How to return value from nested function to parent function?

Question

I have the following code working, but I need to return the value of the resultant "fieldInfos" string to the createFieldInfos() function and I'm not sure how to do that. Can anyone point me in the right direction?

Thanks,
Joanfunction createFieldInfos() {
 console.log("-->inside createFieldInfos function");
 var endpoint = "http://gis.tpcmaps.org/ArcGIS/rest/services/LandUse/Existing_Land_Use/MapServer/0";

var jsonobject = esri.request({
  url: endpoint,
  content: { f: 'json' },
  callbackParamName: 'callback',
  load: processServiceInfo,
  error: errorHandler  
 });
 console.log("jsonobject: " + jsonobject);
}

function processServiceInfo(info) {
 console.log('layer info: ', info);
 console.log("info.name: " + info.name + ",info.id: " + info.id);

fieldInfos += "],";
 console.log("fieldInfos: " + fieldInfos);
}
function errorHandler(err) {
    console.log('error: ', err);
}

VinayBansal · Answer

Remove load and error function from jsonObject declarationvar jsonobject = esri.request({
  url: endpoint,
  content: { f: 'json' },
  callbackParamName: 'callback'
});

VinayBansal · Answer

Try this codefunction createFieldInfos() {
 console.log("-->inside createFieldInfos function");
 var endpoint = "http://gis.tpcmaps.org/ArcGIS/rest/services/LandUse/Existing_Land_Use/MapServer/0";

var jsonobject = esri.request({
  url: endpoint,
  content: { f: 'json' },
  callbackParamName: 'callback',
  load: processServiceInfo,
  error: errorHandler  
 });
 console.log("jsonobject: " + jsonobject);
return jsonobject.then(processServiceInfo, errorHandler);
}

function processServiceInfo(info) {
 console.log('layer info: ', info);
 console.log("info.name: " + info.name + ",info.id: " + info.id);

fieldInfos += "],";
 console.log("fieldInfos: " + fieldInfos);
return fieldInfos;
}
function errorHandler(err) {
    console.log('error: ', err);
return null;
}

JeffJacobson · Answer

Try this:function createFieldInfos() {
    var endpoint, jsonobject, fieldInfos = "";

function processServiceInfo(info) {
        console.log('layer info: ', info);
        console.log("info.name: " + info.name + ",info.id: " + info.id);
        fieldInfos += "[";

dojo.forEach(info.fields, function (field) {
            console.log("Name: " + field.name + ", Alias: " + field.alias);
            if (field.name != "Shape" & field.name != "OBJECTID") {
                fieldInfos += "{'fieldName': '" + field.name + "',";
                fieldInfos += "'label': '" + field.alias + "',";
                fieldInfos += "'visible':" + true + "},";
            }
        });

fieldInfos += "],";
        console.log("fieldInfos: " + fieldInfos);
    }

function errorHandler(err) {
        console.log('error: ', err);
    }

console.log("-->inside createFieldInfos function");
    endpoint = "http://gis.tpcmaps.org/ArcGIS/rest/services/LandUse/Existing_Land_Use/MapServer/0";

jsonobject = esri.request({
        url: endpoint,
        content: {
            f: 'json'
        },
        callbackParamName: 'callback',
        load: processServiceInfo,
        error: errorHandler
    });
    console.log("jsonobject: " + jsonobject);
}