How to change the page direction in Vue without refreshing the page

Question

I want to be able to change the orientation of the page when the value in Pinia changes, the code runs fine but the page will reload and I don't want the page to reload.

This is my App.vueFile

<script setup>
import { useaCountdownStore } from "./stores/countdowns";
import { storeToRefs } from "pinia";

const store = useaCountdownStore();
const { theme, language } = storeToRefs(store);

theme.value === "dark" ? document.documentElement.classList.add("dark") : false; //works
language.value === 'ar' ? document.documentElement.setAttribute('dir','rtl'): false // 需要重新加载页面
</script>

<template>
  <router-view></router-view>
</template>

Answer 1

Requires regular data binding. In this case, use an observer.

watch(
  language,
  value => {
   if (value === 'ar')
     document.documentElement.setAttribute('dir','rtl')
   else 
     document.documentElement.removeAttribute('dir')
  },
  { immediate: true }
)

Please make sure not to access document when rendering on the server side.

Answer 2

Try placing your content in another element instead of modifying the document. Additionally, use computed properties for responsiveness.

<script setup>
import { useaCountdownStore } from "./stores/countdowns";
import { storeToRefs } from "pinia";
import { computed } from "vue";

const store = useaCountdownStore();
const { theme, language } = storeToRefs(store);

const direction = computed(() => language.value === 'ar' ? 'rtl' : 'auto')
</script>

<template>
  <div :class="theme" :dir="direction">
    <router-view></router-view>
  </div>
</template>