cytoscape.js 图的条件样式

Question

我想根据全局 Javascript 变量更改图形的样式。例如，假设我的边得到了name和price属性，我想根据全局label_type变量使边的标签不同：

let lable_type = 'I_want_name_labels'
switch(lable_type) {
  case 'I_want_name_labels':
    cy.style().selector('edge').style({'label': 'data(name)'});
    break;
  case 'I_want_price_labels':
    cy.style().selector('edge').style({'label': 'data(price)'});
    break;
}

上面的代码根本没有做任何事情（没有显示标签），我真的不明白为什么。我的边缘具有以下结构：

{
  "data": {
    "id": "node_node2",
    "source": "node1",
    "target": "node2",
    "directed": true,
    "name": "Baltazar",
    "price": 1095.73
  }
}

---

注意：我尝试使用cy.filter('edge').style({'label': 'data(name)'})，但data似乎无法通过这种方式访问​​，我收到了以下警告：

The style property `label: data(name)` is invalid

---

那么，如何使用 cytoscape.js 获得条件样式？我在这里错过了什么？

Answer 1

这是您正在寻找的线路：

// .data() gets you all properties of the target element, .id() for example directly the id of the element
targetElement.style('label', targetElement.data('faveColor'));

这是一个关于如何初始化然后更改节点/边标签的工作演示：

// .data() gets you all properties of the target element, .id() for example directly the id of the element
targetElement.style('label', targetElement.data('faveColor'));

var cy = (window.cy = cytoscape({
  container: document.getElementById("cy"),

  boxSelectionEnabled: false,
  autounselectify: true,

  style: [{
      selector: "node",
      css: {
        "label": "data(id)",
        "text-valign": "center",
        "text-halign": "center",
        "height": "60px",
        "width": "100px",
        "shape": "rectangle",
        "background-color": "data(faveColor)"
      }
    },
    {
      selector: "edge",
      css: {
        "curve-style": "bezier",
        "control-point-step-size": 40,
        "target-arrow-shape": "triangle"
      }
    }
  ],

  elements: {
    nodes: [{
        data: {
          id: "Top",
          faveColor: "#2763c4",
          wants: "id"
        }
      },
      {
        data: {
          id: "yes",
          faveColor: "#37a32d",
          wants: "id"
        }
      },
      {
        data: {
          id: "no",
          faveColor: "#2763c4",
          wants: "id"
        }
      },
      {
        data: {
          id: "Third",
          faveColor: "#2763c4",
          wants: "color"
        }
      },
      {
        data: {
          id: "Fourth",
          faveColor: "#56a9f7",
          wants: "color"
        }
      }
    ],
    edges: [{
        data: {
          source: "Top",
          target: "yes"
        }
      },
      {
        data: {
          source: "Top",
          target: "no"
        }
      },
      {
        data: {
          source: "no",
          target: "Third"
        }
      },
      {
        data: {
          source: "Third",
          target: "Fourth"
        }
      },
      {
        data: {
          source: "Fourth",
          target: "Third"
        }
      }
    ]
  },
  layout: {
    name: "dagre"
  }
}));

cy.bind('click', 'node, edge', function(event) {
  cy.nodes().each(function(ele, i, eles) {
    ele.style('label', (ele.data('wants') == 'id') ? ele.data('id') : ele.data('faveColor'));
  });
});

body {
  font: 14px helvetica neue, helvetica, arial, sans-serif;
}

#cy {
  height: 85%;
  width: 100%;
  float: right;
  position: absolute;
}