topic Re: Remove Layer from ListView Programticaly in Web AppBuilder Custom Widgets Questions

Remove Layer from ListView Programticaly

OracleEsri — Tue, 18 Feb 2020 19:07:00 GMT

Hello everyone, I need to used API to return permissions on layers If the user haven't permission hide/ remove a layer from the map.

Re: Remove Layer from ListView Programticaly

LeoLiu1 — Tue, 18 Feb 2020 23:56:31 GMT

How about this?

Map | API Reference | ArcGIS API for JavaScript 3.31

Then in your widget, use

this.Map.removeLayer(YOURLAYEROBJECT);‍‍

Re: Remove Layer from ListView Programticaly

OracleEsri — Wed, 19 Feb 2020 03:43:44 GMT

Thanks for your replaying, but when calling API using (Esri/request) needs to be asynchronous.

Re: Remove Layer from ListView Programticaly

HushamMohamed — Wed, 19 Feb 2020 08:53:14 GMT

I really found Robert Scheitlin, GISP answer here Very helpful.

hope it help you as Well.

Re: Remove Layer from ListView Programticaly

OracleEsri — Wed, 19 Feb 2020 11:35:31 GMT

Thanks for your response, but when calling API using (Esri/request) in (ListLayer) needs to be asynchronous. where the layer appears before the response from the remote server received.

Re: Remove Layer from ListView Programticaly

LeoLiu1 — Wed, 19 Feb 2020 23:59:56 GMT

Ahh, OK. In that case, it's probably not a good idea to control the layers' permission within a custom widget as the widget is quite often created later than the map.

It's better setting up user permissions on the source layers of your web map.

So the response of the map request doesn't contain the in-accessible layers at all.

Cheers,

Leo.

Re: Remove Layer from ListView Programticaly

OracleEsri — Fri, 21 Feb 2020 14:47:38 GMT

Thanks, Leo, Can you give me a sample of codes as examples.

Re: Remove Layer from ListView Programticaly

Anonymous User — Sun, 12 Dec 2021 10:54:52 GMT

Hi Oracle Esri‌,

Here is the sample code for you.

I assume you create layer with something like var layer = new FeatureLayer(... kind of style.

Below is the sample code, you might see that console.warn layer access error statement. I can manage to catch user accessibly to that layer at that place.

_waitForLayer: function (layer) {
        var dfd = new Deferred(),
          handles = [];
        if (layer.loaded) {
          dfd.resolve(layer);
          return dfd;
        }
        if (layer.loadError) {
          dfd.reject(layer.loadError);
          return dfd;
        }
        var clearHandles = function () {
          array.forEach(handles, function (h) {
            h.remove();
          });
        };
        //console.warn("_waitForLayer");
        handles.push(layer.on("load", function (layerLoaded) {
          //console.warn("_waitForLayer.load",layerLoaded);
          clearHandles();
          dfd.resolve(layerLoaded.layer);
        }));
        handles.push(layer.on("error", function (layerError) {
          //console.warn("_waitForLayer.error",layerError);
          clearHandles();
          var error = layerError.error;
          try {
            if (error.message && (error.message.indexOf("Unable to complete") !== -1)) {
              console.warn("layerAccessError", error);
              dfd.reject(new Error(i18n.search.layerInaccessible));
            } else {
              dfd.reject(error);
            }
          } catch (ex) {
            //console.warn("layerAccessError",ex);
            dfd.reject(error);
          }
        }));
        return dfd;
      },


this._waitForLayer(layer).then(lang.hitch(this, function (layer) {
//layer result is in layer variable
// layer is loaded here
});‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