隐藏附加的子节点 onClick()

Question

我正在处理一个小的 D3.js 图，如果单击较大的父节点，我想隐藏连接的较小节点。到目前为止，我尝试了几种方法，首先过滤链接以在之后接收源节点可能是我最好的尝试。

不幸的是我收到newLinks.map is not a function error，要么我完全误解了地图功能，要么只是错过了最后的和平。

  function onClick(event, d) {
        const newLinks = link.filter(link => link.target.id === d.id);     
        console.log(newLinks)

        const newNodes = newLinks.map(link => data.nodes.find(newNode => newNode.id === link.source.id))
        console.log(newNodes)
    }

问题： 我怎样才能实现我所追求的目标？如果单击父节点，我想隐藏较小的附加节点。

var svg = d3.select("body").append("svg")
  .attr("width", window.innerWidth)
  .attr("height", window.innerHeight)

var data = {
  "nodes": [{
      "id": "A",
      "type": "parent"
    },
    {
      "id": "B",
      "type": "parent"
    },
    {
      "id": "C",
      "type": "child"
    },
    {
      "id": "D",
      "type": "child"
    },
    {
      "id": "E",
      "type": "child"
    },
  ],
  "links": [{
      "source": "A",
      "target": "B",
      "distance": 125
    },
    {
      "source": "C",
      "target": "A",
      "distance": 20
    },
    {
      "source": "D",
      "target": "A",
      "distance": 20
    },
    {
      "source": "E",
      "target": "B",
      "distance": 20
    },
  ]
}

var force = d3.forceSimulation()
  .force("link", d3.forceLink().id(function(d) {
    return d.id
  }).distance(function(d) {
    return d.distance
  }))
  .force("center", d3.forceCenter(window.innerWidth / 2, window.innerHeight / 2))
  .force("charge", d3.forceManyBody().strength(-1000))
  .force("collision", d3.forceCollide().radius(setSize))

var linksContainer = svg.append("g").attr("class", "linksContainer")
var nodesContainer = svg.append("g").attr("class", "nodesContainer")

initialize()

function initialize() {
  link = linksContainer.selectAll("line")
    .data(data.links)
    .join("line")
    .attr("class", "line")

  node = nodesContainer.selectAll(".node")
    .data(data.nodes, d => d.id)
    .join("g")
    .attr("class", "node")
    .call(d3.drag()
      .on("start", dragStarted)
      .on("drag", dragged)
      .on("end", dragEnded)
    )

  node.selectAll("circle")
    .data(d => [d])
    .join("circle")
    .attr("r", setSize)
    .on("click", onClick)

  force
    .nodes(data.nodes)
    .on("tick", ticked)

  force
    .force("link")
    .links(data.links)
}


function setSize(d) {
  switch (d.type) {
    case "parent":
      return 40
    case "child":
      return 20
    default:
      return 40
  }
}

function onClick(event, d) {
  const newLinks = link.filter(link => link.target.id === d.id);
  console.log(newLinks)

  const newNodes = newLinks.map(link => data.nodes.find(newNode => newNode.id === link.source.id))
  console.log(newNodes)
}

function ticked() {
  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;
    });

  node
    .attr("transform", function(d) {
      return "translate(" + d.x + ", " + d.y + ")";
    });
}

function dragStarted(event, d) {
  if (!event.active) force.alphaTarget(0.3).restart();
  d.fx = d.x;
  d.fy = d.y;
}

function dragged(event, d) {
  d.fx = event.x;
  d.fy = event.y;
}

function dragEnded(event, d) {
  if (!event.active) force.alphaTarget(0);
  d.fx = undefined;
  d.fy = undefined;
}

body {
  overflow: hidden;
  background: #e6e7ee;
  margin: 0;
}

circle {
  fill: whitesmoke;
  stroke: black;
}

line {
  stroke: black;
}

<script src="https://d3js.org/d3.v7.js"></script>

Answer 1

您需要了解数据数组和 d3 选择之间的区别。在您的代码中，link 和 node 是代表圆圈和直线的 d3 选择。它们不是基础数据的表示。

但是，它们确实提供了一些在此上下文中有用的函数。例如，您可以使用 .each(...) 而不是 forEach 来遍历元素，或者 .data() 来获取 d3 选择表示为数组的对象，因此 link.data().map 是绝对是一个有效的功能。

