XMLHttpRequest vs Fetch Quiz
12 Questions
1 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the purpose of the xhr.send() method?

  • To listen to xhr events for response
  • To configure the request
  • To download the response
  • To open the connection and send the request to the server (correct)

    • Which event is triggered periodically while the response is being downloaded and reports how much has been downloaded?

  • complete
  • error
  • progress (correct)
  • load

    • What does the xhr.onerror event trigger?

  • When the response is being downloaded
  • When the request couldn't be made (correct)
  • When the response is fully downloaded
  • When the request is complete

    • Which method is used to specify the main parameters of an XMLHttpRequest request?

    <p>xhr.open()</p> Signup and view all the answers

    What is the difference between synchronous and asynchronous modes of operation in XMLHttpRequest?

    <p>Synchronous mode blocks the execution of the JavaScript code until the response is received, while asynchronous mode allows the code to continue executing while waiting for the response.</p> Signup and view all the answers

    When should XMLHttpRequest be used instead of fetch?

    <p>When we need to support old browsers and don't want to use polyfills.</p> Signup and view all the answers

    Which method is used to configure the XMLHttpRequest request, but does not open the connection?

    <p>xhr.open()</p> Signup and view all the answers

    What does the optional 'body' parameter of the xhr.send() method contain?

    <p>The request body</p> Signup and view all the answers

    Which event is triggered when the request is complete, even if the HTTP status is like 400 or 500?

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

    What is the primary reason to use XMLHttpRequest in modern web development?

    <p>To support old browsers without using polyfills</p> Signup and view all the answers

    What is the difference between synchronous and asynchronous modes of operation in XMLHttpRequest?

    <p>Synchronous mode waits for the response before continuing, while asynchronous mode does not</p> Signup and view all the answers

    What are the two primary steps to do a request using XMLHttpRequest?

    <p>Create XMLHttpRequest and initialize it</p> Signup and view all the answers

    Study Notes

    XMLHttpRequest Methods and Events

    • The xhr.send() method is used to send the request to the server.
    • The xhr.onprogress event is triggered periodically while the response is being downloaded, reporting how much has been downloaded.

    Error Handling

    • The xhr.onerror event is triggered when an error occurs during the request.

    Request Configuration

    • The xhr.open() method is used to specify the main parameters of an XMLHttpRequest request, such as the method, URL, and asynchronous mode.
    • The xhr.open() method is used to configure the XMLHttpRequest request, but does not open the connection.

    Request Body

    • The optional body parameter of the xhr.send() method contains the data to be sent with the request.

    Request Completion

    • The xhr.onload event is triggered when the request is complete, even if the HTTP status is like 400 or 500.

    XMLHttpRequest Usage

    • XMLHttpRequest should be used instead of fetch when you need more control over the request, such as setting headers, sending binary data, or tracking progress.
    • The primary reason to use XMLHttpRequest in modern web development is to have more control over the request and response.
    • The two primary steps to do a request using XMLHttpRequest are:
      • Calling the xhr.open() method to configure the request.
      • Calling the xhr.send() method to send the request.

    Synchronous and Asynchronous Modes

    • In synchronous mode, the script execution is blocked until the request is complete, while in asynchronous mode, the script execution continues, and the request is handled in the background.
    • The main difference between synchronous and asynchronous modes of operation in XMLHttpRequest is that synchronous mode blocks the script execution, while asynchronous mode does not.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    Test your knowledge on XMLHttpRequest, an important browser object that enables HTTP requests and data manipulation in JavaScript. Learn about its functionalities and how it compares to the newer fetch method in modern web development.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser