Issue: $injector:unpr Unrecognized Provider DataServiceProvider (a provider that has not been defined before)

Encountering this issue:

Error: [$injector:unpr] http://errors.angularjs.org/1.5.6/$injector/unpr?p0=DataServiceProvider%20%3C-%20DataService%20%3C-%20SignupController

Suspecting that the problem lies in the fact that DataService cannot be found due to being defined in a separate directory. Or could it be a case of incorrect definition?

SignUpController (part of the main app, located in src/public/xxx/xxx.controller.js):

var app = angular.module('app');  

SignupController.$inject = ['DataService'];
function SignupController(DataService) {
    // implementation
}

app.controller("SignupController", SignupController);

DataService resides in data/dataservice.js

function DataService(){
    // implementation
}
var datamodule=angular.module('data');
datamodule.service('DataService',DataService);

Assuming 'data' has been properly declared in data/data.module.js

angular.module('data', []);

and has been incorporated into the main app in src/public/xxx/xxx.js

angular.module('app', ['ui.router', 'common','data']);

Order of References:

<script src="data/data.module.js" type="text/javascript"></script>
<script src="data/dataservice.js" type="text/javascript"></script>
<script src="src/public/xxx.js" type="text/javascript"></script>
<script src="src/public/xxx/xxx.controller.js" type="text/javascript"></script>

Answer №1

It is crucial to pay attention to the order in which you import JavaScript files. Make sure to import the data/dataservice.js file before any other JavaScript files that will be utilizing this service or injecting it into the code.

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