ContentWindow postMessage

1. What does window postMessage do?
2. Is it safe to use window postMessage?
3. What is the difference between SendMessage and postMessage?
4. What is postMessage vulnerability?
5. Is postMessage asynchronous?
6. How do you communicate between two iframes?
7. What is postMessage API?
8. Does postMessage work cross domain?
9. What is window Onmessage?
10. How do I use window postMessage in react?
11. What is post messaging?
12. What does post message mean?
13. How do you communicate between two iframes?
14. What is targetOrigin in postMessage?
15. How to send message from parent to iframe?

What does window postMessage do?

The window. postMessage() method safely enables cross-origin communication between Window objects; e.g., between a page and a pop-up that it spawned, or between a page and an iframe embedded within it.

Is it safe to use window postMessage?

postMessage is generally considered very secure as long as the programmer is careful to check the origin and source of an arriving message. Acting on a message without verifying its source opens a vector for cross-site scripting attacks.

What is the difference between SendMessage and postMessage?

SendMessage: Sends a message and waits until the procedure which is responsible for the message finishes and returns. PostMessage: Sends a message to the message queue and returns immediately. But you don't know when that message is actually being processed.

What is postMessage vulnerability?

Dom Based XSS using Insecure postMessage():

A DOM-based Cross-Site Scripting (XSS) vulnerability occurs when the payload of a message event is handled in an unsafe way. The table below lists some of the most common functions and attributes that can lead to an XSS vulnerability.

Is postMessage asynchronous?

The postMessage() function is asynchronous, meaning it will return immediately. So you can not do synchronous communication with it. In your example, the posted message will vanish in the void, because there is no listener for the message event at the time the postMessage() function is executed.

How do you communicate between two iframes?

Communicating directly between iframes is also possible by combining window. parent with target as defined above. In conclusion, the postMessage method is a more dynamic alternative to the single DOM, better suited if you load multiple pages in one iframe, but not always easier and it still requires the use of the DOM.

What is postMessage API?

PostMessage API is used to interact with parent frame when Collabora Online's browser part is enclosed in one. This is useful for hosts wanting to integrate Collabora Online in them. This API is mostly based on WOPI specification with few extensions/modifications.

Does postMessage work cross domain?

PostMessage() is a global method that safely enables cross-origin communication. It's a lot like Ajax but with cross-domain capability. We'll give it a whirl by setting up two-way communication between a web page and an iframe whose content resides on another server.

What is window Onmessage?

The onmessage event occurs when a message is received through an event source. The event object for the onmessage event supports the following properties: data - Contains the actual message.

How do I use window postMessage in react?

import React from 'react'; import IconButton from '@material-ui/core'; import PhotoCamera from '@material-ui/icons/PhotoCamera'; import './App. css'; function App() const send = () => if (window && window. parent) console. log('we have message sending here', window.

What is post messaging?

postMessage() is a safe way to send messages between windows in different domains or origins. One can also post to an IFrame. The data being sent is serialized using the structured clone algorithm and will accept almost any type of simple or complex data.

What does post message mean?

Post a message means transferring, sending, posting, publishing, disseminating, or otherwise communicating, or attempting to transfer, send, post, publish, disseminate, or otherwise communicate, any message or information, whether truthful or untruthful, about an individual, and whether done under one's own name, under ...

How do you communicate between two iframes?

Communicating directly between iframes is also possible by combining window. parent with target as defined above. In conclusion, the postMessage method is a more dynamic alternative to the single DOM, better suited if you load multiple pages in one iframe, but not always easier and it still requires the use of the DOM.

What is targetOrigin in postMessage?

frames, etc. message: Data to be sent. targetOrigin: The origin of the targetWindow that is supposed to receive the message. If the targetWindow origin does not match the targetOrigin specified here, the message won't be dispatched at all. This adds a layer of security to the postMessage() functionality.

How to send message from parent to iframe?

Sending some data from the child iframe to the parent window is also pretty simple. Whenever you embed an iframe, the iframe will have a reference to the parent window. You just need to use the PostMessage API to send data via the window. parent reference of the parent window.