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POWhy are new nodes in a D3 force directed graph not showing up consistently?
 

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  1. POWhy are new nodes in a D3 force directed graph not showing up consistently?
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    <p>I've been working with d3 for a while now in an attempt to create an interactive ecosystem explorer tool that maps out relationships between species. Recently I've tried adding a feature that lets users show or hide species (nodes) in the force directed graph. I've tried following other examples and although the code works - it only works inconsistently. </p> <p>For some reason, when I add back a node, it sometimes isn't visible. The graph moves as if the node is added but then it doesn't show up. I have the feeling that it is adding it but then the node is being hidden again in the force.on("tick") code but have no idea why. I've posted the relevant code below and would really appreciate any ideas! The toggleNode function determines whether a node should be shown or hidden - basically just splicing or adding to the nodes array. I keep the data in an array called dataset that stores a flag to indicate whether a node is visible or not. </p> <pre><code>var force = d3.layout.force() .gravity(.05) .distance(100) .charge(-100) .size([w, h]); var nodes = force.nodes(), links = force.links(); // arrays to hold data var vis = d3.select("#chart").append("svg:svg") .attr("width", w) .attr("height", h); force.on("tick", function() { vis.selectAll("circle.node") .attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; }); vis.selectAll("line.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; }); }); function restart() { // UPDATE nodes var node = vis.selectAll("circle.node") .data(nodes, function(d) { return d.id;}); // ENTER new nodes var nodeEnter = node.enter().append("svg:circle") .attr("class", "node") .attr("cx", function(d) { return d.x; }) .attr("cy", function(d) { return d.y; }) .style("fill", function(d) { return groupColors[(d.group)-1]; }) .style("stroke","fff") .style("stroke-width",1) .on("mousedown", function(d) { clickNode(d); }) .call(force.drag); // REMOVE deleted nodes var nodeExit = node.exit().remove(); force.start(); } // Add the nodes and links to the vis function createVis(json) { dataset = json; // store data in global for (var i = 0; i &lt; dataset['nodes'].length; i++) { // fill node info nodes.push(dataset['nodes'][i]); } restart(); } // Remove node and associated links. function toggleNode(nodeKey,eol_id) { console.log(nodeKey + ': ' + eol_id); var tLabel; // value for toggle label if ( dataset['nodes'][nodeKey]['isHidden'] == 0 ) { // node is visible, so hide it tLabel = 'Show'; for( var k=0; k&lt;nodes.length; k++ ) { if ( nodes[k]['eol_id'] == eol_id ) { nodes.splice(k, 1); // remove this node break; } } dataset['nodes'][nodeKey]['isHidden'] = 1; console.log('node removed: ' + nodeKey); } else { dataset['nodes'][nodeKey]['isHidden'] = 0; nodes.push(dataset['nodes'][nodeKey]); tLabel = 'Hide'; } $('#primary_title_toggle').html('&amp;nbsp; &lt;a href="#" onclick="toggleNode(' + nodeKey + ',\'' + eol_id + '\')"&gt;' + tLabel + '&lt;/a&gt;&lt;br&gt;'); restart(); } </code></pre>
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    1. USpaxRoman
    1. USJHolmes
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      1. POWhy are new nodes in a D3 force directed graph not showing up consistently?
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    1. COIs it possible that I need to set the x,y coordinates for a node that is added back? Are these nodes not visible because they are being positioned off the visible graph?
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      1. POWhy are new nodes in a D3 force directed graph not showing up consistently?
      1. USJHolmes
    2. COin general what you say is true :) good luck! p.s. look at my posts and you can find some tricks related to force directed layouts
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      1. POWhy are new nodes in a D3 force directed graph not showing up consistently?
      1. USpaxRoman
    3. COI've done some more experimenting like examining the node's properties before and after it's hidden and then re-shown. Everything seems to be there and the x,y coords appear to be correct (that is, within the graph's visible scope). There's even a space in the graph where you'd expect to see the node but it's just not visible. I can use other nodes to push it around - confirmed when re-examining it's x,y coords. So I'm perplexed. Any ideas on how to make it visible again?
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      1. POWhy are new nodes in a D3 force directed graph not showing up consistently?
      1. USJHolmes
 

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