我想用D3从 csv表创建一个交互式可折叠的树图。
例如，csv可能如下所示：
name,parent
Level 2: A,Top Level
Top Level,null
Son of A,Level 2: A
Daughter of A,Level 2: A
Level 2: B,Top Level
我的想法是使用这些代码生成所需的代码。我使用了第一个代码，并在第二个代码中添加了几行以使用csv文件。但是，它不起作用。您对如何正确执行操作有任何想法吗？
谢谢。
这是我做的代码，不起作用（错误消息：“ d3.v4.min.js：2 Uncaught TypeError：t.eachBefore不是函数”）：< / p>
<!DOCTYPE html>
<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>
<!-- load the d3.js library -->
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
d3.csv("treedata.csv", function(error, data) {
// 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;
// declares a tree layout and assigns the size
var treemap = d3.tree().size([height, width]);
// Assigns parent, children, height, depth
// *********** Convert flat data into a nice tree ***************
// create a name: node map
var dataMap = data.reduce(function(map, node) {
map[node.name] = node;
return map;
}, {});
// create the tree array
var treeData = [];
data.forEach(function(node) {
// add to parent
var parent = dataMap[node.parent];
if (parent) {
// create child array if it doesn't exist
(parent.children || (parent.children = []))
// add node to child array
.push(node);
} else {
// parent is null or missing
treeData.push(node);
}
});
var root = treeData[0];
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>
答案 0 :(得分：1)
我写了下面的文章，它应该做你所需要的。如果没有，您可以根据需要进行调整：
function convertToJsonTree(lines) {
// create the base
let parent = {};
// iterate through the lines
for (let i = 0; i < lines.length; i++) {
let _s = lines[i].split(',');
let _name = _s[0];
let _parent = _s[1];
// if the parents name is null, we must be at the base
if (_parent === 'null') {
// set the name
parent.name = _name;
// get rid of the current line
delete lines[i];
let subLines = lines.filter(function(el) {
return el != null;
});
// check for the first set of children
for (let j = 0; j < subLines.length; j++) {
let __s = subLines[j].split(',');
let __name = __s[0];
let __parent = __s[1];
// if there's a child that has the current level as the parent
if (parent && parent.name === __parent) {
// if the children array is undefined, create an array
if (!parent.children)
parent.children = [];
// create the child
let child = {
name: __name
};
// add it to the parents children
parent.children.push(child);
// remove the line that was already checked
delete subLines[j];
let _subLines = subLines.filter(function(el) {
return el != null;
});
// check if the child has any children
getChildren(child, _subLines);
}
}
}
}
return parent;
}
function getChildren(parent, lines) {
for (let i = 0; i < lines.length; i++) {
let _s = lines[i].split(',');
let _name = _s[0];
let _parent = _s[1];
// if there's a child that has the current level as the parent
if (parent && parent.name === _parent) {
// if the children array is undefined, create an array
if (!parent.children)
parent.children = [];
// create the child
let child = {
name: _name
};
// add it to the parents children
parent.children.push(child);
// remove the line that was already checked
delete lines[i];
let subLines = lines.filter(function(el) {
return el != null;
});
// check if the child has any children
getChildren(child, subLines);
}
}
}
它的用途：
let csv = `name,parent
Level 2: A,Top Level
Top Level,null
Son of A,Level 2: A
Daughter of A,Level 2: A
Level 2: B,Top Level`;
let lines = csv.split(/\r\n|\n/);
let treeData = convertToJsonTree(lines);
console.log(treeData);
JSFiddle：https://jsfiddle.net/dbheale/Lrhsxw9e/
编辑：
要从文件中读取CSV，请执行以下操作：
function loadDiagramFromCsvFile(file)
{
var rawFile = new XMLHttpRequest();
rawFile.open("GET", file, false);
rawFile.onreadystatechange = function ()
{
if(rawFile.readyState === 4)
{
if(rawFile.status === 200 || rawFile.status == 0)
{
var csv = rawFile.responseText;
let lines = csv.split(/\r\n|\n/);
let treeData = convertToJsonTree(lines);
// Do what you need with your treeData here
// Maybe create a method that generates the diagram?
createDiagram(treeData);
}
}
}
rawFile.send(null);
}