We learned how to work with elements in a collection and made the pop-up appear when you click on any of the buttons. Text should be displayed inside the pop-up that provides an explanation of the word that the user clicked on. The tooltip text is stored in the markup in the attribute data-tooltip-text of the button itself.
What is this attribute? HTML is a flexible language, and you can create your own attributes in it. The names of these attributes start with the data- prefix followed by any word that the developer is free to choose. This is similar to variables: you decide how to name the attribute and what value it should have.
For example:
<div data-cat-name="Muffin">
Attributes that start with data- are usually used to store supporting information. You can read more about them here.
How do you obtain the value of such an attribute in JavaScript? To do this, use the dataset property followed by the attribute name without the data- prefix:
element.dataset.attributeNameWithoutPrefix
If the attribute name consists of several words that use hyphens, then in JavaScript it is written in camelCase: the hyphens are removed, and each word is capitalized except for the first one. To get the attribute value from the example above, use the following instructions:
let element = document.querySelector('div');
console.log(element.dataset.catName); // Displays: Muffin
On our site, the tooltip texts are stored in the data-tooltip-text attributes. Let’s see how they look in the markup, and then output the value of this attribute for each button to the console.
You can create custom attributes without the data- prefix, but this code will not comply with the standard or specification. If you were to do this, then we say that the code is invalid. You can check the validity of the code using the validator.
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Check the pop-up tooltips</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-basics/element-collections-properties/queryselectorall-vs-collection">2. The querySelectorAll Method and Collections</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-basics/element-collections-properties/collection-elements-index">3. Address the elements in the collection by index</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-basics/element-collections-properties/add-handlers">4. Add handlers to both buttons</a></li><li class="main-nav__course-contents-item main-nav__course-contents-item--current"><a href="/courses/javascript-basics/element-collections-properties/data-attribute-value">5. Get the value of the data attribute</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-basics/element-collections-properties/tooltip-text-output">6. Output the tooltip text to the page</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-basics/element-collections-properties/include-script">7. Include the script in another page</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-basics/element-collections-properties/for-of-loop">8. The for of Loop</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-basics/element-collections-properties/handler-in-loop">9. Add the handler using the loop</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-basics/element-collections-properties/oninput-event-handler">10. The oninput Event Handler</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-basics/element-collections-properties/length-property">11. The Length Property, Calculating the String Length</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-basics/element-collections-properties/numbers-compare">12. Compare the numbers</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-basics/element-collections-properties/disabled-property">13. The disabled Property, Locking the Button</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-basics/element-collections-properties/add-else-branch">14. Add the branch else</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-basics/element-collections-properties/counter-reset">15. Reset the character counter to zero</a></li><li class="main-nav__course-contents-item"><a href="/courses/javascript-basics/element-collections-properties/summary">16. 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3.896.106.328.5.46.78.26.273.192.653.06.745-.26.735-2.66-1.6-5.728-3.766-7.16z" fill="#F1662A"/></svg></span><p class="course-loading-overlay__message"><b class="course-loading-overlay__message-title">Loading…</b><br><span class="course-loading-overlay__message-text">Everything will be ready in few seconds</span></p></div></div><div class="course-layout__sidebar course-theory"><div class="course-theory__inner course-theory__inner--left-stub"><button class="course-theory__close icon-close icon-close--light" type="button">Close</button><ul class="course-tabs course-tabs--non-interactive course-layout__theory-heading js--theory-tabs"><li class="course-tabs__item course-tabs__item--external course-tab course-tab--centered"><span class="course-tab__icon"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-theory"></use></svg></span><span class="course-tab__title">Theory</span></li><li class="course-tabs__item course-tabs__item--internal course-tab course-tab--centered course-tab--active js--theory-tab__theory"><span class="course-tab__icon"><svg