How to make the requirement of unlimited loading of data at the bottom of the sliding page

This time I will bring you how to make the requirement of unlimited loading of data at the bottom of the scrolling page, and what are the precautions for how to infinitely load data at the bottom of the scrolling page. The following is a practical case, let's take a look.

I saw an article Implementing an Infinite Scroll with Vue.js and thought it was quite practical, so I read it and briefly translated it for reference for those who need it.

From this project you can Deepen the understanding of the life cycle of Vue, when to start axios request, how to use native js with Vue to write scroll events, etc. Here I mainly extract and supplement the key points of the original article

Technology of this article Key points

1. Vue life cycle

2. axios simple usage

3. moment.js format Change date

4. Lazy loading of pictures

5. Combined with native js to write scroll event

6. Request section Flow

Create project

First create a simple vue project

# vue init webpack-simple infinite-scroll-vuejs

Then install some plug-ins needed for the project

# npm install axios moment

Initialize user data

After the project is built, run it and take a look

# npm run dev

After opening http://localhost:8080 and it is correct, we Let’s start modifying the code. Let’s first look at obtaining user data.

<script>
import axios from 'axios'
import moment from 'moment'
export default {
 name: 'app',
 // 创建一个存放用户数据的数组
 data() {
  return {
   persons: []
  }
 },
 methods: {
  // axios请求接口获取数据
  getInitialUsers() {
   for (var i = 0; i < 5; i++) {
    axios.get(`https://randomuser.me/api/`).then(response => {
     this.persons.push(response.data.results[0])
    })
   }
  },
  formatDate(date) {
   if (date) {
    return moment(String(date)).format('MM/DD/YYYY')
   }
  },
 beforeMount() {
  // 在页面挂载前就发起请求
  this.getInitialUsers()
 }
}
</script>

The original author also specifically reminds us that it is completely unnecessary and not recommended to request 5 times when loading the page. However, this interface can only return 1 at a time. This is only done for testing. Of course, I can also simulate the data through Mock, so I won’t go into details~

Next, let’s write the template structure and style, as follows:

<template>
 <p id="app">
  <h1>Random User</h1>
  <p class="person" v-for="(person, index) in persons" :key="index">
   <p class="left">
    <img :src="person.picture.large" alt="">
   </p>
   <p class="right">
    <p>{{ person.name.first}} {{ person.name.last }}</p>
    <ul>
     <li>
      <strong>Birthday:</strong> {{ formatDate(person.dob)}}
     </li>
     <p class="text-capitalize">
      <strong>Location:</strong> {{ person.location.city}}, {{ person.location.state }}
     </p>
    </ul>
   </p>
  </p>
 </p>
</template>

<style lang="scss">
.person {
 background: #ccc;
 border-radius: 2px;
 width: 20%;
 margin: 0 auto 15px auto;
 padding: 15px;

 img {
  width: 100%;
  height: auto;
  border-radius: 2px;
 }

 p:first-child {
  text-transform: capitalize;
  font-size: 2rem;
  font-weight: 900;
 }

 .text-capitalize {
  text-transform: capitalize;
 }
}
</style>

In this way, the page can display the personal information of 5 people.

Processing infinite scroll loading logic

We need to add scroll() in methods next. Monitor scrolling, and this event should be within the life cycle of mounted(). The code is as follows:

<script>
 // ...
 methods: {
  // ...
  scroll(person) {
   let isLoading = false
   window.onscroll = () => {
    // 距离底部200px时加载一次
    let bottomOfWindow = document.documentElement.offsetHeight - document.documentElement.scrollTop - window.innerHeight <= 200
    if (bottomOfWindow && isLoading == false) {
     isLoading = true
     axios.get(`https://randomuser.me/api/`).then(response => {
      person.push(response.data.results[0])
      isLoading = false
     })
    }
   }
  }
 },
 mounted() {
  this.scroll(this.persons)
 }
}
</script>

The original text of this code has some spelling errors. I have corrected it here, and also increased the distance from the bottom. Start loading data and intercept the flow.

Save it, go back to the browser, and check the effect. There is no problem~

Summary

Scroll The function of infinite loading to the bottom of the page is implemented on Vue and is similar to ordinary page development. Each time the scrolling load is not completed, the next request will not be triggered. Each request is pushed into the array, through 's data binding implements lazy loading (actually 0 0 I don't really agree with it...). After reading it, it feels quite simple.

I believe you have mastered the method after reading the case in this article , for more exciting content, please pay attention to other related articles on the php Chinese website!

Recommended reading:

Detailed explanation of vue calculated properties and listener practical projects

How to make a pull-up on the mobile terminal Slide down to refresh loading

The above is the detailed content of How to make the requirement of unlimited loading of data at the bottom of the sliding page. For more information, please follow other related articles on the PHP Chinese website!