Question

我想使用删除按钮删除网站上的数据。数据通过在javascript中创建的按钮显示在“ #table_body”中。我的想法是，每行数据下方都有一个删除按钮。我的问题是如何通过按删除按钮删除基于唯一ID /参考ID的数据。

我尝试命名为“ .child（'123'）。remove（）;”而不是“ .child（key）.remove（）;”而且有效。但是，它仅根据123 ID删除数据。我希望它删除具有唯一ID的数据。这是Javascript代码：

var rootRef = firebase.database().ref().child("User");

rootRef.on("child_added", snap => {

  var name = snap.child("name").val();
  var add = snap.child("address").val();
  var contact = snap.child("contact").val();



  $("#table_body").append("<tr><td>" + name + "</td><td>" + add + "</td><td>" + contact +  "</td><td>");
  $("#table_body").append('<button id="1" onClick="reply_click(this.id)">Delete</button></td></tr>');

});

function reply_click(clicked_id){
  	firebase.database().ref("User").child(key).remove();
  }

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    Happy Paws
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          HAPPY PAWS
        </a>
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            <a class="nav-link" href="./dashboard.html">
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              <p>Dashboard</p>
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              <p>Account</p>
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                  <a class="dropdown-item" href="./icons.html"><p style="color:green;">Dog</p></a>
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              <i class="material-icons">logout</i>
              <p>logout</p>
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                  <h3 class="card-title">
                    <small></small>
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                  <div class="stats">
                    
                  </div>
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              </div>
            </div>
            <div class="col-xl-3 col-lg-6 col-md-6 col-sm-6">
		<a href="reports.html">
              <div class="card card-stats">
                <div class="card-header card-header-success card-header-icon">
                  <div class="card-icon">
                    <i class="material-icons">report_problem</i>
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				   <p class="card-link" href="./dashboard.html">
                  <p class="card-category" >Reports</p>
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			<a href=".">
              <div class="card card-stats">
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                  <div class="card-icon">
                    <i class="material-icons">pets</i>
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                  <h3 class="card-title"></h3>
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                <div class="card-footer">
                  <div class="stats">
                    
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                  <div class="card-icon">
                    <i class="material-icons">add_shopping_cart</i>
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                  <h3 class="card-title"></h3>
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            <div class="col-lg-12 col-md-12">
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              <div class="card">
                <div class="card-header card bg-success text-white">
                  <h4 class="card-title">Account List</h4>
                 
                </div>
                <div class="card-body table-responsive">
                  <table class="table table-hover">
                    <thead class="text-warning">
                      <th>Name</th>
                      <th>Address</th>
                      <th>Contact</th>
                      <th>Delete</th>
                    </thead>
                    <tbody id="table_body">
                    </tbody>
                  </table>
                </div>
              </div>
            </div>
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Answer 1

要获取key，您可以执行以下操作：

rootRef.on("child_added", snap => {
  var key     = snap.key;
  var name    = snap.child("name").val();
  var add     = snap.child("address").val();
  var contact = snap.child("contact").val();

  $("#table_body").append("<tr><td>" + name + "</td><td>" + add + "</td><td>" + contact +  "</td><td>");
  $("#table_body").append('<button id="1" onClick="reply_click(' + key + ')">Delete</button></td></tr>');

});

function reply_click(clicked_id){
  firebase.database().ref("User").child(clicked_id).remove();
}

snap.key将能够检索数据库中的唯一ID。

从文档中

key

此DataSnapshot位置的键（路径的最后一部分）。

删除具有唯一ID作为参考的Firebase上的数据

1 个答案: