Returns a reference to the element by its ID; the ID is a string which can be used to identify the element; it can be established using the id attribute in HTML, or from script.


element = document.getElementById(id);


is a reference to an Element object, or null if an element with the specified ID is not in the document.
  is a case-sensitive string representing the unique ID of the element being sought.


<!DOCTYPE html>
  <title>getElementById example</title>
  function changeColor(newColor) {
    var elem = document.getElementById("para1"); = newColor;
  <p id="para1">Some text here</p>
  <button onclick="changeColor('blue');">blue</button>
  <button onclick="changeColor('red');">red</button>


New users should note that the capitalization of 'Id' in the name of this method must be correct for the code to function; "getElementByID" does not work, however natural it may seem.

If you use getElementById().you must use document to the root element.


<!doctype html>
    <meta charset="UTF-8">
    <div id="parent-id">
        <p>hello word1</p>
        <p id="test1">hello word2</p>
        <p >hello word3</p>
        <p>hello word4</p>
        var parentDOM = document.getElementById("parent-id");
        var test1=parentDOM.getElementById("test1");
        //throw error
        //Uncaught TypeError: parentDOM.getElementById is not a function

If there is no element with the given id, this function returns null. Note that the id parameter is case-sensitive, so document.getElementById("Main") will return null instead of the element <div id="main"> because "M" and "m" are different for the purposes of this method.

Elements not in the document are not searched by getElementById(). When creating an element and assigning it an ID, you have to insert the element into the document tree with Node.insertBefore() or a similar method before you can access it with getElementById():

var element = document.createElement("div"); = 'testqq';
var el = document.getElementById('testqq'); // el will be null!

Non-HTML documents. The DOM implementation must have information that says which attributes are of type ID. Attributes with the name "id" are not of type ID unless so defined in the document's DTD. The id attribute is defined to be of ID type in the common cases of XHTML, XUL, and other. Implementations that do not know whether attributes are of type ID or not are expected to return null.


Specification Status Comment
Document Object Model (DOM) Level 1 Specification
The definition of 'getElementById' in that specification.
Recommendation Initial definition for the interface
Document Object Model (DOM) Level 2 Core Specification
The definition of 'getElementById' in that specification.
Recommendation Supersede DOM 1
Document Object Model (DOM) Level 3 Core Specification
The definition of 'getElementById' in that specification.
Recommendation Supersede DOM 2
The definition of 'getElementById' in that specification.
Living Standard Intend to supersede DOM 3

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 1.0 1.0 (1.7 or earlier) 5.5 7.0 1.0
Feature Android Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
Basic support 1.0 1.0 (1.0) 6.0 6.0 1.0

See also

  • Document reference for other methods and properties you can use to get references to elements in the document.
  • Document.querySelector() for selectors via queries like 'div.myclass'
  • xml:id - has a utility method for allowing getElementById() to obtain 'xml:id' in XML documents (such as returned by Ajax calls)


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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.

API Document DOM Elements id Method Reference Web