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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <title>GoJS® TreeModel Class</title> <script src="../../assets/js/jquery.min.js"></script> <script src="../../assets/js/bootstrap.min.js"></script> <script src="../../assets/js/highlight.js"></script> <script src="../../assets/js/api.js"></script> <script src="../../assets/js/fuse.min.js"></script> <link href="../../assets/css/bootstrap.min.css" rel="stylesheet" >  <link href="../../assets/css/main.css" rel="stylesheet" type="text/css"/> <link href="../../assets/css/api.css" rel="stylesheet" type="text/css"/>  <link rel="stylesheet" href="../../assets/css/highlight.css" type="text/css" media="all" /> </head> <body>  <nav id="non-fixed-nav" class="navbar navbar-inverse navbar-top"> <div class="container-fluid"> <div class="navbar-header"> <div class="navheader-container"> <div class="navheader-collapse" data-toggle="collapse" data-target="#navbar"> <a id="toplogo" 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class="table-cell" id="apisearch" data-base="../"> <div class="title">Search API</div> <div class="field"> <label for="search-field" class="search-icon"></label> <input id="search-field" type="text" /> </div> <ul class="results"> <li class="state loading">Preparing search index...</li> <li class="state failure">The search index is not available</li> </ul> </div> <div class="table-cell" id="apisumm"> <input type="checkbox" id="showsumms" /> <label class="apisumms" for="showsumms">Show Summaries</label> </div> </div> </div>  <div id="header" class="fineprint"> <b>GoJS</b>® Diagramming Components<br/>version 1.8.36 for JavaScript/HTML<br/>by <a href="https://www.nwoods.com/">Northwoods Software®</a> </div>  <h2 class="classTitle"> Class TreeModel </h2>  <p class="classsummary"> <span class="extends"> Extends <a href="../symbols/Model.html" class="linkConstructor">Model</a>.</span> TreeModels support tree-structured graphs of nodes and links. Each node can have at most one "tree parent"; cycles are not permitted. The reference to the parent node's key is a property of the child node data. <p> TreeModels, unlike <a href="../symbols/GraphLinksModel.html" class="linkConstructor">GraphLinksModel</a>s, do not support arbitrary link relationships between nodes, nor is there a separate link data object for each parent-child relationship. Furthermore there is no support for grouping or label nodes. <p> The <a href="../symbols/TreeModel.html#nodeParentKeyProperty" class="linkProperty">nodeParentKeyProperty</a> property names the property on the node data whose value is the key of the "tree parent" node. The default value for this property is "parent". <p> For example, one can define a graph consisting of one parent node with two child nodes: <pre class="javascript"> model.nodeDataArray = [ { key: "Alpha" }, { key: "Beta", parent: "Alpha" }, { key: "Gamma", parent: "Alpha" } ]; </pre> <p> If you need to show a more complicated graph structure than a tree, use a <a href="../symbols/GraphLinksModel.html" class="linkConstructor">GraphLinksModel</a>. If you want to have multiple links between the same pair of nodes, or if you want to associate more information with each link and cannot put the information on the child node, you will need to have a separate link data object for each link, and that would require the use of <a href="../symbols/GraphLinksModel.html" class="linkConstructor">GraphLinksModel</a>. </p>  <h2 id="constructor" class="summaryCaption"> Constructor <span class="nodetails"> Summary</span><span class="details"> Details</span></h2> <div class="table-responsive"> <table class="summaryTable table table-bordered table-condensed" summary="A summary of the constructor documented in the class TreeModel."> <thead> <tr> <th scope="col" class="name">Name</th> <th scope="col" class="description">Description</th> </tr> </thead> <tbody> <tr> <td class="name" > <div class="name"> TreeModel(nodedataarray) </div> </td> <td class="description"> <div class="description"> <p><p>This constructs an empty TreeModel unless one provides arguments as the initial data array values for the <a href="../symbols/Model.html#nodeDataArray" class="linkProperty">Model.nodeDataArray</a> property.<span class="nodetails" id="xconTreeModel"><a class="morelink" onclick="hst('conTreeModel')">More...</a></span> <span class="details" id="conTreeModel"></span> <dl class="detailList"> <dt class="heading">Parameters:</dt> <dt> <span class="light fixedFont">{Array.<Object>=}</span> <b>nodedataarray</b> </dt> <dd>an optional Array containing JavaScript objects to be represented by Nodes.