How to use JavaScript to implement infinite scrolling?

How to use JavaScript to implement infinite scrolling page turning function?

Infinite scrolling has become very popular in modern website design. This feature helps users scroll the page to load new content without having to click the page button. In this article, we will introduce how to use JavaScript to implement infinite scrolling and provide specific code examples.

To implement infinite scrolling page turning function, we need to listen to user scroll events and load new content when the page scrolls to a specific position. The following are the steps to implement this function:

1. Create HTML structure

First, we need to create a container with content to display the new content we loaded. Assume that the id of this container is "content". Inside this container, we can place any type of content, such as articles, pictures, videos, etc. At the same time, a loading prompt element needs to be added at the bottom of the page to prompt the user that the content is loading. Assume that the id of this loading prompt element is "loading".

2. Listen to scroll events

Next, we need to listen to the user's scroll events. We can use JavaScript's scroll event to achieve this function. When the user scrolls the page, the browser will trigger the scroll event, and we can perform corresponding operations in the event callback function.

window.addEventListener("scroll", function() {
  // 在这里执行加载新内容的操作
});

3. Judge scrolling position

When the user scrolls the page, we need to determine whether the scrolling position meets the conditions for loading new content. Generally speaking, when you scroll to the bottom of the page, you can trigger the loading of new content.

window.addEventListener("scroll", function() {
  var content = document.getElementById("content");
  var loading = document.getElementById("loading");

  // 页面的整体高度
  var windowHeight = window.innerHeight;
  // 滚动条滚动的距离
  var scrollHeight = window.scrollY;
  // 内容容器的高度
  var contentHeight = content.clientHeight;
  // 加载提示元素距离页面顶部的距离
  var loadingOffsetTop = loading.offsetTop;

  // 判断是否滚动到页面底部
  if (windowHeight + scrollHeight >= contentHeight - loadingOffsetTop) {
    // 在这里执行加载新内容的操作
  }
});

4. Load new content

When scrolling to the bottom of the page, we can perform the operation of loading new content. Here we assume there is a loadMore function to load new content.

window.addEventListener("scroll", function() {
  var content = document.getElementById("content");
  var loading = document.getElementById("loading");

  var windowHeight = window.innerHeight;
  var scrollHeight = window.scrollY;
  var contentHeight = content.clientHeight;
  var loadingOffsetTop = loading.offsetTop;

  // 判断是否滚动到页面底部
  if (windowHeight + scrollHeight >= contentHeight - loadingOffsetTop) {
    loadMore();
  }
});

function loadMore() {
  // 在这里执行加载新内容的操作
}

In the loadMore function, you can use Ajax requests or other methods to load new content and add it to the "content" container.

Through the above steps, we can implement a basic infinite scrolling page turning function. When the user scrolls to the bottom of the page, new content is loaded without having to click a page turn button.

It should be noted that in order to improve performance and user experience, we can add some judgment conditions before loading new content, such as judging whether it is loading, whether there is new content to load, etc. In addition, we can also use throttling functions or anti-shake functions to reduce the frequency of scroll events to reduce unnecessary loading operations.

To sum up, the infinite scroll page turning function is one of the very common functions in modern website design. By listening to scroll events and loading new content based on the scroll position, we can provide users with a smoother browsing experience. Implementing this function using JavaScript is very simple and only requires a few lines of code. Hope this article is helpful to you!

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