topic Need help with polygon union operation using JavaScript 3.6 API with undo, redo in ArcGIS JavaScript Maps SDK Questions https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/need-help-with-polygon-union-operation-using/m-p/351873#M32609 <HTML><HEAD></HEAD><BODY><SPAN>I am trying to implement a polygon union operation using ArcGIS 10.2 JavaScript 3.6 API with undo, redo capabilities. I am able to perform the union operation, but when I try to undo the operation I get the following error:</SPAN><BR /><BR /><SPAN>Unhandled exception at line 19, column 1879 in </SPAN><A class="jive-link-external-small" href="http://js.arcgis.com/3.6/js/esri/dijit/editing/Cut.js" rel="nofollow" target="_blank">http://js.arcgis.com/3.6/js/esri/dijit/editing/Cut.js</A><BR /><BR /><SPAN>0x800a138f - JavaScript runtime error: Unable to get property 'length' of undefined or null reference</SPAN><BR /><BR /><SPAN>Code Snippet:</SPAN><BR /><BR /><PRE class="plain" name="code">dojo.connect(dijit.byId("Merge_Button"), "onClick", function () { &nbsp;&nbsp;&nbsp; editing_function = "Merge_From"; &nbsp;&nbsp;&nbsp; document.getElementById("Status_Message").innerHTML = "Select Polygon to Merge From" &nbsp;&nbsp;&nbsp; esri.bundle.toolbars.draw.addPoint = "Select Polygon to Merge From"; &nbsp;&nbsp;&nbsp; drawToolbar.activate(esri.toolbars.Draw.POINT); });&nbsp; dojo.connect(drawToolbar, "onDrawEnd", function (geometry) {&nbsp; if (editing_function == "Merge_From") { &nbsp;&nbsp;&nbsp; var point_selectQuery = new esri.tasks.Query(); &nbsp;&nbsp;&nbsp; point_selectQuery.geometry = geometry;&nbsp; &nbsp;&nbsp;&nbsp; edit_featurelayer.selectFeatures(point_selectQuery, esri.layers.FeatureLayer.SELECTION_NEW, function (features) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (features.length == 0) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; r = confirm("Nothing Selected. Try again?"); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (r == true) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; } &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; drawToolbar.deactivate(); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; document.getElementById("Status_Message").innerHTML = "Nothing exciting going on around here"; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; } &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; merge_from_features = features; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; editing_function = "Merge_To"; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; document.getElementById("Status_Message").innerHTML = "Select Polygon to Merge To"; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; esri.bundle.toolbars.draw.addPoint = "Select Polygon to Merge To"; &nbsp;&nbsp;&nbsp; }); &nbsp;&nbsp;&nbsp; return; }&nbsp; if (editing_function == "Merge_To") { &nbsp;&nbsp;&nbsp; var point_selectQuery = new esri.tasks.Query(); &nbsp;&nbsp;&nbsp; point_selectQuery.geometry = geometry; &nbsp;&nbsp;&nbsp; edit_featurelayer.selectFeatures(point_selectQuery, esri.layers.FeatureLayer.SELECTION_ADD, function (features) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (features.length == 0) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; r = confirm("Nothing Selected. Try again?"); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (r == true) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; } &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; drawToolbar.deactivate(); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; document.getElementById("Status_Message").innerHTML = "Nothing exciting going on around here"; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; } &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; merge_to_features = features; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; editing_function = ""; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; document.getElementById("Status_Message").innerHTML = "Nothing exciting going on around here"; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; drawToolbar.deactivate();&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; var input_geometries; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; try {&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; var from_g = merge_from_features[0].geometry; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; var to_g = merge_to_features[0].geometry; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; var input_geometries = [from_g, to_g];&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; geometryService.union(input_geometries, function (unioned_geometry) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; var merge_from_feature = merge_from_features[0]; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; var merge_to_feature = merge_to_features[0];&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; var original_feature = merge_to_feature.toJson(); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; merge_to_feature.geometry = unioned_geometry;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; edit_featurelayer.applyEdits(null, [merge_to_feature], [merge_from_feature], function () { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; try {&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; var operation = new esri.dijit.editing.Union({ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; deleted_graphics: [merge_from_feature], &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; featureLayer: edit_featurelayer, &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; preUpdatedGraphics: new esri.Graphic(original_feature), &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; postUpdatedGraphics: [merge_to_feature] &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; });&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; } &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; catch (err) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; alert(err.message); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; undoManager.add(operation); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; checkUI(); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; } &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; catch (err) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; alert(err.message); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }; &nbsp;&nbsp;&nbsp; });&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; return; };&nbsp; drawToolbar.deactivate();</PRE><DIV style="display:none;"> </DIV></BODY></HTML> Thu, 12 Sep 2013 10:34:41 GMT ThomasRoussell 2013-09-12T10:34:41Z Need help with polygon union operation using JavaScript 3.6 API with undo, redo https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/need-help-with-polygon-union-operation-using/m-p/351873#M32609 <HTML><HEAD></HEAD><BODY><SPAN>I am trying to implement a polygon union operation using ArcGIS 10.2 JavaScript 3.6 API with undo, redo capabilities. I am able to perform the union operation, but when I try to undo the operation I get the following error:</SPAN><BR /><BR /><SPAN>Unhandled exception at line 19, column 1879 in </SPAN><A class="jive-link-external-small" href="http://js.arcgis.com/3.6/js/esri/dijit/editing/Cut.js" rel="nofollow" target="_blank">http://js.arcgis.com/3.6/js/esri/dijit/editing/Cut.js</A><BR /><BR /><SPAN>0x800a138f - JavaScript runtime error: Unable to get property 'length' of undefined or null reference</SPAN><BR /><BR /><SPAN>Code Snippet:</SPAN><BR /><BR /><PRE class="plain" name="code">dojo.connect(dijit.byId("Merge_Button"), "onClick", function () { &nbsp;&nbsp;&nbsp; editing_function = "Merge_From"; &nbsp;&nbsp;&nbsp; document.getElementById("Status_Message").innerHTML = "Select Polygon to Merge From" &nbsp;&nbsp;&nbsp; esri.bundle.toolbars.draw.addPoint = "Select Polygon to Merge From"; &nbsp;&nbsp;&nbsp; drawToolbar.activate(esri.toolbars.Draw.POINT); });&nbsp; dojo.connect(drawToolbar, "onDrawEnd", function (geometry) {&nbsp; if (editing_function == "Merge_From") { &nbsp;&nbsp;&nbsp; var point_selectQuery = new esri.tasks.Query(); &nbsp;&nbsp;&nbsp; point_selectQuery.geometry = geometry;&nbsp; &nbsp;&nbsp;&nbsp; edit_featurelayer.selectFeatures(point_selectQuery, esri.layers.FeatureLayer.SELECTION_NEW, function (features) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (features.length == 0) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; r = confirm("Nothing Selected. Try again?"); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (r == true) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; } &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; drawToolbar.deactivate(); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; document.getElementById("Status_Message").innerHTML = "Nothing exciting going on around here"; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; } &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; merge_from_features = features; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; editing_function = "Merge_To"; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; document.getElementById("Status_Message").innerHTML = "Select Polygon to Merge To"; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; esri.bundle.toolbars.draw.addPoint = "Select Polygon to Merge To"; &nbsp;&nbsp;&nbsp; }); &nbsp;&nbsp;&nbsp; return; }&nbsp; if (editing_function == "Merge_To") { &nbsp;&nbsp;&nbsp; var point_selectQuery = new esri.tasks.Query(); &nbsp;&nbsp;&nbsp; point_selectQuery.geometry = geometry; &nbsp;&nbsp;&nbsp; edit_featurelayer.selectFeatures(point_selectQuery, esri.layers.FeatureLayer.SELECTION_ADD, function (features) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (features.length == 0) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; r = confirm("Nothing Selected. Try again?"); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if (r == true) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; } &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; drawToolbar.deactivate(); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; document.getElementById("Status_Message").innerHTML = "Nothing exciting going on around here"; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; return &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; } &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; merge_to_features = features; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; editing_function = ""; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; document.getElementById("Status_Message").innerHTML = "Nothing exciting going on around here"; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; drawToolbar.deactivate();&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; var input_geometries; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; try {&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; var from_g = merge_from_features[0].geometry; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; var to_g = merge_to_features[0].geometry; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; var input_geometries = [from_g, to_g];&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; geometryService.union(input_geometries, function (unioned_geometry) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; var merge_from_feature = merge_from_features[0]; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; var merge_to_feature = merge_to_features[0];&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; var original_feature = merge_to_feature.toJson(); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; merge_to_feature.geometry = unioned_geometry;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; edit_featurelayer.applyEdits(null, [merge_to_feature], [merge_from_feature], function () { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; try {&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; var operation = new esri.dijit.editing.Union({ &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; deleted_graphics: [merge_from_feature], &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; featureLayer: edit_featurelayer, &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; preUpdatedGraphics: new esri.Graphic(original_feature), &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; postUpdatedGraphics: [merge_to_feature] &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; });&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; } &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; catch (err) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; alert(err.message); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; undoManager.add(operation); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; checkUI(); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; } &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; catch (err) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; alert(err.message); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }; &nbsp;&nbsp;&nbsp; });&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; return; };&nbsp; drawToolbar.deactivate();</PRE><DIV style="display:none;"> </DIV></BODY></HTML> Thu, 12 Sep 2013 10:34:41 GMT https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/need-help-with-polygon-union-operation-using/m-p/351873#M32609 ThomasRoussell 2013-09-12T10:34:41Z Re: Need help with polygon union operation using JavaScript 3.6 API with undo, redo https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/need-help-with-polygon-union-operation-using/m-p/351874#M32610 <HTML><HEAD></HEAD><BODY><SPAN>Change:</SPAN><BR /><BR /><PRE class="plain" name="code">var operation = new esri.dijit.editing.Union({ &nbsp;&nbsp;&nbsp; deleted_graphics: [merge_from_feature], &nbsp;&nbsp;&nbsp; featureLayer: edit_featurelayer, &nbsp;&nbsp;&nbsp; preUpdatedGraphics: new esri.Graphic(original_feature), &nbsp;&nbsp;&nbsp; postUpdatedGraphics: [merge_to_feature] });</PRE><DIV style="display:none;"> </DIV><BR /><BR /><SPAN>To:</SPAN><BR /><BR /><PRE class="plain" name="code">var operation = new esri.dijit.editing.Union({ &nbsp;&nbsp;&nbsp; deletedGraphics: [merge_from_feature], &nbsp;&nbsp;&nbsp; featureLayer: edit_featurelayer, &nbsp;&nbsp;&nbsp; preUpdatedGraphics: [new esri.Graphic(original_feature)], &nbsp;&nbsp;&nbsp; postUpdatedGraphics: [merge_to_feature] });</PRE><DIV style="display:none;"> </DIV></BODY></HTML> Thu, 12 Sep 2013 12:59:25 GMT https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/need-help-with-polygon-union-operation-using/m-p/351874#M32610 JasonZou 2013-09-12T12:59:25Z Re: Need help with polygon union operation using JavaScript 3.6 API with undo, redo https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/need-help-with-polygon-union-operation-using/m-p/351875#M32611 <HTML><HEAD></HEAD><BODY><SPAN>Thank you Jason. That fixed the problem.</SPAN><BR /><BR /><SPAN>Tom</SPAN></BODY></HTML> Thu, 12 Sep 2013 15:06:10 GMT https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/need-help-with-polygon-union-operation-using/m-p/351875#M32611 ThomasRoussell 2013-09-12T15:06:10Z Re: Need help with polygon union operation using JavaScript 3.6 API with undo, redo https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/need-help-with-polygon-union-operation-using/m-p/351876#M32612 <HTML><HEAD></HEAD><BODY><SPAN>In case anyone is interersted, there was one more problem with the code. I needed to reverse the preUpdatedGraphics and the postUpdatedGraphics.</SPAN><BR /><BR /><BR /><PRE class="lia-code-sample line-numbers language-none">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; var operation = new esri.dijit.editing.Union({ &nbsp;&nbsp;&nbsp; deletedGraphics: [merge_from_feature], &nbsp;&nbsp;&nbsp; featureLayer: edit_featurelayer, &nbsp;&nbsp;&nbsp; postUpdatedGraphics: [new esri.Graphic(original_feature)], &nbsp;&nbsp;&nbsp; preUpdatedGraphics: [merge_to_feature] }); </PRE></BODY></HTML> Sat, 11 Dec 2021 16:31:44 GMT https://community.esri.com/t5/arcgis-javascript-maps-sdk-questions/need-help-with-polygon-union-operation-using/m-p/351876#M32612 ThomasRoussell 2021-12-11T16:31:44Z