What is a Template in Angular?
💡 Concept Name
Angular Template – Defines the view layer of a component using HTML with Angular's special syntax like interpolation and directives.
📘 Quick Intro
Templates in Angular define what a user sees and interacts with. They are written in HTML but extended with Angular syntax (e.g., interpolation, binding, and structural directives) to connect with component logic.
🧠 Analogy / Short Story
Think of a template like a restaurant menu. The menu (template) shows what dishes (data) are available, but the actual preparation (logic) happens in the kitchen (component).
🔧 Technical Explanation
- 📄 Templates are part of the component metadata and define the structure of the component's view.
- 🔗 They bind to component class properties using interpolation ({{ }}) and property binding ([ ]).
- 🌀 Structural directives like *ngIf and *ngFor control DOM rendering.
- ⚙️ Templates can be inline or defined in external HTML files (templateUrl).
🎯 Purpose & Use Case
- ✅ Display component data to users.
- ✅ Handle user interactions (clicks, input, etc.).
- ✅ Conditionally render UI using *ngIf, *ngFor.
- ✅ Create reusable and modular views.
💻 Real Code Example
// app.component.ts
export class AppComponent {
title = 'Angular Template Example';
items = ['Apple', 'Banana', 'Cherry'];
}<!-- app.component.html -->
<h1>{{ title }}</h1>
<ul>
<li *ngFor="let item of items">{{ item }}</li>
</ul>
❓ Interview Q&A
Q1: What is a template in Angular?
A: It's the HTML view part of a component, extended with Angular syntax.
Q2: How do you bind data in templates?
A: Using interpolation ({{value}}) and binding syntax ([ ]).
Q3: What does *ngIf do in templates?
A: It conditionally renders elements based on a boolean condition.
Q4: Can templates be defined inline?
A: Yes, using the template property in the component decorator.
Q5: What is *ngFor used for?
A: It loops through arrays to render multiple DOM elements.
Q6: What’s the difference between template and templateUrl?
A: template defines inline HTML, templateUrl refers to an external HTML file.
Q7: Can templates use conditional logic?
A: Yes, using directives like *ngIf and ternary operators.
Q8: Are Angular templates dynamic?
A: Yes, they reactively update based on component data changes.
Q9: What happens if you bind to a property that doesn’t exist?
A: Angular will throw an error or ignore the binding depending on the strictness level.
Q10: Can we use events in templates?
A: Yes, using event binding syntax (e.g., (click)="doSomething()").
📝 MCQs
Q1. What does a template define in Angular?
- The logic layer
- The routing rules
- The view layer of a component
- The module
Q2. Which syntax is used for interpolation in Angular templates?
- {{ expression }}
- [[ expression ]]
- ( expression )
- <% expression %>
Q3. What directive is used for looping in Angular templates?
- *ngIf
- *ngRepeat
- *ngSwitch
- *ngFor
Q4. What is the purpose of *ngIf?
- Repeat DOM
- Render text
- Conditionally render elements
- Change class
Q5. Which property defines inline template in @Component?
- templateUrl
- inlineHtml
- html
- template
💡 Bonus Insight
You can also use pipes (e.g., {{ amount | currency }}) in templates to transform data before display, enhancing UX directly in the view layer.
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