D3 js Drag and Drop Zoomable Tree. Zoomable, Panning, Collapsible Tree with Auto-sizing.
Below you can see an example of a D3.js Drag and Drop Zoomable Tree which is collapsible, panning and auto-sizing.
I recently had a need for this functionality for a project and was unable to find any previous examples of such on the internet. Using the awesome D3.js library by Mike Bostock, I was able to get exactly what I needed with a bit of trial and error. Here I open up my efforts for others to leverage. It is certainly a visually pleasing and nifty tool. You can theme it with CSS as you would anything else.
This example pulls together various examples of work with trees in D3.js.
The panning functionality can certainly be improved in my opinion and I would be thrilled to see better solutions contributed.
One can do all manner of housekeeping or server related calls on the drop event to manage a remote tree dataset for example. However here I simply append any dropped node as a child to the node being dropped upon.
Dragging can be performed on any node other than root (flare). Dropping can be done on any node.
Panning can either be done by dragging an empty part of the SVG around or dragging a node towards an edge.
Zooming is performed by either double clicking on an empty part of the SVG or by scrolling the mouse-wheel. To Zoom out hold shift when double-clicking.
Expanding and collapsing of nodes is achieved by clicking on the desired node.
The tree auto-calculates its sizes both horizontally and vertically so it can adapt between many nodes being present in the view to very few whilst making the view manageable and pleasing on the eye.
The source code can be found here: https://gist.github.com/robschmuecker/7880033
And an example of it working with code in the same view is here:- http://bl.ocks.org/robschmuecker/7880033
The main source code excluding jQuery as a helper for getting element sizes (used only once) and the D3.js library can be found below as javascript:
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/* Copyright (c) 2013-2016, Rob Schmuecker All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * The name Rob Schmuecker may not be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MICHAEL BOSTOCK BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ // Get JSON data treeJSON = d3.json("flare.json", function(error, treeData) { // Calculate total nodes, max label length var totalNodes = 0; var maxLabelLength = 0; // variables for drag/drop var selectedNode = null; var draggingNode = null; // panning variables var panSpeed = 200; var panBoundary = 20; // Within 20px from edges will pan when dragging. // Misc. variables var i = 0; var duration = 750; var root; // size of the diagram var viewerWidth = $(document).width(); var viewerHeight = $(document).height(); var tree = d3.layout.tree() .size([viewerHeight, viewerWidth]); // define a d3 diagonal projection for use by the node paths later on. var diagonal = d3.svg.diagonal() .projection(function(d) { return [d.y, d.x]; }); // A recursive helper function for performing some setup by walking through all nodes function visit(parent, visitFn, childrenFn) { if (!parent) return; visitFn(parent); var children = childrenFn(parent); if (children) { var count = children.length; for (var i = 0; i < count; i++) { visit(children[i], visitFn, childrenFn); } } } // Call visit function to establish maxLabelLength visit(treeData, function(d) { totalNodes++; maxLabelLength = Math.max(d.name.length, maxLabelLength); }, function(d) { return d.children && d.children.length > 0 ? d.children : null; }); // sort the tree according to the node names function sortTree() { tree.sort(function(a, b) { return b.name.toLowerCase() < a.name.toLowerCase() ? 1 : -1; }); } // Sort the tree initially incase the JSON isn't in a sorted order. sortTree(); // TODO: Pan function, can be better implemented. function pan(domNode, direction) { var speed = panSpeed; if (panTimer) { clearTimeout(panTimer); translateCoords = d3.transform(svgGroup.attr("transform")); if (direction == 'left' || direction == 'right') { translateX = direction == 'left' ? translateCoords.translate[0] + speed : translateCoords.translate[0] - speed; translateY = translateCoords.translate[1]; } else if (direction == 'up' || direction == 'down') { translateX = translateCoords.translate[0]; translateY = direction == 'up' ? translateCoords.translate[1] + speed : translateCoords.translate[1] - speed; } scaleX = translateCoords.scale[0]; scaleY = translateCoords.scale[1]; scale = zoomListener.scale(); svgGroup.transition().attr("transform", "translate(" + translateX + "," + translateY + ")scale(" + scale + ")"); d3.select(domNode).select('g.node').attr("transform", "translate(" + translateX + "," + translateY + ")"); zoomListener.scale(zoomListener.scale()); zoomListener.translate([translateX, translateY]); panTimer = setTimeout(function() { pan(domNode, speed, direction); }, 50); } } // Define the zoom function for the zoomable tree function zoom() { svgGroup.attr("transform", "translate(" + d3.event.translate + ")scale(" + d3.event.scale + ")"); } // define the zoomListener which calls the zoom function on the "zoom" event constrained within the scaleExtents var zoomListener = d3.behavior.zoom().scaleExtent([0.1, 3]).on("zoom", zoom); function initiateDrag(d, domNode) { draggingNode = d; d3.select(domNode).select('.ghostCircle').attr('pointer-events', 'none'); d3.selectAll('.ghostCircle').attr('class', 'ghostCircle show'); d3.select(domNode).attr('class', 'node activeDrag'); svgGroup.selectAll("g.node").sort(function(a, b) { // select the parent and sort the path's if (a.id != draggingNode.id) return 1; // a is not the hovered element, send "a" to the back else return -1; // a is the hovered element, bring "a" to the front }); // if nodes has children, remove the links and nodes if (nodes.length > 1) { // remove link paths links = tree.links(nodes); nodePaths = svgGroup.selectAll("path.link") .data(links, function(d) { return d.target.id; }).remove(); // remove child nodes nodesExit = svgGroup.selectAll("g.node") .data(nodes, function(d) { return d.id; }).filter(function(d, i) { if (d.id == draggingNode.id) { return false; } return true; }).remove(); } // remove parent link parentLink = tree.links(tree.nodes(draggingNode.parent)); svgGroup.selectAll('path.link').filter(function(d, i) { if (d.target.id == draggingNode.id) { return true; } return false; }).remove(); dragStarted = null; } // define the baseSvg, attaching a class for styling and the zoomListener var baseSvg = d3.select("#tree-container").append("svg") .attr("width", viewerWidth) .attr("height", viewerHeight) .attr("class", "overlay") .call(zoomListener); // Define the drag listeners for drag/drop behaviour of nodes. dragListener = d3.behavior.drag() .on("dragstart", function(d) { if (d == root) { return; } dragStarted = true; nodes = tree.nodes(d); d3.event.sourceEvent.stopPropagation(); // it's important that we suppress the mouseover event on the node being dragged. Otherwise it will absorb the mouseover event and the underlying node will not detect it d3.select(this).attr('pointer-events', 'none'); }) .on("drag", function(d) { if (d == root) { return; } if (dragStarted) { domNode = this; initiateDrag(d, domNode); } // get coords of mouseEvent relative to svg container to allow for panning relCoords = d3.mouse($('svg').get(0)); if (relCoords[0] < panBoundary) { panTimer = true; pan(this, 'left'); } else if (relCoords[0] > ($('svg').width() - panBoundary)) { panTimer = true; pan(this, 'right'); } else if (relCoords[1] < panBoundary) { panTimer = true; pan(this, 'up'); } else if (relCoords[1] > ($('svg').height() - panBoundary)) { panTimer = true; pan(this, 'down'); } else { try { clearTimeout(panTimer); } catch (e) { } } d.x0 += d3.event.dy; d.y0 += d3.event.dx; var node = d3.select(this); node.attr("transform", "translate(" + d.y0 + "," + d.x0 + ")"); updateTempConnector(); }).on("dragend", function(d) { if (d == root) { return; } domNode = this; if (selectedNode) { // now remove the element from the parent, and insert it into the new elements children var index = draggingNode.parent.children.indexOf(draggingNode); if (index > -1) { draggingNode.parent.children.splice(index, 1); } if (typeof selectedNode.children !== 'undefined' || typeof selectedNode._children !== 'undefined') { if (typeof selectedNode.children !== 'undefined') { selectedNode.children.push(draggingNode); } else { selectedNode._children.push(draggingNode); } } else { selectedNode.children = []; selectedNode.children.push(draggingNode); } // Make sure that the node being added to is expanded so user can see added node is correctly moved expand(selectedNode); sortTree(); endDrag(); } else { endDrag(); } }); function endDrag() { selectedNode = null; d3.selectAll('.ghostCircle').attr('class', 'ghostCircle'); d3.select(domNode).attr('class', 'node'); // now restore the mouseover event or we won't be able to drag a 2nd time d3.select(domNode).select('.ghostCircle').attr('pointer-events', ''); updateTempConnector(); if (draggingNode !== null) { update(root); centerNode(draggingNode); draggingNode = null; } } // Helper functions for collapsing and expanding nodes. function collapse(d) { if (d.children) { d._children = d.children; d._children.forEach(collapse); d.children = null; } } function expand(d) { if (d._children) { d.children = d._children; d.children.forEach(expand); d._children = null; } } var overCircle = function(d) { selectedNode = d; updateTempConnector(); }; var outCircle = function(d) { selectedNode = null; updateTempConnector(); }; // Function to update the temporary connector indicating dragging affiliation var updateTempConnector = function() { var data = []; if (draggingNode !== null && selectedNode !== null) { // have to flip the source coordinates since we did this for the existing connectors on the original tree data = [{ source: { x: selectedNode.y0, y: selectedNode.x0 }, target: { x: draggingNode.y0, y: draggingNode.x0 } }]; } var link = svgGroup.selectAll(".templink").data(data); link.enter().append("path") .attr("class", "templink") .attr("d", d3.svg.diagonal()) .attr('pointer-events', 'none'); link.attr("d", d3.svg.diagonal()); link.exit().remove(); }; // Function to center node when clicked/dropped so node doesn't get lost when collapsing/moving with large amount of children. function centerNode(source) { scale = zoomListener.scale(); x = -source.y0; y = -source.x0; x = x * scale + viewerWidth / 2; y = y * scale + viewerHeight / 2; d3.select('g').transition() .duration(duration) .attr("transform", "translate(" + x + "," + y + ")scale(" + scale + ")"); zoomListener.scale(scale); zoomListener.translate([x, y]); } // Toggle children function function toggleChildren(d) { if (d.children) { d._children = d.children; d.children = null; } else if (d._children) { d.children = d._children; d._children = null; } return d; } // Toggle children on click. function click(d) { if (d3.event.defaultPrevented) return; // click suppressed d = toggleChildren(d); update(d); centerNode(d); } function update(source) { // Compute the new height, function counts total children of root node and sets tree height accordingly. // This prevents the layout looking squashed when new nodes are made visible or looking sparse when nodes are removed // This makes the layout more consistent. var levelWidth = [1]; var childCount = function(level, n) { if (n.children && n.children.length > 0) { if (levelWidth.length <= level + 1) levelWidth.push(0); levelWidth[level + 1] += n.children.length; n.children.forEach(function(d) { childCount(level + 1, d); }); } }; childCount(0, root); var newHeight = d3.max(levelWidth) * 25; // 25 pixels per line tree = tree.size([newHeight, viewerWidth]); // Compute the new tree layout. var nodes = tree.nodes(root).reverse(), links = tree.links(nodes); // Set widths between levels based on maxLabelLength. nodes.forEach(function(d) { d.y = (d.depth * (maxLabelLength * 10)); //maxLabelLength * 10px // alternatively to keep a fixed scale one can set a fixed depth per level // Normalize for fixed-depth by commenting out below line // d.y = (d.depth * 500); //500px per level. }); // Update the nodes… node = svgGroup.selectAll("g.node") .data(nodes, function(d) { return d.id || (d.id = ++i); }); // Enter any new nodes at the parent's previous position. var nodeEnter = node.enter().append("g") .call(dragListener) .attr("class", "node") .attr("transform", function(d) { return "translate(" + source.y0 + "," + source.x0 + ")"; }) .on('click', click); nodeEnter.append("circle") .attr('class', 'nodeCircle') .attr("r", 0) .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; }); nodeEnter.append("text") .attr("x", function(d) { return d.children || d._children ? -10 : 10; }) .attr("dy", ".35em") .attr('class', 'nodeText') .attr("text-anchor", function(d) { return d.children || d._children ? "end" : "start"; }) .text(function(d) { return d.name; }) .style("fill-opacity", 0); // phantom node to give us mouseover in a radius around it nodeEnter.append("circle") .attr('class', 'ghostCircle') .attr("r", 30) .attr("opacity", 0.2) // change this to zero to hide the target area .style("fill", "red") .attr('pointer-events', 'mouseover') .on("mouseover", function(node) { overCircle(node); }) .on("mouseout", function(node) { outCircle(node); }); // Update the text to reflect whether node has children or not. node.select('text') .attr("x", function(d) { return d.children || d._children ? -10 : 10; }) .attr("text-anchor", function(d) { return d.children || d._children ? "end" : "start"; }) .text(function(d) { return d.name; }); // Change the circle fill depending on whether it has children and is collapsed node.select("circle.nodeCircle") .attr("r", 4.5) .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; }); // Transition nodes to their new position. var nodeUpdate = node.transition() .duration(duration) .attr("transform", function(d) { return "translate(" + d.y + "," + d.x + ")"; }); // Fade the text in nodeUpdate.select("text") .style("fill-opacity", 1); // Transition exiting nodes to the parent's new position. var nodeExit = node.exit().transition() .duration(duration) .attr("transform", function(d) { return "translate(" + source.y + "," + source.x + ")"; }) .remove(); nodeExit.select("circle") .attr("r", 0); nodeExit.select("text") .style("fill-opacity", 0); // Update the links… var link = svgGroup.selectAll("path.link") .data(links, function(d) { return d.target.id; }); // Enter any new links at the parent's previous position. link.enter().insert("path", "g") .attr("class", "link") .attr("d", function(d) { var o = { x: source.x0, y: source.y0 }; return diagonal({ source: o, target: o }); }); // Transition links to their new position. link.transition() .duration(duration) .attr("d", diagonal); // Transition exiting nodes to the parent's new position. link.exit().transition() .duration(duration) .attr("d", function(d) { var o = { x: source.x, y: source.y }; return diagonal({ source: o, target: o }); }) .remove(); // Stash the old positions for transition. nodes.forEach(function(d) { d.x0 = d.x; d.y0 = d.y; }); } // Append a group which holds all nodes and which the zoom Listener can act upon. var svgGroup = baseSvg.append("g"); // Define the root root = treeData; root.x0 = viewerHeight / 2; root.y0 = 0; // Layout the tree initially and center on the root node. update(root); centerNode(root); }); |
Below is the CSS used in the example above
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.node { cursor: pointer; } .overlay{ background-color:#EEE; } .node circle { fill: #fff; stroke: steelblue; stroke-width: 1.5px; } .node text { font-size:10px; font-family:sans-serif; } .link { fill: none; stroke: #ccc; stroke-width: 1.5px; } .templink { fill: none; stroke: red; stroke-width: 3px; } .ghostCircle.show{ display:block; } .ghostCircle, .activeDrag .ghostCircle{ display: none; } |
I hope it can help others looking for a similar tool.
R.
Edit 14/10/2015
A kind lady by the name of Irina Papuc contacted me from Toptal.com she found this article and suggested that I perhaps be so kind to let all my kind good readers know about their blog. So in a show of good faith – here my dears is the Toptal Blog with another nice D3.js article http://www.toptal.com/javascript/a-map-to-perfection-using-d3-js-to-make-beautiful-web-maps Happy D3’ing. R.