CSS Fundamentals for Visually Appealing Web

Introduction

In this lab, we will explore the fundamentals of CSS (Cascading Style Sheets) programming. This lab will cover the basics of CSS syntax, selectors, properties, and values. By the end of this lab, you will have a solid foundation in CSS programming and be able to create visually appealing web pages.

Alternating Text

index.html and style.css have already been provided in the VM.

To create an alternating text animation, follow these steps:

1. Create a <span> element with a class of "alternating" and an id of "alternating-text" to hold the text that will be alternated:

<p>I love coding in <span class="alternating" id="alternating-text"></span>.</p>

2. In the CSS, define an animation called alternating-text that will make the <span> element disappear by setting display: none:

.alternating {
  animation-name: alternating-text;
  animation-duration: 3s;
  animation-iteration-count: infinite;
  animation-timing-function: ease;
}

@keyframes alternating-text {
  90% {
    display: none;
  }
}

3. In JavaScript, define an array of the different words that will be alternated and use the first word to initialize the content of the <span> element:

const texts = ["Java", "Python", "C", "C++", "C#", "Javascript"];
const element = document.getElementById("alternating-text");

let i = 0;
element.innerHTML = texts[0];

4. Use EventTarget.addEventListener() to define an event listener for the 'animationiteration' event. This will run the event handler whenever an iteration of the animation is completed. In the event handler, use Element.innerHTML to display the next element in the texts array as the content of the <span> element:

const listener = (e) => {
  i = i < texts.length - 1 ? i + 1 : 0;
  element.innerHTML = texts[i];
};

element.addEventListener("animationiteration", listener, false);

Please click on 'Go Live' in the bottom right corner to run the web service on port 8080. Then, you can refresh the Web 8080 Tab to preview the web page.

Summary

Congratulations! You have completed the Alternating Text lab. You can practice more labs in LabEx to improve your skills.