JavaScript: Modify paragraph text style through javascript code using button

Last update on March 06 2025 07:01:17 (UTC/GMT +8 hours)

JavaScript DOM: Exercise-1 with Solution

Style Paragraph

Here is a sample html file with a submit button. Now modify the style of the paragraph text through javascript code.

Sample HTML file:

<!DOCTYPE html>
<html><head>
<meta charset=utf-8 />
<title>JS DOM paragraph style</title>
</head> 
<body>
<p id ='text'>JavaScript Exercises - w3resource</p> 
<div>
<button id="jsstyle"
onclick="js_style()">Style</button>
</div>
</body>
</html>

Tips: Clicking on the button the font, font size, and color of the paragraph text will be changed.

Sample Solution:

HTML Code:

<!-- Declaration of HTML document type -->
<!DOCTYPE html>
<!-- Start of HTML document -->
<html>
<head>
<!-- Declaring character encoding -->
<meta charset=utf-8 />
<!-- Setting title of the document -->
<title>JS DOM paragraph style</title>
</head> 
<!-- Start of body section -->
<body>
<!-- Creating a paragraph element with id 'text' -->
<p id ='text'>JavaScript Exercises - w3resource</p> 
<!-- Creating a division element -->
<div>
<!-- Creating a button element with id 'jsstyle' and onclick event -->
<button id="jsstyle" onclick="js_style()">Style</button>
</div>
<!-- End of body section -->
</body>
<!-- End of HTML document -->
</html>

JavaScript Code:

// Function declaration for js_style
function js_style() 
{
    // Setting font size using JavaScript
    text.style.fontSize = "14pt";
    // Setting font family using JavaScript
    text.style.fontFamily = "Comic Sans MS";
    // Setting text color using JavaScript
    text.style.color = "green";
}

Output:

Flowchart:

Live Demo:

See the Pen javascript-dom-exercise-1 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

Write a JavaScript function that toggles the paragraph style between two distinct style sets each time a button is clicked.
Write a JavaScript function that randomly selects font family, font size, and color from predefined arrays and applies them to the paragraph.
Write a JavaScript function that applies a gradient background effect to the paragraph by dynamically setting its CSS background-image property.
Write a JavaScript function that reads a CSS class name from a dropdown menu and applies that class to the paragraph element on button click.

Improve this sample solution and post your code through Disqus.

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