所以我使用limitToLast函数成功地显示了我的firebase中的1个数据库。这是网页的样子有点奇怪如何使用javascript从firebase控制台显示我的所有数据库(所选父级的所有子级(？
我想显示的firebase中的数据库列表下面是我的代码：
firebase.initializeApp(config);
var order = firebase.database().ref("order");
order.on("value", function(snapshot) {
console.log(snapshot.val());
}, function (error) {
console.log("Error: " + error.code);
});
var submitOrder = function () {
var orderId = $("#orderOrderId").val();
var shipping = $("#orderShipping").val();
var subtotal = $("#orderSubtotal").val();
var total = $("#orderTotal").val();
};
order.limitToLast(1).on('child_added', function(childSnapshot) {
order = childSnapshot.val();
$("#orderId").html(order.orderId)
$("#shipping").html(order.shipping)
$("#subtotal").html(order.subtotal)
$("#total").html(order.total)
$("#link").attr("https://wishywashy-179b9.firebaseio.com/", order.link)
});<html>
<head>
<script src="https://www.gstatic.com/firebasejs/5.3.0/firebase.js"></script>
<script src="https://cdn.firebase.com/libs/firebaseui/2.5.1/firebaseui.js"></script>
<link type="text/css" rel="stylesheet" href="https://cdn.firebase.com/libs/firebaseui/2.5.1/firebaseui.css" />
<!-- <script src='https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js'></script> -->
<!-- Load the jQuery library, which we'll use to manipulate HTML elements with Javascript. -->
<script src="https://code.jquery.com/jquery-2.2.0.min.js"></script>
<!-- Load Bootstrap stylesheet, which will is CSS that makes everything prettier and also responsive (aka will work on all devices of all sizes). -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous">
</head>
<!-- <script type = "text/javascript" src = "data.js"></script> -->
<body>
<script type = "text/javascript" src = "data.js"></script>
<div class="container">
<h1>Merchant Portal</h1>
<h3>Order Lists</h3>
<table class="table table-striped">
<thead>
<tr>
<th>Order ID</th>
<th>Shipping Price</th>
<th>Subtotal</th>
<th>Total</th>
</tr>
</thead>
<tbody>
<tr>
<!-- This is empty for now, but it will be filled out by an event handler in application.js with the most recent recommendation data from Firebase. -->
<td id="orderId"></td>
<td id="shipping"></td>
<td id="subtotal"></td>
<td id="total"></td>
</tr>
</tbody>
</table>
</body>
</html>您需要为每个订单生成一个新的<tr>。一个非常简单的方法就是在on('child_added'回调中生成DOM元素：
var table = document.querySelector("tbody");
order.on('child_added', function(childSnapshot) {
order = childSnapshot.val();
var tr = document.createElement('tr');
tr.appendChild(createCell(order.orderId));
tr.appendChild(createCell(order.shipping));
tr.appendChild(createCell(order.subTotal));
tr.appendChild(createCell(order.total));
table.appendChild(tr);
});
正如您所看到的，这段代码为每个子级/订单创建了一个新的<tr>，并用简单的DOM方法填充它。然后，它将新的<tr>添加到表中。
此代码使用一个简单的助手函数来处理<td>元素的重复创建，其中包含一个文本节点：
function createCell(text) {
var td = document.createElement('td');
td.appendChild(document.createTextNode(text));
return td;
}