How to handle the monitoring and processing of scroll events in Vue components

How to handle the monitoring and processing of scrolling events in Vue components

In the development of Vue, we often encounter scenarios where we need to monitor and process scrolling events, such as implementing Rolling loading, infinite scrolling and other functions. This article will introduce in detail how to handle the monitoring and processing of scroll events in Vue components, and provide specific code examples.

1. Listening to scrolling events

There are two ways to listen to scrolling events in Vue components: one is by adding an event listener, and the other is by using a third-party plug-in.

(1) Add event listener

In the mounted hook function of the Vue component, you can listen to the scrolling event through the addEventListener method. The following is a sample code:

mounted() {
  window.addEventListener('scroll', this.handleScroll)
},
methods: {
  handleScroll() {
    // 处理滚动事件的代码
  }
},
beforeDestroy() {
  window.removeEventListener('scroll', this.handleScroll)
}

In the above code, after the component rendering is completed, add a scroll event listener on the window object, and bind the event handler function handleScroll to the methods of the current Vue instance.

You also need to remove the event listener through the removeEventListener method before the component is destroyed to avoid memory leaks.

(2) Using third-party plug-ins

In addition to manually adding listeners, Vue also supports the use of third-party plug-ins to handle scroll events. The more commonly used plug-ins include vue-scroll, vue-infinite-scroll, etc.

Take the vue-infinite-scroll plug-in as an example. The following is a sample code:

<template>
  <div v-infinite-scroll="loadMore" infinite-scroll-disabled="busy" infinite-scroll-distance="10">
    <!-- 内容区域 -->
  </div>
</template>

<script>
import InfiniteScroll from 'vue-infinite-scroll';

export default {
  data() {
    return {
      busy: false
    }
  },
  methods: {
    loadMore() {
      if (!this.busy) {
        // 处理滚动事件的代码
      }
    }
  },
  directives: { InfiniteScroll }
}
</script>

In the above code, the vue-infinite-scroll plug-in is introduced and v-infinite is used in the component. -scroll directive to listen for scroll events. At the same time, you can also use the infinite-scroll-disabled attribute to set whether to disable the triggering of scroll events, and the infinite-scroll-distance attribute to set the critical value that triggers more loading.

2. Handling scroll events

In the processing of scroll events, a common requirement is to determine whether the scroll has reached the bottom and trigger related operations. The following is a sample code for handling scroll loading:

loadMore() {
  const scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
  const clientHeight = document.documentElement.clientHeight || document.body.clientHeight;
  const scrollHeight = document.documentElement.scrollHeight || document.body.scrollHeight;

  if (scrollTop + clientHeight + 10 >= scrollHeight && !this.busy) {
    // 处理滚动加载操作
    this.getData();
  }
},
getData() {
  this.busy = true;

  // 发送请求获取数据
  axios.get('http://example.com/api/data').then(response => {
    // 处理获取的数据
    this.dataList.push(response.data);

    this.busy = false;
  }).catch(error => {
    console.error(error);
    this.busy = false;
  });
}

In the above code, by obtaining the scrollTop, clientHeight and scrollHeight of the scroll area, it is determined that when the scroll reaches the bottom, more operations are triggered to load. In the getData method, you can initiate an asynchronous request to obtain data and append the data to the existing data list. It should be noted that during sending the request, the busy flag needs to be set to true to avoid triggering the rolling loading operation repeatedly.

Summary:

This article introduces how to handle the monitoring and processing of scroll events in Vue components. By manually adding event listeners or using third-party plug-ins, you can monitor and process scroll events. In scroll event processing, common requirements include determining that the scroll has reached the bottom and triggering related operations. The above is a simple rolling loading example, which you can modify and expand according to actual needs.

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