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?

    <p>Only the selected one will be used for the ng-model</p> Signup and view all the answers

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

    <p>It binds the value of a control to the application model</p> Signup and view all the answers

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

    <p>One Way Data Binding</p> Signup and view all the answers

    Which directive is used for data binding in AngularJS?

    <p>ng-model</p> Signup and view all the answers

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

    <p>Deep Linking</p> Signup and view all the answers

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

    <p>It facilitates the flow of data in both directions.</p> Signup and view all the answers

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

    <p>To simplify the creation and testing of applications</p> Signup and view all the answers

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

    <p>One Way Data Binding</p> Signup and view all the answers

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

    <p>The view updates to reflect the change.</p> Signup and view all the answers

    How does Data Binding function in AngularJS?

    <p>It serves as a bridge between model and view without additional coding.</p> Signup and view all the answers

    What is the purpose of event binding in AngularJS?

    <p>To allow components to listen to user events.</p> Signup and view all the answers

    Which statement describes a benefit of using AngularJS?

    <p>It facilitates the creation of Single Page Applications.</p> Signup and view all the answers

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

    <p>To manage application data.</p> Signup and view all the answers

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

    <p>The basic HTML page will be displayed without dynamic content.</p> Signup and view all the answers

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

    <p>They experience slower initial load times.</p> Signup and view all the answers

    What is a significant disadvantage of using AngularJS?

    <p>It is not secure without server-side authentication.</p> Signup and view all the answers

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

    <p>Data-binding</p> Signup and view all the answers

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

    <p>Controller</p> Signup and view all the answers

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

    <p>Difficulty in serving pre-rendered content.</p> Signup and view all the answers

    Which AngularJS feature allows the creation of custom HTML tags?

    <p>Directives</p> Signup and view all the answers

    What does the separation of concerns concept in AngularJS achieve?

    <p>It isolates application logic from the user interface.</p> Signup and view all the answers

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

    <p>To facilitate making XML Http Requests.</p> Signup and view all the answers

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

    <p>updateproduct()</p> Signup and view all the answers

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

    <p>Model View Controller (MVC)</p> Signup and view all the answers

    Why are older browsers problematic for SPAs?

    <p>They may not fully support certain JavaScript features.</p> Signup and view all the answers

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

    <p>Routing</p> Signup and view all the answers

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

    <p>To initialize or bootstrap the application</p> Signup and view all the answers

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

    <p>ng-model</p> Signup and view all the answers

    How does the ng-repeat directive function in AngularJS?

    <p>It performs operations on HTML elements for each item in a collection</p> Signup and view all the answers

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

    <p>To assign initial values to variables</p> Signup and view all the answers

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

    <p>ng-fetch</p> Signup and view all the answers

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

    <p>Binds the HTML content to application data</p> Signup and view all the answers

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

    <p>ng-app</p> Signup and view all the answers

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

    <p>Displaying a collection of items dynamically in HTML</p> Signup and view all the answers

    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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    Related Documents

    UNIT 2.pdf

    Description

    Test your knowledge on AngularJS with this quiz, focusing on tables and HTML DOM manipulation. Learn how to use directives like ng-repeat to display data effectively. Challenge yourself and see how well you understand the AngularJS framework!

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