带有Vuex.js的Vue.js组件（而不是vue-i18n.js）

Question

I've been trying to reproduce the button behavior that I've here , but with a different implementation. Basically, I'm trying to use Vuex instead of vue-i18n.js for internationalization purposes.

I now have the following code block, the purpose of which is to create language states and perform a XMLHttpRequest (for the .json files storing the various translations):

Vue.use(Vuex);
var storelang = new Vuex.Store({
    state: {
        lang: {}
    },
    mutations: {
        LANG: function (state, ln) {
            function loadJSON(callback) {
                var xobj = new XMLHttpRequest();
                xobj.overrideMimeType("application/json");
                xobj.open('GET', '../resources/i18n/' + ln + '.json', true);
                xobj.onreadystatechange = function () {
                if (xobj.readyState == 4 && xobj.status == "200") {
                        callback(xobj.responseText);
                    }
                };
                xobj.send(null);
            }

            loadJSON(function (languageJSON) {
                state.lang = JSON.parse(languageJSON);
            })
        },
        strict: true
    }
});

var mix = Vue.mixin({
    computed: {
        lang: function () {
        return storelang.state.lang;
        }
    }

});

On my component constructor (created and initialized in the root Vue instance), I've the following:

components: {
        lang: {
            template: '<button type="button" class="btn btn-info" @click.prevent=activate(lang.code) @click="setActiveLang" v-show="!isActive">{{ lang.code }}</button>',
            props: [
                'active',
                'lang'
            ],
            computed: {
                isActive: function() {
                    return this.lang.code == this.active.code
                }
            },
            methods: {
                activate: function(code) {
                    storelang.dispatch('LANG', code);
                },
                setActiveLang: function() {
                    this.active = this.lang;
                }
            },
            ready: function() {
                storelang.dispatch('LANG', 'en'); //default language
            }
        }
    }

On my root Vue instance's data object , I've added the following:

langs: [{
    code: "en"
}, {
    code: "fr"
}, {
    code: "pt"
}],
active: {
    "code": "pt"
}

And finally, on my html :

<div v-for="lang in langs">
    <p>
        <lang :lang="lang" :active.sync="active"></lang>
    </p>
</div>

I cannot figure out what I'm doing wrong here.

---

UPDATE

Here's a JsFiddle (I've exchanged the XMLHttpRequest request for json arrays). Also, this is a working example, but the language selector buttons do not hide when the respective language is selected, which is the opposite of what I want. Meaning that, I'm attempting to hide each individual language selector button when the user clicks it and selects the respective language (while showing the other language selector buttons).

Answer 1

The solution involves saving an active state in the store , in addition to the lang state:

new Vuex.Store({
    state: {
        active: {},
        lang: {}

Adding an ACTIVE mutation :

ACTIVE: function(state, ln) {
        var langcode = 'en'
    //portuguese
    if (ln === 'pt') {
        langcode = 'pt'
    }
    //french
    if (ln === 'fr') {
        langcode = 'fr'
    }
  state.active = langcode
}

On the computed properties block, one also needs to add getter functions for the active state and return the langcode that is currently active :

Vue.mixin({
    computed: {
        lang: function() {
            return storelang.state.lang
        },
        enIsActive: function() {
            return storelang.state.active == 'en'
        },
        frIsActive: function() {
            return storelang.state.active == 'fr'
        },
        ptIsActive: function() {
            return storelang.state.active == 'pt'
        }
    }
})

Then, it is just a question of conditionally displaying each of the buttons on the component template by adding v-show="!enIsActive" , v-show="!frIsActive" , etc.:

var langBtn = Vue.extend({
template: '<button type="button" class="btn btn-info" @click.prevent=activate("en") v-show="!enIsActive">en</button><button type="button" class="btn btn-info" @click.prevent=activate("pt") v-show="!ptIsActive">pt</button><button  type="button" class="btn btn-info" @click.prevent=activate("fr") v-show="!frIsActive">fr</button>',

Finally, on the activate method, adding a new line to change the active state when the user clicks a button:

methods: {
    activate: function(x) {
      storelang.dispatch('LANG', x)
      storelang.dispatch('ACTIVE', x)
    }
  }, 

The full working code here .