![]() There is also a postMessage() that can be used when the browser context is the same. The data being sent is serialized using the structured clone algorithm and will accept almost any type of simple or complex data. Window.postMessage() is a safe way to send messages between windows in different domains or origins. The targetOrigin is contained in event.origin. The callback function, an Arrow function in our case, processes the message. The Event Listener of the recipient window receives the message in a parameter named “event”. The targetOrigin should be the domain in which the recipient page resides. ![]() ![]() When “Send Message” is clicked, an Object is being sent to the recipient page using the reference to that window, childwin, created during window.open().Īgain, DO NOT use “” other than for testing. Result of childwin.postMessage() What is Happening? The message is received by the pop-up window. This opens the pop-up.Ĭlick the “Send Message” button. Window.addEventListener("message", (event)=>` Allow window to listen for a postMessage html (note callback function in addEventListener) In production, DO NOT use '*', use toe target domainĬhildwin.postMessage(msg,'*')// childwin is the targetWindow html (note the sendMessage function) Ĭhildwin = window.open('.html', childname, 'height=300px, width=500px') html.html will be a pop-up, it does not have to be, this is just my choice. and the recipient’s domain would be as well. In other words, we may want to send a message from to. Keep in mind, we are typically sending from one domain to another, so targetOrigin must match the domain of the targetWindow listener. If they do not match, do not accept the message.īeware: If “” is used as targetOrigin, the message could be from anyone. To stress this further, in production, on the receiving end, you will want to validate the receivers domain against the targetOrigin. It is possible to use “” as the targetorigin, but only do that for simple testing (as we will do here.) At the moment of dispatch (postMessage), if the targetOrigin, does match the host name of targetWindow’s page, it will fail to send. ![]() **targetOrigin **is a very important piece. However, this does mean you can pass a broad variety of data Objects safely. ![]() The structured clone algorithm does not allow for functions. However, functions cannot be sent as part of the message as the message data is serialized using the structured clone algorithm. **message **can be quite a few complex objects. **targetWindow **is a handle to the window to which you want to send the message. You may want to read more about on the MDN. There is a optional third parameter,, that we will not be using. The syntax for the postMessage() method is, *targetWindow*.postMessage(*message*, *targetOrigin*, ) Window.addEventListener(“ message”, callback) - to receive and process the message Window.postMessage() - to send the message Syntax The two required components and their syntax In this article, we will focus on communication** between windows** and not a window and an iframe.īy the way, the statement on the MDN says pop-up window, which we will use, but the recipient window does not have to be a pop-up. However, there is a useful and often overlooked feature of HTML5, window.postMessage(), which is safe if used correctly.Īs stated on the MDN, 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. Cross-Domain communication (also called Cross-origin) can be difficult and pose security risks. ![]()
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