嗨，我有一個例子，如果選擇下拉串列 - 可回收物的價格會出現一個隱藏欄位，但是當我選擇服務充電器時，隱藏欄位如何消失
我嘗試使用 .attr 添加回來，但似乎不起作用
$("#select-price-mode").change(function() {
if (this.value === "Price By Recyclables") {
$('.col').removeAttr('hidden');
}
});<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="form-row">
<div class="col">
<label for="select-price-mode" class="col-form-label">Price Mode</label>
<select class="select-price-mode custom-select-sm col-10" id="select-price-mode" required>
<option selected disabled value="">Select ....</option>
<option value="Price By Recyclables">Price By Recyclables</option>
<option value="Service Charger">Service Charger</option>
</select>
</div>
<div class="col" hidden>
<label for="select-payment-frequency" class="col-form-label">Payment Frequency</label>
<select class="select-payment-frequency custom-select-sm col-10" id="select-payment-frequency" required>
<option selected disabled value="">Select ....</option>
</select>
</div>uj5u.com熱心網友回復：
我認為這將解決您的問題
$("#select-price-mode").change(function() {
if (this.value === "Price By Recyclables") {
$('.col').removeAttr('hidden');
} else {
$('.col').attr('hidden', '');
}
});
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