ember-window-messenger

ember-window-messenger

This Ember addon is a lightweight postMessage client/server implementation. It is built on promises so the fetch and rpc methods can be used directly in your route model() hooks.

For changelog see CHANGELOG.md

It supports JSON only messages for now

Compatibility

• Ember.js v3.20 or above
• Ember CLI v3.20 or above
• Node.js v12 or above

Usage

ember install ember-window-messenger

Configuration

Add target:origin map to your config/environment.js. This effectively defines which targets (windows, frames) is your app communicating with.

APP: {
  // Here you can pass flags/options to your application instance
  // when it is created
  'ember-window-messenger': {
    'parent': 'http://localhost:4200',
    'target-1': 'http://localhost:4200',
    'target-2': 'http://localhost:4200',
    'popup': 'http://localhost:4200'
  }
}

This list is also used for validation, to check if message comes from an allowed origin.

Examples

If you dare, fire up the dummy app in this addon and test it out. Below are the basic examples, see dummy app for more.

Setup server on parent

// app/service/your-server.js
import Service, { inject as service } from '@ember/service';

export default class YourServerService extends Service {
  @service('window-messenger-server');
  server;

  setup() {
    this.server.on('demo-data', this.onDemoDataRequest);
  }

  teardown() {
    this.server.off('demo-data', this.onDemoDataRequest);
  }

  onDemoDataRequest = (resolve, reject, query) => {
    resolve('Some data');
  }
}

// app/routes/your-route.js
import Route from '@ember/routing/route';
import { inject as service } from '@ember/service';

export default class YourRoute extends Route {
  @service('your-server');
  yourServer;

  activate() {
    super.activate();
    this.yourServer.setup();
  }

  deactivate() {
    super.deactivate();
    this.yourServer.teardown();
  }
}

Fetch from parent

import Route from '@ember/routing/route';
import { inject as service } from '@ember/service';

export default class YourRoute extends Route {
  @service('window-messenger-client')
  client;

  model() {
    return this.client.fetch('demo-data');
  }
}

Fetch from a specific target

This can be used from parent window to frames/tabs communication.

import Route from '@ember/routing/route';
import { inject as service } from '@ember/service';

export default class YourRoute extends Route {
  @service('window-messenger-client')
  client;

  model() {
    return this.client.fetch('popup:demo-data');
  }
}

Execute RPC call

Internally it is the same as fetch, but provides semantic sugar to your app code.

import Controller from '@ember/controller';
import { inject as service } from '@ember/service';
import { action } from '@ember/object';

export default class YourController extends Controller {
  @service('window-messenger-client')
  client;

  @action
  runMe() {
    this.client.rpc('start-worker').then((response) => {
      // handle response here
    });
  }
}

iFrames, popup windows

If you want to communicate with an iframe or a popup window opened with window.open, then you have to register your window instance on the client with matching target name from config/environment map.

iFrame

// app/components/x-frame.js
import Component from '@glimmer/component';
import { inject as service } from '@ember/service';

export default class XFrameComponent extends Component {
  @service('window-messenger-client')
  client;

  register(frameElement) {
    this.client.addTarget(this.args.target, frameElement.contentWindow);
  },

  unregister() {
    this.client.removeTarget(this.args.target);
  }
}

<!-- app/components/x-frame.hbs -->
<!-- Install ember-render-modifiers for did-insert/will-destory modifiers -->
<iframe 
  ...attributes
  {{did-insert this.register}}
  {{will-destory this.unregister}}
></iframe>

<!-- app/templates/your-route.hbs -->
<XFrame src="<url>" @target="target-1"/>

Popup with window.open

// app/controller/your-controller.js
import Controller from '@ember/controller';
import { inject as service } from '@ember/service';
import { action } from '@ember/object';
import { tracked } from '@glimmer/tracking';

export default class YourController extends Controller {
  @service('window-messenger-client')
  client;

  @tracked
  model = null;

  @action
  openPopup() {
    let win = window.open('/some/path', 'Example popup', 'toolbar=no,resizable=no,width=400,height=400');
    this.client.addTarget('popup', win);
  }

  @action
  fetchFromPopup() {
    this.client.fetch('popup:some-data').then((name) => {
      this.model = name;
    });
  }
}

Open popup if it isn't already open, or has been closed by the user

// app/controller/your-controller.js
import Controller from '@ember/controller';
import { inject as service } from '@ember/service';
import { action } from '@ember/object';

export default class YourController extends Controller {
  @service('window-messenger-client')
  client;

  @action
  openPopup() {
    if (!this.client.hasTarget('popup')) {
      let win = window.open('/some/path', 'Example popup', 'toolbar=no,resizable=no,width=400,height=400');
      this.client.addTarget('popup', win);
    }
  }
}

License

This project is licensed under the MIT License.

Changelog

[3.3.0] - 2021-12-14

Added

• Add test waiter to make window-messenger-client service notify Ember testing harness of pending promises.