Angular Material Interview Questions and Answers for 5 years experience

1. What is Angular Material?

   • Answer: Angular Material is a UI component library built by Google for Angular applications. It implements Google's Material Design specifications, providing pre-built, ready-to-use UI components that follow consistent design principles, ensuring a visually appealing and user-friendly experience.

2. How do you install Angular Material in an Angular project?

   • Answer: You install Angular Material using the Angular CLI. First, you need to install the necessary packages: ng add @angular/material. This command automatically installs the required modules and updates your `angular.json` file. You might also need to import specific modules into your components.

3. Explain the difference between `mat-button` and ``?

   • Answer: `mat-button` is a flat button, while `

   ` is a raised button. The raised button has a more prominent appearance, providing better visual feedback to the user. Both are Angular Material components implementing Material Design button styles.

4. How do you customize the theme of an Angular Material application?

   • Answer: Angular Material uses a theming system based on Sass. You can customize the theme by creating a custom theme file (e.g., `my-theme.scss`) and overriding existing variables or defining new ones. Then, you include this custom theme in your `angular.json` or `styles.scss` file.

5. Describe the `MatFormFieldModule` and its purpose.

   • Answer: `MatFormFieldModule` provides the `mat-form-field` component, which is a wrapper for input fields, textareas, and select elements. It improves the appearance and usability of these form controls by adding labels, hints, error messages, and consistent styling according to Material Design guidelines.

6. Explain how to use `MatPaginator` with a `MatTable`.

   • Answer: You import `MatPaginatorModule` and use the `` component along with your ``. You then need to provide the `MatPaginator` instance to the `mat-table` using the `[pageSizeOptions]` and `[length]` inputs to control pagination behavior. Data is typically fetched in chunks according to the page size and current page number.

7. How do you implement drag-and-drop functionality using Angular Material?

   • Answer: Angular Material provides `CdkDrag` and `CdkDropList` directives from the `@angular/cdk/drag-drop` module. You add these directives to the elements you want to drag and drop, and they handle the drag-and-drop logic automatically. You typically manage data changes in your component based on drag events.

8. What are the different types of Angular Material dialogs?

   • Answer: Angular Material provides `MatDialog` for creating dialogs. While there isn't a strict classification of "types," you can create various dialogs by customizing their content and behavior. Common examples include confirmation dialogs, information dialogs, and forms within dialogs.

9. Explain how to use `MatAutocomplete`.

   • Answer: `MatAutocomplete` is used to provide suggestions to the user as they type. It works in conjunction with `MatInputModule` and a data source (typically an `Observable`). You bind the `matAutocomplete` to the `input` and use `options` to provide the suggestion list. The suggestions are filtered based on the input value.

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