无法从bootStrap datepicker读取值

Question

我目前正在使用bootstrap datepicker，我遇到了问题。我想以格式（dd / mm / yyyy）读取datepicker中的值。但是，即使用户选择了日期值，我仍然会收到一个空字符串。这是我的代码

$('#startDateInput').datepicker({
        format: 'dd/mm/yyyy',
    });

    $('#saveButton').on('click', function () {
        var collectedStartDate = $('#startDateInput').datepicker().val();
        alert(collectedStartDate);
    });

<link href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-datepicker/1.8.0/css/bootstrap-datepicker.css" rel="stylesheet"/>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-datepicker/1.8.0/js/bootstrap-datepicker.js"></script>
<div class="form-group col-md-12">
    <label class="control-label col-md-4" for="startDateInput">Start date</label>
    <div class="input-group date" id="startDateInput" style="max-width: 280px" data-provide="datepicker">
        <input type="text" class="form-control">
        <div class="input-group-addon">
            <span class="glyphicon glyphicon-calendar"></span>
        </div>
    </div>
</div>

<div class="form-group col-md-12">
    <label class="control-label col-md-1"></label>
    <div class="col-md-10">
        <div class="pull-right">
            <input type="button" class="btn btn-primary" value="Save" id="saveButton" />
        </div>
    </div>
</div>

Answer 1

修改

.datepicker('getDate');会返回JavaScript date object

var dateInput = $('#startDateInput').datepicker({
  format: 'dd/mm/yyyy',
});

$('#saveButton').on('click', function() {
  var collectedStartDate = dateInput.datepicker('getDate');
  alert(collectedStartDate.getDate() + '/' + (collectedStartDate.getMonth() + 1) + '/' +  collectedStartDate.getFullYear());
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-datepicker/1.8.0/css/bootstrap-datepicker.min.css" rel="stylesheet" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-datepicker/1.8.0/js/bootstrap-datepicker.min.js"></script>

<div class="form-group col-md-12">
  <label class="control-label col-md-4" for="startDateInput">Start date</label>
  <div class="input-group date" id="startDateInput" style="max-width: 280px" data-provide="datepicker">
    <input type="text" class="form-control">
    <div class="input-group-addon">
      <span class="glyphicon glyphicon-calendar"></span>
    </div>
  </div>
</div>

<div class="form-group col-md-12">
  <label class="control-label col-md-1"></label>
  <div class="col-md-10">
    <div class="pull-right">
      <input type="button" class="btn btn-primary" value="Save" id="saveButton" />
    </div>
  </div>
</div>

Answer 2

尝试

$('#startDateInput').data('datepicker').getFormattedDate('dd/mm/yyyy')

$('#startDateInput').datepicker({
  format: 'dd/mm/yyyy',
});

$('#saveButton').on('click', function() {
  var collectedStartDate = $('#startDateInput').data('datepicker').getFormattedDate('dd/mm/yyyy');
  alert(collectedStartDate);
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-datepicker/1.8.0/css/bootstrap-datepicker.min.css" rel="stylesheet" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-datepicker/1.8.0/js/bootstrap-datepicker.min.js"></script>

<div class="form-group col-md-12">
  <label class="control-label col-md-4" for="startDateInput">Start date</label>
  <div class="input-group date" id="startDateInput" style="max-width: 280px" data-provide="datepicker">
    <input type="text" class="form-control">
    <div class="input-group-addon">
      <span class="glyphicon glyphicon-calendar"></span>
    </div>
  </div>
</div>

<div class="form-group col-md-12">
  <label class="control-label col-md-1"></label>
  <div class="col-md-10">
    <div class="pull-right">
      <input type="button" class="btn btn-primary" value="Save" id="saveButton" />
    </div>
  </div>
</div>