ArcGIS Maps SDK for JavaScript 4.28, one question about LayerList.

韋竹陳 — Wed, 21 Feb 2024 08:02:35 GMT

Have others encountered the same issue? I'm developing a map using ArcGIS Maps SDK for JavaScript 4.28, and I've noticed that when I add a LayerList, there's a noticeable delay when moving the map. However, if I remove the LayerList, the issue disappears. I later found out that this is because the LayerList listens for layer loading events, causing the delay when moving the map with the mouse. How can I disable this event?

Re: ArcGIS Maps SDK for JavaScript 4.28, one question about LayerList.

AddisonShaw — Thu, 22 Feb 2024 17:10:06 GMT

How are you initializing the widget? It could be a problem with the React rendering lifecycle.

Re: ArcGIS Maps SDK for JavaScript 4.28, one question about LayerList.

韋竹陳 — Thu, 29 Feb 2024 05:19:26 GMT

Thanks for reply,here is my sample code:
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial -scale =1">
<title>有圖層清單的MapImageLayer</title>

// 配置ArcGIS
esriConfig.apiKey = "";

// 建立地圖
var map = new Map({
basemap: "hybrid"
});

// 建立一個視圖
var view = new MapView({
container: "viewDiv",
map: map
});

// 建立一個MapImageLayer
var layer = new MapImageLayer({
url: " https://server/rest/services/SampleWorldCities/MapServer "
});

// 將圖層加入地圖
view.map.layers.add(layer);

var layer2 = new MapImageLayer({
url: "https:///server/rest/services/SampleWorldCities/MapServer"
});

// 將圖層加入地圖
view.map.layers.add(layer2);

var layer3 = new MapImageLayer({
url: "https:///server/rest/services/SampleWorldCities/MapServer"
});

// 將圖層加入地圖
view.map.layers.add(layer3);
});

view.when(function(){
// 建立 Layerlist
var layerlist = new LayerList({
view: 觀點
});

// 將 Layerlist 加入地圖
view.ui.add(layerlist, "bottom-right");
});

</script>
</body>

We are displaying using map services, there are approximately 30 layers, each map service has multiple group layers but not much data inside, probably a few hundred records. However, when using LayerList, there is a delay when moving the map. I later found out that this is because the LayerList listens for layer loading events, causing the delay when moving the map with the mouse. How can I disable this event?

topic Re: ArcGIS Maps SDK for JavaScript 4.28, one question about LayerList. in ArcGIS JavaScript Maps SDK Questions

ArcGIS Maps SDK for JavaScript 4.28, one question about LayerList.

Re: ArcGIS Maps SDK for JavaScript 4.28, one question about LayerList.

Re: ArcGIS Maps SDK for JavaScript 4.28, one question about LayerList.