topic Re: Cannot read property 'on' of null at Object.set (ExportWMSImageParameters.js:5) in ArcGIS JavaScript Maps SDK Questions

Cannot read property 'on' of null at Object.set (ExportWMSImageParameters.js:5)

selcukcelik — Fri, 04 Aug 2017 13:26:18 GMT

Hi,

possilel bug issues about WMSLayer (api:4.4)

I am getting error while trying to use WMSLayer.

ERROR: Cannot read property 'on' of null at Object.set (ExportWMSImageParameters.js:5)

sample code from Sandbox: layers-wms

esriConfig.request.corsEnabledServers.push(
"mesonet.agron.iastate.edu");

layer = new WMSLayer({
// See http://mesonet.agron.iastate.edu/ogc/ for more WMS services from Iowa Environmental Mesonet (Iowa State University)
url: "https://mesonet.agron.iastate.edu/cgi-bin/wms/goes/conus_ir.cgi"
});

map = new Map({
//basemap: "dark-gray",
layers: [layer]
});
view = new MapView({
container: "viewDiv",
//center: [-123, 49],
//zoom: 5,
map: map
});

My code is smilar but it is typescript:

1- I am using for CORS:

esriConfig.request.corsEnabledServers.push(
"mesonet.agron.iastate.edu");

or:

urlUtils.addProxyRule({
urlPrefix: "https://mesonet.agron.iastate.edu",
proxyUrl: "/proxy"

});

and rest of the code:
var wmsLayer: any = new WMSLayer();
wmsLayer.url = "https://mesonet.agron.iastate.edu/cgi-bin/wms/goes/conus_ir.cgi"

this.mapManagerService.map.add(wmsLayer);

by the way I cant reach WMSLayer "url" property so I define it "any" type (Arcgis js Api: 4.4)

Thanks.

Re: Cannot read property 'on' of null at Object.set (ExportWMSImageParameters.js:5)

KellyHutchins — Sun, 12 Dec 2021 08:20:57 GMT

Looks like a bug in the typings that will be fixed at the next release. To workaround the issue for now you can update the index.d.ts file to add url to the WMSLayerProperties.

  interface WMSLayerProperties extends LayerProperties, PortalLayerProperties {
    copyright?: string;
    customLayerParameters?: any;
    customParameters?: any;
    description?: string;
    featureInfoFormat?: string;
    featureInfoUrl?: string;
    fullExtents?: ExtentProperties[];
    imageFormat?: string;
    imageMaxHeight?: number;
    imageMaxWidth?: number;
    imageTransparency?: boolean;
    spatialReference?: SpatialReferenceProperties;
    spatialReferences?: number[];
    sublayers?: Collection | any[];
    version?: string;
    url?: string;
  }
‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

I added a TypeScript WMSLayer sample here that updates the WMSLayerProperties interface in app/updates.d.ts.

TSSamples_JSAPI/WMSLayer at master · kellyhutchins/TSSamples_JSAPI · GitHub

Re: Cannot read property 'on' of null at Object.set (ExportWMSImageParameters.js:5)

baskentedas — Fri, 06 Oct 2017 12:35:14 GMT

still a bug in 4.5?

thanks.

Re: Cannot read property 'on' of null at Object.set (ExportWMSImageParameters.js:5)

KellyHutchins — Fri, 06 Oct 2017 16:28:40 GMT

The issue is resolved in 4.5. I just tested with the sample and it works just fine without the uopdates.d.ts file included.