HTML: <!DOCTYPE html> <html lang=\"en\"> <head> <meta charset=\"UTF-8\"> <title>
ID: 3588275 • Letter: H
Question
HTML:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>FAQs</title>
<link rel="stylesheet" href="main.css">
<script src="faqs.js"></script>
</head>
<body>
<main id="faqs">
<h1>JavaScript FAQs</h1>
<h2><a href="#" >What is JavaScript?</a></h2>
<div>
<p>JavaScript is a is a browser-based programming language
that makes web pages more responsive and saves round trips to the server.
</p>
</div>
<h2><a href="#">What is jQuery?</a></h2>
<div>
<p>jQuery is a library of the JavaScript functions that you're most likely
to need as you develop websites.
</p>
</div>
<h2><a href="#">Why is jQuery becoming so popular?</a></h2>
<div>
<p>Three reasons:</p>
<ul>
<li>It's free.</li>
<li>It lets you get more done in less time.</li>
<li>All of its functions are cross-browser compatible.</li>
</ul>
</div>
</main>
</body>
</html>
JS:
"use strict";
var $ = function(id) { return document.getElementById(id); };
// the event handler for the click event of each h2 element
var toggle = function() {
var h2 = this; // clicked h2 tag
var div = h2.nextElementSibling; // h2 tag's sibling div tag
// toggle plus and minus image in h2 elements by adding or removing a class
if (h2.hasAttribute("class")) {
h2.removeAttribute("class");
} else {
h2.setAttribute("class", "minus");
}
// toggle div visibility by adding or removing a class
if (div.hasAttribute("class")) {
div.removeAttribute("class");
} else {
div.setAttribute("class", "open");
}
};
window.onload = function() {
// get the h2 tags
var faqs = $("faqs");
var h2Elements = faqs.getElementsByTagName("h2");
// attach event handler for each h2 tag
for (var i = 0; i < h2Elements.length; i++ ) {
h2Elements[i].onclick = toggle;
}
// set focus on first h2 tag's <a> tag
h2Elements[0].firstChild.focus();
};
CSS:
* {
margin: 0;
padding: 0;
}
body {
font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 87.5%;
width: 650px;
margin: 0 auto;
border: 3px solid blue;
padding: 15px 25px;
}
h1 {
font-size: 150%;
}
h2 {
font-size: 120%;
padding: .25em 0 .25em 25px;
cursor: pointer;
background: url(images/plus.png) no-repeat left center;
}
h2.minus {
background: url(images/minus.png) no-repeat left center;
}
a {
color: black;
text-decoration: none;
}
a:focus, a:hover {
color: blue;
}
div {
display: none;
}
div.open {
display: block;
}
ul {
padding-left: 45px;
}
li {
padding-bottom: .25em;
}
p {
padding-bottom: .25em;
padding-left: 25px;
}
Images:
Extra 6-3Modify the FAQs application This exercise has you make a minor modification to the FAQs application. When you're done, this application should work the same as before, except that only one answer can be displayed at a time. In other words, when the user clicks on a heading to display the answer, the other answers must be hidden JavaScript FAQs What is JavaScript? What is jQuery? jQuery is a library of the JavaScript functions that you're most likely to need as you develop web sites. Why is jQuery becoming so popular? 1. Open the HTML and JavaScript files in this folder exercises_extralch061faqs Then, run the application to refresh your memory about how it works. Add code to the toggle() function so only one answer can be displayed at a time. To do that, create an array of the h2 elements. Then, use a for loop to go through the h2 elements in the array and remove the class attribute for all h2 elements that aren't the one that has been clicked. You also need to remove the class attributes for all of the div siblings of the h2 elements that weren't clicked 2.Explanation / Answer
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>FAQs</title>
<link rel="stylesheet" href="main.css">
<script src="faqs.js"></script>
</head>
<body>
<main id="faqs">
<h1>JavaScript FAQs</h1>
<h2><a href="#" >What is JavaScript?</a></h2>
<div>
<p>JavaScript is a is a browser-based programming language
that makes web pages more responsive and saves round trips to the server.
</p>
</div>
<h2><a href="#">What is jQuery?</a></h2>
<div>
<p>jQuery is a library of the JavaScript functions that you're most likely
to need as you develop websites.
</p>
</div>
<h2><a href="#">Why is jQuery becoming so popular?</a></h2>
<div>
<p>Three reasons:</p>
<ul>
<li>It's free.</li>
<li>It lets you get more done in less time.</li>
<li>All of its functions are cross-browser compatible.</li>
</ul>
</div>
</main>
</body>
</html>
JS:
"use strict";
var $ = function(id) { return document.getElementById(id); };
// the event handler for the click event of each h2 element
var toggle = function() {
var h2 = this; // clicked h2 tag
var div = h2.nextElementSibling; // h2 tag's sibling div tag
// toggle plus and minus image in h2 elements by adding or removing a class
if (h2.hasAttribute("class")) {
h2.removeAttribute("class");
} else {
h2.setAttribute("class", "minus");
}
// toggle div visibility by adding or removing a class
if (div.hasAttribute("class")) {
div.removeAttribute("class");
} else {
div.setAttribute("class", "open");
}
};
window.onload = function() {
// get the h2 tags
var faqs = $("faqs");
var h2Elements = faqs.getElementsByTagName("h2");
// attach event handler for each h2 tag
for (var i = 0; i < h2Elements.length; i++ ) {
h2Elements[i].onclick = toggle;
}
// set focus on first h2 tag's <a> tag
h2Elements[0].firstChild.focus();
};
CSS:
* {
margin: 0;
padding: 0;
}
body {
font-family: Verdana, Arial, Helvetica, sans-serif;
font-size: 87.5%;
width: 650px;
margin: 0 auto;
border: 3px solid blue;
padding: 15px 25px;
}
h1 {
font-size: 150%;
}
h2 {
font-size: 120%;
padding: .25em 0 .25em 25px;
cursor: pointer;
background: url(images/plus.png) no-repeat left center;
}
h2.minus {
background: url(images/minus.png) no-repeat left center;
}
a {
color: black;
text-decoration: none;
}
a:focus, a:hover {
color: blue;
}
div {
display: none;
}
div.open {
display: block;
}
ul {
padding-left: 45px;
}
li {
padding-bottom: .25em;
}
p {
padding-bottom: .25em;
padding-left: 25px;
}
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