How to implement the automatic scrolling effect of hidden marquee when text is too long in Vue

In recent years, with the continuous development of front-end technology, various novel and practical special effects have emerged in endlessly. Among them, a special effect of text scrolling - marquee, also known as automatic scrolling, is gradually becoming one of the common functions in many websites and applications.

Among front-end frameworks, Vue.js is a very popular choice. This article will introduce how to achieve the automatic scrolling effect of hiding the marquee when the text is too long in Vue.

1. Basic Principle

The principle of the marquee effect is very simple: place the text in a fixed container. When the length of the text exceeds the length limit of the container, the text container is set to Positioning mode uses animation to keep text moving to the left to achieve a marquee effect.

When realizing the marquee effect, we need to do the following:

1. Control the height and width of the text container through CSS to ensure uniform and beautiful styles;
2. Set the overflow hidden attribute of the text container to prevent the text from overflowing;
3. Wrap a layer of elements that wrap the text, and let its position change continuously through animation, thereby achieving the effect of automatic scrolling of the text;

2. Specific implementation

1. First define two containers in HTML, namely a container for displaying text and a container for wrapping text.

<div class="scroll-container">
  <div class="text-container">
    这是需要被滚动的内容
  </div>
</div>

2. Then, set the text container to absolute positioning in CSS, and set the width, height, and overflow hidden properties.

.scroll-container {
  position: relative;
  height: 50px;
  overflow: hidden;
}

.text-container {
  position: absolute;
  left: 0;
  top: 0;
  white-space: nowrap;
}

In the above CSS, we set the text container to be absolutely positioned and place it in the upper left corner of the parent container. At the same time, the width of the text container is set to 100%, the height is 50px, and the overflow attribute is set to "hidden", which means that when the content in the container is too long, the excess part will be hidden.

3. Next, we need to use vue.js to achieve animation effects. In the Vue.js template, we add a "transition" attribute to the container that wraps the text, and set the animation effect from "left" to "-100%".

<template>
  <div class="scroll-container">
    <div class="text-container" :style="{left: position + &#39;%&#39;}">
      这是需要被滚动的内容
    </div>
  </div>
</template>

<style>
.scroll-container {
  position: relative;
  height: 50px;
  overflow: hidden;
}

.text-container {
  position: absolute;
  left: 0;
  top: 0;
  white-space: nowrap;
  transition: left 5s linear;
}
</style>

<script>
export default {
  data () {
    return {
      position: 0
    }
  },
  mounted () {
    setInterval(() => {
      this.position -= 100;
      if (this.position < -100) {
        this.position = 0;
      }
    }, 5000)
  }
}
</script>

In the above code, we use vue.js to achieve animation effects. Through the setInterval timer, the "position" attribute value is subtracted by 100 every 5 seconds to achieve the effect of automatic text scrolling. At the same time, when the marquee scrolls to the far left, the "position" attribute value is reset to 0, realizing the infinite loop scrolling function of text.

3. Summary

The effect of hiding the automatic scrolling of the ticker if the text is too long has become more and more common in today's websites and applications. Through the implementation of the Vue.js framework, we can not only implement this function quickly and conveniently, but also present the text content in the web page to users in a beautiful and smooth form. I hope this article will be helpful in using Vue to achieve the automatic scrolling effect of hiding the marquee when the text is too long.

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