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HTML

              
                <form method="post" action="https://basket.step.rakuten.co.jp/rms/mall/bs/cartadd/set" target="_blank" class="cart">
  <input value="店舗id" type="hidden" name="shop_bid">
  <input value="商品id" type="hidden" name="item_id">
  <label for="units">個数</label>
  <div class="input_area">
    <input type="number" class="counter1" aria-label="個数" aria-describedby="units" value="1" maxlength="3" min="1" max="999" data-min="1" data-max="999" pattern="d*" name="units" id="units">
    <button type="button" class="btnspinner" data-cal="-1" data-target=".counter1" style="margin-left: auto;">-</button>
    <button type="button" class="btnspinner" data-cal="1" data-target=".counter1" style="margin-left: 7px;">+</button>
  </div>
  <button type="submit"><svg class="svg-icon" viewBox="0 0 20 20">
      <path
        d="M14.613,10c0,0.23-0.188,0.419-0.419,0.419H10.42v3.774c0,0.23-0.189,0.42-0.42,0.42s-0.419-0.189-0.419-0.42v-3.774H5.806c-0.23,0-0.419-0.189-0.419-0.419s0.189-0.419,0.419-0.419h3.775V5.806c0-0.23,0.189-0.419,0.419-0.419s0.42,0.189,0.42,0.419v3.775h3.774C14.425,9.581,14.613,9.77,14.613,10 M17.969,10c0,4.401-3.567,7.969-7.969,7.969c-4.402,0-7.969-3.567-7.969-7.969c0-4.402,3.567-7.969,7.969-7.969C14.401,2.031,17.969,5.598,17.969,10 M17.13,10c0-3.932-3.198-7.13-7.13-7.13S2.87,6.068,2.87,10c0,3.933,3.198,7.13,7.13,7.13S17.13,13.933,17.13,10">
      </path>
    </svg>商品をかごに追加</button>
</form>
              
            
!

CSS

              
                /* ラベル */

.cart label {
  font-size: .8rem;
  letter-spacing: .12em;
  display: inline-block;
  margin-bottom: .5rem;
}

.input_area {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.8rem;
}

/* 個数入力エリア */

.input_area input {
  font-size: 1rem;
  padding: .6rem;
  background-color: #f5f5f5;
  border: none;
  box-shadow: 0 2px 0 0 #808080;
  border-top-left-radius: 4px;
  border-top-right-radius: 4px;
  font-size: 1.2rem;
}

.input_area input:focus {
  outline: 0;
}

/* FireFox,IEのデフォルトのスピナーを消す */

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

/* Chrome、Safariのデフォルトのスピナーを消す */

input[type="number"] {
  -moz-appearance: textfield;
}

/* 個数増減ボタン */

.btnspinner {
  background-color: white;
  padding: .6rem .85rem;
  border: 1px solid #ccc;
  border-radius: 4px;
  cursor: pointer;
  /* テキストを選択できないようにする */
  -ms-user-select: none;
  -moz-user-select: -moz-none;
  -khtml-user-select: none;
  -webkit-user-select: none;
  user-select: none;
}

.btnspinner:hover {
  background-color: #f8f9fa;
}

.btnspinner:focus {
  outline: 0;
  border-color: #6c757d;
  box-shadow: 0 0 0 0.2rem rgba(108, 117, 125, .5);
}

/* 商品をかごに追加ボタン */

button[type="submit"] {
  width: 100%;
  padding: .9em .5em;
  border-radius: 4px;
  background-color: rgb(191, 0, 0);
  color: white;
  border: none;
  letter-spacing: .12em;
  cursor: pointer;
  display: inline-flex;
  justify-content: center;
}

button[type="submit"]:hover {
  background-color: rgba(191, 0, 0, .95);
}

button[type="submit"]:focus {
  outline: 0;
  box-shadow: 0 0 0 0.2rem rgba(220, 53, 69, .5);
}

/* SVGアイコン */

.svg-icon {
  width: 1.4em;
  height: 1.4em;
  margin-right: .3em;
  vertical-align: text-bottom
}

.svg-icon path,
.svg-icon polygon,
.svg-icon rect {
  fill: #fff
}

.svg-icon circle {
  stroke: #fff;
  stroke-width: 1
              
            
!

JS

              
                $(function() {
    var arySpinnerCtrl = [];
    var spin_speed = 20; //変動スピード
    //長押し押下時
    $('.btnspinner').on('touchstart mousedown click', function(e) {
      if (arySpinnerCtrl['interval']) return false;
      var target = $(this).data('target');
      arySpinnerCtrl['target'] = target;
      arySpinnerCtrl['timestamp'] = e.timeStamp;
      arySpinnerCtrl['cal'] = Number($(this).data('cal'));
      //クリックは単一の処理に留める
      if (e.type == 'click') {
        spinnerCal();
        arySpinnerCtrl = [];
        return false;
      }
      //長押し時の処理
      setTimeout(function() {
        //インターバル未実行中 + 長押しのイベントタイプスタンプ一致時に計算処理
        if (!arySpinnerCtrl['interval'] && arySpinnerCtrl['timestamp'] == e.timeStamp) {
          arySpinnerCtrl['interval'] = setInterval(spinnerCal, spin_speed);
        }
      }, 500);
    });
    //長押し解除時 画面スクロールも解除に含む
    $(document).on('touchend mouseup scroll', function(e) {
      if (arySpinnerCtrl['interval']) {
        clearInterval(arySpinnerCtrl['interval']);
        arySpinnerCtrl = [];
      }
    });
    //変動計算関数
    function spinnerCal() {
      var target = $(arySpinnerCtrl['target']);
      var num = Number(target.val());
      num = num + arySpinnerCtrl['cal'];
      if (num > Number(target.data('max'))) {
        target.val(Number(target.data('max')));
      } else if (Number(target.data('min')) > num) {
        target.val(Number(target.data('min')));
      } else {
        target.val(num);
      }
    }
  }
);
              
            
!
999px

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