Created
January 9, 2020 19:08
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The State Reducer Pattern between separated windows (window.open)
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Frame</title> | |
| </head> | |
| <body> | |
| <button>Send message</button> | |
| <script> | |
| (function() { | |
| const ACTION = { | |
| SHOW_ALL: 'SHOW_ALL', | |
| SHOW_COMPLETED: 'SHOW_COMPLETED', | |
| SHOW_ACTIVE: 'SHOW_ACTIVE' | |
| } | |
| const handler = ({origin, data}) => { | |
| if (origin !== url) { | |
| return; | |
| } | |
| switch (data) { | |
| case ACTION.SHOW_ALL: | |
| alert('Show all'); | |
| break; | |
| case ACTION.SHOW_COMPLETED: | |
| alert('Completed'); | |
| break; | |
| case ACTION.SHOW_ACTIVE: | |
| alert('Show active'); | |
| break; | |
| default: | |
| throw new Error(`Invalid action ${JSON.stringify(data)}`); | |
| } | |
| } | |
| const { protocol, host, hash, href } = location; | |
| const url = `${protocol}//${host}`; | |
| const target = hash === "#child" ? opener : open(location.href + "#child"); | |
| window.addEventListener('message', (e) => handler(e)); | |
| document.querySelector('button').addEventListener('click', () => | |
| target.postMessage(ACTION.SHOW_ALL) | |
| ); | |
| })(); | |
| </script> | |
| </body> | |
| </html> |
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