➥ JS Tutorial
- JS HOME
- JS introduction
- JS Where to
- JS Output
- JS Statements
- JS Syntax
- JS Variables
- JS Operators
- JS Assignment
- JS Data Types
- JS Functions
- JS Objects
- JS Events
- JS Sting methods
- JS String Search
- JS Arrays Methods
- JS Arrays
- JS Sorting Arrays
- JS Array Iteration
- JS Math Object
- JS Comparison & Logical Operators
- JS if else and else if
- JS Switch Statement
- JS For Loop
- JS For In
- JS For Of
- JS While Loop
- JavaScript Break
- JS Sets
- JavaScript typeof
- JS Type Conversion
- JS Bitwise Operations
- JS JSON
- JS Best Practices
- JS Reserved Words
- JS Number Methods
➥ JS Objects
➥ JS Functions
➥ JS Classes
➥ JS HTML DOM
- JavaScript HTML DOM
- JS HTML DOM Document
- JS HTML DOM Elements
- Changing HTML
- JS Forms
- JS HTML DOM - CSS
- DOM Events
- HTML DOM Event Listener
➥ JS Browser BOM
➥ JS Web APIs
➥ JS AJAX
➥ JS JSON
Tutorial
Finding HTML Elements
Often, with JavaScript, you want to manipulate HTML elements.
To do so, you have to find the elements first. There are several ways to do this:
• Finding HTML elements by id
• Finding HTML elements by tag name
• Finding HTML elements by class name
• Finding HTML elements by CSS selectors
• Finding HTML elements by HTML object collections
Finding HTML Element by Id
The easiest way to find an HTML element in the DOM, is by using the element id.
This example finds the element with id="intro".
If the element is found, the method will return the element as an object (in myElement).
If the element is not found, myElement will contain null.
EXAMPLE ❯
Finding HTML Elements by Tag Name
This example finds all <p> elements:
Example:
<p id="demo"></p>
<script>
const element = document.getElementsByTagName("p");
document.getElementById("demo").innerHTML = 'The text in first paragraph (index 0) is: ' + element[0].innerHTML;
</script>
This below example finds the element with id="main", and then finds all <p> elements inside "main":
EXAMPLE ❯
Finding HTML Elements by Class Name
If you want to find all HTML elements with the same class name, use getElementsByClassName().
This example returns a list of all elements with class="intro".
Example:
const x = document.getElementsByClassName("intro");
EXAMPLE ❯
Finding HTML Elements by CSS Selectors
If you want to find all HTML elements that match a specified CSS selector (id, class names, types, attributes, values of attributes, etc), use the querySelectorAll() method.
This example returns a list of all <p> elements with class="intro".
EXAMPLE ❯
Finding HTML Elements by HTML Object Collections
This example finds the form element with id="frm1", in the forms collection, and displays all element values: