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Creating Interactive Styles with JavaScript and CSS

In this tutorial, we'll walk through a simple example of how to use JavaScript to dynamically update CSS properties based on user input. We'll create a square div element and an input field. When the user types into the input field, the div's background color and border-radius will change in real time. This example demonstrates how to make interactive and responsive web elements.

Step 1: HTML Structure

First, let's create the basic HTML structure. We need a div element to represent our box and an input element to capture user input.

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Interactive Styles</title>
    <link rel="stylesheet" href="styles.css">
</head>
<body>
    <div></div>
    <input type="text" placeholder="Enter a color or radius">
    <script src="script.js"></script>
</body>
</html>

Step 2: CSS Styling

Next, we'll style the div element to give it a fixed size, border, and transition effect. This will ensure that changes to its properties are smoothly animated.

/* styles.css */
div {
    height: 200px;
    width: 200px;
    border: 1px solid #333;
    transition: all 0.4s ease;
}

Step 3: JavaScript Functionality

Now, we need to write JavaScript to handle the user input and apply the corresponding styles to the div element. We'll add an event listener to the input field that listens for input events and updates the div's border-radius and background properties based on the input value.

// script.js
let box = document.querySelector("div");
let input = document.querySelector("input");

input.addEventListener("input", () => {
    box.style.borderRadius = input.value;
    box.style.background = input.value;
});

Explanation

  • HTML: We have a div element and an input element. The div will be styled dynamically, and the input will capture user input.
  • CSS: The div is given a fixed height and width, a solid border, and a transition property to animate changes.
  • JS: We select the div and input elements using document.querySelector. We add an event listener to the input element that listens for input events. When the user types into the input field, the border-radius and background properties of the div are updated to match the input value.

Example Inputs:

  • Enter red to change the background color to red.

image

  • Enter 50% to change the div into a circle by setting the border-radius to 50%.

image