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132
133<h1>Selection</h1>
134<p>
135Users normally select <a>Part</a>s manually by clicking on them and they deselect them by clicking in the background or pressing the Esc key.
136You can select parts programmatically by setting <a>Part.isSelected</a>.
137</p>
138<p>
139Users can also drag in the background in order to select the Parts that are within a rectangular area, via the <a>DragSelectingTool</a>.
140Read more about that in the Introduction to Tools at <a href="tools.html#DragSelectingTool">DragSelectingTool</a>.
141</p>
142<p>
143The <a>Diagram</a> keeps a collection of selected parts, <a>Diagram.selection</a>.
144That collection is read-only -- the only way to select or deselect a Part is by setting its <a>Part.isSelected</a> property.
145You can limit how many parts are selected by setting <a>Diagram.maxSelectionCount</a>.
146Prevent all selection by the user by setting <a>Diagram.allowSelect</a> to false.
147Or prevent a particular Part from being selected by setting <a>Part.selectable</a> to false.
148</p>
149<p>
150You can show that a part is selected by either or both of two general techniques: adding <a>Adornment</a>s or
151changing the appearance of some of the elements in the visual tree of the selected Part.
152</p>
153
154<h2 id="SelectionAdornments">Selection Adornments</h2>
155<p>
156It is common to display that a Part is selected by having it show a selection <a>Adornment</a> when the Part is selected.
157For nodes this is normally a blue rectangle surrounding the whole Node.
158This is the default behavior; if you do not want such an adornment, you can set <a>Part.selectionAdorned</a> to false.
159</p>
160
161<pre class="lang-js" id="adornmentDefault"><code>
diagram.nodeTemplate =
  $(go.Node, "Vertical",
    // the location is the center of the Shape, not the center of the whole Node
    { locationSpot: go.Spot.Center, locationObjectName: "ICON" },
    new go.Binding("location", "loc", go.Point.parse),
    $(go.Shape,
      {
        name: "ICON",
        width: 40, height: 40,
        fill: "gray",
        portId: ""  // the port is this Shape, not the whole Node
      },
      new go.Binding("figure")),
    $(go.TextBlock,
      { margin: new go.Margin(5, 0, 0, 0) },
      new go.Binding("text", "key"))
  );
179
var nodeDataArray = [
  { key: "Alpha", figure: "Club", loc: "0 0" },
  { key: "Beta", figure: "Spade", loc: "200 50" }
];
var linkDataArray = [
  { from: "Alpha", to: "Beta" }
];
diagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);
diagram.commandHandler.selectAll();
189</code></pre>
190<script>goCode("adornmentDefault", 600, 150)</script>
191
192<p>
193By default an <a>Adornment</a> will apply to the whole <a>Node</a>.
194What if you want attention to be drawn only to the main piece of a node?
195You can accomplish that by naming that object and setting <a>Part.selectionObjectName</a> to that name.
196</p>
197<pre class="lang-js" id="adornmentObject"><code>
diagram.nodeTemplate =
  $(go.Node, "Vertical",
    { selectionObjectName: "ICON" },  // added this property!
      // the location is the center of the Shape, not the center of the whole Node
    { locationSpot: go.Spot.Center, locationObjectName: "ICON" },
    new go.Binding("location", "loc", go.Point.parse),
    $(go.Shape,
      {
        name: "ICON",
        width: 40, height: 40,
        fill: "gray",
        portId: ""  // the port is this Shape, not the whole Node
      },
      new go.Binding("figure")),
    $(go.TextBlock,
      { margin: new go.Margin(5, 0, 0, 0) },
      new go.Binding("text", "key"))
  );
216
var nodeDataArray = [
  { key: "Alpha", figure: "Club", loc: "0 0" },
  { key: "Beta", figure: "Spade", loc: "200 50" }
];
var linkDataArray = [
  { from: "Alpha", to: "Beta" }
];
diagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);
diagram.selectCollection(diagram.nodes);
226</code></pre>
227<script>goCode("adornmentObject", 600, 150)</script>
228<p>
229Note how the <a>Part.selectionObjectName</a> property is similar to the <a>Part.locationObjectName</a>
230in helping to treat a node as if only one piece of it really mattered.
