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msgio

If you are familiar with socket.io, you already know how to use this package.

socket.io is based on WebSocket.

msgio is based on postMessage.

Occasionally, we need to build web apps with iframes agross different domains. Communication between these iframes always make us uncomfortable .Using this library less pain you will suffer.

Examples

All examples are in the 'examples' directory in this repository.

Install

npm

npm install --save msgio

<script>

<script src="//<path to msgio>/msgio.min.js"></script>
<script>
  console.log(window.msgio); // Iframe, Guest
  // For detail usage, see below...
</script>

Usage

Iframe

In your Main App

import {Iframe} from 'msgio';

const iframe = document.getElementById('my-iframe');

const onLoad = e => {
    const io = new Iframe(e.target);

    io.on('connect', socket => {
        // listening some events from the guest
        socket.on('my_custom_event', data => {
            // data: {x: 1, y: 2}
            // any code
        });

        // emit events to the guest
        socket.emit('greeting', 'hello world!');

        // expose functions to the guest
        socket.func('my_sync_fn', (a1, a2, ...rest) => {
            // a1: 1
            // a2: 2
            // rest: 3, 4, 5
            // any code
            // you can throw as usual!
        });

        // you can expose aysnc functions too.
        socket.func('my_async_fn', (a1, a2, ...rest) => {
            // a1: 'a'
            // a2: 'b'
            // rest: 'c', 'd', 'e'
            return new Promise((resolve, reject) => {
                // any code
            });
        });

        // call some functions the guest provides.
        socket.call('hi', 'guest', '!')
            .then(result => {
                // as you call the 'hi' function with args 'guest' and '!'
                // the resule may be 'hello host!', who knows!
                // any code
            })
            .catch(error => {
                // the guest may throw error to you
            });
    });
};

iframe.addEventListener('load', onLoad);

In your Iframe

import {Guest} from 'msgio';

// You must provide the host's origin. It's all.
const io = new Guest({host: 'http://localhost:8080'});

// Like in your main app
io.on('connect', socket => {
    // the host will use this to set the <iframe>'s width and height.
    io.resize({width: 400, height: 600});

    // listening some events from the host
    socket.on('greeting', data => {
        // data: 'hello world!'
        // any code
    });

    // emit events to the guest
    socket.emit('my_custom_event', {x: 1, y: 2});

    // call functions from the host.
    socket.call('my_sync_fn', 1, 2, 3, 4, 5)
        .then(result => {
            // any code
        })
        .catch(error => {
            // catch the error
        });

    socket.call('my_async_fn', 'a', 'b', 'c', 'd', 'e')
        .then(result => {
            // any code
        })
        .catch(error => {
            // catch the error
        });

    socket.func('hi', (a1, a2, a3) => {
        // a1: 'guest'
        // a2: '!'
        // a3: undefined
        // any code
        // return 'hello host!'
    });
});