我通过向每个节点添加属性 isVisible 或确定可见性的 link 来实现您想要的。然而，这绝对不是最好的或唯一的方法，所以请随意探索替代方案。

var svg = d3.select("body").append("svg")
  .attr("width", window.innerWidth)
  .attr("height", window.innerHeight)

var data = {
  "nodes": [{
      "id": "A",
      "type": "parent"
    },
    {
      "id": "B",
      "type": "parent"
    },
    {
      "id": "C",
      "type": "child"
    },
    {
      "id": "D",
      "type": "child"
    },
    {
      "id": "E",
      "type": "child"
    },
  ],
  "links": [{
      "source": "A",
      "target": "B",
      "distance": 125
    },
    {
      "source": "C",
      "target": "A",
      "distance": 20
    },
    {
      "source": "D",
      "target": "A",
      "distance": 20
    },
    {
      "source": "E",
      "target": "B",
      "distance": 20
    },
  ]
}

var force = d3.forceSimulation()
  .force("link", d3.forceLink().id(function(d) {
    return d.id
  }).distance(function(d) {
    return d.distance
  }))
  .force("center", d3.forceCenter(window.innerWidth / 2, window.innerHeight / 2))
  .force("charge", d3.forceManyBody().strength(-1000))
  .force("collision", d3.forceCollide().radius(setSize))

var linksContainer = svg.append("g").attr("class", "linksContainer")
var nodesContainer = svg.append("g").attr("class", "nodesContainer")

initialize()

function initialize() {
  const links = data.links
    .filter(link => link.isVisible !== false);
  const nodes = data.nodes.filter(node =>
    node.isVisible !== false);

  link = linksContainer.selectAll("line")
    .data(links)
    .join("line")
    .attr("class", "line")

  node = nodesContainer.selectAll(".node")
    .data(nodes, d => d.id)
    .join("g")
    .attr("class", "node")
    .call(d3.drag()
      .on("start", dragStarted)
      .on("drag", dragged)
      .on("end", dragEnded)
    )

  node.selectAll("circle")
    .data(d => [d])
    .join("circle")
    .attr("r", setSize)
    .on("click", onClick)

  force
    .nodes(nodes)
    .on("tick", ticked)

  force
    .force("link")
    .links(links)
}


function setSize(d) {
  switch (d.type) {
    case "parent":
      return 40
    case "child":
      return 20
    default:
      return 40
  }
}

function onClick(event, d) {
  link.data()
    .forEach(link => {
      link.isVisible = link.target.id === d.id;
    });
  const visibleNodeIds = [
    d.id,
    ...link.data()
    .filter(l => l.isVisible)
    .map(l => l.source.id)
  ];

  node.data()
    .forEach(node => {
      node.isVisible = visibleNodeIds.includes(node.id);
    });

  initialize();
}

function ticked() {
  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;
    });

  node
    .attr("transform", function(d) {
      return "translate(" + d.x + ", " + d.y + ")";
    });
}

function dragStarted(event, d) {
  if (!event.active) force.alphaTarget(0.3).restart();
  d.fx = d.x;
  d.fy = d.y;
}

function dragged(event, d) {
  d.fx = event.x;
  d.fy = event.y;
}

function dragEnded(event, d) {
  if (!event.active) force.alphaTarget(0);
  d.fx = undefined;
  d.fy = undefined;
}

body {
  overflow: hidden;
  background: #e6e7ee;
  margin: 0;
}

circle {
  fill: whitesmoke;
  stroke: black;
}

line {
  stroke: black;
}

<script src="https://d3js.org/d3.v7.js"></script>

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