231</p>
232
233<h3 id="CustomSelectionAdornments">Custom Selection Adornments</h3>
234<p>
235If you do want a selection adornment but want something different than the standard one, you can customize it.
236Such customization can be done by setting the <a>Part.selectionAdornmentTemplate</a>.
237In this example, nodes get thick blue rounded rectangles surrounding the selected node,
238and links get thick blue lines following the selected link's path.
239</p>
240<pre class="lang-js" id="custom"><code>
diagram.nodeTemplate =
  $(go.Node, "Auto",
    new go.Binding("location", "loc", go.Point.parse),
    $(go.Shape, "RoundedRectangle", { fill: "lightgray" }),
    $(go.TextBlock,
      { margin: 5 },
      new go.Binding("text", "key")),
    {
      selectionAdornmentTemplate:
        $(go.Adornment, "Auto",
          $(go.Shape, "RoundedRectangle",
          { fill: null, stroke: "dodgerblue", strokeWidth: 8 }),
          $(go.Placeholder)
        )  // end Adornment
    }
  );
257
diagram.linkTemplate =
  $(go.Link,
    $(go.Shape, { strokeWidth: 2 }),
    $(go.Shape, { toArrow: "Standard" }),
    {
      selectionAdornmentTemplate:
        $(go.Adornment,
          $(go.Shape,
            { isPanelMain: true, stroke: "dodgerblue", strokeWidth: 8 }),
          $(go.Shape,
            { toArrow: "Standard", fill: "dodgerblue", stroke: null, scale: 2.5 })
        )  // end Adornment
    }
  );
272
var nodeDataArray = [
  { key: "Alpha", loc: "0 0" },
  { key: "Beta", loc: "200 50" }
];
var linkDataArray = [
  { from: "Alpha", to: "Beta" }
];
diagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);
diagram.commandHandler.selectAll();
282</code></pre>
283<script>goCode("custom", 600, 100)</script>
284<p>
285Note that an <a>Adornment</a> is just a <a>Part</a>.
286Adornments for nodes must contain a <a>Placeholder</a> in their visual tree.
287The Placeholder gets positioned where the selected object is.
288</p>
289<p>
290Adornments for links are assumed to be panels of <a>Panel.type</a> that is <a>Panel,Link</a>.
291Hence the main element may be a <a>Shape</a> that gets the geometry of the selected Link's path shape,
292and the other elements of the adornment may be positioned on or near the segments of the link route just as for a regular <a>Link</a>.
293</p>
294
295<h3 id="MoreComplexAdornments">More Complex Adornments</h3>
296<p>
297The custom <a>Adornment</a> for a <a>Node</a> need not be only a simple <a>Shape</a> outlining the selected node.
298Here is an adornment that adds a button to the adornment which inserts a node and a link to that new node.
299</p>
300<pre class="lang-js" id="complex"><code>
function addNodeAndLink(e, b) {
  // take a button panel in an Adornment, get its Adornment, and then get its adorned Node
  var node = b.part.adornedPart;
  // we are modifying the model, so conduct a transaction
  var diagram = node.diagram;
  diagram.startTransaction("add node and link");
  // have the Model add the node data
  var newnode = { key: "N" };
  diagram.model.addNodeData(newnode);
  // locate the node initially where the parent node is
  diagram.findNodeForData(newnode).location = node.location;
  // and then add a link data connecting the original node with the new one
  var newlink = { from: node.data.key, to: newnode.key };
  diagram.model.addLinkData(newlink);
  // finish the transaction -- will automatically perform a layout
  diagram.commitTransaction("add node and link");
}
318
diagram.nodeTemplate =
  $(go.Node, "Auto",
    $(go.Shape, "RoundedRectangle", { fill: "lightgray" }),
    $(go.TextBlock,
      { margin: 5 },
      new go.Binding("text", "key")),
    {
      selectionAdornmentTemplate:
        $(go.Adornment, "Spot",
          $(go.Panel, "Auto",
            // this Adornment has a rectangular blue Shape around the selected node
            $(go.Shape, { fill: null, stroke: "dodgerblue", strokeWidth: 3 }),
            $(go.Placeholder)
          ),
          // and this Adornment has a Button to the right of the selected node
          $("Button",
            { alignment: go.Spot.Right, alignmentFocus: go.Spot.Left,
              click: addNodeAndLink },  // define click behavior for Button in Adornment
            $(go.TextBlock, "ADD",  // the Button content
              { font: "bold 6pt sans-serif" })
          )
        )  // end Adornment
    }
  );
343
diagram.layout = $(go.TreeLayout);
345
var nodeDataArray = [
  { key: "Alpha" },
  { key: "Beta" }
];
var linkDataArray = [
  { from: "Alpha", to: "Beta" }
];
diagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);
diagram.select(diagram.findNodeForKey("Beta"));
355</code></pre>
356<script>goCode("complex", 600, 200)</script>
357<p>
358Select any node and click the "ADD" button.
