Created
January 4, 2024 09:45
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van.js simple todo app
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1"> | |
| <link rel="stylesheet" href="https://cdn.jsdelivr.net/gh/yegor256/tacit@gh-pages/tacit-css.min.css"/> | |
| <script type="module" src="main.js"></script> | |
| <title>Document</title> | |
| </head> | |
| <body> | |
| </body> | |
| </html> |
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| import van from "https://cdn.jsdelivr.net/gh/vanjs-org/van/public/van-1.2.7.min.js" | |
| const { button, span, input, div } = van.tags | |
| // TodoItem is only focused on the task item. It should only notify the parent component if the item has been deleted | |
| const TodoItem = ({ondelete}, val) => span(val, " ", button({ onclick: ondelete }, "x")); | |
| const TodoList = () => { | |
| if (!localStorage.tasks) { | |
| localStorage.tasks = "[]" | |
| } | |
| const tasks = van.state(JSON.parse(localStorage.tasks)), newTask = van.state(""); | |
| van.derive(() => localStorage.tasks = JSON.stringify(tasks.val)) | |
| const addTask = () => { | |
| if (newTask.val.trim().length > 0) { | |
| // van.js state won't trigger if I update the array itself. I should assign new array; | |
| tasks.val = [newTask.val].concat(tasks.val); | |
| newTask.val = ""; | |
| } | |
| }; | |
| const deleteTask = (delIdx) => { | |
| tasks.val = tasks.val.filter((_, idx) => idx !== delIdx); | |
| } | |
| return span( | |
| input({type: "text", value: newTask, oninput: e => newTask.val = e.target.value}), | |
| " ", | |
| button({ onclick: addTask }, "+"), | |
| () => div( | |
| tasks.val.map(van._((t, i) => div(TodoItem( { ondelete: () => deleteTask(i)}, t)))) | |
| ) | |
| ); | |
| } | |
| van.add(document.body, TodoList()) |
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