Use Selection From Select Widget in Web AppBuilder

[GrantTaylor2]

Hi,

Is it possible, and if so how do I use a selection set I've made with the Select Widget with another custom developed widget?

[GrantTaylor2]

I have the answer I was looking for. That will teach me to read the documentation properly in future ...

var count = 0;

array.forEach(this.map.itemInfo.itemData.operationalLayers, function (layer) {

  var featureLayer = layer.layerObject;

  count += featureLayer.getSelectedFeatures().length;

}, this);

[fahadrasheed]

Hi there i'm also facing this issue can you please elaborate the solution? 
i'm looking to get OIDs of features selected through select widget.
any sort of help / pointers will be appreciated.  

[GrantTaylor2]

Hi Fahad,

Get the name of the Id field by calling the objectidField method on a featureLayer.

Then if you call the getSelectedFeatures on a featureLayer you will get an array of Graphic objects.

Use the objectidField name to get the Id of the feature (Graphic) from its attributes array.

var ids = [];
array.forEach(this.map.itemInfo.itemData.operationalLayers, function (layer) {
   var featureLayer = layer.layerObject;
      array.forEach(featureLayer.getSelectedFeatures(), function (feature) {
         ids.push(feature.attributes[featureLayer.objectIdField]);
      }, this);
}, this);

I think that is the gist of it. Apologies my javascript is a bit rusty.

These may help:

Select with Feature Layer | ArcGIS API for JavaScript 3.34 

Graphic | API Reference | ArcGIS API for JavaScript 3.34 

FeatureLayer | API Reference | ArcGIS API for JavaScript 3.34 

[fahadrasheed]

Hi Grant,

Thank you for your kind reply. I have a simple widget in which a button in defined and on clicking the button i'm trying to define a function which will store OIDs of selected feature in a variable which i then pass on to some non esri webapps to preform some task. 
I have tried to apply your code in the function i defined for my button but it throws back an error "Uncaught reference error: array is no defined", as i'm also new in javascript i have no idea what i'm doing wrong here. I'll attach the picture of code that i have and it'll a great help if can take a look and can point out what is wrong with this code that i'm trying out. 

[GrantTaylor2]

Hi Fahad,

You will need to add the array module to the define at the top of your code and also as a parameter to the function, see below.

define(['dojo/_base/declare',
        'jimu/BaseWidget',
        'dojo/_base/array',
        'esri/layers/FeatureLayer'
],
function(declare, BaseWidget, array) { ...‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

https://dojotoolkit.org/reference-guide/1.10/dojo/_base/array.html 

[fahadrasheed]

Hi Grant, 

Thanks again for your reply, I applied the changes as you guided in above comment but now it throw back a different sort of error "uncaught TypeError : array.forEach is not a function".
i read the dojo documentation about dojo/_base/array but i can not see what is wrong in this script. On removing array.forEach ids variable generate empty output.

 

[GrantTaylor2]

Hi Fahad,

Try putting the items in the function definition in the same order as they are in the declare array.

define(['dojo/_base/declare',
        'jimu/BaseWidget',
        'dojo/_base/array',
        'dojo/dom',
        'esri/map',
        'esri/layers/layer',
        'esri/graphic'
],
function(declare, BaseWidget, array) { ...

[fahadrasheed]

Hi Grant, 

Finally it worked Thanks a lot.

One more question, what if the featurelayer i'm using in my web app has multiple featureclasses i.e. some different sort of point features and some line features, how can i limit the return of OID to only the feature which i want not others which may also get selected due to they overlay on each other.

Thank you Again.

[GrantTaylor2]

Hello Fahad,

You could try something like this...

var featureLayer = layer.layerObject;
if(featureLayer.geometryType === 'polyline') {
    ...
}

FeatureLayer | ArcGIS API for JavaScript 4.17