Question

我正在浏览器中处理cytoscape.js图。当鼠标悬停在cytoscape图中的节点上时，我想显示一些节点信息（例如，节点标签）。以下代码适用于console.log()，但我想在浏览器中显示信息：

cy.on('mouseover', 'node', function(evt){
    var node = evt.target;
    console.log( 'mouse on node' + node.data('label') );
});

请帮助！

Answer 1

Cytoscape.js在此问题上有两个非常合适的扩展名：qTip2和popper.js，带有小费。我可以为您提供qTip的示例，popper在stackoverflow片段中对我来说真的不起作用：

qTip：

var cy = (window.cy = cytoscape({
  container: document.getElementById("cy"),

  boxSelectionEnabled: false,
  autounselectify: true,

  style: [
    {
      selector: "node",
      css: {
        content: "data(id)",
        "text-valign": "center",
        "text-halign": "center",
        height: "60px",
        width: "60px",
        "border-color": "black",
        "border-opacity": "1",
        "border-width": "10px"
      }
    },
    {
      selector: "$node > node",
      css: {
        "padding-top": "10px",
        "padding-left": "10px",
        "padding-bottom": "10px",
        "padding-right": "10px",
        "text-valign": "top",
        "text-halign": "center",
        "background-color": "#bbb"
      }
    },
    {
      selector: "edge",
      css: {
        "target-arrow-shape": "triangle"
      }
    },
    {
      selector: "edge[label]",
      css: {
        label: "data(label)",
        "text-rotation": "autorotate",
        "text-margin-x": "0px",
        "text-margin-y": "0px"
      }
    },
    {
      selector: ":selected",
      css: {
        "background-color": "black",
        "line-color": "black",
        "target-arrow-color": "black",
        "source-arrow-color": "black"
      }
    }
  ],
  layout: {
    name: "circle"
  }
}));

var info = [
  {
    name: "Peter",
    next_op_name: "Claire"
  },
  {
    name: "Claire",
    next_op_name: "Mike"
  },
  {
    name: "Mike",
    next_op_name: "Rosa"
  },
  {
    name: "Rosa",
    next_op_name: "Peter"
  }
];

cy.ready(function() {
  var array = [];
  // iterate over info once
  for (var i = 0; i < info.length; i++) {
    array.push({
      group: "nodes",
      data: {
        id: info[i].name, // id is name!!!
        label: info[i].name
      }
    });
    array.push({
      group: "edges",
      data: {
        id: "e" + i,
        source: info[i].name,
        target: info[i].next_op_name,
        label: "e" + i
      }
    });
  }
  cy.add(array);
  cy.layout({ name: "circle" }).run();
});
cy.on("mouseover", "node", function(event) {
  var node = event.target;
  node.qtip(
    {
      content: node.id(),
      show: {
        event: event.type,
        ready: true
      },
      hide: {
        event: "mouseout unfocus"
      }
    },
    event
  );
});

body {
  font: 14px helvetica neue, helvetica, arial, sans-serif;
}

#cy {
  height: 100%;
  width: 75%;
  position: absolute;
  left: 0;
  top: 0;
  float: left;
}

<html>

<head>
  <meta charset=utf-8 />
  <meta name="viewport" content="user-scalable=no, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, minimal-ui">
  <script src="https://unpkg.com/cytoscape@3.3.0/dist/cytoscape.min.js"></script>
  <!-- qtip imports -->
  <script src="https://unpkg.com/jquery@3.3.1/dist/jquery.js"></script>
  <script src="http://cdnjs.cloudflare.com/ajax/libs/qtip2/2.2.0/jquery.qtip.min.js"></script>
  <link href="http://cdnjs.cloudflare.com/ajax/libs/qtip2/2.2.0/jquery.qtip.min.css" rel="stylesheet" type="text/css" />
  <script src="https://cdn.rawgit.com/cytoscape/cytoscape.js-qtip/2.7.0/cytoscape-qtip.js"></script>

  <!-- dagre imports -->
  <script src="https://unpkg.com/dagre@0.7.4/dist/dagre.js"></script>
  <script src="https://cdn.rawgit.com/cytoscape/cytoscape.js-dagre/1.5.0/cytoscape-dagre.js"></script>
</head>

<body>
  <div id="cy"></div>
</body>

</html>

Answer 2

大家好，Stephan 的回答不能像 React.js 那样使用基于模块的代码，所以我给你一个没有提示的替代方案

popper.css // popper 样式

.popper-div { // fill free to modify as you prefer
  position: relative;
  background-color: #333;
  color: #fff;
  border-radius: 4px;
  font-size: 14px;
  line-height: 1.4;
  outline: 0;
  padding: 5px 9px;
}

App.js

import cytoscape from "cytoscape";
import popper from "cytoscape-popper"; // you have to install it

import "./popper.css";

cytoscape.use(popper);

const cy = cytoscape({....});

cy.elements().unbind("mouseover");
cy.elements().bind("mouseover", (event) => {
  event.target.popperRefObj = event.target.popper({
    content: () => {
      let content = document.createElement("div");

      content.classList.add("popper-div");

      content.innerHTML = event.target.id();

      document.body.appendChild(content);
      return content;
    },
  });
});

cy.elements().unbind("mouseout");
cy.elements().bind("mouseout", (event) => {
  if (event.target.popper) {
    event.target.popperRefObj.state.elements.popper.remove();
    event.target.popperRefObj.destroy();
  }
});

在cytoscape中的鼠标悬停时显示和隐藏节点信息

2 个答案:

qTip：