AngularJS Basics and Directives

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Questions and Answers

What is the primary purpose of the ng-repeat directive in AngularJS?

To bind application data to HTML attributes
To validate form inputs
To display tables by iterating over a collection (correct)
To create a two-way binding for input elements

How does the ng-disabled directive function in AngularJS?

It forms a validation method for input fields
It binds application data to the disabled state of an element (correct)
It automatically generates DOM elements
It creates a new property in the controller

Which directive is used to bind a checkbox's value to the application in AngularJS?

ng-model (correct)
ng-show
ng-repeat
ng-click

What is true about radio buttons in AngularJS?

Only the selected one will be used for the ng-model (C) Signup and view all the answers

What is the role of the ng-model directive in AngularJS forms?

It binds the value of a control to the application model (B) Signup and view all the answers

What type of data binding allows changes to flow only from the model to the view?

One Way Data Binding (B) Signup and view all the answers

Which directive is used for data binding in AngularJS?

ng-model (D) Signup and view all the answers

What feature of AngularJS allows the application state to be encoded in the URL?

Deep Linking (A) Signup and view all the answers

Which of the following statements about Two Way Data Binding is correct?

It facilitates the flow of data in both directions. (B) Signup and view all the answers

What is the primary role of the dependency injection subsystem in AngularJS?

To simplify the creation and testing of applications (A) Signup and view all the answers

Which type of data binding is characterized by a unidirectional flow of data?

One Way Data Binding (B) Signup and view all the answers

What happens to the view when a change is made to the model in Two Way Data Binding?

The view updates to reflect the change. (A) Signup and view all the answers

How does Data Binding function in AngularJS?

It serves as a bridge between model and view without additional coding. (B) Signup and view all the answers

What is the purpose of event binding in AngularJS?

To allow components to listen to user events. (B) Signup and view all the answers

Which statement describes a benefit of using AngularJS?

It facilitates the creation of Single Page Applications. (A) Signup and view all the answers

In the MVC architecture of AngularJS, what is the primary role of the Model?

To manage application data. (D) Signup and view all the answers

What happens when a user disables JavaScript in an AngularJS application?

The basic HTML page will be displayed without dynamic content. (C) Signup and view all the answers

What is a significant disadvantage of Single Page Applications (SPAs)?

They experience slower initial load times. (A) Signup and view all the answers

What is a significant disadvantage of using AngularJS?

It is not secure without server-side authentication. (C) Signup and view all the answers

Which feature of AngularJS is responsible for automatic synchronization between model and view?

Data-binding (B) Signup and view all the answers

Which component in the MVC architecture interacts directly with both the Model and the View?

Controller (A) Signup and view all the answers

What is a common challenge associated with SPAs in terms of SEO?

Difficulty in serving pre-rendered content. (A) Signup and view all the answers

Which AngularJS feature allows the creation of custom HTML tags?

Directives (A) Signup and view all the answers

What does the separation of concerns concept in AngularJS achieve?

It isolates application logic from the user interface. (A) Signup and view all the answers

What primary function do services such as $http serve in AngularJS?

To facilitate making XML Http Requests. (A) Signup and view all the answers

Which method is called when an event is triggered by the user in AngularJS event binding?

updateproduct() (B) Signup and view all the answers

What design pattern does AngularJS utilize to separate responsibilities in an application?

Model View Controller (MVC) (A) Signup and view all the answers

Why are older browsers problematic for SPAs?

They may not fully support certain JavaScript features. (B) Signup and view all the answers

What aspect of AngularJS assists in switching views within an application?

Routing (A) Signup and view all the answers

What is the primary function of the AngularJS ng-app directive?

To initialize or bootstrap the application (D) Signup and view all the answers

Which AngularJS directive is used to bind application data to HTML input controls?

ng-model (B) Signup and view all the answers

How does the ng-repeat directive function in AngularJS?

It performs operations on HTML elements for each item in a collection (B) Signup and view all the answers

What is the purpose of the ng-init directive in an AngularJS application?

To assign initial values to variables (C) Signup and view all the answers

Which one of the following is NOT a directive provided by AngularJS?

ng-fetch (B) Signup and view all the answers

What does the ng-bind directive do in an AngularJS application?

Binds the HTML content to application data (B) Signup and view all the answers

Which of the following is essential for defining the root element of an AngularJS application?

ng-app (C) Signup and view all the answers

For which scenario is the ng-repeat directive most useful?

Displaying a collection of items dynamically in HTML (C) Signup and view all the answers

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Study Notes

AngularJS Overview

Developed in 2009 by Misko Hevery and Adam Abrons, now maintained by Google.
Efficient framework for creating Rich Internet Applications (RIAs).
Follows a clean Model-View-Controller (MVC) architecture, supporting cross-browser compliance.

Data Binding

Data Binding: Synchronizes data between model and view components automatically.
ng-model Directive: Binds input controls (text fields, checkboxes) to the application model.
Types of Data Binding:
- One Way Binding: Data flows from model to view only; view changes do not sync back.
- Two Way Binding: Data flows bidirectionally; changes in model update view and vice versa.

Directives

AngularJS directives are special attributes starting with "ng-" that enhance HTML functionality.
Common directives include:
- ng-app: Initializes and links AngularJS application to the HTML.
- ng-repeat: Repeats HTML elements for each item in a collection.
- ng-disabled: Controls the disabled state of elements based on model data.
- ng-bind: Binds application data to HTML elements.

Form Handling

Forms in AngularJS allow for data-binding and validation of input controls like inputs, selects, buttons, and textareas.
ng-model is essential for binding values of input elements.

Routing and Views

Routing enables switching between different views in a single-page application (SPA).
Supports deep linking to encode application state in URLs, ensuring bookmarks can restore app state.

Core Features

Scope: Acts as a bridge between controllers and views, representing the application model.
Services: Built-in services (e.g., $http) for making HTTP requests, instantiated once within the app.
Filters: Select subsets of items from arrays, returning new arrays.
Templates: Renderable views with information from controllers and models.

Advantages and Disadvantages

Advantages:
- Facilitates creation of SPAs in a maintainable way.
- Provides rich user experience through data binding.
- Supports unit testing and separation of concerns through dependency injection.
Disadvantages:
- Applications can be insecure if reliant solely on client-side JavaScript; necessitates server-side authentication.
- Non-degradable experience without JavaScript enabled.

MVC Architecture in AngularJS

Model: Maintains application data.
View: Displays data as instructed by the controller.
Controller: Handles user input and manipulates the model to prepare data for the view.

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