359Note how the diagram is automatically laid out as a tree.
360</p>
361
362<h3 id="DataBinding">Data Binding</h3>
363<p>
364Like all <a>Part</a>s, <a>Adornment</a>s support data binding.
365If the adorned Part has a data binding (i.e. if <a>Part.data</a> is non-null),
366all adornments for that part will also be bound to the same data object.
367</p>
368<pre class="lang-js" id="binding"><code>
diagram.nodeTemplate =
  $(go.Node, "Auto",
    new go.Binding("location", "loc", go.Point.parse),
    $(go.Shape, "RoundedRectangle", { fill: "lightgray", strokeWidth: 2 },
      new go.Binding("stroke", "color")),
    $(go.TextBlock,
      { margin: 5 },
      new go.Binding("text", "key")),
    {
      selectionAdornmentTemplate:
        $(go.Adornment, "Auto",
          $(go.Shape,
            { fill: null, stroke: "dodgerblue", strokeWidth: 6 },
            new go.Binding("stroke", "color")),
          $(go.Placeholder)
        )  // end Adornment
    }
  );
387
var nodeDataArray = [
  { key: "Alpha", loc: "0 0", color: "blue" },
  { key: "Beta", loc: "200 50", color: "red" }
];
var linkDataArray = [
  { from: "Alpha", to: "Beta" }
];
diagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);
diagram.selectCollection(diagram.nodes);
397</code></pre>
398<script>goCode("binding", 600, 100)</script>
399<p>
400Notice how each Adornment has the same color as the selected node's data.color.
401</p>
402
403<h2 id="SelectionAppearanceChanges">Selection Appearance changes</h2>
404<p>
405Adding a selection adornment is not the only way to indicate visually that a <a>Part</a> is selected.
406You can also modify the appearance of one or more objects in your Part.
407</p>
408<p>
409One way to do this is with data binding.
410Here we data bind the <a>Shape.fill</a> to the <a>Part.isSelected</a> property
411with a converter function that converts the boolean value to a color string or brush.
412We also turn off the regular rectangular blue selection adornment.
413</p>
414<pre class="lang-js" id="isSelected"><code>
diagram.nodeTemplate =
  $(go.Node, "Auto",
    { selectionAdorned: false },  // don't bother with any selection adornment
    new go.Binding("location", "loc", go.Point.parse),
    $(go.Shape, "RoundedRectangle", { fill: "lightgray", strokeWidth: 2 },
      // when this Part.isSelected changes value, change this Shape.fill value:
      new go.Binding("fill", "isSelected", function(sel) {
        if (sel) return "cyan"; else return "lightgray";
      }).ofObject("")),  // The object named "" is the root visual element, the Node itself
    $(go.TextBlock,
      { margin: 5 },
      new go.Binding("text", "key"))
  );
428
var nodeDataArray = [
  { key: "Alpha", loc: "0 0" },
  { key: "Beta", loc: "200 50" }
];
var linkDataArray = [
  { from: "Alpha", to: "Beta" }
];
diagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);
diagram.select(diagram.findNodeForKey("Beta"));
438</code></pre>
439<script>goCode("isSelected", 600, 100)</script>
440<p>
441Now when you select a node its background color changes to cyan.
