轻量级流程图控件GoJS示例连载（一）：最小化

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，且极大地简化你的JavaScript / Canvas 程序。

慧都网小编为大家准备了一套完整的GoJS的示例，将以连载的形式展开，供大家学习和交流讨论。

这不是GoJS的真正最小化演示，因为我们确实指定了自定义Node模板，但它非常简单。如果单击链接，示例的完整来源如下所示。

此示例使用Node模板设置Diagram.nodeTemplate，该模板数据绑定文本字符串和形状的填充颜色。

该Diagram.initialContentAlignment设置导致图表内容出现在图的视口的中心。

使用鼠标和常用键盘命令，你可以平移，选择，移动，复制，删除和撤消/重做。在触摸设备上，使用手指作为鼠标，并保持手指静止以显示上下文菜单。默认上下文菜单支持当时为所选对象启用的大多数标准命令。

有关更精细和更有说服力的样本，请参阅基本示例。有关从服务器加载JSON数据的示例，请参阅最小化JSON示例。有关从服务器加载XML数据的示例，请参阅最小化XML示例。

以下为在页面中查看此示例页面的源代码：

  function init() {
    if (window.goSamples) goSamples();  // init for these samples -- you don't need to call this

    var $ = go.GraphObject.make;  // for conciseness in defining templates

    myDiagram = $(go.Diagram, "myDiagramDiv",  // create a Diagram for the DIV HTML element
                  {
                    initialContentAlignment: go.Spot.Center,  // center the content
                    "undoManager.isEnabled": true  // enable undo & redo
                  });

    // define a simple Node template
    myDiagram.nodeTemplate =
      $(go.Node, "Auto",  // the Shape will go around the TextBlock
        $(go.Shape, "RoundedRectangle", { strokeWidth: 0, fill: "white" },
          // Shape.fill is bound to Node.data.color
          new go.Binding("fill", "color")),
        $(go.TextBlock,
          { margin: 8 },  // some room around the text
          // TextBlock.text is bound to Node.data.key
          new go.Binding("text", "key"))
      );

    // but use the default Link template, by not setting Diagram.linkTemplate

    // create the model data that will be represented by Nodes and Links
    myDiagram.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: "Beta", to: "Beta" },
      { from: "Gamma", to: "Delta" },
      { from: "Delta", to: "Alpha" }
    ]);
  }

<div id="sample" deep="0">
  <!-- The DIV for the Diagram needs an explicit size or else we won't see anything.
       This also adds a border to help see the edges of the viewport. -->
  <div id="myDiagramDiv" style="border: solid 1px black; width:400px; height:400px"></div>
  <p>
    This isn't a truly <i>minimal</i> demonstration of <b>GoJS</b>,
    because we do specify a custom Node template, but it's pretty simple.
    The whole source for the sample is shown below if you click on the link.
  </p>
  <p>
    This sample sets the <a>Diagram.nodeTemplate</a>, with a <a>Node</a> template that data binds both the text string and the shape's fill color.
    For an overview of building your own templates and model data, see the <a href="../learn/index.html">Getting Started tutorial.</a>
  </p>
  <p>
    The <a>Diagram.initialContentAlignment</a> setting causes the diagram's contents
    to appear in the center of the diagram's viewport.
  </p>
  <p>
    Using the mouse and common keyboard commands, you can pan, select, move, copy, delete, and undo/redo.
    On touch devices, use your finger to act as the mouse, and hold your finger stationary to bring up a context menu.
    The default context menu supports most of the standard commands that
    are enabled at that time for the selected object.
  </p>
  <p>
    For a more elaborate and capable sample, see the <a href="basic.html">Basic</a> sample.
    For a sample that loads JSON data from the server,
    see the <a href="minimalJSON.html">Minimal JSON</a> sample.
    For a sample that loads XML data from the server,
    see the <a href="minimalXML.html">Minimal XML</a> sample.
  </p>
</div>

以下为在GitHub上查看此示例页面的源代码：

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Minimal GoJS Sample</title>
<meta name="description" content="An almost minimal diagram using a very simple node template and the default link template." />
<!-- Copyright 1998-2018 by Northwoods Software Corporation. -->
<meta charset="UTF-8">
<script src="../release/go.js"></script>
<script src="../assets/js/goSamples.js"></script>  <!-- this is only for the GoJS Samples framework -->
<script id="code">
  function init() {
    if (window.goSamples) goSamples();  // init for these samples -- you don't need to call this
    var $ = go.GraphObject.make;  // for conciseness in defining templates
    myDiagram = $(go.Diagram, "myDiagramDiv",  // create a Diagram for the DIV HTML element
                  {
                    initialContentAlignment: go.Spot.Center,  // center the content
                    "undoManager.isEnabled": true  // enable undo & redo
                  });
    // define a simple Node template
    myDiagram.nodeTemplate =
      $(go.Node, "Auto",  // the Shape will go around the TextBlock
        $(go.Shape, "RoundedRectangle", { strokeWidth: 0, fill: "white" },
          // Shape.fill is bound to Node.data.color
          new go.Binding("fill", "color")),
        $(go.TextBlock,
          { margin: 8 },  // some room around the text
          // TextBlock.text is bound to Node.data.key
          new go.Binding("text", "key"))
      );
    // but use the default Link template, by not setting Diagram.linkTemplate
    // create the model data that will be represented by Nodes and Links
    myDiagram.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: "Beta", to: "Beta" },
      { from: "Gamma", to: "Delta" },
      { from: "Delta", to: "Alpha" }
    ]);
  }
</script>
</head>
<body onload="init()">
<div id="sample">
  <!-- The DIV for the Diagram needs an explicit size or else we won't see anything.
       This also adds a border to help see the edges of the viewport. -->
  <div id="myDiagramDiv" style="border: solid 1px black; width:400px; height:400px"></div>
  <p>
    This isn't a truly <i>minimal</i> demonstration of <b>GoJS</b>,
    because we do specify a custom Node template, but it's pretty simple.
    The whole source for the sample is shown below if you click on the link.
  </p>
  <p>
    This sample sets the <a>Diagram.nodeTemplate</a>, with a <a>Node</a> template that data binds both the text string and the shape's fill color.
    For an overview of building your own templates and model data, see the <a href="../learn/index.html">Getting Started tutorial.</a>
  </p>
  <p>
    The <a>Diagram.initialContentAlignment</a> setting causes the diagram's contents
    to appear in the center of the diagram's viewport.
  </p>
  <p>
    Using the mouse and common keyboard commands, you can pan, select, move, copy, delete, and undo/redo.
    On touch devices, use your finger to act as the mouse, and hold your finger stationary to bring up a context menu.
    The default context menu supports most of the standard commands that
    are enabled at that time for the selected object.
  </p>
  <p>
    For a more elaborate and capable sample, see the <a href="basic.html">Basic</a> sample.
    For a sample that loads JSON data from the server,
    see the <a href="minimalJSON.html">Minimal JSON</a> sample.
    For a sample that loads XML data from the server,
    see the <a href="minimalXML.html">Minimal XML</a> sample.
  </p>
</div>
</body>
</html>

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