How can I override the downloaded angular.js factory using dev tools? I need to add some client-side log statements but cannot deploy any code. Updating normal Javascript functions in console is easy, but I'm struggling with angular.js factories.
While it may seem impossible, there are actually ways to modify Angular services, which are normally singletons. Once a service is instantiated, the instance is typically stored in a private variable with no direct way to override it.
However, if the factory was created as an object with multiple methods, these methods can be monkey-patched for modification:
var factory = angular.element(document.querySelector('.ng-scope'))
.injector()
.get('factoryName');
var factoryMethod = factory.methodName;
factory.methodName = function () {
console.log(arguments);
return factoryMethod.apply(factory, arguments);
};
In alternative scenarios, it's possible to intercept the app during its bootstrapping process using tools like Greasemonkey or Tampermonkey. This allows for the replacement of components from the original module with a new module, or adding a new config block to the original module where a defined factory can be modified using $provide.decorator or redefined with $provide.factory.
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