topic Re: FeatureLayer events�?� Which one fires when load / drawing complete? in ArcGIS JavaScript Maps SDK Questions

FeatureLayer events??? Which one fires when load / drawing complete?

DerrickMartin — Wed, 30 Oct 2013 16:15:30 GMT

I'm adding a FeatureLayer to a map and setting the definitionExpression for the layer. What I want is to zoom to the features that are loaded. I can't seem to find the event that is fired when the loading / drawing of the layer is complete. I've tried both the load and the update-end events, but it seems both of them are getting fired before the features are actually on the map. Any ideas?

Re: FeatureLayer events�?� Which one fires when load / drawing complete?

KenBuja — Wed, 30 Oct 2013 16:30:21 GMT

Have you tried using the map's update-end event?

Re: FeatureLayer events�?� Which one fires when load / drawing complete?

DerrickMartin — Wed, 30 Oct 2013 19:40:44 GMT

I tried that, but since I do a map.setExtent based on the extent of the features, it gets stuck in a loop, where the update-end fires, I do the zoom, which then triggers another map update�?�

Maybe I should re-word my question as�?� How to zoom to the extent of a feature layer after applying a definition expression?

Re: FeatureLayer events�?� Which one fires when load / drawing complete?

JasonZou — Thu, 31 Oct 2013 02:57:46 GMT

To prevent the recursive loop, use a flag variable, like below.

```
var bolDefExpSet = false;
```

set bolDefExpSet to true right after featureLayer.setDefinitionExpression.

```
map.on("update-end", function() {
```

Re: FeatureLayer events�?� Which one fires when load / drawing complete?

DerrickMartin — Thu, 31 Oct 2013 16:43:42 GMT

Thank you! Using the Ken's idea for update-end and zj's idea to stop the looping this is now working.
Too bad I can't give both of you the correct answer 😞

Re: FeatureLayer events�?� Which one fires when load / drawing complete?

Anonymous User — Sat, 11 Dec 2021 13:33:12 GMT

If you only want the function to run once you can use the dojo on.once() method. Using what zj wrote:

map.on.once("update-end", function() {
    // set map extent to the feature layer feature extent
    map.setExtent(...);   
    }
});