I am having an issue with Perspective Map and I wanted to see if anyone else has experienced this:
If I have a Map and I manually create the structure:
The map loads fine.
If I bind features to anything and hit save, the map, in both the browser and designer, will show
with the error: can't access property "length", s.features is undefined. This is also shown in the js console.
If I reload the web page it works again. It seems to only break on designer save.
If I set the prop to Persistent, that also seems to fix it.
Binding lower level props or the whole array (layers.other.geoJSON[0]) also seems to work fine.
Any thoughts? I’ll try sending this to support soon if this isn’t a me thing
I should add that the reason I want to bind features specifically is that this is easy to get from Postgresql, and I want to have a styleOptions field. Its nice when this field is known to Designer, rather than being set from a script, so that its easier to use
Bindings that require a callout to a DB or across the network will supply a null until the data arrives. You should place the binding on a custom property, and use coalesce() to substitute a default value for features until the null is replaced.
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ahh, perfect! I thought there would be an easy way to do this. Thank you!
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Sorry for an additional late reply, I had an alternative but worse solution when I posted this, and I’ve just gotten around to trying this properly.
I can’t get coalesce to work, or a script checking for None. I have the binding on a separate custom property as suggested, then I’ve tried:
using using a property binding to get it onto layers.ui.other.geoJSON[2].features, with a transform
using an expression binding with coalesce directly
As a test, I tried both of these targeting a binding of a blank array.
The only way I can get a binding (at the features level) to work is by also setting the feature to be persistent
pturmel
January 12, 2026, 11:36pm
6
I can't read your mind nor see how you applied or misapplied the coalesce() function. Show us .
