topic How do a returned layer number to my web service url? in ArcGIS JavaScript Maps SDK Questions

How do a returned layer number to my web service url?

ChrisSergent — Sun, 12 Dec 2021 02:49:55 GMT

I have the following code and the script evaluate which layer is Support. In this case it is one. I would like to assign that value through JavaScript as opposed to hard coding it. jsonValue does give me what I want, but I can't figure out how to assign the number to the supportLayerUrl:

 var jsonValue;
    
    // Get the id of a layer
    var requestHandle = esriRequest({
        url: "http://maps.decaturil.gov/arcgis/rest/services/test/StreetSignTest/FeatureServer/",
        content: {
            f: 'json'
        },
        handleAs: "json"
    });


    requestHandle.then(function (lyrJSON, io) {
        for (var i = 0; i < lyrJSON.layers.length; i++) {
            if (lyrJSON.layers.name = "Support") {
                jsonValue = lyrJSON.layers.id;


            }
        }
        return jsonValue;
    })


    function checkValue() {
        alert(jsonValue);
    }
    


    // app configuration  
    var config = {


        mapOptions: {
            showAttribution: false,
            sliderStyle: "small",
            extent: initialExtent,
            logo: false,
            sliderPosition: "bottom-right"
        },


        signLayerUrl: "http://maps.decaturil.gov/arcgis/rest/services/test/StreetSignTest/FeatureServer/0",
        
        supportLayerUrl: "http://maps.decaturil.gov/arcgis/rest/services/test/StreetSignTest/FeatureServer/1" 


    };

I would like for my supportLayerUrl be something like this:

supportLayerUrl: "http://maps.decaturil.gov/arcgis/rest/services/test/StreetSignTest/FeatureServer/" + jsonValue

But I get jsonValue not defined. Any ideas?

Re: How do a returned layer number to my web service url?

RobertScheitlin__GISP — Sun, 12 Dec 2021 02:49:58 GMT

Chris,

Here is simple sample that does this:

<!DOCTYPE html>
<html>
<head>
  <title>Get ArcGIS Server Map Service Layers</title>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
  <link rel="stylesheet" href="http://js.arcgis.com/3.13/esri/css/esri.css">
  <style>
    body{
      font-family: "Arial Unicode MS, Arial, sans-serif";
    }
    #content {
      width: 800px; height: 350px; padding: 5px; overflow: auto;
      border: solid 2px #AAAAAA; background-color: #FFFFFF;
      -moz-border-radius: 5px; -webkit-border-radius: 5px; -o-border-radius: 5px; border-radius: 5px;
      -moz-box-shadow: 0 0 0.5em black; -webkit-box-shadow: 0 0 0.5em black; -o-box-shadow: 0 0 0.5em black; box-shadow: 0 0 0.5em black;
    }
    .failure { color: red; }
    #status { font-size: 12px; }
  </style>

  <script src="http://js.arcgis.com/3.13/"></script>
  <script>
    require(["dojo/dom", "dojo/on", "dojo/dom-class", "dojo/_base/json", "dojo/_base/array", "dojo/string", "esri/request", "dojo/_base/lang", "dojo/domReady!"], function(dom, on, domClass, dojoJson, array, dojoString, esriRequest, lang) {

        dom.byId("url").value = "http://maps.decaturil.gov/arcgis/rest/services/test/StreetSignTest/FeatureServer";
        dom.byId("content").value = "";
        //handle the Go button's click event
        on(dom.byId("submitRequest"), "click", getContent);

        function getContent(){
          var contentDiv = dom.byId("content");
          contentDiv.value = "";
          domClass.remove(contentDiv, "failure");
          dom.byId("status").innerHTML = "Querying...";

          //get the url and setup a proxy
          var url = dom.byId("url").value;

          if(url.length === 0){
            alert("Please enter a URL");
            return;
          }

          var requestHandle = esriRequest({
            "url": url,
            "content": {
              "f": "json"
            },
            "callbackParamName": "callback"
          });
          requestHandle.then(requestSucceeded, requestFailed);
        }

        function requestSucceeded(response, io){
          dom.byId("status").innerHTML = "";
          var supportLyrId;
          console.info(response);
          array.some(response.layers, function(lyr){
            if(lyr.name === "Support"){
              supportLyrId = lyr.id;
              return true;
            }
          });

          dom.byId("content").value = "http://maps.decaturil.gov/arcgis/rest/services/test/StreetSignTest/FeatureServer/" + supportLyrId;
        }

        function requestFailed(error, io){
          domClass.add(dom.byId("content"), "failure");
          dojoJson.toJsonIndentStr = " ";
          dom.byId("content").value = dojoJson.toJson(error, true);
        }
    });
  </script>

</head>
<body>
  <p>Enter the URL for a layer in a map service to access metadata about using esriRequest.</p>
  <p>
    <input type="text" id="url" size="105"/>
    <input id="submitRequest" type="button" value="GO" />
    <span id="status"></span>
  </p>
  <p>
    <h2>Content</h2>
    <p>Check the console for the full response. Here is the full support url:</p>
    <textarea id="content"></textarea>
  </p>
</body>
</html>

Re: How do a returned layer number to my web service url?

ChrisSergent — Wed, 13 May 2015 14:43:12 GMT

I had not thought of that. I can just put the return value in a hidden element on my web page and then set the value to that in code. Thanks!