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Father - child html page communication with JavaScript postMessage
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Child Window</title> | |
| <meta charset="utf-8"> | |
| </head> | |
| <body> | |
| <h2>Child</h2> | |
| <input type="text" id="valueToSend" placeholder="Enter something..." /> | |
| <button onclick="sendMessage()">Send to Parent</button> | |
| <script> | |
| function sendMessage() { | |
| const value = [document.getElementById('valueToSend').value, 1, 3, 4]; | |
| if (window.opener) { | |
| window.opener.postMessage(value, window.location.origin); // Change origin if needed | |
| window.close(); // optional | |
| } | |
| } | |
| </script> | |
| </body> | |
| </html> |
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <title>Index</title> | |
| <meta charset="utf-8"> | |
| </head> | |
| <body> | |
| <h2>Index</h2> | |
| <input type="text" id="inputFromChild" placeholder="Waiting for message..." /> | |
| <button onclick="openChild()">Open Popup</button> | |
| <script> | |
| function openChild() { | |
| const params = 'width=400,height=300,resizable=no,scrollbars=no,menubar=no,toolbar=no,location=no,status=no,fullscreen=no,top=100,left=100'; | |
| const show_window = window.open('child.html', 'popup', params); | |
| show_window.focus(); | |
| } | |
| window.addEventListener('message', function (event) { | |
| // Always check origin for security | |
| if (event.origin !== window.location.origin) { | |
| console.warn("Blocked message from unknown origin:", event.origin); | |
| return; | |
| } | |
| // Set received value in input | |
| document.getElementById('inputFromChild').value = event.data[1]; | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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