This is an example of an External Data Service Implementation for IBM Case Manager using Node.js

choicelist-data.js

{
  displayName: 'Genders',
  choices:
   [ { value: 'Female', displayName: 'Female' },
     { value: 'Male', displayName: 'Male' },
     { value: 'Other', displayName: 'Other' } ],
}

choicelist-example.js

// Add this at the top of your file, with the rest of the requires:

var choicelist = require("./choicelist.js")

// Add this to your implementation:

var genders = choicelist.create("Genders");

// Add each value to the list 

choicelist.addChoice(genders, "Female", "Female"); // Display name is optional
choicelist.addChoice(genders, "Male");
choicelist.addChoice(genders, "Other");

// Or add them all at once

choicelist.addChoices(genders, ["Female", "Male", "Other"] );		

// And attach the choice list to the property
property.choiceList = genders;
dataResponse.properties.push(property);

choicelist.js

var create = (displayName) => {
	return {
		displayName,
		choices: []
	}
}
 
var addChoice = (choiceList, value, displayName) => {
	choiceList.choices.push( 
		{
			value,
			displayName: displayName || value
		});
}

var addChoices = (choiceList, values) => {
	values.forEach( (value) => addChoice(choiceList, value) );
}

module.exports = {
	create,
	addChoice,
	addChoices
}

nodecm.js

var express = require('express')
	, bodyParser = require('body-parser')
	, _= require("underscore")
	, http = require('http')
	, morgan = require('morgan');
    
var jsonParser = bodyParser.json();

var app = express();
app.use(morgan("dev")); // Change this for production code
app.set('port', process.env.PORT || 3000);

app.post('/type/:objectType', jsonParser, function(req, res) {

	console.log(req.body); // Remove this for production code
	
	var dataResponse = {
		"externalDataIdentifier": "Node EDS",
		"properties" : [ ]
	};

	// Add your implementation code here
	
	console.log(dataResponse);  // Remove this for production code
	res.json(dataResponse);	
});

function getProperty(req, name) {
	return _.findWhere(req.body.properties, {"symbolicName" : name} );
}

http.createServer(app).listen(app.get('port'), function(){
	console.log('Node EDS server listening on port ' + app.get('port'));
});

request.js

{
	repositoryId: 'TARGET',
	requestMode: 'initialNewObject',
	properties: [
		{
			symbolicName: 'Creator',
			value: null
		},
		{
			symbolicName: 'DateCreated',
			value: null
		},

		// A lot more system properties...
                
		{
 			symbolicName: 'TST_TestProp',
			value: null
		},
		{
			symbolicName: 'TST_ExternalProperty1',
			value: null
		}],
		clientContext: {
			currentSolution: 'TestSolution',
			role: 'TestRole'
		}
}

response.js

{
	externalDataIdentifier: 'NodeEDS',
	properties: [
		{
			symbolicName: 'TST_ExternalProperty1',
			value: 'Sat Apr 08 2017',
			displayMode: 'readonly'
		}
	]
}

simple-example.js

var dataResponse = {
	"externalDataIdentifier": "Node EDS",
	"properties" : []
};

var property = getProperty(req, "TST_ExternalProperty1");
if (property) {
	property.value = (new Date()).toDateString();
	property.displayMode = "readonly";
	dataResponse.properties.push(property);
}