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That directly translates to zero performance impacts! This means there is no tight coupling between the $digest cycle and ngZone for change detection.
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Use state management via dependency injection - We can utilize the dependency injection system that Angular provides to link any elements on the page to any state management store of your choice.Consume it anywhere - Angular elements can be consumed anywhere in a browser, regardless of framework.
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Instead, we needed something flexible, reliable, and decoupled from our existing application so they would not impact our other development teams.īut what could that possibly be? Enter: Angular Elementsīack when Angular v6 was released, Rob Wormald gave an exciting talk at NgConf 2018 that touched on the advancements web components (a set of DOM APIs that encompass custom elements) and listed a number of reasons how Angular could empower developers to create highly portable, web framework-agnostic widgets.
IS IT POSSIBLE TO KNOW ANGULARJS IF YOU DONT KNOW JS UPGRADE
Similarly, if an Angular change detection cycle is triggered by a (click)event, AngularJS will go through a full $digest cycle.įor those reasons, we do not find ngUpgrade to be a viable upgrade strategy for our use case. For example, if the AngularJS $digest cycle is triggered by an ng-click event, Angular will go through a full change detection cycle. Teams would need to compete for namespace within the $injector, and coordinating an upgrade schedule would be next to impossible.Īdditionally, the UpgradeModule tightly couples the two frameworks together, causing performance impacts when either frameworks’ lifecycle hooks are invoked. However, because we have multiple teams upgrading their own features - with complex dependency graphs - this creates risk. This allows for both frameworks to communicate with each other during the upgrade/downgrade process. The UpgradeModule uses the AngularJS $injector to register Angular components.
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This would have prevented our development efforts from being scalable and independent while on a large platform with many contributors. More specifically, having two AngularJS components being upgraded on the page at the same time is not possible from a technical standpoint with ngUpgrade approach. The UpgradeModule library does not allow for multiple development teams to contribute to the same repository while upgrading simultaneously. Some of you might ask, “Wait, why Angular elements? Why aren’t you using the ngUpgrade approach instead?!?!”. These are completely valid questions. To achieve this, we are using Angular elements as a migration tool.īefore we dive in, this article assumes that you have general knowledge and understanding of AngularJS, Angular, and various upgrade strategies. In order to accomplish this migration successfully, we are developing a process to upgrade and build new features in a modular way, while not impeding the continual development of our platform. Because of this transition, we put urgency behind our planned migration from AngularJS to Angular. In July 2018, active feature development for AngularJS came to an end and entered into Long Term Support (LTS). At Capital One, a large part of our major servicing platform is built with AngularJS, and we are continually adding new features to our platform everyday.