Utilizing Media Queries with Dynamic Vue Properties

Question

Utilizing Media Queries with Dynamic Vue Properties

On one of my website pages, I always have a Div element with a Background Image that changes based on Media Queries (for example, I fetch a smaller resolution from my CDN on mobile phones).

However, since I retrieve the Image URL on Page Load, I need to set it in CSS. This would work fine for a computed Style property, but those do not support Media Queries.

So far, the only solution I have found is using a Resize Event Listener, but I would prefer a cleaner solution.

Here is an example of how it looks in CSS with a predefined URL:

/* Custom, iPhone Retina */ 
@media only screen and (min-width : 320px) {
  .image {
        background: linear-gradient(rgba(255, 255, 255, 0.0), rgba(0, 0, 0, 0.95)), url("https://res.cloudinary.com/.../image/upload/c_scale,w_900/v.../3.jpg") no-repeat center;
        background: -webkit-linear-gradient(rgba(255, 255, 255, 0.0), rgba(0, 0, 0, 0.95)), url("https://res.cloudinary.com/.../image/upload/c_scale,w_900/v.../3.jpg") no-repeat center;
      }
  }

/* Extra Small Devices, Phones */ 
@media only screen and (min-width : 480px) {
  .image {
        background: linear-gradient(rgba(255, 255, 255, 0.0), rgba(0, 0, 0, 0.95)), url("https://res.cloudinary.com/.../image/upload/c_scale,w_1300/v.../3.jpg") no-repeat center;
        background: -webkit-linear-gradient(rgba(255, 255, 255, 0.0), rgba(0, 0, 0, 0.95)), url("https://res.cloudinary.com/.../image/upload/c_scale,w_1300/v.../3.jp"") no-repeat center;
      }
  }

javascript css vue.js vuejs2

Answer 1

Answer №1

An effective solution that comes to mind is to store the window width when the page loads and then dynamically add a class based on that value. Check out more information on this link.

data() {
   return {
      deviceWidth: 0
   }
}

Assign the window width on component mount

created() {
   this.deviceWidth = window.innerWidth;
}

Then in your template

// manage different screen sizes
<element 
   :class="{'image-ios': deviceWidth < 480, 'image-small': deviceWidth >= 480}"></element>

It's important to note that you won't require a resize listener since the screen width at the time of loading will be sufficient for most scenarios, especially on mobile devices.

Answer 2

An effective solution that comes to mind is to store the window width when the page loads and then dynamically add a class based on that value. Check out more information on this link.

data() {
   return {
      deviceWidth: 0
   }
}

Assign the window width on component mount

created() {
   this.deviceWidth = window.innerWidth;
}

Then in your template

// manage different screen sizes
<element 
   :class="{'image-ios': deviceWidth < 480, 'image-small': deviceWidth >= 480}"></element>

It's important to note that you won't require a resize listener since the screen width at the time of loading will be sufficient for most scenarios, especially on mobile devices.

Answer 3

Answer №2

Make sure to include your assets in the build output. Utilize Webpack to handle path creation dynamically instead of hardcoding them.

If that's not feasible, consider using CSS image-set for defining responsive images beyond media queries. Keep in mind, though, that browser support may be limited.

Alternatively, leverage the srcset attribute in HTML and show/hide the element based on media queries.

-- Edit:

Don't forget that you can bind styles directly in the VUE.js template using v-bind:style. Check out an example here. This updates the style block compiled during build rather than creating inline "computed" styles.

-- Edit #2

Try using VUE to set a CSS Variable like --backgroundImage, which can then be utilized within media queries in your CSS. Check out a helpful Codepen example.

CSS

:root {
  --backgroundImage: 'blank.png';
}

div {
  background-image: var(--backgroundImage);
}

VUE

watch: {
    img(val){
    element.style.setProperty('--backgroundImage', val)
    }
}

Answer 4

Make sure to include your assets in the build output. Utilize Webpack to handle path creation dynamically instead of hardcoding them.

If that's not feasible, consider using CSS image-set for defining responsive images beyond media queries. Keep in mind, though, that browser support may be limited.

Alternatively, leverage the srcset attribute in HTML and show/hide the element based on media queries.

-- Edit:

Don't forget that you can bind styles directly in the VUE.js template using v-bind:style. Check out an example here. This updates the style block compiled during build rather than creating inline "computed" styles.

-- Edit #2

Try using VUE to set a CSS Variable like --backgroundImage, which can then be utilized within media queries in your CSS. Check out a helpful Codepen example.

CSS

:root {
  --backgroundImage: 'blank.png';
}

div {
  background-image: var(--backgroundImage);
}

VUE

watch: {
    img(val){
    element.style.setProperty('--backgroundImage', val)
    }
}

Answer 5

Answer №3

To manage the desired value, utilize the matchMedia function. This enables browser engineers to enhance screen resize calculations effectively.

<script setup>
import { ref, computed, onUnmounted, onMounted} from "vue";

const mediaQuery = window.matchMedia('(min-width : 480px)');
const isScreenLarge = ref(mediaQuery.matches)

const update = (event) => (isScreenLarge.value = event.matches);
onMounted(() => mediaQuery.addEventListener("change", update));
onUnmounted(() => mediaQuery.removeEventListener("change", update));

const background = computed(() => isScreenLarge.value ? 'large.jpg' : 'small.jpg';
</script>

<template>
<div>some content</div>
</template>

<style scoped>
div {
  background: v-bind(background);
}
</style>

For more flexibility, consider constructing a composable to handle this task in various sections of your application.

Answer 6

To manage the desired value, utilize the matchMedia function. This enables browser engineers to enhance screen resize calculations effectively.

<script setup>
import { ref, computed, onUnmounted, onMounted} from "vue";

const mediaQuery = window.matchMedia('(min-width : 480px)');
const isScreenLarge = ref(mediaQuery.matches)

const update = (event) => (isScreenLarge.value = event.matches);
onMounted(() => mediaQuery.addEventListener("change", update));
onUnmounted(() => mediaQuery.removeEventListener("change", update));

const background = computed(() => isScreenLarge.value ? 'large.jpg' : 'small.jpg';
</script>

<template>
<div>some content</div>
</template>

<style scoped>
div {
  background: v-bind(background);
}
</style>

For more flexibility, consider constructing a composable to handle this task in various sections of your application.

Utilizing Media Queries with Dynamic Vue Properties

Answer №1

Answer №2

Answer №3

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