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- Teoría
- Teoría
Usar else y la rama alternativa
Bien, el contador ya no aumenta con cada clic. Pero todavía tampoco disminuye cuando se quita el Me gusta.
El problema es que la instrucción counter++; se ejecuta sin depender de la condición. Hay que hacer que counter++; se ejecute solo cuando la clase added no esté presente.
Podríamos añadir otra estructura condicional para aumentar el contador. Pero también podemos completar la estructura condicional actual con una rama alternativa. Para eso usamos else:
if (condición) {
// Instrucciones que se ejecutarán si la condición es verdadera
} else {
// Instrucciones que se ejecutarán si la condición es falsa
}Dentro de las llaves que van después de else se escriben las instrucciones que deben ejecutarse si la condición devuelve false.
Añadan else al script y muevan counter++ dentro de esa rama. Así el contador solo aumentará cuando el elemento heart todavía no tenga la clase added.
Todos los archivos
<!DOCTYPE html>
<html lang="es">
<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">
<span class="header-logo">
<img src="img/main-logo.svg" width="67" height="29" alt="Logotipo del portal FlashNews!">
</span>
<button class="theme-button" type="button">Cambiar tema</button>
</div>
</header>
<main class="inner-news">
<article class="container">
<h1 class="inner-heading">🔥 ¡Impacto! ¡Escándalo! ¡Sensación!</h1>
<div class="news-full">
<img src="img/news-robot2.jpg" alt="Robot de vacaciones">
<div class="news-stats">
<button class="heart" type="button"><span class="likes-number"></span></button>
<time datetime="2019-12-22">22 dic 2019</time>
</div>
<p>Resulta que, para empezar a programar en JavaScript, no hace falta ser un gato. Un grupo de científicos creó el primer robot capaz de desarrollarse y cambiar su propio código. Enseguida aprendió a maquetar sitios web y se fue a trabajar como freelance a Bali.</p>
</div>
</article>
</main>
<footer class="page-footer">
<div class="container">
<p>© FlashNews!</p>
<span class="footer-logo">
<img src="img/white-logo.svg" alt="Logotipo del portal FlashNews!">
</span>
</div>
</footer>
<script src="themes.js"></script>
<script src="likes.js"></script>
</body>
</html>
/* Estilos de la página de noticias */
.comment-form {
display: flex;
margin-bottom: 30px;
padding: 20px 12px;
}
.comment-inner {
position: relative;
flex-grow: 1;
margin-right: 10px;
}
.comment-label {
position: absolute;
top: -16px;
left: -9px;
padding: 4px 8px;
font-size: 10px;
line-height: 14px;
}
.comment-field {
width: 100%;
height: 30px;
padding: 0 10px;
border: none;
background-color: transparent;
font: inherit;
font-size: 14px;
line-height: 30px;
}
.comment-field::placeholder {
color: #aaaaaa;
font: inherit;
font-size: 14px;
font-style: italic;
}
.comment-field:focus::placeholder {
font-size: 0;
}
.comment-field:hover::placeholder,
.comment-field:active::placeholder {
opacity: 0.5;
}
.inner-news .inner-heading {
margin-bottom: 20px;
font-size: 24px;
}
.news-full {
display: flex;
flex-direction: column;
margin-bottom: 24px;
}
.news-full img {
margin-bottom: 4px;
width: 100%;
height: 220px;
object-fit: cover;
}
.news-full .news-stats {
display: flex;
justify-content: space-between;
}
.news-full .heart {
padding: 12px 10px;
min-width: 40px;
min-height: 34px;
font-family: inherit;
font-weight: bold;
font-size: 16px;
border: none;
background-color: transparent;
background-repeat: no-repeat;
background-position: 12px;
cursor: pointer;
}
.heart .likes-number {
margin-left: 24px;
line-height: 14px;
}
.news-full time {
margin-top: 14px;
margin-right: 12px;
margin-bottom: 8px;
margin-left: 0;
}
.news-full p {
margin-top: 0;
margin-right: 12px;
margin-bottom: 16px;
margin-left: 12px;
font-size: 14px;
line-height: 24px;
}
.comment-feed h2 {
margin-top: 0;
margin-bottom: 12px;
}
.comment-list {
margin-top: 0;
margin-right: 0;
margin-bottom: 12px;
margin-left: 0;
padding: 0;
list-style: none;
counter-reset: comments;
}
.comment-list li {
margin-bottom: 6px;
padding: 10px 12px;
min-height: 36px;
font-size: 14px;
line-height: 24px;
}
.comment-list .user-comment {
position: relative;
display: flex;
}
.comment-list .user-comment::before {
counter-increment: comments;
content: "#" counter(comments);
padding-right: 12px;
margin-right: 12px;
border-right: 1px solid;
font-weight: bold;
}
.comment-list .user-comment::after {
position: absolute;
content: "";
width: 0;
height: 0;
bottom: 0;
left: -8px;
border: 4px solid;
border-left-color: transparent;
border-top-color: transparent;
}
@keyframes comment-blink-light {
0% {
background-color: #b6aaff;
opacity: 0;
}
20% {
opacity: 0.8;
}
}
@keyframes comment-blink-light-after {
0% {
border-right-color: #b6aaff;
border-bottom-color: #b6aaff;
opacity: 0;
}
20% {
opacity: 0.8;
}
}
@keyframes comment-blink-dark {
0% {
background-color: #473c8d;
opacity: 0;
}
20% {
opacity: 1;
}
}
@keyframes comment-blink-dark-after {
0% {
border-right-color: #473c8d;
border-bottom-color: #473c8d;
opacity: 0;
}
20% {
opacity: 1;
}
}
/* Temas */
.dark-theme .header-logo {
