How do I use Windows postMessage?
window. postMessage()
- message. Required. Message string/object to be sent.
- domain. Required. The URL of the receiver window to which the message is being sent.
- transfer. Optional. Transferable objects like instances of ImageBitmap, ArrayBuffer, MessagePort; becomes unusable on the sender side after transfer.
How do I get a parent window?
To obtain a window’s owner window, instead of using GetParent, use GetWindow with the GW_OWNER flag. To obtain the parent window and not the owner, instead of using GetParent, use GetAncestor with the GA_PARENT flag.
Is postMessage secure?
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.
Is postMessage thread safe?
This method is a thread-safe solution to send messages to windows. Those messages will be handled in the message loop of the application and therefore can be sent from any thread.
Can two iFrames communicate?
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.
Can PostMessage fail?
If you send a message in the range below WM_USER to the asynchronous message functions (PostMessage, SendNotifyMessage, and SendMessageCallback), its message parameters cannot include pointers. Otherwise, the operation will fail.
What is PostMessage?
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.