How to realize the small dot jump in the web front-end image (a brief analysis of the method)

With the rapid development of the Internet and the increasing needs of users, the web front-end is gradually becoming an indispensable and important part of people's work and life. In the process of web front-end development, image jump is one of the common requirements, and small dots can achieve a more beautiful and easy-to-use page effect. This article will introduce in detail the basic principles, implementation methods and usage effects of jumping small dots in web front-end images.

Basic Principle

In web front-end development, image jump is a basic application. Normally, we will place an image in a link tag , so that clicking on the image will jump to the specified page. Small dots are generally used to indicate the location of the current page, or as navigation markers. The implementation principle mainly relies on the synergy of three technical aspects: HTML, CSS and JS, which will be introduced in detail below.

Implementation method

Before implementing the image jumping dots, we need to first combine the images that need to be jumped and add them to a tag , as shown below:

<a href="...">
  <img src="..." alt="...">
</a>

Among them, the href attribute is used to specify the target address of the jump link, and the img tag contains the image that needs to be jumped. In order to achieve the effect of small dots, the following style code needs to be added to the page:

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #eee;
  display: inline-block;
  margin-right: 10px;
}

The above CSS style code will define a small round dot with a size of 8px and match it with other elements. interval. Next, we need to use JS code to achieve the dynamic effect of the small dots.

const dots = document.querySelectorAll('.dot');
const activeDot = index => {
  for(let i=0; i<dots.length; i++){
    dots[i].classList.remove('active');
  }
  dots[index].classList.add('active');
}

The above JS code will use the querySelectorAll method to select the small dot elements that have been added to the page, and use ClassList to control its addition or deletion of the active attribute, thereby achieving the dynamic effect of the small dots.

Using effects

Through the implementation of the above steps, we have successfully combined the image jump and the small dot effect. In practical applications, we can usually combine these two effects into a whole to achieve a more excellent, concise and practical page effect. Specifically, we can combine multiple jump images and corresponding small dot effects into a carousel image, and control its automatic or manual scrolling through JS to provide users with a smoother and more beautiful experience.

Summary

This article introduces in detail the basic principles, implementation methods and usage effects of jumping small dots in web front-end images. Through the collaborative use of HTML, CSS and JS technologies, we can achieve more outstanding, beautiful and efficient web front-end effects, and bring a better user experience to users.

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