aria-hidden="true"><use xlink:href="/img/sprites/courses.svg#icon-theory"></use></svg></span><span class="course-tab__title">Theory</span></li><li class="course-tabs__item course-tabs__item--internal course-tab course-tab--centered js--theory-tab__comments"><span class="course-tab__icon"><svg aria-hidden="true" style="width: 16px; height: 16px; fill: #2e2c9c;"><use xlink:href="/img/sprites/up.svg#comment"></use></svg></span><span class="course-tab__title">Comments</span></li></ul><section class="course-theory__content"><div class="js--theory-pane__theory course-theory__content-inner"><h1 class="course-theory__content-heading">Get the value of the data attribute</h1><div class="course-theory__content-text"><p>We learned how to work with elements in a collection and made the pop-up appear when you click on any of the buttons. Text should be displayed inside the pop-up that provides an explanation of the word that the user clicked on. The tooltip text is stored in the markup in the attribute <code class="nowrap">data-tooltip-text</code> of the button itself.</p><p>What is this attribute? HTML is a flexible language, and you can create your own attributes in it. The names of these attributes start with the <code class="nowrap">data-</code> prefix followed by any word that the developer is free to choose. This is similar to variables: you decide how to name the attribute and what value it should have.</p><p>For example:</p><pre><code><div <mark>data-cat-name</mark>="Muffin"></code></pre><p>Attributes that start with <code class="nowrap">data-</code> are usually used to store supporting information. You can read more about them <a href="https://www.w3.org/TR/html52/dom.html#embedding-custom-non-visible-data-with-the-data-attributes" target="_blank" rel="nofollow noopener">here</a>.</p><p>How do you obtain the value of such an attribute in JavaScript? To do this, use the <code>dataset</code> property followed by the attribute name without the <code class="nowrap">data-</code> prefix:</p><pre><code>element.<mark>dataset</mark>.attributeNameWithoutPrefix</code></pre><p>If the attribute name consists of several words that use hyphens, then in JavaScript it is written in <i>camelCase</i>: the hyphens are removed, and each word is capitalized except for the first one. To get the attribute value from the example above, use the following instructions:</p><pre><code>let element = document.querySelector('div');
console.log(<mark>element.dataset.catName</mark>); // Displays: Muffin</code></pre><p>On our site, the tooltip texts are stored in the <code class="nowrap">data-tooltip-text</code> attributes. Let’s see how they look in the markup, and then output the value of this attribute for each button to the console.</p><div class="info info--frame-heading info--frame-heading--boremode info--dark-gray"><p>You can create custom attributes without the <code class="nowrap">data-</code> prefix, but this code will not comply with the standard or specification. If you were to do this, then we say that the code is invalid. You can check the validity of the code using <a href="https://validator.w3.org/nu/" target="_blank" rel="nofollow noopener">the validator</a>.</p></div></div></div><div class="js--theory-pane__comments hidden course-theory__content-inner"><div class="course-theory__content-text"><h2 class="course-theory__content-heading">Comments</h2><div id="disqus_thread"></div><script>
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data-title="drones.html"
data-mode="html"
data-src="drones.html"
data-selection="[34,83,34,123]"
data-scroll-to="{"line":34,"center":true}"
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<h1 class="inner-heading">Dronovirus</h1>
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<img src="img/drone.jpg" alt="A small drone">
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<button class="heart" type="button"><span class="likes-number">50</span></button>
<time datetime="2019-12-22">December 22, 2019</time>
</div>
<p>The designers from the <button class="tooltip-button" type="button" data-tooltip-text="That's not a laboratory that inspires confidence">DogDrones.inc</button> laboratory have assured the public that their drones cannot be carriers of dangerous viruses, since their programming did not include this ability. <button class="tooltip-button" type="button" data-tooltip-text="This is not quite accurate – Legal disclaimer">Frankly speaking</button>. In fact, the laboratory's drones cannot communicate any diseases at all.</p>
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<section class="comment-feed container">
<h2>Comments</h2>
<ol class="comment-list">
<li class="user-comment">But what can you tell us about the Muffinfleet drones? This is not advertising.</li>
<li class="user-comment">I myself am a drone. Believe me, not everything is so clear.</li>
</ol>
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data-visible="false"
data-active="false"
data-enabled="false"
data-title="style.css"
data-mode="css"
data-src="style.css"
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data-scroll-to=""
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data-right-url-part=""
data-right-url-part-active="false"
data-browser-tab="false"
data-browser-tab-name=""
data-browser-tab-active="false"
data-browser-scroll="">
/* Button text styles */
.tooltip-button {
cursor: pointer;
position: relative;
padding: 1px 8px;
border: none;
color: inherit;
font: inherit;
}
.tooltip-button::after {
position: absolute;
content: "";
top: 0;
right: 0;
width: 0;
height: 0;
border: 4px solid;
border-left-color: transparent;
border-bottom-color: transparent;
}
/* Tooltip styles */
@keyframes tooltip-opener {
0% {
transform: translate(50%) scaleX(0);
}
100% {
transform: translate(100%) scaleX(100%);
}
}
.tooltip {
z-index: 2;
display: none;
flex-direction: row-reverse;
position: fixed;
max-width: 256px;
right: 0;
top: 160px;
border-radius: 8px 0 0 8px;
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.opened {
display: flex;
animation: tooltip-opener 150ms;
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.tooltip-text {
display: flex;
align-items: center;
padding: 10px;
}
.close-button {
min-height: 64px;
display: flex;
justify-content: center;
align-items: center;
width: 30px;
margin: 0;
padding: 0;
border-radius: 8px 0 0 8px;
}
.close-button span {
display: inline-block;
vertical-align: middle;
transform: rotate(-90deg);
}
/* Comment entry block styles */
.comment-area {
height: unset;
resize: none;
margin-bottom: 10px;
padding-top: 4px;
padding-bottom: 4px;
line-height: 24px;
}
.text-counter {
display: inline-block;
vertical-align: baseline;
padding: 7px 0;
margin-right: auto;
}
.comment-form.warning .comment-label {
color: #f05b29;
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.comment-form.warning .comment-area {
color: #f05b29;
border-color: #f05b29;
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.comment-form.warning .comment-area:focus {
outline-color: #f05b29;
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.comment-form.warning .char-counter {
color: #f05b29;
font-weight: bold;
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.submit-button:disabled {
opacity: 0.25;
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/* Color schemes */
.light-theme .tooltip {
background-color: #ffffff;
box-shadow: 0 0 16px rgba(0, 0, 0, 0.5);
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.light-theme .tooltip-button {
background-color: #f2f2f2;
}
.light-theme .tooltip-button:focus,
.light-theme .tooltip-button:hover {
background-color: #6653d9;
color: #ffffff;
outline-color: #b6aaff;
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.tooltip-button:active {
opacity: 0.6;
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.light-theme .tooltip-button::after {
border-right-color: #6653d9;
border-top-color: #6653d9;
}
.dark-theme .tooltip {
background-color: #2a2930;
box-shadow: 0 0 16px rgba(0, 0, 0, 1);
}
.dark-theme .tooltip-button {
background-color: #0a0910;
}
.dark-theme .tooltip-button:focus,
.dark-theme .tooltip-button:hover {
outline-color: #6653d9;
background-color: #b6aaff;
color: #17161a;
}
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border-right-color: #b6aaff;
border-top-color: #b6aaff;
}
</div><div
class="js--file"
data-visible="true"
data-active="false"
data-enabled="true"
data-title="tooltip.js"
data-mode="js"
data-src="tooltip.js"
data-selection="[19,0,19,50]"
data-scroll-to=""
data-left-url-part=""
data-right-url-part=""
data-right-url-part-active="false"
data-browser-tab="false"
data-browser-tab-name=""
data-browser-tab-active="false"
data-browser-scroll="">let tooltip = document.querySelector('.tooltip');
let closeButton = document.querySelector('.close-button');
let tooltipButtons = document.querySelectorAll('.tooltip-button');
console.log(tooltipButtons[0]);
console.log(tooltipButtons[1]);
tooltipButtons[0].onclick = function () {
tooltip.classList.add('opened');
};
tooltipButtons[1].onclick = function () {
tooltip.classList.add('opened');
};
closeButton.onclick = function () {
tooltip.classList.remove('opened');
};
// Add output to the console here
</div><div
class="js--file"
data-visible="false"
data-active="false"
data-enabled="false"
data-title="comments.js"
data-mode="js"
data-src="comments.js"
data-selection=""
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data-right-url-part=""
data-right-url-part-active="false"
data-browser-tab="false"
data-browser-tab-name=""
data-browser-tab-active="false"
data-browser-scroll="">let commentForm = document.querySelector('.comment-form');
let commentList = document.querySelector('.comment-list');
let commentField = document.querySelector('.comment-field');
commentForm.onsubmit = function (evt) {
evt.preventDefault();
let newComment = document.createElement('li');
newComment.classList.add('user-comment');
newComment.textContent = commentField.value;
commentField.value = '';
commentList.append(newComment);
};
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class="js--file"
data-visible="false"
data-active="false"
data-enabled="false"
data-title="themes.js"
data-mode="js"
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data-browser-tab="false"
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let themeButton = document.querySelector('.theme-button');
themeButton.onclick = function () {
page.classList.toggle('light-theme');
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class="js--file"
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