Question

的index.html：

<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8" />
  <script data-require="d3@4.0.0" data-semver="4.0.0" src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    .node circle {
      fill: #fff;
      stroke: steelblue;
      stroke-width: 3px;
    }
    .node rect {
      fill: #fff;
      stroke: steelblue;
      stroke-width: 3px;
    }
    .node text {
      font: 12px sans-serif;
    }
    .link {
      fill: none;
      stroke: #ccc;
      stroke-width: 2px;
    }
    .arrow {
      fill: none;
      stroke: #ccc;
      stroke-width: 1px;
    }
  </style>
</head>

<body>
  <script>
	
	var treeData = {
      "name": "File 1",
       "children": [{
			"name": "File 2",
			"children": [
			{
				"name": "File 3",
				"children": [{
					"name": "File 4",
					"type": "data"
					}]
			},
			{
				"name": "File 5",
				"children": [{
					"name": "File 6",
					"type": "data",
					"children": [
						{
							"name": "File 7"
						},
						{
							"name": "File 8",
							"type": "data"
						}
						]
					}]
			}
				],
          }]
    };

    // Set the dimensions and margins of the diagram
var margin = {top: 20, right: 90, bottom: 30, left: 90},
    width = 5000 - 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.filter(function(d){
        return (!d.data.type || d.data.type !== 'data');
      }).append('circle')
        .attr('class', 'node')
        .attr('r', 1e-6)
        .style("fill", function(d) {
          return d._children ? "lightsteelblue" : "#fff";
        });
        
      nodeEnter.filter(function(d){
        return (d.data.type && d.data.type === 'data');
      }).append('rect')
        .attr('class', 'node')
        .attr('width', 20)
        .attr('height', 20)
        .attr('y', -10)
        .attr('x', -10)
        .style("fill", function(d) {
          return d._children ? "lightsteelblue" : "#fff";
        });

  // Add labels for the nodes
      nodeEnter.append('text')
        .attr("dy", "2em")
        .attr("x", function(d) {
          return d.children || d._children ? 13 : 13;
        })
        .attr("text-anchor", function(d) {
          return d.children || d._children ? "start" : "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)
      });
  
  svg.append("text")
     .attr("id", "curve-text")
	 .append("textPath")
	 .attr("xlink:href", "#link")
	 .data(treeData, function(d, i){return i;})

  // 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>

所需产品：

对于其右侧有多条路径的每个节点，顶部路径应该有一个1，随着您的下降而增加，如上图所示。我已经看过https://gist.github.com/mbostock/2565344和draw text in d3 arc javascript，但无法将数字添加到图表中。

我知道您可能应该使用.append('text')，但我不确定如何将“追加”到路径中，我也不知道如何正确设置属性和文本值这个案例。对此的任何答案都应该是可扩展的 - 即，不要假设只有两条路径。

Answer 1

另一个有趣的问题。我会这样做的。

首先，更改linkEnter以附加g并将g添加到path和text。

// Enter any new links at the parent's previous position.
var linkEnter = link.enter().insert('g', 'g')
  .attr("class", "link");

linkEnter.append('path')
  .attr('d', function(d) {
    var o = {
      x: source.x0,
      y: source.y0
    }
    return diagonal(o, o)
  });

linkEnter.append('text')
...

第二，要计算计数，这里有一个基于父母子女长度的棘手小函数，以及你在链接迭代中的位置：

.text(function(d,i) {
  if (d.parent && d.parent.children.length > 1){
    if (!d.parent.index) d.parent.index = 0;
    return ++d.parent.index;
  }
})

最后，对于这个位置，我不会乱用textPath，这有点矫枉过正。只需计算链接的中点即可。

.attr('transform', function(d){
  if (d.parent) {
    return 'translate(' + ((d.parent.y + d.y) / 2) + ',' + ((d.parent.x + d.x) / 2) + ')'
  }
})

全部放在一起：

<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8" />
  <script data-require="d3@4.0.0" data-semver="4.0.0" src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    .node circle {
      fill: #fff;
      stroke: steelblue;
      stroke-width: 3px;
    }
    
    .node rect {
      fill: #fff;
      stroke: steelblue;
      stroke-width: 3px;
    }
    
    .node text {
      font: 12px sans-serif;
    }
    
    .link path {
      fill: none;
      stroke: #ccc;
      stroke-width: 2px;
    }
    
