javascript - 在同一页面中关闭模式后如何在不重新加载的情况下保持用户输入？

Question

我希望能够保留用户在模式的复选框中决定的数据，并在不离开页面或重新加载的情况下将其与模式外的复选框决定一起发送。

如果用户决定选中模式中的复选框，我如何在按下继续时保留该数据，然后等待提交按钮发送所有复选框的值。

var btn = document.getElementById("myBtn");

// Get the modal
var modal = document.getElementById('myModal');

// Get the button that opens the modal
var btn = document.getElementById("myBtn");

// Get the <span> element that closes the modal
var span = document.getElementsByClassName("close")[0];

// When the user clicks the button, open the modal
btn.onclick = function() {
  modal.style.display = "block";
}

// When the user clicks on <span> (x), close the modal
span.onclick = function() {
  modal.style.display = "none";
}

// When the user clicks anywhere outside of the modal, close it
window.onclick = function(event) {
  if (event.target == modal) {
    modal.style.display = "none";
  }
}

/* The Modal (background) */

.modal {
  display: none;
  /* Hidden by default */
  position: fixed;
  /* Stay in place */
  z-index: 1;
  /* Sit on top */
  padding-top: 100px;
  /* Location of the box */
  left: 0;
  top: 0;
  width: 100%;
  /* Full width */
  height: 100%;
  /* Full height */
  overflow: auto;
  /* Enable scroll if needed */
  background-color: rgb(0, 0, 0);
  /* Fallback color */
  background-color: rgba(0, 0, 0, 0.4);
  /* Black w/ opacity */
}
/* Modal Content */

.modal-content {
  position: relative;
  background-color: #fefefe;
  margin: auto;
  padding: 0;
  border: 1px solid #888;
  width: 80%;
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
  -webkit-animation-name: animatetop;
  -webkit-animation-duration: 0.4s;
  animation-name: animatetop;
  animation-duration: 0.4s
}
/* Add Animation */

@-webkit-keyframes animatetop {
  from {
    top: -300px;
    opacity: 0
  }
  to {
    top: 0;
    opacity: 1
  }
}
@keyframes animatetop {
  from {
    top: -300px;
    opacity: 0
  }
  to {
    top: 0;
    opacity: 1
  }
}
/* The Close Button */

.close {
  color: white;
  float: right;
  font-size: 28px;
  font-weight: bold;
}
.close:hover,
.close:focus {
  color: #000;
  text-decoration: none;
  cursor: pointer;
}
.modal-header {
  padding: 2px 16px;
  background-color: #5cb85c;
  color: white;
}
.modal-body {
  padding: 2px 16px;
}
.modal-footer {
  padding: 2px 16px;
  background-color: #5cb85c;
  color: white;
}

<!-- Trigger/Open The Modal -->
<button id="myBtn">Open Modal</button>

<!-- The Modal -->
<div id="myModal" class="modal">

  <!-- Modal content -->
  <div class="modal-content">
    <div class="modal-header">
      <span class="close">×</span>
      <h2>Modal Header</h2>
    </div>
    <div class="modal-body">
      <p>Some text in the Modal Body</p>
      <p>Some other text...</p>
    </div>
    <div class="modal-footer">
      <h3>Modal Footer</h3>
      <input type="checkbox" name="option" />
      <input type="submit" value="continue" />
    </div>
  </div>


</div>
<div>
  <input type="checkbox" name="value" />
  <input type="submit" value="Send" />
</div>

Answer 1

不要将模式视为独立于页面的实体。模态框只是您页面上的一个普通 div，但它位于居中位置并位于其他内容之上。但它只是一个普通的 div，您可以随时读取模式中元素的值，即使它不可见。

模态复选框中的值仍然可用，就像它们在不同的 div 中一样。如果您的表单处于模式中，那么它们仍然是表单的一部分。如果表单在模式之外，那么您希望随时使用 javascript/jQuery 来读取该复选框并影响您的表单。

这是一个示例，其中表单位于模式之外，并且 javascript 在模式关闭时更新表单字段的值。

$('#myModal').modal('hide');

$('button').click(function(){
  $('#myModal').modal('show');
});

$('#myCB').change(function(){
    $('form input[name=inFormCB]').val( $(this).prop('checked') );
});

form{width:100%;padding:30px;background:wheat;}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<p>INSTRUCTIONS: Open modal. Check/Uncheck the checkbox. Close modal. Observe result.</p>
<button>Open Modal</button>

<form>
  Value of checkbox myCB:<br>
  <input type="text" name="inFormCB" />
</form>

<!-- Modal -->
<div id="myModal" class="modal fade" role="dialog">
  <div class="modal-dialog">

    <!-- Modal content-->
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal">&times;</button>
        <h4 class="modal-title">Modal Header</h4>
      </div>
      <div class="modal-body">
        <p>Some text in the modal.</p>
        <input id="myCB" type="checkbox" /> Got It
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
      </div>
    </div>

  </div>
</div>