proper position for the node | |
nodeUpdate.transition() | |
.duration(duration) | |
.attr("transform", function(d) { | |
return "translate(" + d.y + "," + d.x + ")"; | |
}); | |
// Update the node attributes and style | |
nodeUpdate.select('circle.node') | |
.attr('r', 10) | |
.style("fill", function(d) { | |
return d._children ? "lightsteelblue" : "#fff"; | |
}) | |
.attr('cursor', 'pointer'); | |
// Remove any exiting nodes | |
var nodeExit = node.exit().transition() | |
.duration(duration) | |
.attr("transform", function(d) { | |
return "translate(" + source.y + "," + source.x + ")"; | |
}) | |
.remove(); | |
// On exit reduce the node circles size to 0 | |
nodeExit.select('circle') | |
.attr('r', 1e-6); | |
// On exit reduce the opacity of text labels | |
nodeExit.select('text') | |
.style('fill-opacity', 1e-6); | |
// ****************** links section *************************** | |
// Update the links... | |
var link = svg.selectAll('path.link') | |
.data(links, function(d) { return d.id; }); | |
// Enter any new links at the parent's previous position. | |
var linkEnter = link.enter().insert('path', "g") | |
.attr("class", "link") | |
.attr('d', function(d){ | |
var o = {x: source.x0, y: source.y0} | |
return diagonal(o, o) | |
}); | |
// UPDATE | |
var linkUpdate = linkEnter.merge(link); | |
// Transition back to the parent element position | |
linkUpdate.transition() | |
.duration(duration) | |
.attr('d', function(d){ return diagonal(d, d.parent) }); | |
// Remove any exiting links | |
var linkExit = link.exit().transition() | |
.duration(duration) | |
.attr('d', function(d) { | |
var o = {x: source.x, y: source.y} | |
return diagonal(o, o) | |
}) | |
.remove(); | |
// Store the old positions for transition. | |
nodes.forEach(function(d){ | |
d.x0 = d.x; | |
d.y0 = d.y; | |
}); | |
// Creates a curved (diagonal) path from parent to the child nodes | |
function diagonal(s, d) { | |
path = `M ${s.y} ${s.x} | |
C ${(s.y + d.y) / 2} ${s.x}, | |
${(s.y + d.y) / 2} ${d.x}, | |
${d.y} ${d.x}` | |
return path | |
} | |
// Toggle children on click. | |
function click(d) { | |
if (d.children) { | |
d._children = d.children; | |
d.children = null; | |
} else { | |
d.children = d._children; | |
d._children = null; | |
} | |
update(d); | |
} | |
} | |
</script> | |
</body> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment