single-spa-alpinejs

single-spa-alpinejs is a helper library for mounting alpinejs components as single-spa applications or parcels.

npm install --save single-spa-alpinejs
# or
yarn add single-spa-alpinejs

Alternatively, you can use single-spa-alpinejs from a CDN as a global variable:

<script src="https://cdn.jsdelivr.net/npm/single-spa-alpinejs"></script>

Note that you might want to lock down the package to a specific version. See here for how to do that.

There are three ways the you can define AlpineJS components as single-spa applications or parcels.
The simplest way where the template contains all the required data and initialization logic (including x-data and x-init) as part of the dom. The template is provided via the options attribute template
You could also provide x-data externally and the helper will add it to the component.
- The x-data can be provided in the following forms (via the options attribute xData)
  - an object
  - a function that returns an object
  - a function that returns a promise which resolves with an object.
You can also provide x-init externally along with the x-data and the helper will add it to the component.
The x-init can be provided in the following forms (via the options attribute xInit) and needs to be a function.
Please note the xData attribute must be provided otherwise the xInit attribute will be ignored.
The sample below references the example from the Alpine Toolbox - Alpine JS and fetch() and demonstrates how you can use the xInit and xData attributes to create an AlpineJS application .

import singleSpaAlpinejs from 'single-spa-alpinejs';
const alpinejslifecycles = singleSpaAlpinejs({
  template: `
    <div class="rounded overflow-hidden shadow-lg font-sans p-1 m-1" 
         x-data="{ open: false }">
      <div class="font-bold p-1">Example for x-show attribute</div>
      <button class="bg-transparent hover:bg-blue-500 text-blue-700 font-semibold 
              hover:text-white py-2 px-4 border border-blue-500 
              hover:border-transparent rounded" 
              @click="open = !open">Open/Close</button>
      <div x-show="open" class="text-4xl">
          Hey, I'm open
      </div>
    </div>`,
});
export const bootstrap = alpinejslifecycles.bootstrap;
export const mount = alpinejslifecycles.mount;
export const unmount = alpinejslifecycles.unmount;

Example usage when installed via CDN:

The usage is similar and once the library is loaded it will be available globally and accessed via the window object.

const alpinejsApp = window.singleSpaAlpinejs({
  template: `
    <div class="rounded overflow-hidden shadow-lg font-sans p-1 m-1" 
         x-data="{ open: false }">
      <div class="font-bold p-1">Example for x-show attribute</div>
      <button class="bg-transparent hover:bg-blue-500 text-blue-700 font-semibold 
      hover:text-white py-2 px-4 border border-blue-500 
      hover:border-transparent rounded" @click="open = !open">Open/Close</button>
      <div x-show="open" class="text-4xl">
          Hey, I'm open
      </div>
    </div>`,
});
singleSpa.registerApplication({
  name: 'name',
  app: alpinejsApp,
  activeWhen: () => true,
});

import singleSpaAlpinejs from 'single-spa-alpinejs';
const alpinejslifecycles = singleSpaAlpinejs({
  template: `
    <div class="rounded overflow-hidden shadow-lg font-sans p-1 m-1">
      <div class="font-bold p-1">Example for x-show attribute</div>
      <button class="bg-transparent hover:bg-blue-500 text-blue-700 font-semibold 
      hover:text-white py-2 px-4 border border-blue-500 
      hover:border-transparent rounded" @click="open = !open">Open/Close</button>
      <div x-show="open" class="text-4xl">
          Hey, I'm open
      </div>
    </div>`,
  xData: { open: false },
});
export const bootstrap = alpinejslifecycles.bootstrap;
export const mount = alpinejslifecycles.mount;
export const unmount = alpinejslifecycles.unmount;

import singleSpaAlpinejs from 'single-spa-alpinejs';
const appTemplate = `
    <div class="w-full h-full text-gray-800">
        <h1 class="mt-0 mb-3 font-light text-3xl" x-text="title"><!-- title text --></h1>
        <p class="text-xl text-gray-600 font-light mb-4" x-html="intro"><!-- intro text --></p>
        <div class="flex flex-wrap -mx-2 pb-8">
        <!-- begin: user card -->
        <template x-for="user in users" :key="user.id">
            <div class="w-full md:w-1/2 lg:w-1/3 xl:w-1/4 h-auto font-light">
            <div class="flex bg-white rounded-lg shadow-md m-2 border-l-4 
                        border-white hover:shadow-2xl hover:border-pink-500 
                        cursor-pointer relative">
                <div class="p-4 pr-6 leading-normal">
                <div class="font-medium text-xl truncate" x-text="user.name"></div>
                <div class="truncate uppercase text-xs text-gray-500 font-semibold 
                pb-2 tracking-widest" x-text="user.company.name"></div>
                <div class="" x-text="user.phone"></div>
                <a class="text-blue-600 hover:text-blue-700 mr-4 block"     
                    x-bind:href="'mailto:' + user.email" x-text="user.email"></a>     
                <a class="text-blue-600 hover:text-blue-700 block" 
                x-bind:href="'https://' + user.website" x-text="user.website"></a>
                </div>
            </div>
            </div>
        </template>
        <!-- end: user card -->
        </div>
    </div>
  `;
const appDataFn = ({ title, name }) => ({
  title,
  intro:
    'Implement a simple <code class="text-md text-pink-600">fetch()</code> request to render a list of items using Alpine.js :)',
  users: [],
  open: false,
  name,
});
const appXInitFn = (id) => {
  return fetch('https://jsonplaceholder.typicode.com/users')
    .then((response) => response.json())
    .then((data) => (document.querySelector(`#${id}`).__x.$data.users = data));
};
const opts = {
  template: appTemplate,
  xData: (data) => appDataFn(data), // pass props to x-data
  xInit: appXInitFn,
};
const alpinejslifecycles = singleSpaAlpinejs(opts);
export const bootstrap = alpinejslifecycles.bootstrap;
export const mount = alpinejslifecycles.mount;
export const unmount = alpinejslifecycles.unmount;

single-spa-html is called with an object that has the following properties:

template (required): An HTML string or a function that returns a string. The function will be called with the single-spa custom props. The returned string is injected into the DOM during the single-spa mount lifecycle.
domElementGetter (optional): A function that returns the dom element container into which the HTML will be injected. If omitted, a default implementation is provided that wraps the template in a <div> that is appended to document.body.
xData (optional): An object or a function or a function that returns a promise.The returned string is injected into the DOM as the x-data attribute during the single-spa mount lifecycle.
xInit (optional): A function or a function that returns a promise. The function provided is added to the global scope and the function initiation along with the root dom element id as a parameter is injected into the DOM as the x-init attribute during the single-spa mount lifecycle. Please note the xData attribute must be provided otherwise the xInit attribute will be ignored. The function you provide xInit
This section covers the details of how xData and xInit option attributes are processed by the single spa helper.
Consider the example below

const appDataFn = () => { open: false, loading: true }
const appXInitFn = (domId) => {
    console.log('Hello from appXInitFn');
  // domId provides access to the parent dom element where x-data and x-init are defined
    document.querySelector(`#${domId}`).__x.$data.loading = false
}
const opts = {
  template: appTemplate,              // base template
  xData: (data) => appDataFn(data), // pass props to x-data
  xInit: appXInitFn,                    // x-Init function
};
const alpinejsApp = singleSpaAlpinejs(opts);
singleSpa.registerApplication({
  name: 'myapp',
  app: alpinejsApp,
  activeWhen: () => true,
});

The helper does the following
- Adds the template to the dom wrapped in parent dom element with and id that has a prefix of alpine. In this case it will be id='alpine-myapp'
- Attaches a resolved xData as a string x-data="{ "name": "myapp" ,"open": false }" to the parent dom element.
- It will make the user defined appXInitFn available globally as an attribute of window.singleSpaAlpineXInit and will be accessible via variable window.singleSpaAlpineXInit.myapp
- Attaches a resolved xInit as a string that calls the globally defined variable x-init="singleSpaAlpineXInit.myapp('alpine-myapp')" to the parent dom element.
- Note that this also passes id of the parent dom element which can then be used to access the alpine data elements to update the state as required.
- You may have special characters in the application name for example @my/app. See the example below
```
    singleSpa.registerApplication({
    name: '@my/app',
    app: alpinejsApp,
    activeWhen: () => true,
        });
```
- The single spa helper converts these to valid global function names by replacing all the special characters with underscores (_). This does not require any special handling from the user as the helper takes care of this internally
- In the above case the xInit dom element would look like the following x-init="singleSpaAlpineXInit._my_app('alpine-@my/app')" where the xInit function is available as a global variable _my_app.

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