    .link text {
      font: 12px sans-serif;
    }
    
    .arrow {
      fill: none;
      stroke: #ccc;
      stroke-width: 1px;
    }
  </style>
</head>

<body>
  <script>
    var treeData = {
      "name": "File 1",
      "children": [{
        "name": "File 2",
        "children": [{
          "name": "File 3",
          "children": [{
            "name": "File 4",
            "type": "data"
          }]
        }, {
          "name": "File 5",
          "children": [{
            "name": "File 6",
            "type": "data",
            "children": [{
              "name": "File 7"
            }, {
              "name": "File 8",
              "type": "data"
            }]
          }]
        }],
      }]
    };

    // Set the dimensions and margins of the diagram
    var margin = {
        top: 20,
        right: 90,
        bottom: 30,
        left: 90
      },
      width = 5000 - 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.filter(function(d) {
          return (!d.data.type || d.data.type !== 'data');
        }).append('circle')
        .attr('class', 'node')
        .attr('r', 1e-6)
        .style("fill", function(d) {
          return d._children ? "lightsteelblue" : "#fff";
        });

      nodeEnter.filter(function(d) {
          return (d.data.type && d.data.type === 'data');
        }).append('rect')
        .attr('class', 'node')
        .attr('width', 20)
        .attr('height', 20)
        .attr('y', -10)
        .attr('x', -10)
        .style("fill", function(d) {
          return d._children ? "lightsteelblue" : "#fff";
        });

      // Add labels for the nodes
      nodeEnter.append('text')
        .attr("dy", "2em")
        .attr("x", function(d) {
          return d.children || d._children ? 13 : 13;
        })
        .attr("text-anchor", function(d) {
          return d.children || d._children ? "start" : "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('g.link')
        .data(links, function(d) {
          return d.id;
        });

      // Enter any new links at the parent's previous position.
      var linkEnter = link.enter().insert('g', 'g')
        .attr("class", "link");
        
      linkEnter.append('path')
        .attr('d', function(d) {
          var o = {
            x: source.x0,
            y: source.y0
          }
          return diagonal(o, o)
        });

      linkEnter.append('text')
        .text(function(d,i) {
          if (d.parent && d.parent.children.length > 1){
            if (!d.parent.index) d.parent.index = 0;
            return ++d.parent.index;
          }
        })
        .attr('dy', "-1em");

      // UPDATE
      var linkUpdate = linkEnter.merge(link);

      // Transition back to the parent element position
      linkUpdate.select('path').transition()
        .duration(duration)
        .attr('d', function(d) {
          return diagonal(d, d.parent)
        });
        
      linkUpdate.select('text').transition()
        .duration(duration)
        .attr('transform', function(d){
          if (d.parent) {
            return 'translate(' + ((d.parent.y + d.y) / 2) + ',' + ((d.parent.x + d.x) / 2) + ')'
          }
        })
        
      // Remove any exiting links
      link.exit().each(function(d){
        d.parent.index = 0;
      })
      
      var linkExit = link.exit()
        .transition()
        .duration(duration);
      
      linkExit.select('path')
        .attr('d', function(d) {
          var o = {
            x: source.x,
            y: source.y
          }
          return diagonal(o, o)
        })
        
      linkExit.select('text')
        .style('opacity', 0);
      
      linkExit.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>

Answer 2

您需要通过创建d3选择并为每个链接附加文本元素来添加文本。

// Select all text links
var linkText = svg.selectAll('text.link')
    .data(links, function(d) {return d.id});

// Then append the text on the enter selection
var linkEnter = linkText.enter().insert('text','g')
    .attr('class','link')
    .attr('x',function(d){return (d.target.x-d.source.x)/2;})
    .attr('y',function(d){return (d.target.y-d.source.y)/2;})
    .text(function(d){return d['cardinality'];});

注意：这只是添加文本元素。您还需要更新文本位置，并在删除这些链接后更新并删除它们。遵循与您拥有的path.link d3选项相同的结构。

您还需要一种方法来计算每个链接的“基数”。我假设您可以通过循环链接数组并检查多个链接是否具有相同的源来完成，然后计数，否则为该链接提供0或特殊的基数。

D3.js树在节点上编号

的index.html：

2 个答案: