Error message occurs when trying to undo the Union operation in ArcGIS 10.2, resulting in an undefined or null reference error

I am currently working on incorporating a polygon union functionality using ArcGIS 10.2 JavaScript 3.6 API with undo and redo capabilities. The union operation works fine, but I encounter an error when attempting to undo the operation:

An unhandled exception occurred at line 19, column 1879 in

Error message: 0x800a138f - JavaScript runtime error: Unable to get property 'length' of undefined or null reference

Here is the relevant code snippet:

dojo.connect(dijit.byId("Merge_Button"), "onClick", function () {
    editing_function = "Merge_From";
    document.getElementById("Status_Message").innerHTML = "Select Polygon to Merge From"
    esri.bundle.toolbars.draw.addPoint = "Select Polygon to Merge From";
    drawToolbar.activate(esri.toolbars.Draw.POINT);
});

// The rest of the code snippets follow...

Feel free to reference the above code snippet for context.

javascriptunionpolygonarcgis

Answer №1

Just to share, I recently had to make a modification in the code snippet below:

                    var operation = new esri.dijit.editing.Union({
                        deletedGraphics: [merge_from_feature],
                        featureLayer: edit_featurelayer,
                        postUpdatedGraphics: new esri.Graphic(original_feature),
                        preUpdatedGraphics: [merge_to_feature]
                    });

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