Question

我是sigma.js的新手，我在Angular 7中使用sigma.js，将邻居方法添加到图中看起来不错。另外，第一次图表看起来不错，但是当我更改路线并再次调用图表页面时，出现了类似ERROR错误的错误：未捕获（承诺）：方法“邻居”已经存在。
我的代码像

sigma.classes.graph.addMethod("neighbors", function(nodeId) {
      var k,
        neighbors = {},
        index = this.allNeighborsIndex[nodeId] || {};

      for (k in index) neighbors[k] = this.nodesIndex[k];

      return neighbors;
    });

    this.s = new sigma({
      graph: this.graph,
      renderer: {
        container: document.getElementById("sigma-container"),
        type: "canvas"
      },
      settings: {
        defaultEdgeType: "line",
        defaultNodeColor: "#aaabaa",
        autoRescale: ["nodePosition", "nodeSize"],
        labelThreshold: 0,
        adjustSizes: true,
        enableEdgeHovering: true,
        edgeHoverColor: "#393a3c",
        defaultEdgeHoverColor: "#393a3c",
        edgeHoverExtremities: true
      }
    });

    this.s.graph.nodes().forEach(function(n) {
      n.originalColor = n.color;
    });
    this.s.graph.edges().forEach(function(e) {
      e.originalColor = e.color;
    });

    this.s.bind("overNode", e => {
      this.createSelectTeamMemberGraph(e);
    });
  }

  public createSelectTeamMemberGraph(user) {
    let e = user;
    var nodeId = user.userId || e.data.node.id,
      toKeep = this.s.graph.neighbors(nodeId);
    toKeep[nodeId] = e || e.data.node;

    this.s.graph.nodes().forEach(function(n) {
      if (toKeep[n.id]) n.color = n.originalColor;
      else n.color = "#aaaaab";
    });

    this.s.graph.edges().forEach(function(e) {
      if (toKeep[e.source] && toKeep[e.target]) e.color = e.originalColor;
      else e.color = "#aaaaab";
    });
    this.s.refresh();
  }

Answer 1

由于sigma js已经加载一次并且添加了名为“ neighbor”的方法，因此会出现此错误。如果将此方法再次添加到sigma js配置中，则会显示此错误“方法已存在”。

解决方法是只调用代码的以下部分：

sigma.classes.graph.addMethod("neighbors", function(nodeId) {
      var k,
        neighbors = {},
        index = this.allNeighborsIndex[nodeId] || {};

      for (k in index) neighbors[k] = this.nodesIndex[k];

      return neighbors;
    });

这可以通过在单独的js文件中编写这部分代码来完成，该文件仅被调用一次。

错误错误：未捕获（承诺）：方法“邻居”已存在

1 个答案: