topic Re: Editor: Cut Visible Sample with FeatureCollection in ArcGIS JavaScript Maps SDK Questions

Editor: Cut Visible Sample with FeatureCollection

DerivenC — Mon, 05 Aug 2013 19:12:40 GMT

There used to be an example where you could cut features with the edit tools. It has since been removed but still exists in the archives (and works):

http://developers.arcgis.com/en/javascript/samples/ed_editing_widget/index.html

And the option in the configuration still exists by setting cutVisible to true:

https://developers.arcgis.com/en/javascript/jsapi/editor.html

My question is: can I use this option against a FeatureLayer that is constructed by a feature collection?
https://developers.arcgis.com/en/javascript/jsapi/featurelayer.html#featurelayer2

I can perform a union but the cut doesn't seem to work. And without any documentation on the cut, I'm not sure if it ever worked for this type of scenario.

We are using ArcGIS for Server 10.0 and ArcGIS for JS 3.5.

Re: Editor: Cut Visible Sample with FeatureCollection

DerivenC — Mon, 12 Aug 2013 17:12:06 GMT

bump for response please

Re: Editor: Cut Visible Sample with FeatureCollection

DerivenC — Mon, 12 Aug 2013 19:03:38 GMT

Here's a better sample that doesn't work. I took the layer information from the Wildfire feature layer and plugged it into a feature collection-based feature layer. Doesn't work. Doesn't call the geometry service or do anything. So I can only assume that feature collection-based feature layers are simple not supported; because it must check during the cut, "is this a feature collection or not?"

*shrug*

Re: Editor: Cut Visible Sample with FeatureCollection

DerivenC — Mon, 12 Aug 2013 20:47:23 GMT

Figured it out by delving into the API. Had to modify the API to get it to work due to a bug in the editor code. Unfortunately now I have to use a hosted API solution until it gets fixed in core.

Now to figure out reshapeVisible .. or not. 🙂

Re: Editor: Cut Visible Sample with FeatureCollection

DerivenC — Sat, 11 Dec 2021 22:12:54 GMT

Here is the fix that I did from version 3.6 to 3.7. This is the fix for 3.7 specifically.

In the file /js/esri/dijit/editing/Editor-all.js for the "esri/dijit/editing/tools/Cut" class' _onDrawEnd...

change...

var p = new l;p.geometry = a;
k.forEach(b, function (a, b) {
 this._settings.editor._selectionHelper.selectFeatures(,
  p, f.SELECTION_NEW, m.hitch(this, "_cutFeatures", a, p))
}, this)

to...

var p = new l;p.geometry = a;
var __extentBasedQuery = new l;
__extentBasedQuery.geometry = esri.geometry.fromJson(p.geometry).getExtent();
k.forEach(b, function (a, b) {
 this._settings.editor._selectionHelper.selectFeatures(,
  __extentBasedQuery, f.SELECTION_NEW, m.hitch(this, "_cutFeatures", a, p))
}, this)

To be honest, it's been a while since I made this bug fix. So I cannot recall exactly why it works. But it had something to do with passing an extent rather than the geometry itself.

Re: Editor: Cut Visible Sample with FeatureCollection

derekswingley1 — Tue, 07 Jan 2014 23:52:02 GMT

Thanks for the additional info.

Running the editor sample on my machine with cutVisible: true does indeed work but there are two things that are probably contributing to you not seeing it work:

the services being used are slow, I've seen the cut operation take ten seconds or longer, unfortunately

pushing edits back to sampleserver3 requires a proxy

Once edits are pushed back to sampleserver3, the queries to show the new features can each take a few seconds so it takes additional time for the cut features to appear. When you say "And the cut does not persist", it sounds like edits aren't making their way back to the service on sampleserver3, which is expected if you aren't using a proxy when running locally.

Questions:

how long are you waiting for the cut operation to complete?

do you see a request to the cut endpoint on tasks.arcgisonline.com?

do you have a proxy set up when running this sample locally?

Regarding using the cut operation with a feature collection and why your fix works: when using a feature collection, we can only query by extents and not arbitrary lines/polygons. I'll take this use case back to the team and see what we want to do. At the very least, we should log something to the console saying the attempted query isn't supported when using a feature layer from a feature collection.

Re: Editor: Cut Visible Sample with FeatureCollection

DerivenC — Wed, 08 Jan 2014 01:41:41 GMT

Questions:

how long are you waiting for the cut operation to complete?

do you see a request to the cut endpoint on tasks.arcgisonline.com?

do you have a proxy set up when running this sample locally?

Regarding using the cut operation with a feature collection and why your fix works: when using a feature collection, we can only query by extents and not arbitrary lines/polygons. I'll take this use case back to the team and see what we want to do. At the very least, we should log something to the console saying the attempted query isn't supported when using a feature layer from a feature collection.

To your bullet point questions, I believe you are spot on. My use case doesn't utilize feature layers (and I'll explain that in a moment). So the samples were more like guides for me to assess the editor's stability more than anything else. When I noticed the lag, that told me that the cut tool didn't work. I cannot recall if I tried my "bug fix" with a feature layer. Maybe it works?

Ok .. so my mapping system does not use feature layers .. yet. The reason for this is its own chapter, I would rather not divulge. But the system is very sound and stable. If ever you want to see it, let me know and we can do a WebEx demo. Once you see it, you'll understand the complexity. This system really pushes ArcGIS. Lot of things customized and tweaked to reach the end goal.

But back to the feature layers. This is my usage scenario:

User selects a layer to edit

Frontend gets the tile layer's info and creates a feature collection from it

User edits this feature collection. (add, delete, edit, merge, cut, reshape)

When ready, the user commits the changes (or abandons them)

Frontend sends the changes to the backend service that updates the tile layer and recaches it

When done, the layer on the map is refreshed

Not everyone can see the beauty of this. But for what my system needs, it works wonders. This is why I always pull down the API and make my changes. It's worth the hassle. The cut tool works perfectly. (Please don't take it away from me. heh) Blame Kelly for opening my eyes to feature collections. They are amazingly useful!

Re: Editor: Cut Visible Sample with FeatureCollection

DerivenC — Wed, 08 Jan 2014 01:48:17 GMT

One more thought: proxy. My mapping system relies heavily on proxy. Security reasons. But I don't have the problem with lag and delays because I use a multi-subdomain solution which originally came from ESRI (looks like the blog post is dead). Something I always have to fight when ArcGIS for JS has some drastic change. I posted how to get it working here:

http://forums.arcgis.com/threads/87739-Option-to-Disable-CORS-or-Use-withCredentials?p=310920&viewfull=1#post310920

Multiple subdomaining is the best solution for ArcGIS/JS maps. Hands down.

Re: Editor: Cut Visible Sample with FeatureCollection

derekswingley1 — Wed, 08 Jan 2014 14:50:42 GMT

When I noticed the lag, that told me that the cut tool didn't work. I cannot recall if I tried my "bug fix" with a feature layer. Maybe it works?

I didn't explicitly state it, but your bug fix is not necessary when using a feature layer that uses a layer from a feature service.

I appreciate the background and additional info about your app and system, but I'm still interested in answers to the questions from my previous post.

I also discussed using a feature layer from a feature collection with the editor and we are going to add better error messaging to components of the editor. In its current state, the editor allows certain operations to fail silently (as you've found).

Blame Kelly for opening my eyes to feature collections. They are amazingly useful!

Agreed, feature layers from feature collections are a great thing but they are limiting when your app requires editing and/or advanced querying capabilities.

Re: Editor: Cut Visible Sample with FeatureCollection

KenBuja — Wed, 08 Jan 2014 15:14:22 GMT

Agreed, feature layers from feature collections are a great thing but they are limiting when your app requires editing and/or advanced querying capabilities.

Is there information in the documentation about what makes feature layers from feature collections so great?

Re: Editor: Cut Visible Sample with FeatureCollection

derekswingley1 — Wed, 08 Jan 2014 15:59:49 GMT

Is there information in the documentation about what makes feature layers from feature collections so great?

You get a feature layer w/o having to publish an arcgis server map or feature service. That may or may not appeal to you...the main sample in the SDK that does this takes data from a 3rd party (flickr) and creates a feature layer from it: https://developers.arcgis.com/en/javascript/jssamples/fl_featureCollection.html

Re: Editor: Cut Visible Sample with FeatureCollection

DerivenC — Wed, 08 Jan 2014 17:56:53 GMT

You get a feature layer w/o having to publish an arcgis server map or feature service. That may or may not appeal to you...the main sample in the SDK that does this takes data from a 3rd party (flickr) and creates a feature layer from it: https://developers.arcgis.com/en/javascript/jssamples/fl_featureCollection.html

@kenbuja Replace everywhere Derek mentions "feature layer" with "feature collection".

@swingley I'll do my best to answer your questions.

how long are you waiting for the cut operation to complete?

For the ESRI samples, right now it takes about 2-3 seconds for the cut process to complete. It takes about a second to start displaying any change.

do you see a request to the cut endpoint on tasks.arcgisonline.com?

I'm guessing this is in reference to my personal project. No. I use my own GeometryService from my own ArcGIS Server.

do you have a proxy set up when running this sample locally?

The sample, no. Proxy within my personal project for layers, yes. Even the GeometryService is proxied. Interestingly, all of my cut requests are instantaneous. No lag.

Re: Editor: Cut Visible Sample with FeatureCollection

derekswingley1 — Wed, 08 Jan 2014 18:53:53 GMT

how long are you waiting for the cut operation to complete?

For the ESRI samples, right now it takes about 2-3 seconds for the cut process to complete. It takes about a second to start displaying any change.

do you see a request to the cut endpoint on tasks.arcgisonline.com?

I'm guessing this is in reference to my personal project. No. I use my own GeometryService from my own ArcGIS Server.

do you have a proxy set up when running this sample locally?

The sample, no. Proxy within my personal project for layers, yes. Even the GeometryService is proxied. Interestingly, all of my cut requests are instantaneous. No lag.

Thanks. Since the sample in question doesn't include cut, you need to modify it and run it locally. When you do this, you have to have a proxy configured on the web server where you run the sample if you want to successfully use services on tasks.arcgisonline.com and sampleserver3.

I don't know where this leaves us...there are a number of moving parts here but I'll try to summarize:

the editor with cutVisible: true works as designed but requires a proxy on the web server where your app runs

the editor's cut tool is not supported with feature layers from feature collections and we'll do a better job of indicating this in the docs as well via a message logged to the browser's console when you try to do this

Re: Editor: Cut Visible Sample with FeatureCollection

DerivenC — Wed, 08 Jan 2014 19:12:27 GMT

Thanks. Since the sample in question doesn't include cut, you need to modify it and run it locally. When you do this, you have to have a proxy configured on the web server where you run the sample if you want to successfully use services on tasks.arcgisonline.com and sampleserver3.

I don't know where this leaves us...there are a number of moving parts here but I'll try to summarize:

the editor with cutVisible: true works as designed but requires a proxy on the web server where your app runs

the editor's cut tool is not supported with feature layers from feature collections and we'll do a better job of indicating this in the docs as well via a message logged to the browser's console when you try to do this

Actually there is a sample that does it. It's in the OP...
http://developers.arcgis.com/en/javascript/samples/ed_editing_widget/index.html

Also you don't need to alter the code and test locally. That's what the ArcGIS sandbox is for. I mention this in this thread and include the code to do so. (I always CYA as best I can before posting here. heh) It doesn't require a proxy. Unless the sandbox is altering the code given it.

Even though it is not supported, I hope I can continue altering the API to support it.

Re: Editor: Cut Visible Sample with FeatureCollection

DerivenC — Sat, 11 Dec 2021 22:12:51 GMT

I merged two samples (Editing: Editor widget with simple toolbar + Vector Feature Layers: Feature collection) and tried them locally as well as in the ArcGIS sandbox. Cut doesn't work. I check the developer tools and notice that no calls to the GeometryService are made. It's like it does nothing at all. Can someone please tell me why?

<!DOCTYPE html><html>  
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <!--The viewport meta tag is used to improve the presentation and behavior of the
    samples on iOS devices-->
    <meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no">
    <title>Cut Feature Collection</title>
  <link rel="stylesheet" href="http://js.arcgis.com/3.6/js/dojo/dijit/themes/claro/claro.css">
    <link rel="stylesheet" href="http://js.arcgis.com/3.6/js/esri/css/esri.css">
     <style>
      html,body{height:100%;width:100%;margin:0;overflow:hidden;}
      #map{
        padding:0;
      }
      #header{
        font-size: 1.1em;
        font-family: sans-serif;
        padding-left: 1em;
        padding-top:4px;
        color:#660000;
      }
      .templatePicker {
        border: none;
      }


      .dj_ie .infowindow .window .top .right .user .content { position: relative; }
      .dj_ie .simpleInfoWindow .content {position: relative;}
    </style>


    <script>var dojoConfig = { parseOnLoad: true };</script>
    <script src="http://js.arcgis.com/3.6/"></script>
    <script>
      var map;
      require([
        "esri/map",
        "esri/toolbars/edit",
        "esri/layers/ArcGISTiledMapServiceLayer",
        "esri/layers/FeatureLayer",
        "esri/symbols/SimpleMarkerSymbol",
        "esri/symbols/SimpleLineSymbol",
        "esri/dijit/editing/Editor",
        "esri/dijit/editing/TemplatePicker",
        "esri/dijit/PopupTemplate",
        "esri/request",
        "esri/geometry/Point",
        "esri/graphic",
        "esri/config",
        "dojo/i18n!esri/nls/jsapi",
        "dojo/_base/array", "dojo/parser", "dojo/keys",
        "dijit/layout/BorderContainer", "dijit/layout/ContentPane", 
        "dojo/on",
        "dojo/_base/array",
        "dojo/domReady!"
      ], function(
        Map, 
        Edit,
        ArcGISTiledMapServiceLayer,
        FeatureLayer, 
        SimpleMarkerSymbol,
        SimpleLineSymbol,
        Editor,
        TemplatePicker,
        PopupTemplate,
        esriRequest,
        Point,
        Graphic,
        esriConfig,
        jsapiBundle,
        arrayUtils,
        parser,
        keys,
        BorderContainer,
        ContentPane,
        on,
        array
      ) {


        var featureLayer;
        parser.parse();
        jsapiBundle.toolbars.draw.start = jsapiBundle.toolbars.draw.start +  "<br>Press <b>ALT</b> to enable snapping";
        esriConfig.defaults.geometryService = new esri.tasks.GeometryService("http://tasks.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer");
        map = new Map("map", {
          basemap: "satellite",
          center: [-46.807, 32.553],
          zoom: 3
        });
        
        var labels = new ArcGISTiledMapServiceLayer("http://server.arcgisonline.com/ArcGIS/rest/services/Reference/World_Boundaries_and_Places/MapServer");
        map.addLayer(labels);


        //create a feature collection
        var featureCollection = {
          "layerDefinition": null,
          "featureSet": {
            "features": [],
            "geometryType": "esriGeometryPolygon"
          }
        };
        featureCollection.layerDefinition = {
            "geometryType": "esriGeometryPolygon",
            "objectIdField": "ObjectID",
            "drawingInfo" : {
                "renderer" : {
                    "type" : "simple", 
                    "symbol" : {
                        "type" : "esriSFS", 
                        "style" : "esriSFSSolid", 
                        "color" : null, 
                        "outline" : {
                            "type" : "esriSLS", 
                            "style" : "esriSLSSolid", 
                            "color" : [
                                0, 
                                0, 
                                0, 
                                255
                            ], 
                            "width" : 1
                        }
                    }, 
                    "label" : "", 
                    "description" : ""
                },
            },
          "fields": [{
            "name": "ObjectID",
            "alias": "ObjectID",
            "type": "esriFieldTypeOID"
          }, {
            "name": "description",
            "alias": "Description",
            "type": "esriFieldTypeString"
          }, {
            "name": "title",
            "alias": "Title",
            "type": "esriFieldTypeString"
          }]
        };


        //define a popup template
        var popupTemplate = new PopupTemplate({
          title: "{title}",
          description: "{description}"
        });


        //create a feature layer based on the feature collection
        featureLayer = new FeatureLayer(featureCollection, {
          id: 'fcLayer',
          infoTemplate: popupTemplate
        });


        //associate the features with the popup on click
        featureLayer.on("click", function(evt) {
          map.infoWindow.setFeatures([evt.graphic]);
        });


        map.on("layers-add-result", initEditor);
        //add the feature layer
        map.addLayers([featureLayer]);
        
        function initEditor(evt) {
          var templateLayers = arrayUtils.map(evt.layers, function(result){
            return result.layer;
          });
          var templatePicker = new TemplatePicker({
            featureLayers: templateLayers,
            grouping: true,
            rows: "auto",
            columns: 3
          }, "templateDiv");
          templatePicker.startup();


          var layers = arrayUtils.map(evt.layers, function(result) {
            return { featureLayer: result.layer };
          });
          var settings = {
            map: map,
            templatePicker: templatePicker,
            layerInfos: layers,
            toolbarVisible: true,
            createOptions: {
              polylineDrawTools:[ Editor.CREATE_TOOL_FREEHAND_POLYLINE ],
              polygonDrawTools: [ Editor.CREATE_TOOL_FREEHAND_POLYGON,
                Editor.CREATE_TOOL_CIRCLE,
                Editor.CREATE_TOOL_TRIANGLE,
                Editor.CREATE_TOOL_RECTANGLE
              ]
            },
            toolbarOptions: {
              reshapeVisible: true,
              cutVisible: true,
              mergeVisible: true
            }
          };


          var params = {settings: settings};    
          var myEditor = new Editor(params,'editorDiv');
          //define snapping options
          var symbol = new SimpleMarkerSymbol(
            SimpleMarkerSymbol.STYLE_CROSS, 
            15, 
            new SimpleLineSymbol(
              SimpleLineSymbol.STYLE_SOLID, 
              new Color([255, 0, 0, 0.5]), 
              5
            ), 
            null
          );
          map.enableSnapping({
            snapPointSymbol: symbol,
            tolerance: 20,
            snapKey: keys.ALT
          });
    
          myEditor.startup();
        }
    });
    </script>
  </head>
    <body class="claro">
    <div id="main" data-dojo-type="dijit/layout/BorderContainer" data-dojo-props="design:'headline'" style="height:width:100%;height:100%;">
      <div data-dojo-type="dijit/layout/ContentPane" id="header" data-dojo-props="region:'top'">
        Cut Polygons
      </div>
      <div data-dojo-type="dijit/layout/ContentPane" data-dojo-props="region:'left'" style="width: 300px;overflow:hidden;">
        <div id="templateDiv"></div>
        <div id="editorDiv"></div>
      </div>
      <div data-dojo-type="dijit/layout/ContentPane" id="map" data-dojo-props="region:'center'"></div>
    </div>
  </body>


</html>

Re: Editor: Cut Visible Sample with FeatureCollection

DerivenC — Sat, 11 Dec 2021 22:12:57 GMT

Also by adding cutVisible:true to this example shows that it does not work correctly:

https://developers.arcgis.com/en/javascript/jssamples/ed_simpletoolbar.html

<!DOCTYPE html><html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <!--The viewport meta tag is used to improve the presentation and behavior of the samples 
      on iOS devices-->
    <meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no">
    <title>Edit rivers and waterbodies</title>


    <link rel="stylesheet" href="http://js.arcgis.com/3.8/js/dojo/dijit/themes/claro/claro.css">
    <link rel="stylesheet" href="http://js.arcgis.com/3.8/js/esri/css/esri.css" />
    <style>
      html,body{height:100%;width:100%;margin:0;overflow:hidden;}
      #map{
        padding:0;
      }
      #header{
        font-size: 1.1em;
        font-family: sans-serif;
        padding-left: 1em;
        padding-top:4px;
        color:#660000;
      }
      .templatePicker {
        border: none;
      }


      .dj_ie .infowindow .window .top .right .user .content { position: relative; }
      .dj_ie .simpleInfoWindow .content {position: relative;}
    </style>
    
    <script src="http://js.arcgis.com/3.8/"></script>
    <script>
      var map;
      
      require([
        "esri/map", 
        "esri/tasks/GeometryService",
        "esri/toolbars/edit",


        "esri/layers/ArcGISTiledMapServiceLayer",
        "esri/layers/FeatureLayer",


        "esri/symbols/SimpleMarkerSymbol",
        "esri/symbols/SimpleLineSymbol",


        "esri/dijit/editing/Editor",
        "esri/dijit/editing/TemplatePicker",


        "esri/config",
        "dojo/i18n!esri/nls/jsapi",


        "dojo/_base/array", "dojo/parser", "dojo/keys",


        "dijit/layout/BorderContainer", "dijit/layout/ContentPane", 
        "dojo/domReady!"
      ], function(
        Map, GeometryService, Edit, 
        ArcGISTiledMapServiceLayer, FeatureLayer,
        SimpleMarkerSymbol, SimpleLineSymbol, 
        Editor, TemplatePicker,
        esriConfig, jsapiBundle,
        arrayUtils, parser, keys
      ) {
        parser.parse();       


