XML DOM insertBefore() Method
Element Object
Example
The following code fragment loads "books.xml" into xmlDoc, creates a new <book> node and inserts it before the last <book> element:
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (xhttp.readyState == 4 && xhttp.status == 200) {
myFunction(xhttp);
}
};
xhttp.open("GET", "books.xml", true);
xhttp.send();
function myFunction(xml) {
var xmlDoc = xml.responseXML;
var newNode = xmlDoc.createElement("book");
var x = xmlDoc.documentElement;
var y = xmlDoc.getElementsByTagName("book");
document.getElementById("demo").innerHTML =
"Book elements before: " + y.length + "<br>";
x.insertBefore(newNode, y[3]);
document.getElementById("demo").innerHTML +=
"Book elements after: " + y.length;
}
xhttp.onreadystatechange = function() {
if (xhttp.readyState == 4 && xhttp.status == 200) {
myFunction(xhttp);
}
};
xhttp.open("GET", "books.xml", true);
xhttp.send();
function myFunction(xml) {
var xmlDoc = xml.responseXML;
var newNode = xmlDoc.createElement("book");
var x = xmlDoc.documentElement;
var y = xmlDoc.getElementsByTagName("book");
document.getElementById("demo").innerHTML =
"Book elements before: " + y.length + "<br>";
x.insertBefore(newNode, y[3]);
document.getElementById("demo").innerHTML +=
"Book elements after: " + y.length;
}
The output of the code above will be:
Book elements before: 4
Book elements after: 5
Try it Yourself »
Book elements after: 5
Definition and Usage
The insertBefore() method inserts a new child node before an existing child node.
This method returns the new child node.
Syntax
elementNode.insertBefore(new_node,existing_node)
| Parameter | Description |
|---|---|
| new_node | Required. The node to insert |
| existing_node | Required. The existing node. The new node is inserted before this node. |
Element Object
