How to use Vue to implement scrolling listening effects

How to use Vue to implement scrolling listening effects

Introduction:
Scrolling listening is one of the commonly used special effects in web development. It allows us to scroll the page when we scroll. , triggering corresponding animation, loading data or other interactive behaviors based on the scroll position. As a popular JavaScript framework, Vue provides a wealth of tools and functions that can help us implement scrolling monitoring effects. In this article, we will learn how to use Vue to implement scrolling listening effects and provide detailed code examples.

Step 1: Create Vue projects and components

First, we need to create a Vue project and create a component in it to implement scrolling listening effects. You can use Vue CLI to quickly build a Vue project. The command is as follows:

$ vue create scroll-listen-demo

After the creation is successful, enter the project directory and install the relevant dependencies:

$ cd scroll-listen-demo
$ npm install

Then, create a project named ScrollListen component file ScrollListen.vue, and write the basic code in it:

<template>
  <div class="scroll-listen">
    <!-- 在此处编写滚动监听特效的HTML代码 -->
  </div>
</template>

<script>
export default {
  name: 'ScrollListen',
  data() {
    return {
      // 在此处定义状态等等
    }
  },
  mounted() {
    // 在此处编写滚动监听特效的代码
  },
}
</script>

<style scoped>
.scroll-listen {
  // 在此处编写滚动监听特效的样式
}
</style>

Step 2: Use the vue-scrollama library to implement scrolling listening

In order to simplify scrolling monitoring For implementation, we can use the vue-scrollama library. Execute the following command in the terminal to install:

$ npm install vue-scrollama

After the installation is completed, introduce the relevant code of vue-scrollama into the ScrollListen.vue component:

<template>
  <div class="scroll-listen">
    <div
      v-for="(section, index) in sections"
      :key="index"
      class="section"
    >
      <h2>{{ section.title }}</h2>
      <p>{{ section.content }}</p>
    </div>
  </div>
</template>

<script>
import { Scrollama, Step } from 'vue-scrollama';

export default {
  name: 'ScrollListen',
  components: {
    Scrollama,
    Step,
  },
  data() {
    return {
      sections: [
        { title: 'Section 1', content: 'Section 1 Content' },
        { title: 'Section 2', content: 'Section 2 Content' },
        { title: 'Section 3', content: 'Section 3 Content' },
      ],
    };
  },
  mounted() {
    // 在此处编写滚动监听特效的代码
  },
}
</script>

<style scoped>
.scroll-listen {
  // 在此处编写滚动监听特效的样式
}

.section {
  height: 100vh;
}
</style>

Next, we need to write the scroll monitoring code in the mounted life cycle hook. First, introduce the Scrollama component and initialize the Scrollama instance in the mounted method:

import { Scrollama, Step } from 'vue-scrollama';

export default {
  // ...
  mounted() {
    this.initScrollama();
  },
  methods: {
    initScrollama() {
      const scroller = new Scrollama();

      scroller
        .onStepEnter(({ index }) => {
          // 在这里触发滚动进入某个步骤后的动作
        })
        .onStepExit(({ index }) => {
          // 在这里触发滚动离开某个步骤后的动作
        })
        .setup({
          step: '.section',
        });
    },
  },
}

in the initScrollama method , we created a Scrollama instance and specified the callback functions when scrolling in and out through the onStepEnter and onStepExit methods. You can write corresponding logic in these two callback functions according to actual needs, such as displaying animations, loading data, etc.

Step 3: Use scrolling listening effects

The specific implementation steps of the scrolling listening effects have been completed. Now we can use the scrolling listening effects in the ScrollListen.vue component. Add more sections in the sections array and add the class name section on each section element:

<template>
  <div class="scroll-listen">
    <div
      v-for="(section, index) in sections"
      :key="index"
      class="section"
    >
      <h2>{{ section.title }}</h2>
      <p>{{ section.content }}</p>
    </div>
  </div>
</template>

<script>
// ...
  data() {
    return {
      sections: [
        { title: 'Section 1', content: 'Section 1 Content' },
        { title: 'Section 2', content: 'Section 2 Content' },
        { title: 'Section 3', content: 'Section 3 Content' },
        // 可以继续添加更多的section
      ],
    };
  },
// ...
</script>

Next, We can write the corresponding logic in the onStepEnter and onStepExit callback functions. For example, in the onStepEnter callback function, we can modify the style of a section based on the value of index to achieve animation effects:

// ...
  methods: {
    // ...
    initScrollama() {
      const scroller = new Scrollama();

      scroller
        .onStepEnter(({ index }) => {
          const activeSection = document.querySelectorAll('.section')[index];
          activeSection.style.backgroundColor = 'red'; // 修改背景色为红色
        })
        .onStepExit(({ index }) => {
          const activeSection = document.querySelectorAll('.section')[index];
          activeSection.style.backgroundColor = ''; // 恢复背景色
        })
        .setup({
          step: '.section',
        });
    },
  },
// ...
</script>

In this way, we can trigger corresponding animations, style changes or other interactive behaviors based on the scroll position.

Summary:
In this article, we learned how to use Vue to implement scrolling listening effects. By using the vue-scrollama library, we can simplify the implementation process of scroll monitoring and implement scroll entry and scroll exit by writing onStepEnter and onStepExit callback functions. Actions. I hope this article will be helpful for you to learn Vue to implement scrolling listening effects. If you have any questions, please feel free to leave a message.

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