Community
Learn
Tools Library
AI Tools
Leisure
search
English
Home Web Front-end Front-end Q&A How to implement JavaScript hover function in HTML

How to implement JavaScript hover function in HTML

PHPz
PHPz
Apr 25, 2023 am 10:46 AM

JavaScript hover function means that when the mouse pointer hovers over an element, you can perform specified operations, such as displaying prompt information, changing element styles, etc. This feature is very common in web design and can provide users with a better interactive experience. To implement JavaScript hover functionality in HTML, you can follow the steps below.

Step one: Write HTML code

First, you need to write basic HTML code, including the elements that need to implement the hover function. For example, we can create a simple div element as shown below: 

<div id="myDiv">这是一个 div 元素</div>
Copy after login

Step 2: Add JavaScript code

Next, you need to add JavaScript code to implement the hover function. You can place the JavaScript code in the head element of the HTML file, or you can place it in an external .js file and then reference it. For example, the following is a simple JavaScript code: 

const myDiv = document.getElementById("myDiv");
myDiv.addEventListener("mouseover", function() {
  myDiv.style.backgroundColor = "red";
});

myDiv.addEventListener("mouseout", function() {
  myDiv.style.backgroundColor = "white";
});
Copy after login

This code first obtains the element with the id "myDiv" through the document.getElementById("myDiv") method. Then, add two event listeners to the element through the addEventListener() method. The first listener is mouseover, which represents an event that is triggered when the mouse pointer hovers over the element. When the event is triggered, we can set the background color of the element to red through the style.backgroundColor method. The second listener is mouseout, which represents the event triggered when the mouse pointer leaves the element. When the event fires, we can reset the background color to white.

The effect of this code is that when the mouse pointer hovers over the div element, its background color turns red, and when the mouse pointer leaves, the background color returns to white.

Step 3: Call the JavaScript code

Finally, you need to connect the JavaScript code to the HTML page to make the hover function take effect. JavaScript code can be called by:

Related knowledge
What is useEffect? How do you use it to perform side effects? What is useEffect? How do you use it to perform side effects? Mar 19, 2025 pm 03:58 PM

The article discusses useEffect in React, a hook for managing side effects like data fetching and DOM manipulation in functional components. It explains usage, common side effects, and cleanup to prevent issues like memory leaks.

Explain the concept of lazy loading. Explain the concept of lazy loading. Mar 13, 2025 pm 07:47 PM

Lazy loading delays loading of content until needed, improving web performance and user experience by reducing initial load times and server load.

What are higher-order functions in JavaScript, and how can they be used to write more concise and reusable code? What are higher-order functions in JavaScript, and how can they be used to write more concise and reusable code? Mar 18, 2025 pm 01:44 PM

Higher-order functions in JavaScript enhance code conciseness, reusability, modularity, and performance through abstraction, common patterns, and optimization techniques.

How does currying work in JavaScript, and what are its benefits? How does currying work in JavaScript, and what are its benefits? Mar 18, 2025 pm 01:45 PM

The article discusses currying in JavaScript, a technique transforming multi-argument functions into single-argument function sequences. It explores currying's implementation, benefits like partial application, and practical uses, enhancing code read

How does the React reconciliation algorithm work? How does the React reconciliation algorithm work? Mar 18, 2025 pm 01:58 PM

The article explains React's reconciliation algorithm, which efficiently updates the DOM by comparing Virtual DOM trees. It discusses performance benefits, optimization techniques, and impacts on user experience.Character count: 159

How do you prevent default behavior in event handlers? How do you prevent default behavior in event handlers? Mar 19, 2025 pm 04:10 PM

Article discusses preventing default behavior in event handlers using preventDefault() method, its benefits like enhanced user experience, and potential issues like accessibility concerns.

What is useContext? How do you use it to share state between components? What is useContext? How do you use it to share state between components? Mar 19, 2025 pm 03:59 PM

The article explains useContext in React, which simplifies state management by avoiding prop drilling. It discusses benefits like centralized state and performance improvements through reduced re-renders.

What are the advantages and disadvantages of controlled and uncontrolled components? What are the advantages and disadvantages of controlled and uncontrolled components? Mar 19, 2025 pm 04:16 PM

The article discusses the advantages and disadvantages of controlled and uncontrolled components in React, focusing on aspects like predictability, performance, and use cases. It advises on factors to consider when choosing between them.

See all articles