</dd> </dl> </div> </td> </tr> </tbody> </table> </div>  <h2 class="summaryCaption">Properties<span class="nodetails"> Summary</span><span class="details"> Details</span></h2> <div class="table-responsive"> <table class="summaryTable table table-bordered table-condensed" summary="A summary of the properties documented in the class TreeModel."> <thead> <tr> <th scope="col" class="name">Name, Value Type</th> <th scope="col" class="description">Description</th> </tr> </thead> <tbody> <tr id="nodeParentKeyProperty" > <td class="name"> <div class="name"> nodeParentKeyProperty </div> <div class="attributes"> <span class="light">{string|function(Object,(string|number)=):(string|number)}</span> </div> </td> <td class="description"> <div class="description">  <p>Gets or sets the name of the property on node data that specifies the string or number key of the node data that acts as the "parent" for this "child" node data.<span class="nodetails" id="xpropnodeParentKeyProperty"><a class="morelink" onclick="hst('propnodeParentKeyProperty')">More...</a></span> <span class="details" id="propnodeParentKeyProperty"> The value may also be a function taking two arguments, where the first argument will be a node data object. If the second argument is not supplied, the function should return the string or number key for the parent node data object of which the given data object is a child; if the second argument is supplied, the function should modify the node data object so that it has that new key (which may be undefined to refer to no node) as the parent key for that node.. The default value is the name 'parent', meaning that it expects the data to have a property named 'parent' if the node wants to refer to the parent node by its key. The value must not be null nor an empty string. </span><div class="details" id="dpropnodeParentKeyProperty"><p> If you want to set this property you must do so before using the model, and especially before you assign <a href="../symbols/Diagram.html#model" class="linkProperty">Diagram.model</a>. Note that functions cannot be serialized into JSON-formatted text, so if you are using <a href="../symbols/Model.html#toJson" class="linkMethod">toJson</a> and <a href="../symbols/Model.html#.fromJson" class="linkStatic">Model.fromJson</a>, and if you want this property to be a function, you will need to assign this property to your desired function immediately after creating the model, including when it is created by <a href="../symbols/Model.html#.fromJson" class="linkStatic">Model.fromJson</a>.</div> <div class="seealso">See also: <ul class="seealsolist"> <li><a href="../symbols/TreeModel.html#getParentKeyForNodeData" class="linkMethod">getParentKeyForNodeData</a></li> <li><a href="../symbols/TreeModel.html#setParentKeyForNodeData" class="linkMethod">setParentKeyForNodeData</a></li> </ul> </div> </div> </td> </tr> <tr id="parentLinkCategoryProperty" > <td class="name"> <div class="name"> parentLinkCategoryProperty </div> <div class="attributes"> <span class="light">{string|function(Object,string=):string}</span> </div> </td> <td class="description"> <div class="description">  <p>Gets or sets the name of the data property that returns a string describing that node data's parent link's category.<span class="nodetails" id="xpropparentLinkCategoryProperty"><a class="morelink" onclick="hst('propparentLinkCategoryProperty')">More...</a></span> <span class="details" id="propparentLinkCategoryProperty"> The value may also be a function taking two arguments, where the first argument will be a node data object. If the second argument is not supplied, the function should return the category name for any parent link; if the second argument is supplied, the function should modify the node data object so that its parent link has that new category name. The default value is the name 'parentLinkCategory'. This is used by the diagram to distinguish between different kinds of links. The name must not be null. If the value is an empty string, <a href="../symbols/TreeModel.html#getParentLinkCategoryForNodeData" class="linkMethod">getParentLinkCategoryForNodeData</a> will return an empty string for all node data objects. </span><div class="details" id="dpropparentLinkCategoryProperty"><p> If you want to set this property you must do so before using the model, and especially before you assign <a href="../symbols/Diagram.html#model" class="linkProperty">Diagram.model</a>. Note that functions cannot be serialized into JSON-formatted text, so if you are using <a href="../symbols/Model.html#toJson" class="linkMethod">toJson</a> and <a href="../symbols/Model.html#.fromJson" class="linkStatic">Model.fromJson</a>, and if you want this property to be a function, you will need to assign this property to your desired function immediately after creating the model, including when it is created by <a href="../symbols/Model.html#.fromJson" class="linkStatic">Model.fromJson</a>.