# HTML DOM length Property

Element Object

## Example

Find out how many <p> elements there are in the document:

var nodelist = document.getElementsByTagName("P").length;

The result of nodelist will be:

4
Try it yourself »

More "Try it Yourself" examples below.

## Definition and Usage

The length property returns the number of nodes in a NodeList object.

A Node object's collection of child nodes is an example of a NodeList object.

The length property is useful when you want to loop through the nodes in a node list (See "More Examples" below).

This property is read-only.

Tip: Use the item() method to return a node at the specified index in a NodeList object.

## Browser Support

Property |  |  |  |  |
--- | --- | --- | --- | --- | ---
length | Yes | Yes | Yes | Yes | Yes

## Syntax

nodelist.length

## Technical Details

Return Value: | A Number, representing the number of nodes in the nodelist
DOM Version | Core Level 1 Nodelist Object

## More Examples

## Example

Find out how many <p> elements there are inside a <div> element:

var div = document.getElementById("myDIV"); // Get the <div> element with id="myDIV"
var nodelist = div.getElementsByTagName("P").length; // Get the number of <p> elements inside <div>

The result of nodelist will be:

3
Try it yourself »

## Example

Loop through all <p> elements inside a <div> element, and change the background color of each <p>:

var div = document.getElementById("myDIV");
var nodelist = div.getElementsByTagName("P");
var i;
for (i = 0; i < nodelist.length; i++) {
nodelist[i].style.backgroundColor = "red";
}
Try it yourself »

## Example

Return the number of child nodes of the <body> element:

var nodelist = document.body.childNodes.length;

The result of nodelist will be:

12
Try it yourself »

## Example

Loop through the child nodes of <body> and output the node name of each child node:

var nodelist = document.body.childNodes;
var txt = "";
var i;
for (i = 0; i < nodelist.length; i++) {
txt = txt + nodelist[i].nodeName + "<br>";
}

The result of txt will be:

#comment
#text
P
#text
BUTTON
#text
P
#text
P
#text
SCRIPT
#text
Try it yourself »

## Related Pages

HTML DOM Reference: nodelist.item() Method

HTML DOM Reference: element.childNodes Property

HTML DOM Reference: element.getElementsByClassName() Method

HTML DOM Reference: element.getElementsByTagName() Method

HTML DOM Reference: element.querySelectorAll() Method

HTML DOM Reference: document.getElementsByClassName() Method

HTML DOM Reference: document.getElementsByName() Method

HTML DOM Reference: document.getElementsByTagName() Method

HTML DOM Reference: document.querySelectorAll() Method

Element Object

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