有条件地更改链接颜色？

Question

我试图根据模型数据中的键/值对更改 GoJS 树中的链接颜色（color在本例中为 ）。我试图通过执行以下操作来调用我的方法来更改链接颜色：  myDiagram.linkTemplate =    $(go.Link,      { routing: go.Link.Orthogonal, corner: 5, toShortLength: -2, fromShortLength: -2 },      $(go.Shape, { strokeWidth: 2, stroke: colors["gray"] },      new go.Binding("geometry", "color", setLinkColor))); // the link shape and color但是，我的setLinkColor方法从未被调用。这里是供参考：  function setLinkColor(color) {    console.log("value of color: ", color);    switch(color) {      case "critical":        link = go.Shape.stroke(colors["orange"]);        break;      default:        link = go.Shape.stroke(colors["white"]);    }     return link;     }如何根据 的值有条件地为链接着色color？更新我曾尝试按如下方式实施 Walter 的建议：  var linkColors = {true: colors["orange"], false: colors["white"]};  myDiagram.linkTemplate =  $(go.Link,    $(go.Shape, { strokeWidth: 2 },      new go.Binding("stroke", "critical", function(c) { return linkColors[c] || colors["orange"]; })),    $(go.Shape, { toArrow: "OpenTriangle", strokeWidth: 2 },      new go.Binding("stroke", "critical", function(c) { return linkColors[c] || colors["orange"]; })), myDiagram.model = new go.GraphLinksModel(        [          { key: 2, geo: "thing1", color: colors["white"], critical: false },          { key: 3, geo: "thing2", color: "#F47321", critical: true },          { key: 4, geo: "thing3", color: colors["white"], critical: false },          { key: 5, geo: "thing4", color: colors["white"], critical: false },但是，这仍然没有为链接着色，我做错了什么？

Answer 1

 function init() {

    var $ = go.GraphObject.make;

    myDiagram =

      $(go.Diagram, "myDiagramDiv",

          { "undoManager.isEnabled": true });

    myDiagram.nodeTemplate =

      $(go.Node, "Auto",

        $(go.Shape, { fill: "white", portId: "" },

          new go.Binding("fill", "color")),

        $(go.TextBlock, { margin: 8 },

          new go.Binding("text"))

      );

    var myColors = { "A": "red", "B": "green", "C": "blue" };

    myDiagram.linkTemplate =

      $(go.Link,

        $(go.Shape, { strokeWidth: 2 },

          new go.Binding("stroke", "color", function(c) { return myColors[c] || "blue"; })),

        $(go.Shape, { toArrow: "OpenTriangle", strokeWidth: 2 },

          new go.Binding("stroke", "color", function(c) { return myColors[c] || "blue"; }))

      );

    myDiagram.model = new go.GraphLinksModel(

    [

      { key: 1, text: "Alpha", color: "lightblue" },

      { key: 2, text: "Beta", color: "orange" },

      { key: 3, text: "Gamma", color: "lightgreen" },

      { key: 4, text: "Delta", color: "pink" }

    ],

    [

      { from: 1, to: 2, color: "A" },

      { from: 1, to: 3, color: "B" },

      { from: 2, to: 2 },

      { from: 3, to: 4, color: "C" },

      { from: 4, to: 1, color: "D" }

    ]);

  }

  function test() {

    myDiagram.model.commit(function(m) {

      m.set(m.linkDataArray[0], "color", "B");

    });

  }

链接模板显示了一种将链接路径的笔触颜色绑定data.color到myColors对象中CSS 颜色的链接属性查找值的方法。

该test函数显示了一种修改第一个链接颜色的方法。更多讨论在https://gojs.net/latest/learn/graphObject.html