Lifecycle Hooks in Angular

Chandan kumarChandan kumar
2 min read

Table of contents

Angular’s lifecycle hooks are methods in Angular components and directives that allow you to tap into key moments in the lifecycle of a component or directive. Below is a description of the main lifecycle hooks with their execution order and a graph to illustrate their flow:

Key Lifecycle Hooks in Angular

  1. ngOnChanges:

  • Triggered when the input properties of a component or directive are changed.

  • Receives a SimpleChanges object containing the previous and current values of the bound inputs.

2. ngOnInit:

  • Called once, after the first ngOnChanges.

  • Used for initialization logic that requires input properties to be set.

3. ngDoCheck:

  • Called during every change detection run, after ngOnChanges and ngOnInit.

  • Used to detect changes that Angular does not.

4. ngAfterContentInit:

Called once after the content (e.g., <ng-content>) is projected into the component.

  • Used for logic that depends on projected content.

5. ngAfterContentChecked:

Called after every check of the projected content.

  • Used for logic that depends on content changes.

6. ngAfterViewInit:

Called once after the component’s view and its children have been initialized.

  • Useful for interacting with child components or DOM elements.

7. ngAfterViewChecked:

  • Called after the view (and child views) have been checked.

  • Used for logic that depends on view changes.

8. ngOnDestroy:

  • Called just before the component or directive is destroyed.

  • Used for cleanup tasks, like unsubscribing from observables or detaching event handlers.

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Chandan kumar
Chandan kumar

Hello, World! 👋 I'm Chandan Kumar, a passionate and results-driven MEAN stack web developer with a strong background in designing and implementing web applications that deliver exceptional user experiences. I'm dedicated to staying at the forefront of web development trends and technologies to create cutting-edge solutions for my clients. My Expertise: MEAN Stack Development: I specialize in building robust web applications using MongoDB, Express.js, Angular, and Node.js. This full-stack approach allows me to create seamless, end-to-end solutions that meet and exceed client expectations. Front-end Excellence: I have a keen eye for UI/UX design and a deep understanding of front-end technologies such as HTML5, CSS3, and JavaScript. I leverage these skills to craft engaging, responsive, and user-friendly interfaces. Back-end Proficiency: With extensive experience in server-side scripting, API development, and database management, I ensure that the applications I build are not only visually appealing but also highly performant and secure. Problem Solver: I thrive on challenges and enjoy solving complex problems. Whether it's optimizing code for efficiency or troubleshooting issues, I'm committed to finding innovative solutions. My Mission: My mission is to create digital experiences that make a meaningful impact. I'm passionate about collaborating with teams and clients to turn ideas into reality. I believe that technology can empower businesses and individuals alike, and I'm excited to be a part of that journey. Let's Connect: I'm always open to networking and exploring opportunities for collaboration. Whether you're interested in discussing a potential project, sharing insights, or simply connecting with fellow professionals in the tech industry, feel free to reach out. Let's connect and start a conversation! Contact Information: 📩 Email: chandanku845415@gmail.com 📱 LinkedIn: developerchandan 🌐 Portfolio: developerchandan.github.io ✍️ Medium: developerchandan Thank you for visiting my profile, and I look forward to connecting with you!