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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <title>GoJS® ChangedEvent 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 ChangedEvent </h2>  <p class="classsummary"> A ChangedEvent represents a change to an object, typically a <a href="../symbols/GraphObject.html" class="linkConstructor">GraphObject</a>, but also for model data, a <a href="../symbols/Model.html" class="linkConstructor">Model</a>, or a <a href="../symbols/Diagram.html" class="linkConstructor">Diagram</a>. The most common case is for remembering the name of a property and the before-and-after values for that property. <p> You can listen for changed events on the model using <a href="../symbols/Model.html#addChangedListener" class="linkMethod">Model.addChangedListener</a> or <a href="../symbols/Diagram.html#addModelChangedListener" class="linkMethod">Diagram.addModelChangedListener</a>, and on the Diagram using <a href="../symbols/Diagram.html#addChangedListener" class="linkMethod">Diagram.addChangedListener</a>. <p> There are four kinds of changes, represented by enumerated values: <a href="../symbols/ChangedEvent.html#Property" class="linkConstant">ChangedEvent.Property</a> (the most common), <a href="../symbols/ChangedEvent.html#Insert" class="linkConstant">ChangedEvent.Insert</a> and <a href="../symbols/ChangedEvent.html#Remove" class="linkConstant">ChangedEvent.Remove</a> (to represent inserting or removing objects from collections), and <a href="../symbols/ChangedEvent.html#Transaction" class="linkConstant">ChangedEvent.Transaction</a> (to notify about beginning or ending transactions or undo or redo). <p> The most common kind of ChangedEvent is a Property change. The name of the property is given by <a href="../symbols/ChangedEvent.html#propertyName" class="linkProperty">propertyName</a>. The modified object is given by <a href="../symbols/ChangedEvent.html#object" class="linkProperty">object</a>. Use the <a href="../symbols/ChangedEvent.html#oldValue" class="linkProperty">oldValue</a> and <a href="../symbols/ChangedEvent.html#newValue" class="linkProperty">newValue</a> properties for the before and after property values. <p> For an Insert ChangedEvent, the modified collection (often an Array) is a property value on the <a href="../symbols/ChangedEvent.html#object" class="linkProperty">object</a>. The <a href="../symbols/ChangedEvent.html#propertyName" class="linkProperty">propertyName</a> helps distinguish between different collections on the object. Use the <a href="../symbols/ChangedEvent.html#newValue" class="linkProperty">newValue</a> property to indicate the value that was inserted. Use the <a href="../symbols/ChangedEvent.html#newParam" class="linkProperty">newParam</a> property to indicate where or how, such as an array index or dictionary key. <p> For a Remove ChangedEvent, the modified collection is a property value on the <a href="../symbols/ChangedEvent.html#object" class="linkProperty">object</a>. The <a href="../symbols/ChangedEvent.html#propertyName" class="linkProperty">propertyName</a> helps distinguish between different collections on the object. Use the <a href="../symbols/ChangedEvent.html#oldValue" class="linkProperty">oldValue</a> property to indicate the value that was removed. Use the <a href="../symbols/ChangedEvent.html#oldParam" class="linkProperty">oldParam</a> property to indicate where or how, such as an array index or dictionary key. <p> Transaction ChangedEvents are generated by the <a href="../symbols/UndoManager.html" class="linkConstructor">UndoManager</a>. The <a href="../symbols/ChangedEvent.html#propertyName" class="linkProperty">propertyName</a> names the nature of the ChangedEvent. For the very first transaction, the property name is "StartingFirstTransaction". This ChangedEvent precedes a ChangedEvent whose property name is "StartedTransaction", which occurs for every top-level transaction. <p> When ending a transaction, there is first a ChangedEvent whose name is "ComittingTransaction". This is followed by one with either "CommittedTransaction" or "RolledBackTransaction", depending on how the transaction is ending. The <a href="../symbols/ChangedEvent.html#oldValue" class="linkProperty">oldValue</a> provides the transaction name and the <a href="../symbols/ChangedEvent.html#object" class="linkProperty">object</a> is the <a href="../symbols/Transaction.html" class="linkConstructor">Transaction</a> being finished. (Note that the Transaction value may be null if no Transaction is available at that time, perhaps because there were no changes made during the transaction.) That Transaction can be scanned to look for ChangedEvents that you may wish to record in a database, all within a single database transaction. <p> There are also Transaction ChangedEvents corresponding to "StartingUndo", "FinishedUndo", "StartingRedo", and "FinishedRedo". The <a href="../symbols/ChangedEvent.html#object" class="linkProperty">object</a> property provides the <a href="../symbols/Transaction.html" class="linkConstructor">Transaction</a> that is about-to-be or just-was undone or redone. <p> Non-Transaction ChangedEvents are remembered by the <a href="../symbols/UndoManager.html" class="linkConstructor">UndoManager</a>, if <a href="../symbols/UndoManager.html#isEnabled" class="linkProperty">UndoManager.isEnabled</a>, and held in the <a href="../symbols/UndoManager.html#history" class="linkProperty">UndoManager.history</a> as <a href="../symbols/Transaction.html" class="linkConstructor">Transaction</a>s which hold lists of ChangedEvents. That is why ChangedEvent implements <a href="../symbols/ChangedEvent.html#undo" class="linkMethod">undo</a> and <a href="../symbols/ChangedEvent.html#redo" class="linkMethod">redo</a> of the change that it remembers. <p> When the ChangedEvent represents a change to a <a href="../symbols/Model.html" class="linkConstructor">Model</a>, the value of <a href="../symbols/ChangedEvent.html#model" class="linkProperty">model</a> is non-null and the value of <a href="../symbols/ChangedEvent.html#diagram" class="linkProperty">diagram</a> is meaningless. If the change is a structural change to the model, the value of <a href="../symbols/ChangedEvent.html#modelChange" class="linkProperty">modelChange</a> indicates the kind of change. Currently defined model changed event names include: <ul> <li><b>"nodeDataArray"</b>, after the model's <a href="../symbols/Model.html#nodeDataArray" class="linkProperty">Model.nodeDataArray</a> is replaced, inserted into or removed from (setting <a href="../symbols/Model.html#nodeDataArray" class="linkProperty">Model.nodeDataArray</a> or calling <a href="../symbols/Model.html#addNodeData" class="linkMethod">Model.addNodeData</a> or <a href="../symbols/Model.html#removeNodeData" class="linkMethod">Model.removeNodeData</a>) </li> <li><b>"nodeKey"</b>, after changing a node data's unique key (<a href="../symbols/Model.html#setKeyForNodeData" class="linkMethod">Model.setKeyForNodeData</a>)</li> <li><b>"nodeCategory"</b>, after changing a node data's category (<a href="../symbols/Model.html#setCategoryForNodeData" class="linkMethod">Model.setCategoryForNodeData</a>)</li> <li><b>"linkFromKey"</b>, after changing a link data's "from" node key (<a href="../symbols/GraphLinksModel.html#setFromKeyForLinkData" class="linkMethod">GraphLinksModel.setFromKeyForLinkData</a>)</li> <li><b>"linkToKey"</b>, after changing a link data's "to" node key (<a href="../symbols/GraphLinksModel.html#setToKeyForLinkData" class="linkMethod">GraphLinksModel.setToKeyForLinkData</a>)</li> <li><b>"linkFromPortId"</b>, after changing a link data's "from" port (<a href="../symbols/GraphLinksModel.html#setFromPortIdForLinkData" class="linkMethod">GraphLinksModel.setFromPortIdForLinkData</a>)</li> <li><b>"linkToPortId"</b>, after changing a link data's "to" port (<a href="../symbols/GraphLinksModel.html#setToPortIdForLinkData" class="linkMethod">GraphLinksModel.setToPortIdForLinkData</a>)</li> <li><b>"linkLabelKeys"</b>, after replacing, inserting into, or removing from a link data's array of keys to label nodes (calling <a href="../symbols/GraphLinksModel.html#setLabelKeysForLinkData" class="linkMethod">GraphLinksModel.setLabelKeysForLinkData</a>, <a href="../symbols/GraphLinksModel.html#addLabelKeyForLinkData" class="linkMethod">GraphLinksModel.addLabelKeyForLinkData</a>, or <a href="../symbols/GraphLinksModel.html#removeLabelKeyForLinkData" class="linkMethod">GraphLinksModel.removeLabelKeyForLinkData</a>) </li> <li><b>"linkDataArray"</b>, after the model's <a href="../symbols/GraphLinksModel.html#linkDataArray" class="linkProperty">GraphLinksModel.linkDataArray</a> is replaced, inserted into or removed from (setting <a href="../symbols/GraphLinksModel.html#linkDataArray" class="linkProperty">GraphLinksModel.linkDataArray</a> or calling <a href="../symbols/GraphLinksModel.html#addLinkData" class="linkMethod">GraphLinksModel.addLinkData</a> or <a href="../symbols/GraphLinksModel.html#removeLinkData" class="linkMethod">GraphLinksModel.removeLinkData</a>) </li> <li><b>"nodeGroupKey"</b>, after changing a node data's key for a containing group data (<a href="../symbols/GraphLinksModel.html#setGroupKeyForNodeData" class="linkMethod">GraphLinksModel.setGroupKeyForNodeData</a>)</li> <li><b>"linkCategory"</b>, after changing a link data's category (<a href="../symbols/GraphLinksModel.html#setCategoryForLinkData" class="linkMethod">GraphLinksModel.setCategoryForLinkData</a>)</li> <li><b>"nodeParentKey"</b>, after changing a node data's "parent" node key (<a href="../symbols/TreeModel.html#setParentKeyForNodeData" class="linkMethod">TreeModel.setParentKeyForNodeData</a>)</li> <li><b>"parentLinkCategory"</b>, after changing a node data's "parent" link's category(<a href="../symbols/TreeModel.html#setParentLinkCategoryForNodeData" class="linkMethod">TreeModel.setParentLinkCategoryForNodeData</a>)</li> <li><b>"SourceChanged"</b>, for internal implementation use only</li> </ul> The value of <a href="../symbols/ChangedEvent.html#propertyName" class="linkProperty">ChangedEvent.propertyName</a> indicates the actual name of the property that was modified. <a href="../symbols/ChangedEvent.html#modelChange" class="linkProperty">ChangedEvent.modelChange</a> is a non-empty string only when there is a known structural change to the model, not just the setting of some property on some object. <p> When the ChangedEvent represents a change to a <a href="../symbols/Diagram.html" class="linkConstructor">Diagram</a> or a <a href="../symbols/GraphObject.html" class="linkConstructor">GraphObject</a> within a diagram, the value of <a href="../symbols/ChangedEvent.html#diagram" class="linkProperty">diagram</a> is non-null and the values of <a href="../symbols/ChangedEvent.html#model" class="linkProperty">model</a> and <a href="../symbols/ChangedEvent.html#modelChange" class="linkProperty">modelChange</a> are meaningless. <p> Please note that ChangedEvents can be raised for many different causes. You may not be interested in changes to temporary objects -- in that case ignore the ChangedEvent when <a href="../symbols/Model.html#skipsUndoManager" class="linkProperty">Model.skipsUndoManager</a> or <a href="../symbols/Diagram.html#skipsUndoManager" class="linkProperty">Diagram.skipsUndoManager</a> is true. </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 ChangedEvent."> <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"> ChangedEvent() </div> </td> <td class="description"> <div class="description"> <p><p>The ChangedEvent class constructor produces an empty ChangedEvent object. </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 ChangedEvent."> <thead> <tr> <th scope="col" class="name">Name, Value Type</th> <th scope="col" class="description">Description</th> </tr> </thead> <tbody> <tr id="change" > <td class="name"> <div class="name"> change </div> <div class="attributes"> <span class="light">{EnumValue}</span> </div> </td> <td class="description"> <div class="description">  <p>Gets or sets the nature of change that occurred.<span class="nodetails" id="xpropchange"><a class="morelink" onclick="hst('propchange')">More...</a></span> <span class="details" id="propchange"> The default is <a href="../symbols/ChangedEvent.html#Property" class="linkConstant">ChangedEvent.Property</a>. Other values are <a href="../symbols/ChangedEvent.html#Insert" class="linkConstant">ChangedEvent.Insert</a>, <a href="../symbols/ChangedEvent.html#Remove" class="linkConstant">ChangedEvent.Remove</a>, and <a href="../symbols/ChangedEvent.html#Transaction" class="linkConstant">ChangedEvent.Transaction</a>.</span> </div> </td> </tr> <tr id="diagram" > <td class="name"> <div class="name"> diagram </div> <div class="attributes"> <span class="light">{<a href="../symbols/Diagram.html" class="linkConstructor">Diagram</a>}</span> </div> </td> <td class="description"> <div class="description">  <p>Gets or sets the <a href="../symbols/Diagram.html" class="linkConstructor">Diagram</a> that was modified.<span class="nodetails" id="xpropdiagram"><a class="morelink" onclick="hst('propdiagram')">More...</a></span> <span class="details" id="propdiagram"> When this property is non-null, the <a href="../symbols/ChangedEvent.html#model" class="linkProperty">model</a> property will be null. However this property and the <a href="../symbols/ChangedEvent.html#model" class="linkProperty">model</a> property may both be null simultaneously, when no particular model or diagram applies.</span> </div> </td> </tr> <tr id="isTransactionFinished" > <td class="name"> <div class="name"> isTransactionFinished </div> <div class="attributes"> <span class="light">{boolean}</span> </div> </td> <td class="description"> <div class="description">  <p>This read-only property is true when this ChangedEvent is of type <a href="../symbols/ChangedEvent.html#Transaction" class="linkConstant">ChangedEvent.Transaction</a> and represents the end of a transactional change.<span class="nodetails" id="xpropisTransactionFinished"><a class="morelink" onclick="hst('propisTransactionFinished')">More...</a></span> <span class="details" id="propisTransactionFinished"> It is implemented as: <pre> return (this.change === ChangedEvent.Transaction && (this.propertyName === "CommittedTransaction" || this.propertyName === "FinishedUndo" || this.propertyName === "FinishedRedo")); </pre></span> </div> </td> </tr> <tr id="model" > <td class="name"> <div class="name"> model </div> <div class="attributes"> <span class="light">{<a href="../symbols/Model.html" class="linkConstructor">Model</a>}</span> </div> </td> <td class="description"> <div class="description">  <p>Gets or sets the <a href="../symbols/Model.html" class="linkConstructor">Model</a> or <a href="../symbols/TreeModel.html" class="linkConstructor">TreeModel</a> or <a href="../symbols/GraphLinksModel.html" class="linkConstructor">GraphLinksModel</a> that was modified.<span class="nodetails" id="xpropmodel"><a class="morelink" onclick="hst('propmodel')">More...</a></span> <span class="details" id="propmodel"> When this property is non-null, the <a href="../symbols/ChangedEvent.html#diagram" class="linkProperty">diagram</a> property will be null. However this property and the <a href="../symbols/ChangedEvent.html#diagram" class="linkProperty">diagram</a> property may both be null simultaneously, when no particular model or diagram applies.</span> </div> </td> </tr> <tr id="modelChange" > <td class="name"> <div class="name"> modelChange </div> <div class="attributes"> <span class="light">{string}</span> </div> </td> <td class="description"> <div class="description">  <p>Gets the name of the model change, reflecting a change to model data in addition to a change to the model itself.<span class="nodetails" id="xpropmodelChange"><a class="morelink" onclick="hst('propmodelChange')">More...</a></span> <span class="details" id="propmodelChange"> </span><div class="details" id="dpropmodelChange"><p> The default is an empty string, which indicates that this is just a regular change to some object's state, probably its property. For a list of possible model change names, see the documentation for <a href="../symbols/ChangedEvent.html" class="linkConstructor">ChangedEvent</a>.</div> </div> </td> </tr> <tr id="newParam" > <td class="name"> <div class="name"> newParam </div> <div class="attributes"> <span class="light">{*}</span> </div> </td> <td class="description"> <div class="description">  <p>Gets or sets an optional value associated with the new value.<span class="nodetails" id="xpropnewParam"><a class="morelink" onclick="hst('propnewParam')">More...</a></span> <span class="details" id="propnewParam"> Most properties do not require any parameter to describe the change. This is typically a value that helps distinguish the new value, such as an index into an array. It is null if it is not used. The default is null.</span> </div> </td> </tr> <tr id="newValue" > <td class="name"> <div class="name"> newValue </div> <div class="attributes"> <span class="light">{*}</span> </div> </td> <td class="description"> <div class="description">  <p>Gets or sets the next or current value that the property has.<span class="nodetails" id="xpropnewValue"><a class="morelink" onclick="hst('propnewValue')">More...</a></span> <span class="details" id="propnewValue"> The default is null.</span> </div> </td> </tr> <tr id="object" > <td class="name"> <div class="name"> object </div> <div class="attributes"> <span class="light">{Object}</span> </div> </td> <td class="description"> <div class="description">  <p>Gets or sets the Object that was modified.<span class="nodetails" id="xpropobject"><a class="morelink" onclick="hst('propobject')">More...</a></span> <span class="details" id="propobject"> The default is null. </span><div class="details" id="dpropobject"><p> For <a href="../symbols/ChangedEvent.html#Transaction" class="linkConstant">ChangedEvent.Transaction</a> changes, this may be the <a href="../symbols/Transaction.html" class="linkConstructor">Transaction</a>.</div> </div> </td> </tr> <tr id="oldParam" > <td class="name"> <div class="name"> oldParam </div> <div class="attributes"> <span class="light">{*}</span> </div> </td> <td class="description"> <div class="description">  <p>Gets or sets an optional value associated with the old value.<span class="nodetails" id="xpropoldParam"><a class="morelink" onclick="hst('propoldParam')">More...</a></span> <span class="details" id="propoldParam"> Most properties do not require any parameter to describe the change. This is typically a value that helps distinguish the old value, such as an index into an array. It is null if it is not used. The default is null.</span> </div> </td> </tr> <tr id="oldValue" > <td class="name"> <div class="name"> oldValue </div> <div class="attributes"> <span class="light">{*}</span> </div> </td> <td class="description"> <div class="description">  <p>Gets or sets the previous or old value that the property had.<span class="nodetails" id="xpropoldValue"><a class="morelink" onclick="hst('propoldValue')">More...</a></span> <span class="details" id="propoldValue"> The default is null.</span> </div> </td> </tr> <tr id="propertyName" > <td class="name"> <div class="name"> propertyName </div> <div class="attributes"> <span class="light">{string|function(Object):*}</span> </div> </td> <td class="description"> <div class="description">  <p>Gets or sets the name of the property change.<span class="nodetails" id="xproppropertyName"><a class="morelink" onclick="hst('proppropertyName')">More...</a></span> <span class="details" id="proppropertyName"> The default is an empty string, which is not a valid property name. This property can be useful even when the type of change is not <a href="../symbols/ChangedEvent.html#Property" class="linkConstant">ChangedEvent.Property</a>, because it can help identify the collection in the <a href="../symbols/ChangedEvent.html#object" class="linkProperty">object</a> that was modified (for <a href="../symbols/ChangedEvent.html#Insert" class="linkConstant">ChangedEvent.Insert</a> or <a href="../symbols/ChangedEvent.html#Remove" class="linkConstant">ChangedEvent.Remove</a>) or the stage of the current transaction (for <a href="../symbols/ChangedEvent.html#Transaction" class="linkConstant">ChangedEvent.Transaction</a>).</span> </div> </td> </tr> </tbody> </table> </div>  <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 ChangedEvent."> <thead> <tr> <th scope="col" class="name">Name, Return Type</th> <th scope="col" class="description">Description</th> </tr> </thead> <tbody> <tr id="canRedo"> <td class="name"> <div class="name"> canRedo() </div>