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Every 3 elements wrap a parent element
P粉211273535
P粉211273535 2024-04-02 13:11:31
0
2
265

I just want to wrap a div with the slideshow class around every 3 divs with a class for search audio.

One error I got was that it said elem.parentElement is undefined...

So this part works well...

const audioBlocks = document.querySelectorAll('.search-audio');
const slider = document.querySelector('.slider');
const audioBlockArr = Array.from(audioBlocks);

function groupBlocks(arr, len) {

    let groups = [],
        i = 0,
        n = arr.length;
  
    while (i < n) {
      groups.push(arr.slice(i, i += len));
    }
  
    return groups;
  }

newArr = [...groupBlocks(audioBlockArr, 3)];

Here's the problem - wrapping a div around a new array of grouped elements. 

let wrap = (array) => {
  
  array.forEach((elem) => {
    let div = document.createElement('div');
    div.classList.add('slide');
    div.innerHTML = '';

    elem.parentElement.insertBefore(div, elem);
    div.appendChild(elem);
  });
}

wrap(newArr);

Full code:

const audioBlocks = document.querySelectorAll('.search-audio');
const slider = document.querySelector('.slider');
const audioBlockArr = Array.from(audioBlocks);

function groupBlocks(arr, len) {

  let groups = [],
    i = 0,
    n = arr.length;

  while (i < n) {
    groups.push(arr.slice(i, i += len));
  }

  return groups;
}

newArr = [...groupBlocks(audioBlockArr, 3)];

let wrap = (array) => {
  array.forEach((elem) => {
    let div = document.createElement('div');
    div.classList.add('slide');
    div.innerHTML = '';

    elem.parentElement.insertBefore(div, elem);
    div.appendChild(elem);
  });
}

wrap(newArr);
body {
  font-family: system-ui;
  background: #f06d06;
  color: white;
  text-align: center;
}

.search-audio {
  height: 12rem;
  width: 12rem;
  background: rgb(255, 153, 0);
  margin: .5rem;
  display: inline-block;
}

.slide {
  background-color: #555;
}
<body>
  <div class="slider">
    <div class="search-audio 1"></div>
    <div class="search-audio 2"></div>
    <div class="search-audio 3"></div>
    <div class="search-audio 4"></div>
    <div class="search-audio 5"></div>
    <div class="search-audio 6"></div>
    <div class="search-audio 7"></div>
    <div class="search-audio 8"></div>
    <div class="search-audio 9"></div>
    <div class="search-audio 10"></div>
    <div class="search-audio 11"></div>
    <div class="search-audio 12"></div>
    <div class="search-audio 13"></div>
    <div class="search-audio 14"></div>
    <div class="search-audio 15"></div>
    <div class="search-audio 16"></div>
    <div class="search-audio 17"></div>
    <div class="search-audio 18"></div>
    <div class="search-audio 19"></div>
    <div class="search-audio 20"></div>
  </div>
</body>

</html>

P粉211273535
P粉211273535

reply all(2)
P粉489081732
P粉4890817322024-04-03 12:01:37 2 floor

I think you're overcomplicating things a bit, you can apply the style of .search-audio to each class of .slide by using :nth-child a third div to use CSS.

This code may be wrong, but is similar to: 

.slide:nth-child(3n) {
  /* move styles here from .search-audo */
}

Here are some links that may be helpful in learning how to use them:

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P粉012875927
P粉0128759272024-04-03 09:47:30 1 floor

The problem is that elem is not a single element, it is an array of 3 elements created by groupBlocks(). So there is no elem.parentElement.

Use elem[0].parentElement to get the common parent element of all elements. Then loop through them to append each element to a new div.

I renamed elem to group in the code below to more correctly match what it contains. 

const audioBlocks = document.querySelectorAll('.search-audio');
const slider = document.querySelector('.slider');
const audioBlockArr = Array.from(audioBlocks);

function groupBlocks(arr, len) {

  let groups = [],
    i = 0,
    n = arr.length;

  while (i  {
  array.forEach((group) => {
    let div = document.createElement('div');
    div.classList.add('slide');
    div.innerHTML = '';

    group[0].parentElement.insertBefore(div, group[0]);
    group.forEach(elem => div.appendChild(elem));
  });
}

wrap(newArr);
body {
  font-family: system-ui;
  background: #f06d06;
  color: white;
  text-align: center;
}

.search-audio {
  height: 12rem;
  width: 12rem;
  background: rgb(255, 153, 0);
  margin: .5rem;
  display: inline-block;
}

.slide {
  background-color: #555;
}
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