如何获取边缘以及我在 Cytoscape.js 中过滤的节点？

Question

我想知道如何获取边缘以及根据特定查询过滤的所有节点？

我在 Cytoscape.js 页面上看到了这个示例： https: //js.cytoscape.org/#selectors

// get node j and the edges coming out from it
cy.elements('node#j, edge[source = "j"]');

现在我想对所有节点以及所有边都有共同的特定查询属性执行相同的操作。

我按照上面的想法尝试了一个查询，如下所示：

const query = 'node[ nodeType = "Car"]';
graphElements = cy.elements(query);

这给了我所有节点类型为“Car”但没有边缘的节点。如何获取所有边以及选定的节点查询？

Answer 1

为了过滤具有连接边的节点，您可以将函数.remove()与函数一起使用.not()，从而删除不在所提供集合中的每个节点，以及来自和到不在集合中的节点的每条边：

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: ":selected",
      css: {
        "background-color": "black",
        "line-color": "black",
        "target-arrow-color": "black",
        "source-arrow-color": "black"
      }
    }
  ],

  elements: {
    nodes: [{
        data: {
          id: "n0"
        }
      },
      {
        data: {
          id: "n1"
        }
      },
      {
        data: {
          id: "n2"
        }
      },
      {
        data: {
          id: "n3",
          type: "car"
        }
      },
      {
        data: {
          id: "n4"
        }
      },
      {
        data: {
          id: "n5"
        }
      },
      {
        data: {
          id: "n6"
        }
      },
      {
        data: {
          id: "n7"
        }
      },
      {
        data: {
          id: "n8"
        }
      },
      {
        data: {
          id: "n9"
        }
      },
      {
        data: {
          id: "n10"
        }
      },
      {
        data: {
          id: "n11"
        }
      },
      {
        data: {
          id: "n12",
          type: "car"
        }
      },
      {
        data: {
          id: "n13"
        }
      },
      {
        data: {
          id: "n14"
        }
      },
      {
        data: {
          id: "n15"
        }
      },
      {
        data: {
          id: "n16"
        }
      }
    ],
    edges: [{
        data: {
          source: "n0",
          target: "n1"
        }
      },
      {
        data: {
          source: "n1",
          target: "n2"
        }
      },
      {
        data: {
          source: "n1",
          target: "n3"
        }
      },
      {
        data: {
          source: "n2",
          target: "n7"
        }
      },
      {
        data: {
          source: "n2",
          target: "n11"
        }
      },
      {
        data: {
          source: "n2",
          target: "n16"
        }
      },
      {
        data: {
          source: "n3",
          target: "n4"
        }
      },
      {
        data: {
          source: "n3",
          target: "n16"
        }
      },
      {
        data: {
          source: "n4",
          target: "n5"
        }
      },
      {
        data: {
          source: "n4",
          target: "n6"
        }
      },
      {
        data: {
          source: "n6",
          target: "n8"
        }
      },
      {
        data: {
          source: "n8",
          target: "n9"
        }
      },
      {
        data: {
          source: "n8",
          target: "n10"
        }
      },
      {
        data: {
          source: "n11",
          target: "n12"
        }
      },
      {
        data: {
          source: "n12",
          target: "n13"
        }
      },
      {
        data: {
          source: "n13",
          target: "n14"
        }
      },
      {
        data: {
          source: "n13",
          target: "n15"
        }
      }
    ]
  },

  layout: {
    name: "dagre",
    padding: 5
  }
}));

cy.off("click");
cy.on("click", function(event) {
  let filteredNodes = cy.nodes('node[ type = "car"]');
  cy.nodes().not(filteredNodes.union(filteredNodes.successors())).remove();
});

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://cdnjs.cloudflare.com/ajax/libs/cytoscape/3.2.17/cytoscape.min.js"></script>
  <script src="https://unpkg.com/jquery@3.3.1/dist/jquery.js"></script>
  <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>