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July 30, 2019 13:38
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State management with custom DOM events
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8" /> | |
| <script type="module"> | |
| const createAction = (el, initialState, name, action) => { | |
| let currentState = initialState; | |
| document.body.addEventListener(name, (e) => { | |
| el.render(e.detail.state); | |
| }); | |
| return (...args) => { | |
| return (originalEvent) => { | |
| const newState = action(currentState, ...args); | |
| currentState = newState; | |
| const event = new CustomEvent( | |
| name, | |
| { | |
| bubbles: true, | |
| cancelable: false, | |
| detail: { | |
| state: newState, | |
| originalEvent: originalEvent | |
| } | |
| } | |
| ); | |
| el.dispatchEvent(event); | |
| } | |
| } | |
| } | |
| // Initialize message | |
| const messageEl = document.querySelector('#message'); | |
| const initialState = { | |
| message: 'hi ' | |
| }; | |
| messageEl.render = function ({ message }) { | |
| this.innerHTML = message; | |
| } | |
| messageEl.render(initialState); | |
| const updateMessage = createAction( | |
| messageEl, | |
| initialState, | |
| 'UPDATE_MESSAGE', | |
| (state, ...args) => { | |
| state.message += 'hi '; | |
| return state; | |
| } | |
| ) | |
| // Initialize button | |
| const buttonEl = document.querySelector('#update-message'); | |
| buttonEl.addEventListener('click', updateMessage()) | |
| </script> | |
| </head> | |
| <body> | |
| <div id="message"></div> | |
| <button id="update-message">Update message</button> | |
| </body> |
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