jQuery append html元件

Question

我有2个p元素如下

<p id="booking-sum-start"><span id="booking-sum-start-new"><span id="booking-summary-start-date"><?php echo $booking->start_date;?></span></span></p>
<p id="booking-sum-end"><span id="booking-sum-end-new"><span id="booking-summary-end-date"><?php echo $booking->end_date;?></span></span></p>

我有一个 select 日期的日期选择器，我正在显示如上所述的选定日期。 我的方法是每次用户选择一个日期范围时，我都会删除 ID booking-summary-start-date和booking-summary-end-date的span元素，并使用.append的 .append 方法更新span ，如下所示。

      let booking_start_date = document.getElementById("booking-summary-start-date");
      let booking_end_date = document.getElementById("booking-summary-end-date");

      booking_start_date.remove();
      booking_end_date.remove();

      let booking_start_date_container = document.getElementById("booking-sum-start-new");
      let booking_end_date_container = document.getElementById("booking-sum-end-new");

      booking_start_date_container.append(`<span id="booking-summary-start-date">${start_date}</span>`);
      booking_end_date_container.append(`<span id="booking-summary-end-date">${end_date}</span>`);

此处删除部分有效，但在附加时会附加一个字符串 for ex: ${start_date} 而不是 span 元素。

我如何 append 跨度元素而不是字符串？

Answer 1

如果您希望将子节点添加到容器跨度，则需要createElement()和.appendChild() ：

let start_span = document.createElement('span');
start_span.id = 'booking-summary-start-date';
start_span.innerText = start_date;
booking_start_date_container.appendChild(start_span);

let end_span = document.createElement('span');
end_span.id = 'booking-summary-end-date';
end_span.innerText = end_date;
booking_end_date_container.appendChild(end_span);

在这里，我创建了一个片段来演示它是如何工作的：

 let booking_start_date = document.getElementById("booking-summary-start-date"); let booking_end_date = document.getElementById("booking-summary-end-date"); booking_start_date.remove(); booking_end_date.remove(); let booking_start_date_container = document.getElementById("booking-sum-start-new"); let booking_end_date_container = document.getElementById("booking-sum-end-new"); let start_date = '123'; let end_date = '456'; let start_span = document.createElement('span'); start_span.id = 'booking-summary-start-date'; start_span.innerText = start_date; booking_start_date_container.appendChild(start_span); let end_span = document.createElement('span'); end_span.id = 'booking-summary-end-date'; end_span.innerText = end_date; booking_end_date_container.appendChild(end_span);

 <p id="booking-sum-start"><span id="booking-sum-start-new"><span id="booking-summary-start-date"><?php echo $booking->start_date;?></span></span></p> <p id="booking-sum-end"><span id="booking-sum-end-new"><span id="booking-summary-end-date"><?php echo $booking->end_date;?></span></span></p>