如何更改 Cytoscape.js 网格中单个节点的颜色

Question

如何更改布局中已存在的节点或边缘的颜色（没有 deleting/adding 它）？

我有一个带有预选位置的节点布局，我想更改颜色（节点和边），但不是每个节点（或边）。我已经试过了

cy.style('background-color', 'color');

，允许更改颜色，但它会更改每个节点的颜色。

我只想改变一个节点的样式

非常感谢

罗伯特

Answer 1

解释：

嗨罗伯特，你是对的，cy.style() 改变了整个图表的风格。您可能没有注意到的是，您可以非常具体地指定要在哪个元素上执行此功能。

About cytoscape selectors:

If you want to select every element of a specific type, you can call this:
cy.elements(); // this returns all edges and nodes
cy.nodes(); // this returns all nodes
cy.edges(); // this returns all edges
If you want to get a specific group of elements or one in particular, you can perform a query like this:
cy.elements/nodes/edges('[selector =/!= "property"]');   // selector can be id and the property the actual id

解法：

要找到解决方案，您可以执行以下操作：

cy.nodes('[id = "yourId"]').style('background-color', 'desiredColor');

或者将它绑定到一个事件，我知道你的用例是什么：

cy.unbind('click);  // always unbind before binding an event to prevent binding it twiche/multiple times
cy.bind('click', 'node, edge', function(event) {
    let target = event.target;
  if (target.isEdge()) {
    target.style('line-color', 'green');
  } else {
    target.style({
      'background-color': 'white',
      'border-color': 'blue'
    });
  }
});

代码示例：

这是此方法的一个工作示例：

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",
        "background-color": "gray",
        "border-opacity": "1",
        "border-width": "10px"
      }
    },
    {
      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: "hello",
      show: {
        event: event.type,
        ready: true
      },
      hide: {
        event: "mouseout unfocus"
      }
    },
    event
  );
});

cy.unbind('click');
cy.bind('click', 'node, edge', function(event) {
  let target = event.target;
  if (target.isEdge()) {
    target.style('line-color', 'green');
  } else {
    target.style({
      'background-color': 'white',
      'border-color': 'blue'
    });
  }
});

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>

如何更改 Cytoscape.js 网格中单个节点的颜色

How can I change the color an individual node in a grid of Cytoscape.js

javascript

cytoscape.js

解释：

About cytoscape selectors:

解法：

代码示例：