chill-bundles/src/Bundle/ChillMainBundle/Resources/public/module/pick-postal-code/index.js

import { createApp } from 'vue';
import PickPostalCode from 'ChillMainAssets/vuejs/PickPostalCode/PickPostalCode';
import { _createI18n } from 'ChillMainAssets/vuejs/_js/i18n';
import { appMessages } from 'ChillMainAssets/vuejs/PickEntity/i18n';
import { makeFetch } from 'ChillMainAssets/lib/api/apiMethods';

const i18n = _createI18n(appMessages);


function loadOnePicker(el, input, uniqId, city) {
    const app = createApp({
        template: '<pick-postal-code @select-city="onCitySelected" @removeCity="onCityRemoved" :picked="city"></pick-postal-code>',
        components: {
            PickPostalCode,
        },
        data() {
            return {
                city: city,
            }
        },
        methods: {
            onCitySelected(city) {
                this.city = city;
                input.value = city.id;
            },
            onCityRemoved(city) {
                this.city = null;
                input.value = '';
            }
        }
    })
        .use(i18n)
        .mount(el);
}

function loadDynamicPickers(element) {

    let apps = element.querySelectorAll('[data-module="pick-postal-code"]');

    apps.forEach(function(el) {

        const
            uniqId = el.dataset.uniqid,
            input = document.querySelector(`input[data-input-uniqid="${uniqId}"]`),
            cityIdValue = input.value === '' ? null : input.value
        ;

        if (cityIdValue !== null) {
            makeFetch('GET', `/api/1.0/main/postal-code/${cityIdValue}.json`).then(city => {
                loadOnePicker(el, input, uniqId, city);
            })
        } else {
            loadOnePicker(el, input, uniqId, null);
        }
    });
}

document.addEventListener('DOMContentLoaded', function(e) {
    loadDynamicPickers(document)
})