A simple Localization tool for Vuex/Vue (3)

I created it while developing with Laravel and was facing the problem, that I do not want load all translations at once.

• uses nearly the same function signatures provided by Laravel. See https://laravel.com/docs/8.x/helpers#method-trans
• contextual loading supported
• supports deferred loading

This is an experimental version and not indented for production usage yet.

• Installation
• Usage by Example
  • Contextual loading (optional)
  • Initialization
  • Usage in templates
    • Inner component
    • Outermost component
• Api
  • useLocalizationContextLoader
    • getContextualLocalization
    • loadDeferredLocalization
  • useTranslation
    • trans
    • transChoice
    • t
    • addDeferredLocalizationContext
• Other
  • Language data examples
    • Initial data
    • Contextual Data

npm i -D @gelbehexe/debbie-vuex-i18n

This is only required if you want to use contextual loading.

Create a language loader function e.g. lib/languageLoader.js

function languageLoader(contexts) {
    return new Promise(function (resolve, reject) { 
        axios.get("/api/localization-context",{
            params: {
                contexts
            }
        }).resolve(data => {
            resolve(data)
        }).catch(err => reject(err))
    })
}

In your main script e.g. app.js

import { createApp } from 'vue'
import App from './App.vue'

import store from "@/lib/store"; // your configured storage
import { translationPlugin } from "@gelbehexe/debbie-vuex-i18n"

// required only for contextual language loading
import languageLoader from "@/lib/languageLoader";

const app = createApp(App)

app.use(store)

// add plugin to app
app.use(translationPlugin, {
    store,
    languageLoader,
    // your localization languages
    locale: {
        current: "de",
        fallback: "en",
    },
    // Initial translations
    // - for fallback locale only the keys
    //   which are not set in default language 
    //   are needed
    translations: {
        en: {
            en1: "English Only",
        },
        de: {
            key1: "Deutsch 1",
            key2: "Deutsch 2",
            en_de: "Englisch und Deutsch"
        }
    }
})


app.mount('#app')

<templatep>
  <div>
    <h1>{{ t("key1") }}</h1>
    <p>{{ t("context1.key1"}}</p>
  </div>
</templatep>

<script>
import store from "@/lib/store"; // your configured storage
import { useTranslation } from "@gelbehexe/debbie-vuex-i18n"

export default {
  name: "MyComponent",
  setup() {
    const { t, addDeferredLocalizationContext } = useTranslation(store)
    addDeferredLocalizationContext("context1")
    
    return {
      t
    }
  }
}
</script>

Use v-vuex-translation directive to trigger previously deferred context loading. You can use it without a value or with a method which is called after loading.

Important: For a dynamic update after contextual loading it is necessary that the context is rendered.

<template>
  <div v-vuex-translation="handleTranslationLoaded">
    <div v-if="loading">Loading ...</div>
    <!-- Important do not use v-else here -->
    <div v-show="!loading">
      <h1>{{ t("key2" }}</h1>
      <slot></slot>
    </div>
  </div>
</template>

<script>
import { ref } from "vue"
import store from "@/lib/store"; // your configured storage
import { useTranslation } from "@gelbehexe/debbie-vuex-i18n"

export default {
  name: "Layout",
  setup() {
    const loading = ref(true)
    
    const { t } = useTranslation(store)
    
    function handleTranslationLoaded() {
      loading.value = false;
    }

    return {
      t,
      loading,
      handleTranslationLoaded
    }
  }
}

</script>

Returns the following functions as object:

Loads localization contexts directly

Loads previously added lazy contexts

If you are using the directive v-vuex-translation contextual loading is automatically triggered. Then there is no need for calling this function manually

Hint: Most of the functions are adopted from Laravel Localization, but not the __() because eslint does not like the underscores. Except: The locale parameter is not available.

Returns the following functions as object:

Simply translates a string.

See https://laravel.com/docs/8.x/helpers#method-trans

Get a translation according to an integer value.

See https://laravel.com/docs/8.x/helpers#method-trans-choice

Alias for trans

Adds a context for deferred loading.

For now there is only one directive:

You are not required to set all localization keys for fallback language since they are only used if not defined for default language

    {
        en: {
            en1: "English Only",
        },
        de: {
            key1: "Deutsch 1",
            key2: "Deutsch 2",
            en_de: "Englisch und Deutsch"
        }
    }

Data coming from LanguageLoader. Existing keys will be overridden.

For sure this could happen intentionally or accidentally.

{
  en: {
    "context1.key3": "Contextual English 3",
  },
  de: {
    "context1.key1": "Context Deutsch 1",
    "context1.key2": "Context Deutsch 2",
    "context1.key4": "Context Deutsch 4",
  },
}