问题
I'm trying to do upgrade components written in AngularJS1 to Angular6. I'm taking the approach of having the wrappers for all the existing AngularJS1 component by extending "UpgradeComponent" placed under the folder "directive-wrappers" in my example. When I try to add some controllers which doesn't have any directives, I get the error message
Error: [$injector:unpr] Unknown provider: testDirective2DirectiveProvider <- testDirective2Directive
https://errors.angularjs.org/1.7.8/$injector/unpr?p0=testDirective2DirectiveProvider%20%3C-%20testDirective2Directive
at eval (angular.js:138)
at eval (angular.js:4924)
at Object.getService [as get] (angular.js:5084)
at eval (angular.js:4929)
at Object.getService [as get] (angular.js:5084)
at Function.UpgradeHelper.getDirective (upgrade_helper.ts:56)
at new UpgradeHelper (upgrade_helper.ts:52)
at TestDirective2Wrapper.UpgradeComponent (upgrade_component.ts:106)
at new TestDirective2Wrapper (TestDirective2Wrapper.ts:27)
at createClass (provider.ts:265) "<app-root _nghost-c69="">"
I tried adding studentController and homePageController, but not able to load it. Any ideas why I'm facing this issue? https://stackblitz.com/edit/ng6hybrid-c8h6uv
回答1:
There are two issues that need to be addressed. First, in the studentController.js file, you are using the var mainApp = angular.module("testApp", []); syntax which is resetting the AngularJS module and everything that got instantiated before is being removed.
To answer your question about the controllers, AngularJS controllers can't be upgraded directly using UpgradeComponent (see https://angular.io/guide/upgrade#using-angularjs-component-directives-from-angular-code) because they aren't components/directives that have a template. That is why the error you get (after fixing the first issue) is Unknown provider: studentControllerDirectiveProvider <- studentControllerDirective. It can't find a directive for the reference studentController, so it is adding Directive to see if that has anything.
To fix this, either convert the controller in AngularJS to a directive with a template, or convert it to a service in AngularJS and then inject it into Angular using the UpgradeModule. Keep in mind you will need a template somewhere for this controller so it can be upgraded to Angular. Please see a working example of this in my stackblitz below.
https://stackblitz.com/edit/ng6hybrid-zs6waw?file=app%2Fdirective-wrappers%2FstudentControllerWrapper.ts
来源：https://stackoverflow.com/questions/58369756/error-while-loading-controllers-migrating-angularjs1-to-angular6