HTML Academy
We retrieve data from the input field using input.value
Introduction to JavaScript16/17
Back to the list of tasks
  • 1. Why is JavaScript necessary?
  • 2. Introduction to the theme switcher
  • 3. Find an element using querySelector
  • 4. Output the element to the console.
  • 5. Let’s remove the class using classList.remove
  • 6. Let’s add a class to the element using classList.add
  • 7. Declare a variable
  • 8. Introduction to the event handler
  • 9. Let’s make it so that the theme is switched when the button is clicked
  • 10. Introduction to classList.toggle
  • 11. Let’s finish our theme switcher
  • 12. Introduction to the textContent property
  • 13. Change the textual content for the element
  • 14. Uncomment the code
  • 15. We retrieve data from the input field using input.value
  • 16. Let’s use concatenation
  • 17. Summary of “Introduction to JavaScript”
Summary of “Introduction to JavaScript”
  • Sign up
  • Log in

Loading…
Everything will be ready in few seconds

  • Theory
  • Theory
  • Comments

Let’s use concatenation

We have already learned how to display lines of text and data obtained from the input field on the page. But the message confirming that the user has successfully subscribed is more complicated: it must contain both the address that was entered by the user and text. How can we accomplish that?

We need to concatenate several values. An operation that allows you to join one piece of text to another is called concatenation, and in JavaScript we can do this using the plus sign.

You can combine together ordinary lines in this way:

paragraph.textContent = 'Your name is ' + 'instructor Muffin';
console.log(paragraph.textContent);
// Displays: Your name is instructor Muffin

And you can also concatenate strings and variables (or the properties of elements). And, by the way, you can have more than two values:

let name = 'Muffin';
paragraph.textContent = 'Your name is ' + name + '. Good day!';
console.log(paragraph.textContent);
// Displays: Your name is Muffin. Good day!

The message confirming that the user has successfully subscribed consists of two lines and the property email.value:

'The ' + email.value + ' address was added to our list of newsletter recipients.'

Tell JavaScript to display it after form submission – and the subscription page will be done! Muffin, get cracking!

Comments

  • index.html
  • style.css
  • script.js
HTML
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <link rel="stylesheet" href="setting.css"> <link rel="stylesheet" href="style.css"> <title>FlashNews!</title> </head> <body class="page light-theme"> <header class="page-header"> <div class="container"> <a class="header-link" href="#">Main page</a> <button class="theme-button" type="button">Change the theme</button> </div> </header> <main class="inner-main"> <div class="container"> <h1 class="inner-heading">Subscribe to our newsletter</h1> <p class="subscription-message">We promise to send you news no more than once a day. We will only send you the most interesting and important stories.</p> <form action="https://echo.htmlacademy.ru/courses" method="post" class="subscription"> <div class="subscription-inner"> <label class="subscription-label" for="subscription-email">email</label> <input type="email" class="subscription-email" placeholder="muffin@flashnews.ru" value="" required id="subscription-email"> </div> <button class="button subscription-button" type="submit">Subscribe</button> </form> <section class="news-list list-tiles-view"> <h2 class="news-list-heading">Or continue reading more news stories.</h2> <article class="new-block"> <img src="img/new-graph.jpg" alt="New library"> <div class="new-block-text"> <h3>New graphics library</h3> <p>Now you can create a dashboard in just a matter of seconds.</p> <time datetime="2019-10-16">October 16, 2019</time> </div> </article> <article class="new-block"> <img src="img/new-robot.jpg" alt="What is going on with robots?"> <div class="new-block-text"> <h3>What is going on with robots?</h3> <p>A lot of interesting things are happening in robotics. This could be a piece of news about the latest developments, but that is not what this is.</p> <time datetime="2019-10-15">October 15, 2019</time> </div> </article> </section> </div> </main> <footer class="page-footer"> <div class="container"> <p>© FlashNews!</p> <a class="footer-logo"> <img src="img/white-logo.svg" alt="FlashNews! portal logo"> </a> </div> </footer> <script src="script.js"></script> </body> </html>
CSS
/* Light theme */ .light-theme { color: #333333; background-color: #eae9f2; } .light-theme .page-header { background-color: #ffffff; box-shadow: 0 2px 2px rgba(0, 0, 0, 0.2); } .light-theme .header-link { color: #6653d9; } .light-theme .header-link::before { background: url("img/arrow-back-light.svg") no-repeat 0 0; } .light-theme .theme-button { color: #6653d9; border: 1px solid #6653d9; } .light-theme .theme-button::before { background-image: url("img/moon-normal.svg"); } .light-theme .theme-button:focus, .light-theme .theme-button:hover { color: #ffffff; background-color: #6653d9; } .light-theme .theme-button:focus::before, .light-theme .theme-button:hover::before { background-image: url("img/moon-hover.svg"); } .light-theme .menu-open { background-color: #ffffff; background-image: url("img/menu-open-light.svg"); } .light-theme .menu-open:focus, .light-theme .menu-open:hover { background-color: #6653d9; background-image: url("img/menu-open-dark.svg"); } .light-theme .menu-close { background-color: #6653d9; } .light-theme .menu-close:focus, .light-theme .menu-close:hover { background-color: #473c8d; } .light-theme .main-menu { background-color: #6653d9; color: #ffffff; } .light-theme .main-menu a:focus, .light-theme .main-menu a:hover { background-color: #473c8d; } .light-theme .news-view button { border: 1px solid #6653d9; color: #6653d9; } .light-theme .news-view button:focus, .light-theme .news-view button:hover, .light-theme .news-view button:active, .light-theme .news-view .view-checked { background-color: #6653d9; color: #ffffff; } .light-theme .news-view .row-view:focus::before, .light-theme .news-view .row-view:hover::before, .light-theme .news-view .row-view:active::before { background-image: url("img/rows-light-checked.svg"); } .light-theme .news-view .tile-view:focus::before, .light-theme .news-view .tile-view:hover::before, .light-theme .news-view .tile-view:active::before { background-image: url("img/tiles-light-checked.svg"); } .light-theme .row-view::before { background-image: url("img/rows-light.svg"); } .light-theme .tile-view::before { background-image: url("img/tiles-light.svg"); } .light-theme .row-view::before { background-image: url("img/rows-light.svg"); } .light-theme .row-view.view-checked::before { background-image: url("img/rows-light-checked.svg"); } .light-theme .tile-view.view-checked::before { background-image: url("img/tiles-light-checked.svg"); } .light-theme .new-block { background-color: #ffffff; box-shadow: 0 1px 4px rgba(0, 0, 0, 0.2); } .light-theme .new-block time { color: #aaaaaa; } .light-theme .cookies-agreement { background-color: #fdeacd; box-shadow: 0 -1px 4px rgba(0, 0, 0, 0.2); } .light-theme .button { background-color: #6653d9; color: #ffffff; } .light-theme .button:focus, .light-theme .button:hover { background-color: #473c8d; } .light-theme .page-footer { background-color: #6653d9; color: #ffffff; } .light-theme .subscription { background-color: #ffffff; box-shadow: 0 1px 4px rgba(0, 0, 0, 0.2); } .light-theme .subscription-message { background-color: #6653d9; color: #eae9f2; } .light-theme .subscription-message::before { background-image: url("img/icon-ok-light.svg"); } .light-theme .subscription-label { color: #6653d9; } .light-theme .subscription-email { border-bottom: 1px solid #6653d9; color: #333333; } /* Dark theme */ .dark-theme { color: #f2f2f2; background-color: #17161a; } .dark-theme .page-header { background-color: #373540; box-shadow: 0 2px 2px rgba(0, 0, 0, 0.6); } .dark-theme .header-link { color: #9484f2; } .dark-theme .header-link::before { background: url("img/arrow-back-dark.svg") no-repeat 0 0; } .dark-theme .theme-button { color: #9484f2; border: 1px solid #9484f2; } .dark-theme .theme-button::before { background-image: url("img/sun-normal.svg"); } .dark-theme .theme-button:focus, .dark-theme .theme-button:hover { color: #17161a; background-color: #9484f2; } .dark-theme .theme-button:focus::before, .dark-theme .theme-button:hover::before { background-image: url("img/sun-hover.svg"); } .dark-theme .menu-open { background-color: #373540; background-image: url("img/menu-open-dark.svg"); } .dark-theme .menu-open:focus, .dark-theme .menu-open:hover { background-color: #473c8d; background-image: url("img/menu-open-dark.svg"); } .dark-theme .menu-close { background-color: #473c8d; } .dark-theme .menu-close:focus, .dark-theme .menu-close:hover { background-color: #6653d9; } .dark-theme .main-menu { background-color: #473c8d; color: #f2f2f2; } .dark-theme .main-menu a:focus, .dark-theme .main-menu a:hover { background-color: #6653d9; } .dark-theme .news-view button { border: 1px solid #9484f2; color: #9484f2; } .dark-theme .news-view button:focus, .dark-theme .news-view button:hover, .dark-theme .news-view button:active, .dark-theme .news-view .view-checked { background-color: #9484f2; color: #17161a; } .dark-theme .news-view .row-view:focus::before, .dark-theme .news-view .row-view:hover::before, .dark-theme .news-view .row-view:active::before { background-image: url("img/rows-dark-checked.svg"); } .dark-theme .news-view .tile-view:focus::before, .dark-theme .news-view .tile-view:hover::before, .dark-theme .news-view .tile-view:active::before { background-image: url("img/tiles-dark-checked.svg"); } .dark-theme .row-view::before { background-image: url("img/rows-dark.svg"); } .dark-theme .tile-view::before { background-image: url("img/tiles-dark.svg"); } .dark-theme .row-view.view-checked::before { background-image: url("img/rows-dark-checked.svg"); } .dark-theme .tile-view.view-checked::before { background-image: url("img/tiles-dark-checked.svg"); } .dark-theme .new-block { background-color: #2a2930; box-shadow: 0 1px 4px rgba(0, 0, 0, 0.6); } .dark-theme .new-block time { color: #888888; } .dark-theme .cookies-agreement { background-color: #473c8d; box-shadow: 0 -1px 4px rgba(0, 0, 0, 0.6); } .dark-theme .button { background-color: #9484f2; color: #17161a; } .dark-theme .button:focus, .dark-theme .button:hover { background-color: #b6aaff; } .dark-theme .page-footer { background-color: #0a0910; color: #f2f2f2; } .dark-theme .subscription { background-color: #2a2930; box-shadow: 0 1px 4px rgba(0, 0, 0, 0.6); } .dark-theme .subscription-message { background-color: #9484f2; color: #17161a; } .dark-theme .subscription-message::before { background-image: url("img/icon-ok-dark.svg"); } .dark-theme .subscription-label { color: #9484f2; } .dark-theme .subscription-email { border-bottom: 1px solid #9484f2; color: #f2f2f2; }
JavaScript
let page = document.querySelector('.page'); let themeButton = document.querySelector('.theme-button'); themeButton.onclick = function() { page.classList.toggle('light-theme'); page.classList.toggle('dark-theme'); }; let message = document.querySelector('.subscription-message'); let form = document.querySelector('.subscription'); let email = document.querySelector('.subscription-email'); form.onsubmit = function(evt) { evt.preventDefault(); // Change the value of textContent on the next line message.textContent = email.value; };

What didn’t you like in this task?

Thanks! We’ll fix everything at once!

Click inside the mini browser to put the focus in this window.

100%
Console
Goalscompleted
0
    1. On line 15, change the value of message.textContent to 'The ' + email.value + ' address was added to our list of newsletter recipients.'
    2. Click on the “Subscribe” button

    Cookies ∙ Privacy ∙ License Agreement ∙ About ∙ Contacts ∙ © HTML Academy OÜ, 2019−2025

    VISAMastercard

    Log in

    or

    Forgot your password?

    Sign up

    Sign up

    or
    Log in

    Restore access

    Have you forgotten your password or lost access to your profile? Enter your email connected to your profile and we will send you a link to restore access.

    Forgot to connect your email to the profile? Email us and we’ll help.