Enabling labelling within a web map causes validation errors when utilising the arcgis.map submodule in ArcGIS API for Python 2.4.x.

Solution de contournement

Including a simple renderer at the Web Map level resolves the validation error. This has to be done via adding the renderer to the Web Map JSON. Please note this can corrupt the item if incorrectly applied.

"layerDefinition": {

        "drawingInfo": {

          "labelingInfo": [

            {

              "labelExpression": "[OBJECTID]",

              "labelExpressionInfo": {

                "expression": "$feature[\"OBJECTID\"]"

              },

              "labelPlacement": "esriServerPointLabelPlacementAboveCenter",

              "repeatLabel": true,

              "symbol": {

                "type": "esriTS",

                "color": [

                  247,

                  247,

                  247,

                  255

                ],

                "font": {

                  "family": "Arial",

                  "size": 9.75

                },

                "horizontalAlignment": "center",

                "kerning": true,

                "haloColor": [

                  38,

                  38,

                  38,

                  255

                ],

                "haloSize": 1,

                "rotated": false,

                "text": "",

                "verticalAlignment": "baseline",

                "xoffset": 0,

                "yoffset": 0,

                "angle": 0

              }

            }

          ],

          "renderer": {

            "type": "simple",

            "symbol": {

              "type": "esriSMS",

              "style": "esriSMSCircle",

              "color": [

                0,

                0,

                255,

                255

              ],

              "size": 50

            }

          }

        }

      },

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