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feat: add useBackgroundImage composable #1248

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feat: add useBackgroundImage composable #1248

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shunnNet
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@shunnNet shunnNet commented Feb 14, 2024 •
edited

Add a useBackgroundImage composable to enable the background to use the same functionality as <nuxt-img>.

Usage

<script setup lang="ts">

  const cls = useBackgroundImage('/images/nuxt.png', {
    provider: 'ipx',
    sizes: '200,500:500,900:900',
    modifiers: {
      width: 300,
      height: 300,
      // others...
    },
    densities: "1x 2x",
    preload: true,
    nonce: 'any nonce',
  })
// insert a <style> in <head>
/*
  <style id="nuxt-bg-Btzvq1">
    .nuxt-bg-Btzvq1 {
      background-image: url(/_ipx/s_900x900/images/nuxt.png);
      background-image: image-set(
         url('/_ipx/s_900x900/images/nuxt.png') 1x, 
         url('/_ipx/s_1800x1800/images/nuxt.png') 2x
      );
    }

    @media (max-width: 900px) {
      .nuxt-bg-Btzvq1 {
        background-image: url(/_ipx/s_500x500/images/nuxt.png);
        background-image: image-set(
           url('/_ipx/s_500x500/images/nuxt.png') 1x,
           url('/_ipx/s_1000x1000/images/nuxt.png') 2x
        );
      }
    }

    @media (max-width: 500px) {
      .nuxt-bg-Btzvq1 {
        background-image: url(/_ipx/s_200x200/images/nuxt.png);
        background-image: image-set(
           url('/_ipx/s_200x200/images/nuxt.png') 1x, 
           url('/_ipx/s_400x400/images/nuxt.png') 2x
         );
      }
    }
  </style>

*/

</script>
<template>
  <div
    :class="cls"
    :style="{
      width: '300px',
      height: '300px',
      backgroundSize: 'cover',
      backgroundRepeat: 'no-repeat',
      backgroundPosition: 'center'
    }"
  />
</template>

@shunnNet
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Hello, I have added 3 new commits:

  • During SSR, because class names are randomly generated, it leads to duplicated insertion of style tags on both the server and client sides. Therefore, I attempted to fix this issue. Commit: bf2665d0
  • I initially thought there might be a similar duplication issue with preload, but it seems to occur only in dev mode. Therefore, I added a condition to check for this and removed that condition later.

@shunnNet
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shunnNet commented Mar 6, 2024

@danielroe
Hello, I am a newcomer participating in an open-source project. I would like to understand why this Pull Request has not received any response. Did I make any mistakes somewhere?

@danielroe
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My apologies for the slow review on this PR! I'm personally not sure this would be the right way to add this functionality. (Adding CSS generated in JS.)

Instead I think generating the image URL with useImage() and passing it in to a <style> block with a binding might be worth trying.

@shunnNet
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First of all, thank you for your response.

I believe I should first explain the rationale behind this PR:

nuxt-img encapsulates the functionalities of html <img> and <picture> into a simple interface, so intuitively, I thought it should have a similar solution for background-image as well. However, the fact is that the documentation only suggests users manually generate src and place them either in v-bind:style or in a v-bind within a style block. If users want functionality similar to the <NuxtImg> component, they have to write scripts themselves to generate different versions of the image and set CSS accordingly.

Therefore, the purpose of this PR is to make setting background-image as convenient as NuxtImg. I believe it would make the package more complete. I think v-bind cannot address this situation.

However, you mentioned uncertainty about whether "Adding CSS generated in JS." is a good approach. I would like to understand more about your concerns regarding this idea. Could you please elaborate on why this might not be the correct approach and what your concerns are?

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@shunnNet @danielroe