442</p>
443
444<p>
445More generally you can execute code to modify the Part when <a>Part.isSelected</a> has changed value.
446In this example we will have the same side effects as the previous example.
447</p>
448<pre class="lang-js" id="selectionChanged"><code>
function onSelectionChanged(node) {
  var icon = node.findObject("Icon");
  if (icon !== null) {
    if (node.isSelected)
      icon.fill = "cyan";
    else
      icon.fill = "lightgray";
  }
}
458
diagram.nodeTemplate =
  $(go.Node, "Auto",
    { selectionAdorned: false,  // don't bother with any selection adornment
      selectionChanged: onSelectionChanged },  // executed when Part.isSelected has changed
    new go.Binding("location", "loc", go.Point.parse),
    $(go.Shape, "RoundedRectangle",
      { name: "Icon", fill: "lightgray", strokeWidth: 2 }),
    $(go.TextBlock,
      { margin: 5 },
      new go.Binding("text", "key"))
  );
470
var nodeDataArray = [
  { key: "Alpha", loc: "0 0" },
  { key: "Beta", loc: "200 50" }
];
var linkDataArray = [
  { from: "Alpha", to: "Beta" }
];
diagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);
diagram.select(diagram.findNodeForKey("Beta"));
480</code></pre>
481<script>goCode("selectionChanged", 600, 100)</script>
482<p>
483There are some restrictions on what you can do in such an event handler:
484you should not select or deselect any parts, and you should not add or remove any parts from the diagram.
485</p>
486
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                target="_blank" rel="noopener" onclick="getOutboundLink('https://www.nwoods.com/contact.html', 'contact');">Contact</a>
              </li>
              <li>
                <a href="https://forum.nwoods.com/c/gojs">Forum</a>
              </li>
              <li>
                <a href="https://www.nwoods.com/app/activate.aspx?sku=gojs">Activate</a>
              </li>
              <li>
                <a href="https://www.nwoods.com/sales/index.html"
                target="_blank" rel="noopener" onclick="getOutboundLink('https://www.nwoods.com/sales/index.html', 'buy');">Buy</a>
              </li>
              <li>
                <a href="https://www.youtube.com/channel/UC9We8EoX596-6XFjJDtZIDg">Videos</a>
              </li>
            </ul>
          </li>
          <li class="list-none row-span-2">
            <h2 class="text-base font-semibold tracking-wide">Company</h2>
            <ul class="list-none space-y-4 md:space-y-1 px-0">
              <li>
                <a href="https://www.nwoods.com">Northwoods</a>
              </li>
              <li>
                <a href="https://www.nwoods.com/about.html">About Us</a>
              </li>
              <li>
                <a href="https://www.nwoods.com/contact.html">Contact Us</a>
              </li>
              <li>
                <a href="https://twitter.com/northwoodsgo">Twitter</a>
              </li>
560
            </ul>
          </li>
        </ul>
564
565
    <p class="text-sm text-gray-100 md:mb-6">
      Copyright 1998-2021 <a class="text-white" href="https://www.nwoods.com">Northwoods Software</a>
    </p>
  </div>
</div>
571</footer>  </body>
572
573<script async src="https://www.googletagmanager.com/gtag/js?id=UA-1506307-5"></script> 
574<script>
window.dataLayer = window.dataLayer || [];
function gtag(){dataLayer.push(arguments);}
gtag('js', new Date()); gtag('config', 'UA-1506307-5');
var getOutboundLink = function(url, label) {
  gtag('event', 'click', {
    'event_category': 'outbound',
