frame-bridge

This module simplifies communication between a parent page and an embedded page (i.e. a page inside an iframe) on another domain. By using the post message api under the hood, FrameBridge enables you to define an api on both sides (web page and iframed page) and expose it to the other side, thus creating a "bridge" between the frames. The api supports return values from the remote side of the bridge using promises which makes calling functions across domains very intuitive.

Installation

bower install frame-bridge

Usage

Include the api in both parent and child

Parent and child

<script src="frame-bridge.min.js"></script>

Setup the api to be exposed in both parent and child

Parent

var localApiParent = {
  printMessageFromChild: function(message) {
    console.log(message);
  }
};

Child

var localApiChild = {
  printMessageFromParent: function(message) {
    console.log(message);
  }
};

Create the bridge in both parent and child

Parent

// Create the bridge object using the parent's local api, the iframe's content window and the child domain.
var contentWindow = document.getElementById('iframe-id').contentWindow;
var domain = 'http://child.domain.com';
var frameBridge = FrameBridge.create(localApiParent, contentWindow, domain);

Child

// Create the bridge object using the child's local api, the parent window and the parent domain.
var contentWindow = window.parent;
var domain = 'http://parent.domain.com';
var frameBridge = FrameBridge.create(localApiChild, contentWindow, domain);

Initialize the bridge in both parent and child

Parent

frameBridge.init(function(remoteApi) {
  remoteApi.printMessageFromParent('Hello from parent');
});

Child

frameBridge.init(function(remoteApi) {
  remoteApi.printMessageFromChild('Hello from child');
});

Returning values

Returning values from the remote side can be done in one of two ways.

Returning the value directly

var localApiParent = {
  getReturnValue: function() {
    return 'Return value';
  }
};

Returning a promise that will later be resolved (or rejected)

var localApiParent = {
  getReturnValueUsingPromise: function() {
    var deferred = FrameBridge.defer();

    setTimeout(function() {
      deferred.resolve('Return value using promise');
    }, 1000);

    return deferred.promise;
  }
};

The value will always be returned as a promise on the calling side of the bridge

remoteApi.getReturnValue().success(function(returnValue) {
  console.log(returnValue); // 'Return value'
});

remoteApi.getReturnValueUsingPromise().success(function(returnValue) {
  console.log(returnValue); // 'Return value using promise'
});

Develop

npm install
grunt develop

License

ExpressenAB/frame-bridge

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