How to implement infinite scrolling list in Vue

How to implement infinite scrolling lists in Vue

Introduction:
Infinite scrolling lists are very common in modern web applications, and they can make long lists appear more smoothly. , automatically loads more data as the user scrolls to the bottom. Implementing an infinite scrolling list in Vue is not complicated. This article will introduce an implementation method to help you easily implement an infinite scrolling list.

Implementation idea:
The basic idea of ​​implementing an infinite scrolling list is to listen for scrolling events and trigger the operation of loading more data when scrolling to the bottom of the list. In Vue, we can directly use Vue's instruction (v-scroll) to listen for scroll events and use some specific logic controls to determine whether the bottom of the list has been reached.

The specific steps are as follows:

1. Create a list component:
   First, we need to create a list component to display data. In this example, we use a simple ul element to create a vertical list:

<template>
  <ul class="list">
    <li v-for="item in items" :key="item.id">{{ item.name }}</li>
  </ul>
</template>

<script>
export default {
  data() {
    return {
      items: [], // 数据列表
    };
  },
  mounted() {
    // 初始化数据
    this.fetchData();
  },
  methods: {
    fetchData() {
      // 模拟异步获取数据
      setTimeout(() => {
        const newItems = // 模拟异步获取的新数据
        this.items.push(...newItems);
      }, 1000);
    },
  },
};
</script>

<style>
.list {
  /* 列表样式 */
}
</style>

2. Add a scroll listener:
   Next, we need to add a scroll listener to the list component , triggering logic to load more data when scrolling to the bottom. In Vue, we can use Vue's instructions (v-scroll) to listen for scroll events:

<template>
  <ul class="list" v-scroll="onScroll">
    <!-- ... -->
  </ul>
</template>

3. Implement the logic of scrolling to the bottom:
   In the scroll event callback, we You need to implement the logic to determine whether you have scrolled to the bottom of the list. A common judgment method is to judge whether the scroll bar scrolling distance is close to the bottom of the scroll container. If it is close to the bottom, trigger the operation of loading more data.

In Vue, we can use the clientHeight, scrollTop and scrollHeight properties to calculate the position of the scroll bar. Among them, clientHeight represents the visible height of the scroll container, scrollTop represents the scrolling distance of the scroll bar, and scrollHeight represents the total height of the scroll container.

<template>
  <ul class="list" v-scroll="onScroll" ref="list">
    <!-- ... -->
  </ul>
</template>

<script>
export default {
  // ...
  methods: {
    onScroll() {
      // 滚动容器
      const list = this.$refs.list;

      // 判断是否滚动到底部
      if (list.scrollTop + list.clientHeight >= list.scrollHeight) {
        this.fetchData();
      }
    },
  },
};
</script>

4. Preloading mechanism:
   In order to improve performance, we can load more data in advance when scrolling to the bottom to provide a smoother user experience. A common practice is to trigger loading data when a certain distance from the bottom.

<template>
  <ul class="list" v-scroll="onScroll" ref="list">
    <!-- ... -->
  </ul>
</template>

<script>
export default {
  // ...
  methods: {
    onScroll() {
      // 滚动容器
      const list = this.$refs.list;

      // 判断是否接近底部
      if (list.scrollTop + list.clientHeight >= list.scrollHeight - 100) {
        this.fetchData();
      }
    },
  },
};
</script>

Conclusion:
Through the above steps, we successfully implemented a simple infinite scrolling list in Vue. Although this article only provides one implementation idea, there are actually many other implementation methods, and you can make appropriate modifications and optimizations according to your own needs. I hope this article will help you understand how to implement infinite scrolling lists in Vue. Comments and suggestions are welcome to learn and make progress together.

References:

• Vue.js official documentation: https://cn.vuejs.org/
• Vue v-scroll instruction documentation: https:/ /v1.vuejs.org/guide/custom-directive.html#Scrolling

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