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RainerHahnekamp Deep Dive Change Detection Rainer Hahnekamp - 29. February 2024 - ngOslo

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RainerHahnekamp About Me... Professional NgRx https://www.youtube.com/ @RainerHahnekamp https://www.ng-news.com https://github.com/softarc-consulting/sheriff ● Rainer Hahnekamp ANGULARarchitects.io ● Developer / Trainer / Speaker Modern Spring for Angular @RainerHahnekamp

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RainerHahnekamp Component Tree Web Application Submit Cancel Change Detection

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RainerHahnekamp Component Tree Web Application Submit Cancel Change Detection

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RainerHahnekamp Component Tree Web Application Submit Cancel Change Detection

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RainerHahnekamp Component Tree Web Application Submit Cancel Change Detection

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RainerHahnekamp Component Tree Web Application Submit Cancel Change Detection

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RainerHahnekamp Component Tree Web Application Submit Cancel Change Detection

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RainerHahnekamp Component Tree Web Application Submit Cancel Change Detection

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RainerHahnekamp Component Tree Web Application Submit Cancel Change Detection

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RainerHahnekamp Component Tree Web Application Submit Cancel Change Detection

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RainerHahnekamp Triggers for Change Detection Handled DOM Events Asynchronous Tasks

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RainerHahnekamp 1. Change Detection with Default Strategy = OnPush = Default 1. Waiting for Events 3. Dirty Marking 4. Change Detection zone.js 2. Event Happens

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RainerHahnekamp Change Detection: OnPush ● Only checks if Component is dirty ● No dirty marking by asynchronous task!

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RainerHahnekamp 2. Change Detection: Click Event in Default Component = OnPush = Default 1. Waiting for Events 3. Dirty Marking 4. Change Detection zone.js 2. Event Happens

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RainerHahnekamp 3. Change Detection: Click Event in OnPush Component = OnPush = Default 1. Waiting for Events 3. Dirty Marking 2. Event Happens 4. Change Detection zone.js

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RainerHahnekamp Criteria markForCheck Immutable Property Binding Handled DOM Events async Pipe Signal Change (Local Change Detection) manually via markForCheck

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RainerHahnekamp 4. Local Change Detection: Signal Change in OnPush Component = OnPush = Default 1. Waiting for Events 3. Dirty Marking 4. Change Detection zone.js 2. Event Happens

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RainerHahnekamp Change Detection in the Future ● Careful with OnPush with zone.js ● "Acceptable" with upcoming Scheduler ● Simple & Easy with upcoming Signal Components

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RainerHahnekamp Further Reading and Watching https://medium.com/ngconf/ngrx-signal-store-the-mis sing-piece-to-signals-ac125d804026 https://youtu.be/0PJPZ3rLqrY