filter: invert(1) hue-rotate(180deg) brightness(2);
}
/* Tema claro */
.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-image: url("img/arrow-back-light.svg");
background-repeat: no-repeat;
background-position: 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 {
outline-color: #b6aaff;
}
.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:focus {
outline-color: #b6aaff;
}
.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 .main-menu a:focus {
outline-color: #b6aaff;
}
.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 button:focus {
outline-color: #b6aaff;
}
.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.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 .news-full {
background-color: #ffffff;
box-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
}
.light-theme .new-block time {
color: #aaaaaa;
}
.light-theme .news-full 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 .button:focus {
outline-color: #b6aaff;
}
.light-theme .page-footer {
background-color: #6653d9;
color: #ffffff;
}
.light-theme .subscription,
.light-theme .comment-form {
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,
.light-theme .comment-label {
color: #6653d9;
}
.light-theme .subscription-email,
.light-theme .comment-field {
border: 1px solid #eae9f2;
color: #333333;
}
.light-theme .heart {
color: #6653d9;
background-image: url("img/icon-heart-light.svg");
opacity: 0.7;
}
.light-theme .heart.added {
background-image: url("img/icon-heart-light-added.svg");
}
.page .heart:focus,
.page .heart:hover {
opacity: 1;
}
.light-theme .heart:focus {
outline-color: #b6aaff;
}
.light-theme .heart:active {
opacity: 1;
background-image: url("img/icon-heart-light-active.svg");
}
.light-theme .comment-list li {
background-color: #ffffff;
}
.light-theme .user-comment:not(:first-child) {
animation: comment-blink-light 600ms ease-in;
}
.light-theme .user-comment::before {
border-right-color: #eae9f2;
color: #cdcdcd;
}
.light-theme .user-comment::after {
border-right-color: #ffffff;
border-bottom-color: #ffffff;
}
.light-theme .user-comment:not(:first-child)::after {
animation: comment-blink-light-after 600ms ease-in;
}
.light-theme .comment-label {
background-color: #ffffff;
}
.light-theme .comment-field:focus {
outline-color: #b6aaff;
}
/* Tema oscuro */
.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-image: url("img/arrow-back-dark.svg");
background-repeat: no-repeat;
background-position: 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 {
outline-color: #6653d9;
}
.dark-theme .theme-button:focus::before,
.dark-theme .theme-button:hover::before {
background-image: url("img/sun-hover.svg");
}
.dark-theme .menu:focus {
outline-color: #6653d9;
}
.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 {
outline-color: #6653d9;
}
.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 {
outline-color: #6653d9;
}
.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 .news-full {
background-color: #2a2930;
box-shadow: 0 1px 4px rgba(0, 0, 0, 0.6);
}
.dark-theme .new-block time {
color: #888888;
}
.dark-theme .news-full 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 {
outline-color: #6653d9;
}
.dark-theme .button:focus,
.dark-theme .button:hover {
background-color: #b6aaff;
}
.dark-theme .page-footer {
background-color: #0a0910;
color: #f2f2f2;
}
.dark-theme .subscription,
.dark-theme .comment-form {
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,
.dark-theme .comment-label {
color: #9484f2;
}
.dark-theme .comment-label {
background-color: #2a2930;
}
.dark-theme .subscription-email,
.dark-theme .comment-field {
border: 1px solid #473c8d;
color: #f2f2f2;
}
.dark-theme .heart {
color: #9484f2;
background-image: url("img/icon-heart-dark.svg");
opacity: 0.7;
}
.dark-theme .heart:focus {
outline-color: #6653d9;
}
.dark-theme .heart.added {
background-image: url("img/icon-heart-dark-added.svg");
}
.dark-theme .heart:active {
opacity: 1;
background-image: url("img/icon-heart-dark-active.svg");
}
.dark-theme .comment-list li {
background-color: #2a2930;
}
.dark-theme .user-comment:not(:first-child) {
animation: comment-blink-dark 600ms ease-in;
}
.dark-theme .user-comment::before {
border-right-color: #17161a;
color: rgba(255, 255, 255, 0.3);
}
.dark-theme .user-comment::after {
border-right-color: #2a2930;
border-bottom-color: #2a2930;
}
.dark-theme .user-comment:not(:first-child)::after {
animation: comment-blink-dark-after 600ms ease-in;
}
.dark-theme .comment-field:focus {
outline-color: #6653d9;
}
let heart = document.querySelector('.heart');
let likesNumber = document.querySelector('.likes-number');
let counter = 0;
heart.onclick = function () {
if (heart.classList.contains('added')) {
counter--;
} // Agreguen else aquí
counter++;
likesNumber.textContent = counter;
heart.classList.toggle('added');
};
let page = document.querySelector('.page');
let themeButton = document.querySelector('.theme-button');
themeButton.onclick = function () {
page.classList.toggle('light-theme');
page.classList.toggle('dark-theme');
};
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