    'event_label': label,
    'transport_type': 'beacon'
  });
}
585
// topnav
var topButton = document.getElementById("topnavButton");
var topnavList = document.getElementById("topnavList");
topButton.addEventListener("click", function() {
  this.classList.toggle("active");
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  document.getElementById("topnavClosed").classList.toggle("hidden");
});
595</script>
<script src="../assets/js/prism.js"></script>
<script src="../release/go.js"></script>
598<script src="../extensions/Figures.js"></script>  <script src="../assets/js/goDoc.js"></script>
<script>
  document.addEventListener("DOMContentLoaded", function() {
    if (window.go) document.getElementById('version').textContent = "GoJS version " + go.version;
    if (window.goDoc) window.goDoc();
    var d = window.diagrams;
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      var dargs = d[i];
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</script>
611</html>
1	`<!DOCTYPE html>`
2	`<html lang="en">`
3	`<head>`
4	`<meta charset="utf-8"/>`
5	`<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no, viewport-fit=cover"/>`
6
7	`<link rel="stylesheet" href="../assets/css/style.css"/>`
8	`<!-- Copyright 1998-2021 by Northwoods Software Corporation. --> <title> GoJS Selection -- Northwoods Software </title>`
9	`<link rel="stylesheet" href="../assets/css/prism.css" />`
10	`</head>`
11	`<script>`
12
13	`window.diagrams = [];`
14	`window.goCode = function(pre, w, h, parentid, animation) {`
15	`window.diagrams.push([pre, w, h, parentid, animation]);`
16	`}`
17	`</script>`
18	`<body>`
19	`<nav id="navTop" class="w-full z-30 top-0 text-white bg-nwoods-primary">`
20	`<div class="w-full container max-w-screen-lg mx-auto flex flex-wrap sm:flex-nowrap items-center justify-between mt-0 py-2">`
21	`<div class="md:pl-4">`
22	`<a class="text-white hover:text-white no-underline hover:no-underline`
23	`font-bold text-2xl lg:text-4xl rounded-lg hover:bg-nwoods-secondary " href="../">`
24	`<h1 class="mb-0 p-1 ">GoJS</h1>`
25	`</a>`
26	`</div>`
27	`<button id="topnavButton" class="rounded-lg sm:hidden focus:outline-none focus:ring" aria-label="Navigation">`
28	`<svg fill="currentColor" viewBox="0 0 20 20" class="w-6 h-6">`
29	`<path id="topnavOpen" fill-rule="evenodd" d="M3 5a1 1 0 011-1h12a1 1 0 110 2H4a1 1 0 01-1-1zM3 10a1 1 0 011-1h12a1 1 0 110 2H4a1 1 0 01-1-1zM9 15a1 1 0 011-1h6a1 1 0 110 2h-6a1 1 0 01-1-1z" clip-rule="evenodd"></path>`
30	`<path id="topnavClosed" class="hidden" fill-rule="evenodd" d="M4.293 4.293a1 1 0 011.414 0L10 8.586l4.293-4.293a1 1 0 111.414 1.414L11.414 10l4.293 4.293a1 1 0 01-1.414 1.414L10 11.414l-4.293 4.293a1 1 0 01-1.414-1.414L8.586 10 4.293 5.707a1 1 0 010-1.414z" clip-rule="evenodd"></path>`
31	`</svg>`
32	`</button>`
33	`<div id="topnavList" class="hidden sm:block items-center w-auto mt-0 text-white p-0 z-20">`
34	`<ul class="list-reset list-none font-semibold flex justify-end flex-wrap sm:flex-nowrap items-center px-0 pb-0">`
35	`<li class="p-1 sm:p-0"><a class="topnav-link" href="../learn/">Learn</a></li>`
36	`<li class="p-1 sm:p-0"><a class="topnav-link" href="../samples/">Samples</a></li>`
37	`<li class="p-1 sm:p-0"><a class="topnav-link" href="../intro/">Intro</a></li>`
38	`<li class="p-1 sm:p-0"><a class="topnav-link" href="../api/">API</a></li>`
39	`<li class="p-1 sm:p-0"><a class="topnav-link" href="https://www.nwoods.com/products/register.html">Register</a></li>`
40	`<li class="p-1 sm:p-0"><a class="topnav-link" href="../download.html">Download</a></li>`