复选框 模态 错误与选中

Question

代码应该不言自明。我对两个复选框都使用相同的更新功能，但模态外的复选框成功打印了它是否被选中，但模态中的那个没有。知道为什么吗？

$("#nonModalCheckbox").on("click", update);
$("#modalCheckbox").on("click", update);
$("#modal_show").on("click", showModal);
function showModal() {
  $("#myModal").modal("show");
}
function update() {
  console.log($(this).prop("checked"))
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<input type="checkbox" id="nonModalCheckbox">test
<div class="modal fade" id="myModal" role="dialog">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal">&times;
    </button>
        <h4 class="modal-title">Title</h4>
      </div>
      <div class="modal-body" id="modal_body">
        <div class="checkbox" id="modalCheckbox"><label><input type="checkbox">modal test</label></div>
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" id="apply">Apply</button>
      </div>
    </div>
  </div>
</div>
<button id="modal_show">Show Modal!</button>

Answer 1

您已将 id modalCheckbox分配给div，而不是模态内部的 checkbox。以下将起作用。

<input type="checkbox" id="modalCheckbox">modal test</label>

$(document).ready(function () {
	$("#nonModalCheckbox").on("click", update);
	$("#modalCheckbox").on("click", update);
	$("#modal_show").on("click", showModal);
	function showModal() {
		$("#myModal").modal("show");
	}
	function update() {
		console.log($(this).prop("checked"))
	}
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<input type="checkbox" id="nonModalCheckbox">test
<div class="modal fade" id="myModal" role="dialog">
	<div class="modal-dialog">
		<div class="modal-content">
			<div class="modal-header">
				<button type="button" class="close" data-dismiss="modal">&times;
				</button>
				<h4 class="modal-title">Title</h4>
			</div>
			<div class="modal-body" id="modal_body">
				<div class="checkbox">
					<label>
						<input type="checkbox" id="modalCheckbox">modal test</label>
				</div>
			</div>
			<div class="modal-footer">
				<button type="button" class="btn btn-default" id="apply">Apply</button>
			</div>
		</div>
	</div>
</div>
<button id="modal_show">Show Modal!</button>