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GoJS是一款功能强大，快速且轻量级的流程图控件，可帮助你在JavaScript 和HTML5 Canvas程序中创建流程图，且极大地简化您的JavaScript / Canvas 程序。

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使用Diagram.requestUpdate调整Div的大小

以下示例具有一个按钮，该按钮可放大图的div。单击时，将明显调整div的大小，但图保持不变。

    // A minimal Diagram
    diagram.nodeTemplate =
      $(go.Node, "Auto",
        $(go.Shape, "RoundedRectangle",
          new go.Binding("fill", "color")),
        $(go.TextBlock,
          { margin: 3 },  // some room around the text
          new go.Binding("text", "key"))
      );

    diagram.model = new go.GraphLinksModel(
    [
      { key: "Alpha", color: "lightblue" },
      { key: "Beta", color: "orange" },
      { key: "Gamma", color: "lightgreen" },
      { key: "Delta", color: "pink" }
    ],
    [
      { from: "Alpha", to: "Beta" },
      { from: "Alpha", to: "Gamma" },
      { from: "Gamma", to: "Delta" },
      { from: "Delta", to: "Alpha" }
    ]);

    // Resize the diagram with this button
    var button1 = document.getElementById('button1');
    button1.addEventListener('click', function() {
      var div = diagram.div;
      div.style.width = '200px';
    });

 通常，我们会希望在div调整大小的同时，将Diagram调整为其div的大小。为此，我们在调整div的大小后向Diagram.requestUpdate 添加了一个调用。这将检查图的div是否已更改大小，如果已更改，则以适当的新尺寸重新绘制图。

除了添加了对Diagram.requestUpdate的调用之外，以下代码几乎相同。

    // A minimal Diagram
    diagram.nodeTemplate =
      $(go.Node, "Auto",
        $(go.Shape, "RoundedRectangle",
          new go.Binding("fill", "color")),
        $(go.TextBlock,
          { margin: 3 },  // some room around the text
          new go.Binding("text", "key"))
      );

    diagram.model = new go.GraphLinksModel(
    [
      { key: "Alpha", color: "lightblue" },
      { key: "Beta", color: "orange" },
      { key: "Gamma", color: "lightgreen" },
      { key: "Delta", color: "pink" }
    ],
    [
      { from: "Alpha", to: "Beta" },
      { from: "Alpha", to: "Gamma" },
      { from: "Gamma", to: "Delta" },
      { from: "Delta", to: "Alpha" }
    ]);

    // Resize the diagram with this button
    var button2 = document.getElementById('button2');
    button2.addEventListener('click', function() {
      var div = diagram.div;
      div.style.width = '200px';
      diagram.requestUpdate(); // Needed!
    });

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