        // snapping is enabled for this sample - change the tooltip to reflect this
        jsapiBundle.toolbars.draw.start = jsapiBundle.toolbars.draw.start +  "<br>Press <b>ALT</b> to enable snapping";
       
        // refer to "Using the Proxy Page" for more information:  https://developers.arcgis.com/en/javascript/jshelp/ags_proxy.html
        esriConfig.defaults.io.proxyUrl = "/proxy";    


        //This service is for development and testing purposes only. We recommend that you create your own geometry service for use within your applications. 
        esriConfig.defaults.geometryService = new GeometryService("http://tasks.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer");
        
        map = new Map("map", { 
          basemap: "satellite",
          center: [-96.541, 38.351],
          zoom: 14,
          slider: false 
        });


        map.on("layers-add-result", initEditor);
       
        //add boundaries and place names 
        var labels = new ArcGISTiledMapServiceLayer("http://server.arcgisonline.com/ArcGIS/rest/services/Reference/World_Boundaries_and_Places/MapServer");
        map.addLayer(labels);


        var rivers = new FeatureLayer("http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/Hydrography/Watershed173811/FeatureServer/1",{
          mode: FeatureLayer.MODE_ONDEMAND, 
          outFields: ['*']
        });


        var waterbodies = new FeatureLayer("http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/Hydrography/Watershed173811/FeatureServer/0",{
          mode: FeatureLayer.MODE_ONDEMAND, 
          outFields: ['*']
        });


        map.addLayers([waterbodies,rivers]);


        function initEditor(evt) {
          var templateLayers = arrayUtils.map(evt.layers, function(result){
            return result.layer;
          });
          var templatePicker = new TemplatePicker({
            featureLayers: templateLayers,
            grouping: true,
            rows: "auto",
            columns: 3
          }, "templateDiv");
          templatePicker.startup();


          var layers = arrayUtils.map(evt.layers, function(result) {
            return { featureLayer: result.layer };
          });
          var settings = {
            map: map,
            templatePicker: templatePicker,
            layerInfos: layers,
            toolbarVisible: true,
            createOptions: {
              polylineDrawTools:[ Editor.CREATE_TOOL_FREEHAND_POLYLINE ],
              polygonDrawTools: [ Editor.CREATE_TOOL_FREEHAND_POLYGON,
                Editor.CREATE_TOOL_CIRCLE,
                Editor.CREATE_TOOL_TRIANGLE,
                Editor.CREATE_TOOL_RECTANGLE
              ]
            },
            toolbarOptions: {
              reshapeVisible: true,
              cutVisible: true
            }
          };


          var params = {settings: settings};    
          var myEditor = new Editor(params,'editorDiv');
          //define snapping options
          var symbol = new SimpleMarkerSymbol(
            SimpleMarkerSymbol.STYLE_CROSS, 
            15, 
            new SimpleLineSymbol(
              SimpleLineSymbol.STYLE_SOLID, 
              new Color([255, 0, 0, 0.5]), 
              5
            ), 
            null
          );
          map.enableSnapping({
            snapPointSymbol: symbol,
            tolerance: 20,
            snapKey: keys.ALT
          });
    
          myEditor.startup();
        }
      });
    </script>
  </head>
  <body class="claro">
    <div id="main" data-dojo-type="dijit/layout/BorderContainer" data-dojo-props="design:'headline'" style="height:width:100%;height:100%;">
      <div data-dojo-type="dijit/layout/ContentPane" id="header" data-dojo-props="region:'top'">
        Edit Hydrography
      </div>
      <div data-dojo-type="dijit/layout/ContentPane" data-dojo-props="region:'left'" style="width: 300px;overflow:hidden;">
        <div id="templateDiv"></div>
        <div id="editorDiv"></div>
      </div>
      <div data-dojo-type="dijit/layout/ContentPane" id="map" data-dojo-props="region:'center'"></div>
    </div>
  </body>
</html>

What you'll get is only a portion of the polygon, rather than two or more cut up pieces of the original polygon. And the cut does not persist.