Programming Example

How JavaScript can change HTML attribute values

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💻 Practical Program

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JavaScript can change HTML attribute values

Program Code

<!DOCTYPE html>
<html>
<body>

<h2>What Can JavaScript Do?</h2>

<p>JavaScript can change HTML attribute values.</p>

<p>In this case JavaScript changes the value of the src (source) attribute of an image.</p>

<button onclick="document.getElementById('myImage').src='colorCar.png'">Colorful Car</button>

<img id="myImage" src="colorCar.png" style="width:100px">

<button onclick="document.getElementById('myImage').src='blackCar.png'">Black and White Car</button>

</body>
</html>

Output

Run above code

Explanation

How to learn from this program

First read the algorithm, then study the program code line by line. After that, compare the code with the output and finally go through the explanation. This approach helps learners understand both the logic and the implementation properly.

Practice suggestion

After understanding this example, try to rewrite the same program without looking at the code. Then change some values or logic and run it again. This helps improve confidence and keeps learners engaged on the page for longer.