How to write accordion tabs in React?

7

75db772019-07-16 18:24:03

JavaScript

75db77, 2019-07-16 18:24:03

How to write such Accordion tabs in React?

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
.accordion {
  background-color: #eee;
  color: #444;
  cursor: pointer;
  padding: 18px;
  width: 100%;
  border: none;
  text-align: left;
  outline: none;
  font-size: 15px;
  transition: 0.4s;
}

.active, .accordion:hover {
  background-color: #ccc; 
}

.panel {
  padding: 0 18px;
  display: none;
  background-color: white;
  overflow: hidden;
}
</style>
</head>
<body>

<h2>Accordion</h2>

<button class="accordion">Section 1</button>
<div class="panel">
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
</div>

<button class="accordion">Section 2</button>
<div class="panel">
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
</div>

<button class="accordion">Section 3</button>
<div class="panel">
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
</div>

<script>
var acc = document.getElementsByClassName("accordion");
var i;

for (i = 0; i < acc.length; i++) {
  acc[i].addEventListener("click", function() {
    this.classList.toggle("active");
    var panel = this.nextElementSibling;
    if (panel.style.display === "block") {
      panel.style.display = "none";
    } else {
      panel.style.display = "block";
    }
  });
}
</script>

</body>
</html>

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1 answer(s)

A

Anton Spirin, 2019-07-16
@75db77

Your code with a couple of fixes:

const TabContent = ({ content }) => (
  <div className="accordion">
    <p>{content}</p>
  </div>
);

function Tabs({ items }) {
  /* (1) Добавлено значение по-умолчанию для активной вкладки */
  const [active, setActive] = React.useState(0);
  
  /* (2) Хандлер по-хорошему не должен ничего возвращать */
  const openTab = e => {
    setActive(+e.target.dataset.index);
  };

  return (
    <div>
      <div className="tab">
        {items.map((n, i) => (
          <button
            /* (3) Добавлено свойство key */
            key={i}
            className={`tablinks${i === active ? ' active' : ''}`}
            onClick={openTab}
            data-index={i}
          >
            {n.title}
          </button>
        ))}
      </div>
      {items[active] && <TabContent {...items[active]} />}
    </div>
  );
}

/* (4) Добавлено свойство title для каждого пункта */
/* (5) Добавлены открывающие кавычки для значений content */
const items = [
  {
    title: 'First',
    content:
      '1. Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.'
  },
  {
    title: 'Second',
    content:
      '2. Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.'
  },
  {
    title: 'Third',
    content:
      '3. Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.'
  }
];

ReactDOM.render(<Tabs items={items} />, document.getElementById('app'));