JavaScript Introduction

Note: This page contains some examples of what JavaScript can do.

JavaScript Can Change HTML Content

One of many JavaScript HTML methods is getElementById().

This example uses the method to “find” an HTML element (with id=”demo”) and changes the element content (innerHTML) to “Hello JavaScript”:

What Can JavaScript Do?

JavaScript can change HTML content.

Note: JavaScript accepts both double and single quotes:

JavaScript Can Change HTML Styles (CSS)

Changing the style of an HTML element, is a variant of changing an HTML attribute:

What Can JavaScript Do?

JavaScript can change the style of an HTML element.

JavaScript Can Hide HTML Elements

Hiding HTML elements can be done by changing the display style:



What Can JavaScript Do?

JavaScript can hide HTML elements.



JavaScript Can Show HTML Elements

Showing hidden HTML elements can also be done by changing the display style:



What Can JavaScript Do?

JavaScript can show hidden HTML elements.