A Complete Guide to Implementing Infinite Scroll Loading with Vue.js

As the amount of data continues to increase, scrolling loading of web pages has gradually become an important part of the user experience. In this post, we will discuss a complete guide on how to implement infinite scroll loading using Vue.js.

What is infinite scroll loading?

Infinite scroll loading, also known as infinite scroll, is a web design technique used to add more content as the user scrolls to the bottom of the page. This technology is commonly used on blogs, social media, online stores and other websites that need to display content dynamically.

Infinite scrolling is different from paging. In traditional paging, users must turn pages to load the content of the next page. In infinite scrolling, the page will automatically load the content of the next page, and users can continue to browse the list without turning pages.

What is Vue.js?

Vue.js is a lightweight JavaScript framework for building user interfaces. It has good scalability and maintainability, and is easy to integrate into existing projects. Vue.js provides many useful features, such as two-way data binding, componentized architecture, and virtual DOM, making developing web applications faster and easier.

Now, we start to explore how to use Vue.js to achieve infinite scroll loading.

Step 1: Prepare the project

First, we need to set up the Vue.js project through Node.js and npm. Then, create a Vue.js component to display our list items.

Install Vue.js and prepare the project:

npm install -g vue-cli
vue init webpack my-project
cd my-project
npm install

Create components:

You can use the following command to create components:

vue generate component List

Step 2: Implementation Infinite Scroll

Here’s the most important part: how to achieve infinite scroll.

Suppose we have an API that requires pagination, and it returns one page of data and the URL address of the next page.

To achieve infinite scrolling, we need to load the next page of data until no more data is available or the user stops scrolling the page. We can use Vue.js' watch API to listen for scroll events and trigger an event to load the next page when scrolling to the bottom of the page.

In the component we created previously, add the following code:

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

<script>
export default {
  data() {
    return {
      items: [],
      nextUrl: "https://api.example.com/page1"
    };
  },
  watch: {
    $route(to, from) {
      window.addEventListener("scroll", this.handleScroll);
    }
  },
  methods: {
    async loadMore() {
      const response = await fetch(this.nextUrl);
      const data = await response.json();
      this.items = [...this.items, ...data.items];
      this.nextUrl = data.nextUrl;
    },
    handleScroll() {
      if (
        window.innerHeight + window.pageYOffset >=
        document.body.offsetHeight
      ) {
        this.loadMore();
      }
    }
  },
  mounted() {
    window.addEventListener("scroll", this.handleScroll);
  },
  destroyed() {
    window.removeEventListener("scroll", this.handleScroll);
  }
};
</script>

We first defined two data items: items and nextUrl, items is used to store the loaded list items, and nextUrl is used to store the URL address of the next page.

In the mounted life cycle hook, we bind the handleScroll method to the scroll event.

We used the watch API to listen for route change events, here to rebind the scroll event when the component is reused.

loadMore method is used to load the data of the next page. We use the fetch API to get the data and add it to the items array. The handleScroll method is used to check the scroll event. When the page scrolls to the bottom, the loadMore method is called to load the data of the next page.

Finally, we release the monitoring of scroll events when the component is destroyed.

Now, we have completed the implementation of infinite scrolling. Whenever the user scrolls to the bottom of the page, the data for the next page loads automatically.

Step 3: Add loading prompts and error prompts

Better user experience usually requires adding a loading prompt at the end of the list, and also needs to display an error prompt when an error occurs.

Add the following code in the previous component:

<template>
  <div>
    <ul>
      <li v-for="item in items" :key="item.id">{{ item.name }}</li>
    </ul>
    <div v-if="isLoading">Loading...</div>
    <div v-if="errorMessage">{{ errorMessage }}</div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      items: [],
      nextUrl: "https://api.example.com/page1",
      isLoading: false,
      errorMessage: null
    };
  },
  watch: {
    $route(to, from) {
      window.addEventListener("scroll", this.handleScroll);
    }
  },
  methods: {
    async loadMore() {
      try {
        this.isLoading = true;
        const response = await fetch(this.nextUrl);
        const data = await response.json();
        this.items = [...this.items, ...data.items];
        this.nextUrl = data.nextUrl;
      } catch (error) {
        this.errorMessage = "Something went wrong." + error.message;
      } finally {
        this.isLoading = false;
      }
    },
    handleScroll() {
      if (
        window.innerHeight + window.pageYOffset >=
        document.body.offsetHeight
      ) {
        this.loadMore();
      }
    }
  },
  mounted() {
    window.addEventListener("scroll", this.handleScroll);
  },
  destroyed() {
    window.removeEventListener("scroll", this.handleScroll);
  }
};
</script>

We added two data items isLoading and errorMessage, which are used to display the loading respectively. Hints and error messages. In the loadMore method, we add a try-catch block to catch errors that may occur when data is loaded, and close the loading prompt in the finally block. Display the error message in errorMessage.

Now, we have completed an infinite scrolling list with loading prompts and error prompts.

Conclusion

In this article, we learned how to use Vue.js to implement infinite scrolling loading list. We learned about important technologies such as monitoring scroll events, dynamically loading data, display loading and error prompts.

When implementing infinite scrolling, we need to be careful not to load too much data at once, which will cause performance degradation. We should also provide users with appropriate loading prompts and error prompts to improve user experience.

Of course, this is just a simple example. Vue.js provides more functions and APIs, allowing us to create more complex components and applications. Hope this article can be helpful to you.

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