topic Re: How to detect a map service status in ArcGIS JavaScript Maps SDK Questions

How to detect a map service status

RobertKirkwood — Tue, 05 Apr 2016 19:38:08 GMT

I have several outside services that i use in my map. Sometimes these services may be down and it affects the loading of my map. I would like to check on the status of the services and if they are down the application would not put them in the map and TOC. I am using the ESRI JavaScript API. Thanks!

Re: How to detect a map service status

RobertScheitlin__GISP — Sat, 11 Dec 2021 20:50:46 GMT

Robert,

You can use esriRequest to get the services json and if that fails then the map service is dwon and you do not attempt to load the layer.

require([
  "esri/request", ... 
], function(esriRequest, ... ) {
  var layerUrl = "http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Demographics/ESRI_Census_USA/MapServer/layers";
  var layersRequest = esriRequest({
    url: layerUrl,
    content: { f: "json" },
    handleAs: "json",
    callbackParamName: "callback"
  });
  layersRequest.then(
    function(response) {
      console.log("Success: ", response.layers);
  }, function(error) {
      console.log("Error: ", error.message);
  });
  ...
});

Re: How to detect a map service status

KenBuja — Tue, 05 Apr 2016 19:55:19 GMT

This post had another example of using XMLHttpRequest to test this map server response: https://community.esri.com/thread/173645#comment-594343

Re: How to detect a map service status

RobertKirkwood — Tue, 05 Apr 2016 20:09:23 GMT

Thanks. This gets me going in the right direction!

Re: How to detect a map service status

RobertKirkwood — Thu, 23 Jun 2016 13:54:19 GMT

I got this to work for me thanks. I also had to modify the TOC code as follows:

//Code for the layers in the TOC

var myLayers = map.getLayer("myLayers ");

if (myLayers !== undefined) {

myLayers .setVisibility(false);

myLayers .setOpacity(0.7);

tocEORI = new TOC({

map: map,

layerInfos: [{

layer: myLayers ,

title: "Enhanced Oil Recovery Institute",

collapsed: true,

slider: false

}

]

}, 'tocmyLayers Div');

tocmyLayers .startup();

}

else {

alert("The service is not available. Please refresh at a later time. This will not affect the overall functionality of the map.");

}