vue modifies the distance from the top of the page

In Vue development, sometimes we need to modify the distance the page scrolls to the top. For example, on a long page, when users scroll down a lot of content, we hope that when they return to the top of the page, they don't need to scroll so much, but go directly back to the top of the page, providing a better user experience. In this case, we need to modify the distance the page scrolls to the top. This article will introduce how to use Vue to implement this function.

For Vue development, to modify the scrolling distance to the top of the page, we can use the following two methods:

1. Change the scrolling distance through JavaScript code

Through JavaScript Code, we can control the distance the page scrolls to the top. The code is as follows:

// 回到页面顶部的方法
function backToTop() {
  let scrollToTop = window.setInterval(function() {
    let pos = window.pageYOffset;
    if ( pos > 0 ) {
      window.scrollTo( 0, pos - 20 );
    } else {
      window.clearInterval( scrollToTop );
    }
  }, 16);
}

The above code achieves the effect of scrolling to the top of the page. Among them, the current scrolling distance is obtained through window.pageYOffset, and the scrolling effect of the page is achieved through window.scrollTo(0, pos - 20). This method uses setInterval to fire continuously until the page scrolls to the top. You can adjust the distance of each scroll as needed. For example, in the above code, the distance of each scroll is 20px.

2. Use Vue instructions to achieve

For Vue development, we can use Vue instructions to modify the distance the page scrolls to the top. For example, we could create a directive that goes directly back to the top of the page.

First, create a file backToTop.js in your Vue project. In this file, define a Vue instruction to achieve the effect of scrolling the page to the top:

// backToTop.js
export const backToTop = {
  bind: function (el) {
    el.addEventListener('click', function() {
      let scrollToTop = window.setInterval(function() {
        let pos = window.pageYOffset;
        if ( pos > 0 ) {
          window.scrollTo( 0, pos - 20 );
        } else {
          window.clearInterval( scrollToTop );
        }
      }, 16);
    });
  },
  unbind: function (el) {
    el.removeEventListener('click');
  }
}

In the above code, we use the bind method of the Vue instruction to register a click event on the element. When the element is clicked , execute the code that returns to the top of the page. In this file, we also define the unbind method, which is used to unbind events and prevent memory leaks.

Next, use this instruction in the component:

<!-- MyComponent.vue -->
<template>
  <div>
    <button v-back-to-top>回到顶部</button>
    <!-- some content -->
  </div>
</template>

<script>
// 引入backToTop.js中定义的指令
import { backToTop } from './backToTop.js';

export default {
  directives: {
    'back-to-top': backToTop
  },
  // 组件其它属性和方法
}
</script>

With the above code, we can use the back-to-top instruction in the component. When the user clicks on the element, the page will Scroll to top.

Summary

This article introduces two methods to modify the distance between the Vue page scrolling to the top, one is implemented through JavaScript code, and the other is implemented through Vue instructions. Vue directives can make code easier to read and maintain, and can be integrated into Vue components. No matter which approach you take, you can provide your users with a better browsing experience.

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