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DHTML JavaScript

JavaScript can create dynamic HTML content:

Date:

JavaScript Alone

If you have studied JavaScript, you already know that the statement:

document.write()

can be used to display dynamic content to a web page.

Example

Using JavaScript to display the current date:

<html>
<body>

<script type="text/javascript">
document.write(Date());
</script>

</body>
</html>

Try it Yourself

JavaScript and the HTML DOM

With HTML 4, JavaScript can also be used to change the inner content and attributes of HTML elements dynamically.

To change the content of an HTML element use:

document.getElementById(id).innerHTML=new HTML

To change the attribute of an HTML element use:

document.getElementById(id).attribute=new value

You will learn more about JavaScript and the HTML DOM in the next chapter of this tutorial.

JavaScript and HTML Events

New to HTML 4 is the ability to let HTML events trigger actions in the browser, like starting a JavaScript when a user clicks on an HTML element.

To execute code when a user clicks on an element, use the following event attribute:

onclick=JavaScript

You will learn more about JavaScript and HTML Events in a later chapter.

JavaScript and CSS

With HTML 4, JavaScript can also be used to change the style of HTML elements.

To change the style of an HTML element use:

document.getElementById(id).style.property=new style

You will learn more about JavaScript and CSS in a later chapter of this tutorial.

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