How to cancel vue upper and lower blur

In Vue.js, sometimes we will create a scroll view, and you may find some strange effects in the scroll view. One of them is the up and down blur effect. This effect makes your scroll view appear to fade in and out.

But sometimes, you may want to cancel this effect. Because this effect is sometimes not very good-looking and may confuse users. In this article, we will introduce how to cancel the upper and lower blur effects of Vue.

First method: Cancel the scroll rebound effect

The default scrolling behavior of Vue.js will give your scroll view a elastic effect. When you scroll to the bottom or top, the scroll view will return some distance. This behavior is the scroll rebound effect. If you want to cancel the upper and lower blur effects, you can do so by canceling the scroll rebound effect.

You can introduce the following code in the mounted life cycle hook of the component:

mounted () {
  const container = this.$refs.container;
  container.addEventListener('touchmove', this.preventScroll, { passive: false });
  container.addEventListener('touchend', this.allowScroll, { passive: false });
},
methods: {
  preventScroll (event) {
    event.preventDefault();
  },
  allowScroll () {
    const container = this.$refs.container;
    const scrollTop = container.scrollTop;
    const scrollHeight = container.scrollHeight;
    const height = container.clientHeight;
    const maxScroll = scrollHeight - height;
    if (scrollTop === 0 || scrollTop === maxScroll) {
      container.removeEventListener('touchmove', this.preventScroll);
    }
  }
}

The above code will cancel the scroll rebound effect, and it will also handle scrolling to the top and the situation at the bottom. This method will not work if overflow: hidden is set in your scroll view.

Second method: Use some CSS techniques

If you don’t want to disable the scroll rebound effect, then you can use some CSS techniques to cancel Vue’s upper and lower blur effects.

You can add the following code to your component style sheet:

::-webkit-scrollbar {
  width: 0 !important;
  height: 0 !important;
}

The above code is for Webkit-based browsers (such as Chrome or Safari), which will hide the scroll bar and cancel Up and down blur effect. If you want to support other types of browsers (such as Firefox), you can use the following code:

* {
  scrollbar-width: none !important;
}

The above code will hide the scrollbar in all elements. However, it should be noted that this method will cancel both the horizontal and vertical scroll bars.

Third method: Use custom directives

There is a custom directive feature in Vue.js that allows us to add complex event processing logic to HTML elements. We can use this feature to cancel the upper and lower blur effects.

Add the following custom directives in the code:

Vue.directive('disable-scroll', {
  inserted: function (el) {
    el.addEventListener('touchmove', function(e) {
      e.preventDefault();
    }, { passive: false });
  }
});

The above code will disable the default behavior of scroll events. You can add the v-disable-scroll directive to your HTML element to disable scrolling up and down.

Summary

The above are three methods to cancel the upper and lower blur effects of Vue. These methods allow you to achieve a more user-friendly interactive experience in Vue.js applications. Depending on your specific needs, you can choose which method to achieve your goal. Hope this article helps you!

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