javascript - 根据ids选择多个元素，得到相邻的最大组

Question

这听起来可能令人困惑 - 我自己写的时候也很困惑哈。所以基本上我有一些 svg 路径，它们都有像 20_11_3 这样的 ID，它是 blockID_rowId_seatId。

<svg>
  <path class="seat" data-id="20_11_1"></path>
  <path class="seat" data-id="20_11_2"></path>
  <path class="seat is-available" data-id="20_11_3"></path>
  <path class="seat is-available" data-id="20_11_4"></path>
  <path class="seat" data-id="20_11_5"></path>
  <path class="seat" data-id="20_11_6"></path>
  <path class="seat is-available" data-id="20_11_7"></path>

  <path class="seat" data-id="20_12_1"></path>
  <path class="seat" data-id="20_12_2"></path>
  <path class="seat" data-id="20_12_3"></path>
  <path class="seat" data-id="20_12_4"></path>
  <path class="seat is-available" data-id="20_12_5"></path>
  <path class="seat" data-id="20_12_6"></path>
  <path class="seat" data-id="20_12_7"></path>

  <path class="seat" data-id="21_1_1"></path>
  <path class="seat" data-id="21_1_2"></path>
  <path class="seat is-available" data-id="21_1_3"></path>
  <path class="seat is-available" data-id="21_1_4"></path>
  <path class="seat is-available" data-id="21_1_5"></path>
  <path class="seat" data-id="21_1_6"></path>
  <path class="seat" data-id="21_1_7"></path>
</svg>

我需要捕获相邻座位最多的一组座位。因此，选择上方的这种情况将是 block 21 第 1 行中三个可用席位的节点列表。

我想我将不得不首先使用 querySelector all 选择所有 seat.is-available 座位，然后过滤它们以获得最多 4 个座位的最佳组。真的很难弄清楚如何在不过度设计它的情况下解决它。

希望这一切都有意义。

Answer 1

使用 jQuery 你可以做这样的事情。

// get first avalable seat
let $ele = $('.seat.is-available:eq(0)');
//  variable for holding largest range collection
let $maxRange;

// iterate until get empty
while ($ele.length) {
  // extract the id prefix
  let prefix = $ele.data('id').substr(0, $ele.data('id').lastIndexOf('_') + 1);

  // set current range as current element
  let $currentRange = $ele;
  // keep a temporary copy for  iterating
  let $tmp = $currentRange;
  // iterate until there is no adjacent availabe seat is there
  while (($tmp = $tmp.next(`[data-id^="${prefix}"].is-available`)).length)
    // add seat eleemnt to current range
    $currentRange = $currentRange.add($tmp);
  // check previous range and current range and update maxrange acconrdingly
  $maxRange = !$maxRange || $currentRange.length > $maxRange.length ? $currentRange : $maxRange;
  // get next available seat
  $ele = $currentRange.last().nextAll('.seat.is-available').first();
}


console.log($maxRange.map(function() { // extract seat ids
  return $(this).data('id');
}).get())

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<svg>
  <path class="seat" data-id="20_11_1"></path>
  <path class="seat" data-id="20_11_2"></path>
  <path class="seat is-available" data-id="20_11_3"></path>
  <path class="seat is-available" data-id="20_11_4"></path>
  <path class="seat" data-id="20_11_5"></path>
  <path class="seat" data-id="20_11_6"></path>
  <path class="seat is-available" data-id="20_11_7"></path>

  <path class="seat" data-id="20_12_1"></path>
  <path class="seat" data-id="20_12_2"></path>
  <path class="seat" data-id="20_12_3"></path>
  <path class="seat" data-id="20_12_4"></path>
  <path class="seat is-available" data-id="20_12_5"></path>
  <path class="seat" data-id="20_12_6"></path>
  <path class="seat" data-id="20_12_7"></path>

  <path class="seat" data-id="21_1_1"></path>
  <path class="seat" data-id="21_1_2"></path>
  <path class="seat is-available" data-id="21_1_3"></path>
  <path class="seat is-available" data-id="21_1_4"></path>
  <path class="seat is-available" data-id="21_1_5"></path>
  <path class="seat" data-id="21_1_6"></path>
  <path class="seat" data-id="21_1_7"></path>
</svg>

更新:按照您的要求，与 id 属性相同。

// get first avalable seat
let $ele = $('.seat.is-available:eq(0)');
//  variable for holding largest range collection
let $maxRange;

// iterate until get empty
while ($ele.length) {
  // extract the id prefix
  let prefix = $ele.attr('id').substr(0, $ele.attr('id').lastIndexOf('_') + 1);

  // set current range as current element
  let $currentRange = $ele;
  // keep a temporary copy for  iterating
  let $tmp = $currentRange;
  // iterate until there is no adjacent availabe seat is there
  while (($tmp = $tmp.next(`[id^="${prefix}"].is-available`)).length){
    // add seat eleemnt to current range
    $currentRange = $currentRange.add($tmp);
    }
  // check previous range and current range and update maxrange acconrdingly
  $maxRange = !$maxRange || $currentRange.length > $maxRange.length ? $currentRange : $maxRange;
  // get next available seat
  $ele = $currentRange.last().nextAll('.seat.is-available').first();
}


console.log($maxRange.map(function() { // extract seat ids
  return $(this).attr('id');
}).get())

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<svg>
  <path class="seat" id="20_11_1"></path>
  <path class="seat" id="20_11_2"></path>
  <path class="seat is-available" id="20_11_3"></path>
  <path class="seat is-available" id="20_11_4"></path>
  <path class="seat" id="20_11_5"></path>
  <path class="seat" id="20_11_6"></path>
  <path class="seat is-available" id="20_11_7"></path>

  <path class="seat" id="20_12_1"></path>
  <path class="seat" id="20_12_2"></path>
  <path class="seat" id="20_12_3"></path>
  <path class="seat" id="20_12_4"></path>
  <path class="seat is-available" id="20_12_5"></path>
  <path class="seat" id="20_12_6"></path>
  <path class="seat" id="20_12_7"></path>

  <path class="seat" id="21_1_1"></path>
  <path class="seat" id="21_1_2"></path>
  <path class="seat is-available" id="21_1_3"></path>
  <path class="seat is-available" id="21_1_4"></path>
  <path class="seat is-available" id="21_1_5"></path>
  <path class="seat" id="21_1_6"></path>
  <path class="seat" id="21_1_7"></path>
</svg>