In AngularJS, $stateParams is a service provided by the ui-router library that allows you to access parameters passed in the URL, including query parameters. If you are trying to access a query parameter using $stateParams and it's returning as undefined, there are a few things you can check:

  1. Verify Query Parameter in URL: Make sure that the query parameter you are trying to access is present in the URL. Query parameters in AngularJS are typically specified after the ? symbol in the URL. For example, in the URL, the query parameter param has the value value.

  2. Ensure Correct State Configuration: In your ui-router state configuration, ensure that you have correctly defined the state and included the parameter in the URL pattern. For example:

    $stateProvider.state('mystate', { url: '/mystate?param', // ... });
  3. Inject $stateParams: Ensure that you have injected the $stateParams service into the controller or service where you are trying to access the query parameter. For example:

    // Controller or service definition myApp.controller('MyController', ['$scope', '$stateParams', function($scope, $stateParams) { // Use $stateParams here to access the query parameters var paramValue = $stateParams.param; }]);
  4. Check Parameter Name: Ensure that the parameter name you are using to access the query parameter matches the one you defined in the state configuration and the URL. Query parameters are case-sensitive, so the name must match exactly.

  5. URL Encoding: If your query parameter contains special characters or spaces, make sure it is properly URL-encoded before being passed in the URL. You can use JavaScript's encodeURIComponent() function to encode the parameter value.

If you have verified these points and are still encountering the issue, double-check your code to see if there are any other factors that could be affecting the retrieval of the query parameter. If you provide more details about your state configuration and how you are trying to access the parameter, I can provide more specific assistance.

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