Question

我在Web App中使用Firebase数据库，并且还有这样的数据：

Show Image

如何删除标题中标有“Apple”的整个记录（标记在图片中）？

我写了下面的代码，但它没有用。

请帮助。

<div class="container-fluid">
    <form id="formset" class="form-inline" action="" method="post"> <!--added id="formset" to the form element-->
        {% csrf_token %}
        {{ form }}

        <table class="table">
            {{ formset_new.management_form }}
            <div>
            <br><h4><strong>New</strong></h4><br>
            {% include "reports/formsets.html" with formset=formset_new formset_class_name='new' prefix="new" %}
            </div>
        </table>
        <table class="table">
            {{ formset_renewal.management_form }}
            <div>
                <br><h4><strong>Renewals</strong></h4><br>
            {% include "reports/formsets.html" with formset=formset_renewal formset_class_name='renewal' prefix="renewal" %}
            </div>
        </table>
       </div>
    </form>
</div>
<script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
<script src="{% static 'js/jquery.formset.js' %}"></script>
<br>

<div class="container">
  <!-- Trigger the modal with a button -->
  <button type="button" class="btn btn-info btn-lg" data-toggle="modal" data-target="#myModal"><strong>Submit</strong></button>

  <!-- Modal -->
  <div class="modal fade" id="myModal" 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">Before You Submit!!</h4>
        </div>
        <div class="modal-body">
            <p>Please review and make sure that all line items are correct and that the <strong>"Check if No New Items"</strong> is checked if there are no new items for that catagory. If all is correct, please select the <strong>Save and Email</strong> button.</p>
        </div>
        <div class="modal-footer">
            <input type="submit" form="formset" class="btn btn-primary" value="Save and Email to Corporate"><!--added form id, form="formset" , to input element-->
          <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
        </div>
      </div>

    </div>
  </div>

</div>

它没有在控制台中给我任何错误。

Answer 1

您正在订购/过滤错误的属性。你有title属性的值，所以应该对它进行排序：

var abc = firebase.database().ref('firebase-test');
var key_to_delete = 'Apple';
var query = abc.orderByChild('title').equalTo(key_to_delete);
query.on('child_added', function(snapshot)
{
    snapshot.ref.remove();
});

备选方案，因为您知道要删除的项目的键，所以您也可以在没有查询的情况下删除该项目：

var abc = firebase.database().ref('firebase-test');
abc.child("KISNx87aYigsH3ILp0D").remove();

如何删除指定标题的firebase中的特定记录

1 个答案: