Vue realizes automatic full screen background

Vue is a popular JavaScript framework that helps developers build efficient user interfaces. When using Vue to build a page, it is inevitable that there will be some needs for full-screen background images. So, how to use Vue to achieve automatic full screen background? This article will share several implementation methods.

1. Use CSS

The most basic way to achieve a full-screen background image is to use CSS. You can use the CSS background-size property to stretch the image to the full screen size. The following code example adds a background image to the body element:

body {
  background-image: url("/path/to/image.jpg");
  background-size: cover;
}

Use the cover attribute to make the background image adapt to the screen size and maintain the aspect ratio of the image.

However, what we need to note is that if we have other content that needs to be displayed in the body element, then this method cannot meet our needs, because this will fix the size of the body element and in the content When the number of scroll bars increases, the background image will have a certain scaling ratio, which is not conducive to the user experience.

2. Use Vue directives

Vue directives can help us add specific functions to DOM elements. By using Vue instructions, we can easily implement full-screen background images and ensure the integrity of the layout. Vue directives have a bind hook function that is called when the directive is bound to an element. We can set the element bound to the instruction in this hook function.

The following code example shows how to use the Vue directive to bind a full-screen background image:

<template>
  <div v-full-screen-bg="/path/to/image.jpg">
    <h1 id="My-App-Title">My App Title</h1>
    <p>My App Content</p>
  </div>
</template>

<script>
export default {
  directives: {
    fullScreenBg: {
      bind: function (el, binding) {
        el.style.backgroundImage = 'url(' + binding.value + ')'
        el.style.backgroundSize = 'cover'
        el.style.backgroundRepeat = 'no-repeat'
        el.style.backgroundPosition = 'center center'
      }
    }
  }
}
</script>

In the above code, we created a directive fullScreenBg and bound it to a div on the elements. While binding, we set the value of the directive to the background image we need to use. When an instruction is bound to an element, its bind function will be called. We set the background of the element in the bind function to ensure that the background image can adapt to the full screen according to the element, and at the same time, other content in the element can be displayed normally. .

3. Use Vue components

Using Vue components can separate the functions and styles of the page and provide better reusability. We can create a full-screen background image component and reference it when needed.

The following code example shows how to use the Vue component to implement a full-screen background image:

<template>
  <div class="full-screen-bg" :style="{ backgroundImage: 'url(' + imageUrl + ')' }">
    <h1 id="My-App-Title">My App Title</h1>
    <p>My App Content</p>
  </div>
</template>

<script>
export default {
  props: {
    imageUrl: String
  }
}
</script>

<style scoped>
.full-screen-bg {
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center center;
}
</style>

In the above code, we created a full-screen background image component named FullScreenBg. In the component, we define a property named imageUrl through props to receive the path to the background image that needs to be used. At the same time, we apply the component's style to the element with class full-screen-bg, and use Vue's :style directive to dynamically bind the element's style attribute.

When using this component, we only need to introduce it where needed and pass the image path:

<template>
  <div>
    <full-screen-bg :image-url="/path/to/image.jpg"></full-screen-bg>
    <h1 id="My-App-Title">My App Title</h1>
    <p>My App Content</p>
  </div>
</template>

<script>
import FullScreenBg from '@/components/FullScreenBg.vue'

export default {
  components: {
    FullScreenBg
  }
}
</script>

In the above code, we introduced the FullScreenBg component and use it where needed Add the tag at the location and pass the image path to be used to the component.

Summary

The above three methods can all meet the needs of automatic full-screen background. The method of using CSS is simple, but it cannot meet the needs of page layout; the method of using Vue instructions can handle layout flexibly, but it requires adding specific instructions on elements that require full screen; the method of using Vue components can better separate styles and structure and provides better reusability.

Finally, we need to decide which method to use based on the actual scenario, as long as it meets the needs.

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