</div> <div class="seealso">See also: <ul class="seealsolist"> <li><a href="../symbols/TreeModel.html#getParentLinkCategoryForNodeData" class="linkMethod">getParentLinkCategoryForNodeData</a></li> <li><a href="../symbols/TreeModel.html#setParentLinkCategoryForNodeData" class="linkMethod">setParentLinkCategoryForNodeData</a></li> </ul> </div> </div> </td> </tr> </tbody> </table> </div> <dl class="inheritsList"> <dt>Properties borrowed from class <a href="../symbols/Model.html" class="linkConstructor">Model</a>: </dt><dd><a href="../symbols/Model.html#copiesArrayObjects" class="linkProperty">copiesArrayObjects</a>, <a href="../symbols/Model.html#copiesArrays" class="linkProperty">copiesArrays</a>, <a href="../symbols/Model.html#copyNodeDataFunction" class="linkProperty">copyNodeDataFunction</a>, <a href="../symbols/Model.html#dataFormat" class="linkProperty">dataFormat</a>, <a href="../symbols/Model.html#isReadOnly" class="linkProperty">isReadOnly</a>, <a href="../symbols/Model.html#makeUniqueKeyFunction" class="linkProperty">makeUniqueKeyFunction</a>, <a href="../symbols/Model.html#modelData" class="linkProperty">modelData</a>, <a href="../symbols/Model.html#name" class="linkProperty">name</a>, <a href="../symbols/Model.html#nodeCategoryProperty" class="linkProperty">nodeCategoryProperty</a>, <a href="../symbols/Model.html#nodeDataArray" class="linkProperty">nodeDataArray</a>, <a href="../symbols/Model.html#nodeKeyProperty" class="linkProperty">nodeKeyProperty</a>, <a href="../symbols/Model.html#skipsUndoManager" class="linkProperty">skipsUndoManager</a>, <a href="../symbols/Model.html#undoManager" class="linkProperty">undoManager</a></dd> </dl>  <h2 class="summaryCaption">Method <span class="nodetails"> Summary</span><span class="details"> Details</span></h2> <div class="table-responsive"> <table class="summaryTable table table-bordered table-condensed" summary="A summary of the methods documented in the class TreeModel."> <thead> <tr> <th scope="col" class="name">Name, Return Type</th> <th scope="col" class="description">Description</th> </tr> </thead> <tbody> <tr id="copyNodeData"> <td class="name"> <div class="name"> copyNodeData(nodedata) </div> <div class="attributes"> <span class="light">{Object}</span> </div> </td> <td class="description"> <div class="description"> <p><p>This override also makes sure any copied node data does not have a reference to a parent node.<span class="nodetails" id="xmethcopyNodeData"><a class="morelink" onclick="hst('methcopyNodeData')">More...</a></span> <span class="details" id="methcopyNodeData"></span> </p><div class="seealso">See also: <ul class="seealsolist"> <li><a href="../symbols/Model.html#copyNodeData" class="linkMethod">Model.copyNodeData</a></li> </ul></div> <dl class="detailList"> <dt class="heading">Parameters:</dt> <dt> <span class="light fixedFont">{Object}</span> <b>nodedata</b> </dt> <dd>a JavaScript object represented by a node, group, or non-link.</dd> </dl> <dl class="detailList"> <dt class="heading">Returns:</dt> <dt><span class="light fixedFont">{Object}</span> </dt> </dl> </div> </td> </tr> <tr id="getParentKeyForNodeData"> <td class="name"> <div class="name"> getParentKeyForNodeData(nodedata) </div> <div class="attributes"> <span class="light">{string|number|undefined}</span> </div> </td> <td class="description"> <div class="description"> <p><p>If there is a parent node for the given node data, return the parent's key.<span class="nodetails" id="xmethgetParentKeyForNodeData"><a class="morelink" onclick="hst('methgetParentKeyForNodeData')">More...</a></span> <span class="details" id="methgetParentKeyForNodeData"></span> </p><div class="seealso">See also: <ul class="seealsolist"> <li><a href="../symbols/TreeModel.html#nodeParentKeyProperty" class="linkProperty">nodeParentKeyProperty</a></li> <li><a href="../symbols/TreeModel.html#setParentKeyForNodeData" class="linkMethod">setParentKeyForNodeData</a></li> </ul></div> <dl class="detailList"> <dt class="heading">Parameters:</dt> <dt> <span class="light fixedFont">{Object}</span> <b>nodedata</b> </dt> <dd>a JavaScript object represented by a node.</dd> </dl> <dl class="detailList"> <dt class="heading">Returns:</dt> <dt><span class="light fixedFont">{string|number|undefined}</span> This returns undefined if there is no parent node data object.