topic Check to see if Layer is visible at current map extent in Web AppBuilder Custom Widgets Questions

Check to see if Layer is visible at current map extent

AdamCrateau1 — Fri, 20 May 2016 22:20:29 GMT

Is there a way to verify if a layer in the map is visible at the current map extent? FeatureLayer has a .maxScale property which can be used for this. I don't see anything similar for the LayerInfo class. Thanks for any suggestions.

Re: Check to see if Layer is visible at current map extent

RobertScheitlin__GISP — Fri, 20 May 2016 22:50:42 GMT

Adam,

LayerInfo has a maxScale and minScale. The WAB LayerInfos object you can get by using

LayerInfos.getInstance(this.map, this.map.itemInfo).then(lang.hitch(this, function(operLayerInfos) {

code as referenced in the LayerInfos class—Web AppBuilder for ArcGIS (Developer Edition) | ArcGIS for Developers

will allow you to get

array.forEach(operLayerInfos.getLayerInfoArray(), function(layerInfo) {

var isVisible = layerInfo.layerObject.visibleAtMapScale;

}

Re: Check to see if Layer is visible at current map extent

AdamCrateau1 — Fri, 20 May 2016 23:45:35 GMT

The layerObject property appears to expose all the underlying FeatureLayer properties -- exactly what I needed, Thank you!