XML DOM insertBefore() Method
Node Object
Example
The following code fragment loads "books.xml", creates a new <book> node and inserts it before the last <book> node:
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;
}
The output of the code above will be:
Book elements before: 4
Book elements after: 5
Try it yourself »
Definition and Usage
The insertBefore() method inserts a new child node before a specified child node of the current node.
Note: If the newchild is already in the tree, it is first removed.
Browser Support
The insertBefore() method is supported in all major browsers.
Syntax
nodeObject.insertBefore(newchild,existingnode)Parameters
| Parameter | Type | Description |
|---|---|---|
| newchild | Node object | Required. The new child node to insert |
| existingnode | Node object | Required. The node to insert the new child node before. If existingnode is null, insert newchild at the end of the list of children |
Return Value
| Type | Description |
|---|---|
| Node object | The inserted node |
Technical Details
| DOM Version | Core Level 1 Node Object. Modified in DOM Level 3 |
|---|
Node Object
