In Vue JS, assign a boolean value to a variable based on the screen width

Question

In Vue JS, assign a boolean value to a variable based on the screen width

Currently, I am working on a responsive navigation menu. I have completed the mobile view, but now I face an issue for the desktop view. I want to hide the button that toggles the mobile navbar and only display the navbar. However, the navbar is linked to a reactive variable using the "v-if" directive. How can I display the navbar in this scenario? I considered setting the variable true or false based on the screen size, but I cannot create a method due to the click event that also changes the variable value to toggle the menu on mobile screens. What would be the best approach to tackle this? Is there any way to remove the "v-if" on larger screens? Thank you for your assistance.

//reactive variable==========================
const showUserDropdown = ref(false)

//=================mobile toggle button=====================
<div class="pt-1 text-right">
    <button class="text-right md:hidden" @click="showDropdown = !showDropdown">
         <Icon :name="showDropdown ? 'up' : 'menu'" class="w-6 h-6 inline-block fill-cyan-800" />
    </button>
</div>
//====================mobile nav==================
nav class="" v-if="showDropdown">
   <ul class="">
       <li v-for="(item, index) in menu" :key="item.id" class="pb-2">
             <Link>
                 <Icon :name="item.icon_name" class="w-5 h-5 mr-2 inline fill-slate-500" />
                 <span class="capitalize"> {{ item.name }}</span>
             </Link>
       </li>
    </ul>
</nav>

Mobile View: ========================

Desktop View: =============================

javascript vue.js vue-composition-api

Answer 1

Answer №1

A more efficient way to update a variable based on screen width changes is by using matchMedia instead of constantly triggering a resize event.

<script setup>
const isMobile = ref('')
let mql

function handleMqlChange(e) {
  isMobile.value = e.matches
}

onMounted(() => {
  mql = window.matchMedia('(max-width: 1024px)')
  isMobile.value = mql.matches
  mql.addEventListener('change', handleMqlChange)
})

onUnmounted(() => {
  mql.removeEventListener('change', handleMqlChange)
})
</script>

To utilize this method, simply use v-if="isMobile". This will accurately reflect changes in screen size upon page load, as well as adjustments made by the user such as device orientation change or browser tab resizing.

Answer 2

A more efficient way to update a variable based on screen width changes is by using matchMedia instead of constantly triggering a resize event.

<script setup>
const isMobile = ref('')
let mql

function handleMqlChange(e) {
  isMobile.value = e.matches
}

onMounted(() => {
  mql = window.matchMedia('(max-width: 1024px)')
  isMobile.value = mql.matches
  mql.addEventListener('change', handleMqlChange)
})

onUnmounted(() => {
  mql.removeEventListener('change', handleMqlChange)
})
</script>

To utilize this method, simply use v-if="isMobile". This will accurately reflect changes in screen size upon page load, as well as adjustments made by the user such as device orientation change or browser tab resizing.

Answer 3

Answer №2

The global window object contains valuable information about screen width. See below for a breakdown of the properties available in the window.screen object.

Screen {
  availHeight
  availLeft
  availTop
  availWidth
  colorDepth
  height
  isExtended
  onchange
  orientation: ScreenOrientation {
    angle
    onchange
    type
    [[Prototype]]: ScreenOrientation
  }
  pixelDepth
  width
  [[Prototype]]: Screen
}

To access the screen width dynamically, you can create reactive properties using window.screen.width or window.screen.availWidth, depending on your specific requirements.

Answer 4

The global window object contains valuable information about screen width. See below for a breakdown of the properties available in the window.screen object.

Screen {
  availHeight
  availLeft
  availTop
  availWidth
  colorDepth
  height
  isExtended
  onchange
  orientation: ScreenOrientation {
    angle
    onchange
    type
    [[Prototype]]: ScreenOrientation
  }
  pixelDepth
  width
  [[Prototype]]: Screen
}

To access the screen width dynamically, you can create reactive properties using window.screen.width or window.screen.availWidth, depending on your specific requirements.

In Vue JS, assign a boolean value to a variable based on the screen width

Answer №1

Answer №2

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