Question

我有一个共享国界的国家强制指导图。我想在每个节点上显示国家的标志。我可以在生成的HTML中看到图像，也可以看到它占据了窗口中的空间，但它不可见。

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <link rel="stylesheet" href="flags/flags.css">
  <link rel="stylesheet" href="index.css">
  <title>National Contiguity Visualization</title>
</head>
<body>
  <div class="details">National Contiguity</div>
  <svg class="plot"></svg>
  <div class="tooltip hidden"></div>
  <svg width="100" height="100">
      <foreignobject class="node" >

          <img class="flag flag-cz" alt="Czech Republic" src="flags/blank.png"/>                    
      </foreignobject>
  </svg>

  <script src="https://d3js.org/d3.v4.min.js"></script>
  <script src="index.js"></script>
</body>
</html>

这是JS文件。

const apiUrl = 'https://raw.githubusercontent.com/DealPete/forceDirected/master/countries.json';
const tooltip = document.getElementsByClassName('tooltip')[0];

const dragstarted = d => {
  if (!d3.event.active) simulation.alphaTarget(0.3).restart();
  d.fx = d.x;
  d.fy = d.y;
}

const dragged = d => {
  d.fx = d3.event.x;
  d.fy = d3.event.y;
}

const dragended = d => {
  if (!d3.event.active) simulation.alphaTarget(0);
  d.fx = null;
  d.fy = null;
}

const plot = (data) => {
  data.nodes = data.nodes.map((d, index) => {
    d['id'] = index;
    return d;
  });
  const margin = {
    top: 20,
    right: 20,
    bottom: 10,
    left: 100
  };
  const width = Math.max((((window.innerWidth / 100) * 80) - margin.right - margin.left), 700);
  const height = ((window.innerHeight / 100) * 80) - margin.bottom - margin.top;
  const svg = d3.select('svg')
    .attr('width', width + margin.left + margin.right + 100)
    .attr('height', height + margin.top + margin.bottom + 100)
    .append('g')
    .attr('transform',
      `translate(${margin.left}, ${margin.top})`);

  const simulation = d3.forceSimulation()
    .force('link', d3.forceLink().id(function (d) { return d.id; }).distance(100).strength(1))
    .force('charge', d3.forceManyBody())
    .force('center', d3.forceCenter(width / 2, height / 2));

  const dragstarted = d => {
    if (!d3.event.active) simulation.alphaTarget(0.3).restart();
    d.fx = d.x;
    d.fy = d.y;
  }

  const dragged = d => {
    d.fx = d3.event.x;
    d.fy = d3.event.y;
  }

  const dragended = d => {
    if (!d3.event.active) simulation.alphaTarget(0);
    d.fx = null;
    d.fy = null;
  }

  const ticked = () => {
    link
      .attr("x1", d => d.source.x)
      .attr("y1", d => d.source.y)
      .attr("x2", d => d.target.x)
      .attr("y2", d => d.target.y);

    node
      .attr("x", function (d) { return d.x = Math.max(5, Math.min(width - 5, d.x)); })
      .attr("y", function (d) { return d.y = Math.max(5, Math.min(height - 5, d.y)); });
  }

  const link = svg.append('g')
    .attr('class', 'links')
    .selectAll('line')
    .data(data.links)
    .enter().append('line')
    .attr('stroke-width', function (d) { return Math.sqrt(d.value); });

  const node = svg.append('g')
    .attr('class', 'nodes')
    .selectAll('.flag')
    .data(data.nodes)
    .enter()
    .append('foreignobject')
    .append('img')
    .attr('src', 'flags/blank.png')
    .attr('class', d => `flag flag-cz`)
    .attr('width', '5px')
    .attr('height', '5px')
    .attr("x", -8)
    .attr("y", -8)
    .call(d3.drag()
      .on('start', dragstarted)
      .on('drag', dragged)
      .on('end', dragended));

  node.append("title")
    .text(function (d) { return d.country; })
    .exit();

  simulation
    .nodes(data.nodes)
    .on("tick", ticked);

  simulation.force("link")
    .links(data.links);

}

const fetchData = () => {
  return fetch(apiUrl)
    .then(response => {
      return response.json();
    });
};

const fetchAndPlot = async () => {
  try {
    const response = await fetchData();
    console.log(response);
    plot(response);
  } catch (e) {
    console.error(e);
  }
}

fetchAndPlot();

