Latest Contributions by ChrisSands

I am using Arcade to customize the popup in a WAB Web Map. I am using parcel data in Florida and I have two fields in the data that use the same set of numeric county codes (CO_NO and CONO_PRV_H). I have a function to lookup the numeric value and return the county name. In {expression/expr12} I have function lookupCountyCode(countyCode){... return countyName}. I would like to be able to call that function from another expression or from the popup configuration, but I have not found any examples of how to do that. The obvious syntax would be {expression/expr12}.lookupCountyCode($feature["CO_NO"]) and then where I need the other value {expression/expr12}.lookupCountyCode($feature["CONO_PRV_H"]) but that doesn't do what I want. I see "County Code Lookup" (the name I gave my expression) in the Existing functions in the Arcade interface. If I click it, it adds a copy of my code to the current expression. I don't want another copy of the code to maintain. I want a way to call the function from outside the expression and I want to pass in the field as a value. I can't figure out what the syntax is. I even added a script tag to the HTML view of the popup Configuration with the lookupCountyCode function in it. <script type="text/arcade">function lookupCountyCode(countyCode){...return countyName}</script> But when I saved the map, the script tag and function vanished. How can I call this function from outside the expression and pass it a data field as a parameter? Or is this a limitation of Arcade? Then, once I have resolved this for the first county parcel layer, how can I apply it to all 67 county parcel layers without having to re-create all of my expressions repeatedly? ... View more

I have a web map with multiple layers served from my local rest map services. I want to build a web app that will allow me to specify in the url which of those layers are on or off.  I understand the default visibility is set in the web map. But the visibility can be changed in the web app with the LayerList widget. I want to change the visibility at load time without the user having to open the LayerList. I know there is an entry point to affecting the layer visibility through code because LayerList does it. I want to pass in my url http://<path>/?layers=1,2,3 so that all layers are turned off except those that match to indexes 1, 2, and 3 in my array of layers. I can take care of a lookup to get the names of these layers. Once I have a reference to the operating layers, I can set the visibility property to true or false for the specified layers. When I step through my code, I can see that the visibility values are changed, but there is no corresponding impact on the map. I think what I am missing are 1) referencing the operating layers correctly (this.operLayerInfos in LayerList/Widget.js); and 2) calling my function from a proper location where it will be invoked when the map loads. Or maybe visibility isn't the right property? I would appreciate any guidance for how/where to add this functionality. First draft code in attachment. ... View more