topic Re: Reading and parsing ... /arcgis/rest/services?f=json in ArcGIS JavaScript Maps SDK Questions

Reading and parsing ... /arcgis/rest/services?f=json

DonBarker — Wed, 07 Sep 2011 16:17:10 GMT

I'd like to write a Javascript function that reads the ArcGIS Server catalog here

http://129.2.24.163/arcgis/rest/services?f=json

in order to insert the map service names into HTML table rows.

Can someone point me to online help specifically for reading and parsing the JSON object that's returned by the above URL?

Thanks,

Re: Reading and parsing ... /arcgis/rest/services?f=json

KellyHutchins — Fri, 10 Dec 2021 20:51:31 GMT

You can use esri.request to get this information. Here's a sample that gets the info and writes it out to the page.

   function init() {

      
     var  baseURL = "http://129.2.24.163/arcgis/rest/services";
        esri.request({
          url:baseURL, 
          content:{f:"json"},
          callbackParamName:"callback",
          load:getServiceDetails, 
          error:esriConfig.defaults.io.errorHandler
        });
      }
      
    function getServiceDetails(response,args){
      var info = [];
      dojo.forEach(response.folders,function(folder){
        info.push("Folder: " +  folder + "<br/>");        
      });
      dojo.forEach(response.services, function(service){
        info.push("Service Details: " + service.name + " " + service.type + "<br/>");
      });

     dojo.byId('serviceDetails').innerHTML = info.join("");
    }
      dojo.addOnLoad(init);

Re: Reading and parsing ... /arcgis/rest/services?f=json

DonBarker — Wed, 07 Sep 2011 17:00:27 GMT

Works great. Thanks, Kelly!

Re: Reading and parsing ... /arcgis/rest/services?f=json

DonBarker — Thu, 08 Sep 2011 20:22:07 GMT

Kelly,

How can I fetch and use the other map service attributes that appear in the JSON object, like:

{"serviceDescription":"","mapName":"","description":"","copyrightText":""

I tried
service.description
service.serviceDescription
service.servicedescription
service.mapName
service.mapname

All render "undefined". I could not find the ref in the API documentation. Can you point the way?

Thanks,

Re: Reading and parsing ... /arcgis/rest/services?f=json

KellyHutchins — Fri, 10 Dec 2021 20:51:34 GMT

Don,

You can get the service details using esri.request with the service url. For example:

      baseURL = "http://129.2.24.163/ArcGIS/rest/services/00_2011_Metadata_Example/MapServer";
        esri.request({
          url:baseURL, 
          content:{f:"json"},
          callbackParamName:"callback",
          load:getLayerDetails, 
          error:esriConfig.defaults.io.errorHandler
        });

In the response that is returned you'll have the service details you see in the rest services directory:
http://129.2.24.163/ArcGIS/rest/services/00_2011_Metadata_Example/MapServer

Re: Reading and parsing ... /arcgis/rest/services?f=json

DonBarker — Mon, 12 Sep 2011 15:09:23 GMT

Sorry I don't quite get it.

I adapted the code for reading REST catalog (that works ok) to reading the map service attributes. My code is below. But nothing writes out to the table cell, not even plain text. What am I doing wrong?

Thanks,
Don

// P.S. Can someone tell me how to wrap code in my posts? I saw that in forum help before but can't find that now. Thanks. //

function init() {
     baseURL = "http://129.2.24.163/ArcGIS/rest/services/00_CRH03/MapServer";
       esri.request({
         url:baseURL,
         content:{f:"json"},
         callbackParamName:"callback",
         load:getLayerDetails,
         error:esriConfig.defaults.io.errorHandler
       });
     }
   function getLayerDetails(response,args){
     var info = [];
     dojo.forEach(response.services, function(service){
       info.push(
       "<tr><td>" + service.serviceDescription + "</td></tr>");
     });
    dojo.byId('mapServiceTable').innerHTML = info.join("");
   }
     dojo.addOnLoad(init);
</script>
</head>
<body>

<table id="mapServiceTable">
</table>
</body>

Re: Reading and parsing ... /arcgis/rest/services?f=json

JeffPace — Mon, 12 Sep 2011 15:14:57 GMT

Your problem is the esri.request returns A service (not services), so your for Loop has nothing to loop over (its a json response, not an array).

try

function getLayerDetails(response,args){
alert(response.serviceDescription);
}

or just alert your response to see what it contains.