How to detect a map service status

[RobertKirkwood]

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!

[RobertScheitlin__GISP]

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/la...";
  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);
  });
  ...
});

[RobertKirkwood]

Thanks. This gets me going in the right direction!

[RobertKirkwood]

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.");

        }

[KenBuja]

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