尝试了svg图像元素和foreignobject方法。直接用HTML编写的那个是正确呈现的。在过去的3/4天内无法弄清楚这个问题。

回购：National Contiguity Visualization

提前致谢。

Answer 1

您需要在foreignObject标记上使用width和height属性
foreignObject拼写为大写字母O，虽然HTML标记不区分大小写，但元素的DOM创建因此d3区分大小写。
d3希望HTML标记以xhtml为前缀：

由于您没有提供标记，我使用了示例标记。请注意，目前您的所有节点都是一个在另一个上面，但我想如果您无法解决这个问题，那么这就是另一个问题。

＆＃13;

const apiUrl = 'https://raw.githubusercontent.com/DealPete/forceDirected/master/countries.json';
const tooltip = document.getElementsByClassName('tooltip')[0];

const dragstarted = d => {
  if (!d3.event.active) simulation.alphaTarget(0.3).restart();
  d.fx = d.x;
  d.fy = d.y;
}

const dragged = d => {
  d.fx = d3.event.x;
  d.fy = d3.event.y;
}

const dragended = d => {
  if (!d3.event.active) simulation.alphaTarget(0);
  d.fx = null;
  d.fy = null;
}

const plot = (data) => {
  data.nodes = data.nodes.map((d, index) => {
    d['id'] = index;
    return d;
  });
  const margin = {
    top: 20,
    right: 20,
    bottom: 10,
    left: 100
  };
  const width = Math.max((((window.innerWidth / 100) * 80) - margin.right - margin.left), 700);
  const height = ((window.innerHeight / 100) * 80) - margin.bottom - margin.top;
  const svg = d3.select('svg')
    .attr('width', width + margin.left + margin.right + 100)
    .attr('height', height + margin.top + margin.bottom + 100)
    .append('g')
    .attr('transform',
      `translate(${margin.left}, ${margin.top})`);

  const simulation = d3.forceSimulation()
    .force('link', d3.forceLink().id(function (d) { return d.id; }).distance(100).strength(1))
    .force('charge', d3.forceManyBody())
    .force('center', d3.forceCenter(width / 2, height / 2));

  const dragstarted = d => {
    if (!d3.event.active) simulation.alphaTarget(0.3).restart();
    d.fx = d.x;
    d.fy = d.y;
  }

  const dragged = d => {
    d.fx = d3.event.x;
    d.fy = d3.event.y;
  }

  const dragended = d => {
    if (!d3.event.active) simulation.alphaTarget(0);
    d.fx = null;
    d.fy = null;
  }

  const ticked = () => {
    link
      .attr("x1", d => d.source.x)
      .attr("y1", d => d.source.y)
      .attr("x2", d => d.target.x)
      .attr("y2", d => d.target.y);

    node
      .attr("x", function (d) { return d.x = Math.max(5, Math.min(width - 5, d.x)); })
      .attr("y", function (d) { return d.y = Math.max(5, Math.min(height - 5, d.y)); });
  }

  const link = svg.append('g')
    .attr('class', 'links')
    .selectAll('line')
    .data(data.links)
    .enter().append('line')
    .attr('stroke-width', function (d) { return Math.sqrt(d.value); });

  const node = svg.append('g')
    .attr('class', 'nodes')
    .selectAll('.flag')
    .data(data.nodes)
    .enter()
    .append('foreignObject')
    .attr('width', '100')
    .attr('height', '100')
    .append('xhtml:img')
    .attr('src', 'https://flaglane.com/download/british-flag/british-flag-small.gif')
    .attr('class', d => `flag flag-cz`)
    .call(d3.drag()
      .on('start', dragstarted)
      .on('drag', dragged)
      .on('end', dragended));

  node.append("title")
    .text(function (d) { return d.country; })
    .exit();

  simulation
    .nodes(data.nodes)
    .on("tick", ticked);

  simulation.force("link")
    .links(data.links);

}

const fetchData = () => {
  return fetch(apiUrl)
    .then(response => {
      return response.json();
    });
};

const fetchAndPlot = async () => {
  try {
    const response = await fetchData();
    plot(response);
  } catch (e) {
    console.error(e);
  }
}

fetchAndPlot();

＆＃13;

<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <link rel="stylesheet" href="flags/flags.css">
  <link rel="stylesheet" href="index.css">
  <title>National Contiguity Visualization</title>
</head>
<body>
  <div class="details">National Contiguity</div>
  <svg class="plot"></svg>
  <div class="tooltip hidden"></div>

  <script src="https://d3js.org/d3.v4.min.js"></script>
  <script src="index.js"></script>
</body>
</html>

＆＃13;

无法在D3力导向图内渲染图像

1 个答案: