topic Re: MapView.scale - Accessor set and get - async? in ArcGIS JavaScript Maps SDK Questions

MapView.scale - Accessor set and get - async?

AndreasKunz — Fri, 08 Nov 2019 17:47:07 GMT

Dear all,

recently i came across a strange behaviour of the Esri-JavaScript Api 4.13.
The MapView.scale was set in one method, and then the getter was called in another method. But the value returned was still the old one. I stepped inside the sources to the point where the set and get methods are implemented (Accessor, then MapView) and realised that there is a flag "internallyReady", which, in case of the getter, is used to decide which value to return, the old one or the new one.

I locked up the Api-Docs, but there was not any note about the scale property being asynchronous. To me it seems kind of odd, that a getter/setter is showing this kind behaviour. When is it save to call the getter to receive the value that was actually set?

Am i missing something?

Best regards
Andreas

Re: MapView.scale - Accessor set and get - async?

UndralBatsukh — Mon, 11 Nov 2019 19:07:35 GMT

Hi there,

You should watch for view.updating property to get the updated scale value. Please look at the Watch for Property changes section in this document.

Hope this helps,

-Undral

Re: MapView.scale - Accessor set and get - async?

AndreasKunz — Mon, 03 Feb 2020 16:13:20 GMT

Hi Undral,

sorry for answering so late, thanks for the tip! We managed to get around this, but i will keep the updating-property in mind.

Cheers
Schotty