</dt> </dl> </div> </td> </tr> <tr id="getParentLinkCategoryForNodeData"> <td class="name"> <div class="name"> getParentLinkCategoryForNodeData(childdata) </div> <div class="attributes"> <span class="light">{string}</span> </div> </td> <td class="description"> <div class="description"> <p><p>Find the category for the parent link of a given child node data, a string naming the link template that the <a href="../symbols/Diagram.html" class="linkConstructor">Diagram</a> should use to represent the link.<span class="nodetails" id="xmethgetParentLinkCategoryForNodeData"><a class="morelink" onclick="hst('methgetParentLinkCategoryForNodeData')">More...</a></span> <span class="details" id="methgetParentLinkCategoryForNodeData"></span> </p><div class="seealso">See also: <ul class="seealsolist"> <li><a href="../symbols/TreeModel.html#parentLinkCategoryProperty" class="linkProperty">parentLinkCategoryProperty</a></li> <li><a href="../symbols/TreeModel.html#setParentLinkCategoryForNodeData" class="linkMethod">setParentLinkCategoryForNodeData</a></li> </ul></div> <dl class="detailList"> <dt class="heading">Parameters:</dt> <dt> <span class="light fixedFont">{Object}</span> <b>childdata</b> </dt> <dd>a JavaScript object represented by a node data.</dd> </dl> <dl class="detailList"> <dt class="heading">Returns:</dt> <dt><span class="light fixedFont">{string}</span> </dt> </dl> </div> </td> </tr> <tr id="setDataProperty"> <td class="name"> <div class="name"> setDataProperty(data, propname, val) </div> <div class="attributes"> </div> </td> <td class="description"> <div class="description"> <p><p>This override changes the value of some property of a node data or an item data, given a string naming the property and the new value, in a manner that can be undone/redone and that automatically updates any bindings.<span class="nodetails" id="xmethsetDataProperty"><a class="morelink" onclick="hst('methsetDataProperty')">More...</a></span> <span class="details" id="methsetDataProperty"> </span><div class="details" id="dmethsetDataProperty"><p> This gets the old value of the property; if the value is the same as the new value, no side-effects occur.</div> </p><div class="seealso">See also: <ul class="seealsolist"> <li><a href="../symbols/Model.html#setDataProperty" class="linkMethod">Model.setDataProperty</a></li> </ul></div> <dl class="detailList"> <dt class="heading">Parameters:</dt> <dt> <span class="light fixedFont">{Object}</span> <b>data</b> </dt> <dd>a JavaScript object typically the value of a <a href="../symbols/Panel.html#data" class="linkProperty">Panel.data</a> and represented by a Node, Link, Group, simple Part, or item in a <a href="../symbols/Panel.html#itemArray" class="linkProperty">Panel.itemArray</a>; or this model's <a href="../symbols/Model.html#modelData" class="linkProperty">modelData</a>.</dd> <dt> <span class="light fixedFont">{string}</span> <b>propname</b> </dt> <dd>a string that is not null or the empty string.</dd> <dt> <span class="light fixedFont">{*}</span> <b>val</b> </dt> <dd>the new value for the property.</dd> </dl> </div> </td> </tr> <tr id="setParentKeyForNodeData"> <td class="name"> <div class="name"> setParentKeyForNodeData(nodedata, key) </div> <div class="attributes"> </div> </td> <td class="description"> <div class="description"> <p><p>Change the parent node for the given node data, given a key for the new parent, or undefined if there should be no parent.<span class="nodetails" id="xmethsetParentKeyForNodeData"><a class="morelink" onclick="hst('methsetParentKeyForNodeData')">More...</a></span> <span class="details" id="methsetParentKeyForNodeData"></span> </p><div class="seealso">See also: <ul class="seealsolist"> <li><a href="../symbols/TreeModel.html#nodeParentKeyProperty" class="linkProperty">nodeParentKeyProperty</a></li> <li><a href="../symbols/TreeModel.html#getParentKeyForNodeData" class="linkMethod">getParentKeyForNodeData</a></li> </ul></div> <dl class="detailList"> <dt class="heading">Parameters:</dt> <dt> <span class="light fixedFont">{Object}</span> <b>nodedata</b> </dt> <dd>a JavaScript object represented by a node.</dd> <dt> <span class="light fixedFont">{string|number|undefined}</span> <b>key</b> </dt> <dd>This may be undefined if there should be no parent node data.</dd> </dl> </div> </td> </tr> <tr id="setParentLinkCategoryForNodeData"> <td class="name"> <div class="name"> setParentLinkCategoryForNodeData(childdata, cat) </div> <div class="attributes"> </div> </td> <td class="description"> <div class="description"> <p><p>Change the category for the parent link of a given child node data, a string naming the link template that the <a href="../symbols/Diagram.ht