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DOM CSS
The HTML DOM enables JavaScript to change the style of HTML elements.
Changing HTML Style
To change the style of an HTML element, use this syntax:
document.getElementById(id).style.property = new style
The following example changes the style of a <p> element.
Example
<!DOCTYPE html>
<html>
<body>
<h2>JavaScript HTML DOM</h2>
<p>Changing the HTML style:</p>
<p id=”p1″>Hello World!</p>
<p id=”p2″>Hello World!</p>
<script>
document.getElementById(“p2”).style.color = “blue”;
document.getElementById(“p2”).style.fontFamily = “Arial”;
document.getElementById(“p2”).style.fontSize = “larger”;
</script>
</body>
</html>
Output
JavaScript HTML DOM
Changing the HTML style:
Hello World!
Hello World!
Using Events
The HTML DOM executes the code when an event occurs.
Events are generated by the browser when “things happen” to HTML elements:
- An element is clicked on.
- The page has loaded.
- Input fields are changed.
This example is used to change the style of the HTML element with id=”id1″, when the user clicks a button:
Example
<!DOCTYPE html>
<html>
<body>
<h1 id=”id1″>My Heading 1</h1>
<button type=”button”
onclick=”document.getElementById(‘id1’).style.color = ‘red'”>
Click Me!</button>
</body>
</html>
Output