HTML JavaScript click read more

 

HTML JavaScript

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JavaScript makes HTML pages more dynamic and interactive.

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The HTML <script> Tag

The HTML <script> tag is used to define a client-side script (JavaScript).

The <script> element either contains script statements, or it points to an external script file through the src attribute.

Common uses for JavaScript are image manipulation, form validation, and dynamic changes of content.

To select an HTML element, JavaScript most often uses the document.getElementById() method.

This JavaScript example writes "Hello JavaScript!" into an HTML element with id="demo":

Example

<script>
document.getElementById("demo").innerHTML = "Hello JavaScript!";
</script>

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A Taste of JavaScript

Here are some examples of what JavaScript can do:

Example

JavaScript can change content:

document.getElementById("demo").innerHTML = "Hello JavaScript!";

Example

JavaScript can change styles:

document.getElementById("demo").style.fontSize = "25px";
document.getElementById("demo").style.color = "red";
document.getElementById("demo").style.backgroundColor = "yellow";

Example

JavaScript can change attributes:

document.getElementById("image").src = "picture.gif";