SVG元素无法按百分比设置高度

Question

我在下面的代码中包含一个打开我的模态的按钮。模态内部是SVG元素。问题是我正在尝试设置该元素的高度和宽度，但似乎不起作用。

它仅适用于我的宽度而不适用于高度。当我尝试按px设置高度时，它可以工作，但是如果按百分比设置，则不能。

我不确定为什么会这样，但是我想按百分比设置身高。任何帮助/建议将不胜感激。谢谢。

  var graph = {
    "nodes": [{ "id": "Apple", "group": 1 }, { "id": "Cherry", "group": 1 }, { "id": "Tomato", "group": 1 }, { "id": "Chilli", "group": 1 }, { "id": "Red Fruits", "group": 1 }],

    "links": [{ "source": "Apple", "target": "Red Fruits", "value": 10, "type": "A" },
    { "source": "Cherry", "target": "Red Fruits", "value": 10, "type": "A" },
    { "source": "Tomato", "target": "Red Fruits", "value": 10, "type": "A" },
    { "source": "Chilli", "target": "Red Fruits", "value": 10, "type": "A" }]


  };
  var fruits = ["Apple", "Cherry", "Tomato", "Chilli"];
  var color = ["Red Fruits"];

  var colorNodes = graph["nodes"];
  let greyNodes = colorNodes;
  greyNodes.forEach((obj) => {
    if (fruits.includes(obj.id.toString())) obj.group = "1"
  })

  let redNodes = greyNodes;
  redNodes.forEach((obj) => {
    if (color.includes(obj.id.toString())) obj.group = "2"
  })


  var colorLinks = graph["links"];
  let linksArray = colorLinks;
  linksArray.forEach((obj) => {
    if (color.includes(obj.target.toString())) obj.type = "B"
  })

  var svg = d3.select("svg"),
    width = +svg.attr("width"),
    height = +svg.attr("height");

  var zoom_handler = d3.zoom().on("zoom", zoom_actions);

  var simulation = d3.forceSimulation()
    .force("link", d3.forceLink().distance(300).id(function (d) {
      return d.id;
    }))
    .force("charge", d3.forceManyBody().strength(-300))
    .force("center", d3.forceCenter(width / 2, height / 2));

  var g = svg.append("g")
    .attr("class", "everything");

  svg.call(zoom_handler)
    .call(zoom_handler.transform, d3.zoomIdentity.translate(100, 100).scale(1));

  var link = g.append("g")
    .attr("class", "links")
    .selectAll("line")
    .data(graph.links)
    .enter().append("line")
    .style("stroke", linkColour)
    .attr("stroke-width", function (d) {
      return Math.sqrt(d.value);
    });

  var nodeGroup = g.append("g")
    .attr("class", "nodes");

  var node = nodeGroup.selectAll("circle")
    .data(graph.nodes)
    .enter().append("circle")
    .attr("r", 8)
    .attr("fill", circleColour)
    .attr("id", function (d) { return d.id })
    .call(d3.drag()
      .on("start", dragstarted)
      .on("drag", dragged)
      .on("end", dragended));

  function cleanId(id) { return id.replace(/[^A-Z0-9]/ig, "_"); }

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

  node.each(d => {
    nodeGroup.append("text") // Labelling for nodes
      .attr("id", 't_' + cleanId(d.id))
      .text(d.id);
  });

  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("cx", function (d) { return d.x; })
      .attr("cy", function (d) { return d.y; })
      .each(d => { d3.select('#t_' + cleanId(d.id)).attr('x', d.x + 10).attr('y', d.y + 3); });
  };

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

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

  function circleColour(d) {
    if (d.group == "1") {
      return "DimGrey";
    } else if (d.group == "2") {
      return "#81C784";
    }
    else {
      return "blue"
    }
  }

  function linkColour(d) {
    if (d.type == "A") {
      return "DimGrey";
    } else {
      return "SpringGreen";
    }
  }


  function zoom_actions() {
    g.attr("transform", d3.event.transform)
  }

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

  function dragged(d) {
    d.fx = d3.event.x;
    d.fy = d3.event.y;
  }

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

    .modal-posit {
      position: relative;
    }

    .links line {
      stroke: #999;
      stroke-opacity: 0.6;
    }

    .nodes circle {
      stroke: #000;
      stroke-width: 1.5px;
    }

    text {
      font-size: 30px;
      font-weight: bold;
    }
    .modal-lg{
      width: 90%;
      height: 80%;
    }
    .center{
      display: flex;
    justify-content: center;
    }
    svg{
      border: 1px solid black;
    }

<!DOCTYPE html>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<html>

<head>
  <meta charset="utf-8" />
  <style>

  </style>
  <link rel="shortcut icon" href="//#" />
  <script type="text/javascript" src="https://html2canvas.hertzen.com/dist/html2canvas.js"></script>
  <script type="text/javascript" src="https://html2canvas.hertzen.com/dist/html2canvas.min.js"></script>
</head>

<body>
  <div id="capture">



    <button class="modal-button" data-toggle="modal" data-target="#myModal2">MODAL BUTTON</button>


    <div class="modal fade" id="myModal2" role="dialog">
      <div class="modal-dialog modal-lg">
        <div class="modal-content">
          <div class="modal-header">
            <button type="button" class="close" data-dismiss="modal">&times;</button>
            <h2 class="modal-title center">GRAPH</h2>
          </div>
          <div class="modal-body">
            <div class="center">
            <svg style="width: 90%; height: 90%;"></svg>
            </div>
          </div>
        </div>
        <div class="modal-footer">
          <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
        </div>
      </div>
    </div>
  </div>
  </div>

</body>

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

<script>


</script>

Answer 1

  

百分比值将宽度定义为包含块宽度的百分比。   如果包含块的宽度取决于元素的宽度，则结果布局不确定。

设置包含SVG的块的宽度和高度。