JavaScript Troubleshooting: Fixing the "Uncaught error: undefinedModule" Issue

Currently, I'm utilizing a Javascript file in an attempt to acquire a token from ArcGIS Online. Unfortunately, each time I give it a shot, the following error is returned:

init.js:11 Uncaught Error: undefinedModule

The Javascript file (GetAToken.js) in question is displayed below:

dojo.ready(init);
var request = dojo.require('request'); // npm install request

// function to generate a token using client id and client secret
function getToken(callback) {
    request.post({
        url: 'https://www.arcgis.com/sharing/rest/oauth2/token/',
        json: true,
        form: {
            'f': 'json',
            'client_id': '<<MY_CLIENT_ID>>',
            'client_secret': '<<MY_CLIENT_SECRET>>',
            'grant_type': 'client_credentials',
            'expiration': '1440'
        }
    }, function (error, response, body) {
        console.log(body.access_token);
        callback(body.access_token);
    });
}

In addition, here is the section of code that invokes this function (placed within an HTML file):

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<script src="https://esri.github.io/calcite-bootstrap/assets/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://js.arcgis.com/4.0/esri/css/main.css">
<script src="https://js.arcgis.com/4.0/"></script>
<script src="GetAToken.js">
    var MyToken = callback(getToken);
    alert(MyToken);
</script>

Answer №1

Seems like you're attempting to acquire the requestJS library through NodeJS (npm install request). Am I correct?

You should note that NodeJS require utilizes CommonJS while Dojo uses RequireJS, each with its own module structures. For more information, check out this link

The error is occurring because in the line

var request = dojo.require('request');
, it can't find the request module.

To import nodejs modules in Dojo, use dojo/node as shown below.

require([ "dojo/node!request" ], function(request){
    // Use the "request" module
});

Refer to the tutorial for Dojo and Node.js here

I hope this information was beneficial to you.

PS: Esri provides its own request object (esri/request) which you can utilize for obtaining tokens - consider using that instead.

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