从 CSV 数据创建 D3.js 可折叠树

Creating a D3.js Collapsible Tree from CSV data

本文关键字:js 可折叠 D3 创建 CSV 数据      更新时间:2023-09-26

对于那些更熟悉 d3 的人来说,这可能是一个有点愚蠢的问题,但我对它相当陌生,我不太弄清楚如何让这个东西工作:

我想要实现的是:http://bl.ocks.org/robschmuecker/7880033

但我想从平面 CSV 而不是 JSON 中提供数据。

问题是我拥有的 CSV 格式如下:

Parent Name | Child Name
-------------------------
Parent Name | Child Name
-------------------------
Parent Name | Child Name
so on...

有人可以指出我正确的方向吗?我知道 d3.csv 函数以某种方式工作,但我不知道如何将它"插入"到上面的示例中。

我很抱歉,我知道这听起来很像"为我做功课",但老实说,我已经很好地尝试了一下,我认为我被困住了。

谢谢。赞赏。

我以前没有看到您正在寻找什么,但它是从平面数据创建树的组合(这需要一些数据操作才能将其精细化为正确的结构)和标准加载数据来自和外部源使用 d3。

可悲的是,我无法为您设置一个bl.ock来演示实时代码,编辑:这是 bl.ocks.org 上运行代码的实时版本,以下是两种技术的组合的html文件;

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <title>Collapsible Tree Example</title>
    <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>
  </head>
  <body>
<!-- load the d3.js library -->	
<script src="http://d3js.org/d3.v3.min.js"></script>
	
<script>
// ************** Generate the tree diagram	 *****************
var margin = {top: 20, right: 120, bottom: 20, left: 120},
	width = 960 - margin.right - margin.left,
	height = 500 - margin.top - margin.bottom;
	
var i = 0;
var tree = d3.layout.tree()
	.size([height, width]);
var diagonal = d3.svg.diagonal()
	.projection(function(d) { return [d.y, d.x]; });
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 + ")");
// load the external data
d3.csv("treedata.csv", function(error, data) {
// *********** 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);
	}
});
  root = treeData[0];
  update(root);
});
function update(source) {
  // Compute the new tree layout.
  var nodes = tree.nodes(root).reverse(),
	  links = tree.links(nodes);
  // Normalize for fixed-depth.
  nodes.forEach(function(d) { d.y = d.depth * 180; });
  // Declare the nodes…
  var node = svg.selectAll("g.node")
	  .data(nodes, function(d) { return d.id || (d.id = ++i); });
  // Enter the nodes.
  var nodeEnter = node.enter().append("g")
	  .attr("class", "node")
	  .attr("transform", function(d) { 
		  return "translate(" + d.y + "," + d.x + ")"; });
  nodeEnter.append("circle")
	  .attr("r", 10)
	  .style("fill", "#fff");
  nodeEnter.append("text")
	  .attr("x", function(d) { 
		  return d.children || d._children ? -13 : 13; })
	  .attr("dy", ".35em")
	  .attr("text-anchor", function(d) { 
		  return d.children || d._children ? "end" : "start"; })
	  .text(function(d) { return d.name; })
	  .style("fill-opacity", 1);
  // Declare the links…
  var link = svg.selectAll("path.link")
	  .data(links, function(d) { return d.target.id; });
  // Enter the links.
  link.enter().insert("path", "g")
	  .attr("class", "link")
	  .attr("d", diagonal);
}
</script>
	
  </body>
</html>

以下是我在 html 文件中测试它的 csv 文件(名为树数据.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

值得称赞的是,nrabinowitz在这里描述了数据转换。

前面答案中的代码不可折叠。添加相同的可折叠版本。

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Collapsible Tree Example</title>
  <style>
    .node circle {
      fill: #fff;
      stroke: steelblue;
      stroke-width: 3px;
    }
    
    .node text {
      font: 9px sans-serif;
    }
    
    .link {
      fill: none;
      stroke: #ccc;
      stroke-width: 2px;
    }
  </style>
</head>
<body>

  <!-- load the d3.js library -->
  <script src="https://d3js.org/d3.v3.min.js"></script>
  <script>
    // ************** Generate the tree diagram  *****************
    var margin = {
        top: 20,
        right: 120,
        bottom: 20,
        left: 20
      },
      width = 960 - margin.right - margin.left,
      height = 800 - margin.top - margin.bottom,
      duration = 750;
    var root;
    var i = 0;
    var tree = d3.layout.tree()
      .size([height, width]);
    var diagonal = d3.svg.diagonal()
      .projection(function(d) {
        return [d.y, d.x];
      });
    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 + ")");
    // load the external data
    d3.csv("d3tree.csv", function(error, data) {
      // *********** 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);
        }
      });

      function collapse(d) {
        if (d.children) {
          d._children = d.children;
          d._children.forEach(collapse);
          d.children = null;
        }
      }
      root = treeData[0];
      root.x0 = height / 2;
      root.y0 = 0;
      console.log(root)
      //  root.children.forEach(collapse)
      update(root);
    });
    d3.select(self.frameElement).style("height", "800px");
    function update(source) {
      // Compute the new tree layout.
      var nodes = tree.nodes(root).reverse(),
        links = tree.links(nodes);
      // Normalize for fixed-depth.
      nodes.forEach(function(d) {
        d.y = d.depth * 180;
      });
      // Update the nodes…
      var node = svg.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")
        .attr("class", "node")
        .attr("transform", function(d) {
          return "translate(" + source.y0 + "," + source.x0 + ")";
        })
        .on("click", click);
      nodeEnter.append("circle")
        .attr("r", 1e-6)
        .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", ".01em")
        .attr("text-anchor", function(d) {
          return d.children || d._children ? "end" : "start";
        })
        .text(function(d) {
          return d.name;
        })
        .style("fill-opacity", 1e-6);
      // Transition nodes to their new position.
      var nodeUpdate = node.transition()
        .duration(duration)
        .attr("transform", function(d) {
          return "translate(" + d.y + "," + d.x + ")";
        });
      nodeUpdate.select("circle")
        .attr("r", 5)
        .style("fill", function(d) {
          return d._children ? "lightsteelblue" : "#fff";
        });
      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", 1e-6);
      nodeExit.select("text")
        .style("fill-opacity", 1e-6);
      // Update the links…
      var link = svg.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;
      });


    }
    // 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>
</html>