mirror of
https://github.com/jaandrle/deka-dom-el
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722 lines
17 KiB
JavaScript
722 lines
17 KiB
JavaScript
/**
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* Case Study: Task Manager Application
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*
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* This example demonstrates:
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* - Complex state management with signals
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* - Drag and drop functionality
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* - Local storage persistence
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* - Responsive design for different devices
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*/
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import { el, on } from "deka-dom-el";
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import { S } from "deka-dom-el/signals";
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/**
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* Task Manager Component
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* @returns {HTMLElement} Task manager UI
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*/
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export function TaskManager() {
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// Local storage key
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const STORAGE_KEY = 'dde-task-manager';
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// Task statuses
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const STATUSES = {
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TODO: 'todo',
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IN_PROGRESS: 'in-progress',
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DONE: 'done'
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};
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// Initial tasks from localStorage or defaults
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let initialTasks = [];
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try {
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const saved = localStorage.getItem(STORAGE_KEY);
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if (saved) {
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initialTasks = JSON.parse(saved);
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}
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} catch (e) {
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console.error('Failed to load tasks from localStorage', e);
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}
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if (!initialTasks.length) {
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// Default tasks if nothing in localStorage
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initialTasks = [
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{ id: 1, title: 'Create project structure', description: 'Set up folders and initial files',
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status: STATUSES.DONE, priority: 'high' },
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{ id: 2, title: 'Design UI components', description: 'Create mockups for main views',
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status: STATUSES.IN_PROGRESS, priority: 'medium' },
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{ id: 3, title: 'Implement authentication', description: 'Set up user login and registration',
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status: STATUSES.TODO, priority: 'high' },
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{ id: 4, title: 'Write documentation', description: 'Document API endpoints and usage examples',
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status: STATUSES.TODO, priority: 'low' },
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];
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}
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// Application state
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const tasks = S(initialTasks, {
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add(task) { this.value.push(task); },
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remove(id) { this.value = this.value.filter(task => task.id !== id); },
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update(id, task) {
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const current= this.value.find(t => t.id === id);
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if (current) Object.assign(current, task);
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// TODO: known bug for derived signals (the object is the same)
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// so filteredTasks is not updated, hotfix ↙
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this.value = structuredClone(this.value);
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}
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});
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const newTaskTitle = S('');
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const newTaskDescription = S('');
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const newTaskPriority = S('medium');
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const editingTaskId = S(null);
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const draggedTaskId = S(null);
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const filterPriority = S('all');
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const searchQuery = S('');
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// Save tasks to localStorage whenever they change
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S.on(tasks, value => {
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try {
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localStorage.setItem(STORAGE_KEY, JSON.stringify(value));
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} catch (e) {
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console.error('Failed to save tasks to localStorage', e);
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}
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});
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// Filtered tasks based on priority and search query
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const filteredTasks = S(() => {
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let filtered = tasks.get();
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// Filter by priority
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if (filterPriority.get() !== 'all') {
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filtered = filtered.filter(task => task.priority === filterPriority.get());
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}
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// Filter by search query
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const query = searchQuery.get().toLowerCase();
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if (query) {
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filtered = filtered.filter(task =>
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task.title.toLowerCase().includes(query) ||
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task.description.toLowerCase().includes(query)
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);
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}
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return filtered;
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});
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// Tasks grouped by status for display in columns
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const tasksByStatus = S(() => {
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const filtered = filteredTasks.get();
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return {
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[STATUSES.TODO]: filtered.filter(t => t.status === STATUSES.TODO),
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[STATUSES.IN_PROGRESS]: filtered.filter(t => t.status === STATUSES.IN_PROGRESS),
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[STATUSES.DONE]: filtered.filter(t => t.status === STATUSES.DONE)
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};
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});
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// Event handlers
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const onAddTask = e => {
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e.preventDefault();
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const title = newTaskTitle.get().trim();
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if (!title) return;
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const newTask = {
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id: Date.now(),
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title,
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description: newTaskDescription.get().trim(),
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status: STATUSES.TODO,
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priority: newTaskPriority.get()
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};
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S.action(tasks, "add", newTask);
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newTaskTitle.set('');
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newTaskDescription.set('');
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newTaskPriority.set('medium');
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};
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const onDeleteTask = id => e => {
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e.stopPropagation();
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S.action(tasks, "remove", id);
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};
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const onEditStart = id => () => {
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editingTaskId.set(id);
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};
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const onEditCancel = () => {
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editingTaskId.set(null);
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};
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const onEditSave = id => e => {
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e.preventDefault();
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const form = e.target;
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const title = form.elements.title.value.trim();
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if (!title) return;
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tasks.set(tasks.get().map(task =>
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task.id === id
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? {
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...task,
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title,
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description: form.elements.description.value.trim(),
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priority: form.elements.priority.value
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}
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: task
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));
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editingTaskId.set(null);
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};
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function onDragable(id) {
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return element => {
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on("dragstart", e => {
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draggedTaskId.set(id);
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e.dataTransfer.effectAllowed = 'move';
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// Add some styling to the element being dragged
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setTimeout(() => {
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const el = document.getElementById(`task-${id}`);
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if (el) el.classList.add('dragging');
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}, 0);
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})(element);
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on("dragend", () => {
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draggedTaskId.set(null);
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// Remove the styling
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const el = document.getElementById(`task-${id}`);
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if (el) el.classList.remove('dragging');
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})(element);
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};
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}
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function onDragArea(status) {
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return element => {
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on("dragover", e => {
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e.preventDefault();
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e.dataTransfer.dropEffect = 'move';
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// Add a visual indicator for the drop target
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const column = document.getElementById(`column-${status}`);
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if (column) column.classList.add('drag-over');
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})(element);
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on("dragleave", () => {
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// Remove the visual indicator
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const column = document.getElementById(`column-${status}`);
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if (column) column.classList.remove('drag-over');
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})(element);
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on("drop", e => {
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e.preventDefault();
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const id = draggedTaskId.get();
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if (id) S.action(tasks, "update", id, { status });
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// Remove the visual indicator
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const column = document.getElementById(`column-${status}`);
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if (column) column.classList.remove('drag-over');
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})(element);
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};
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}
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// Helper function to render a task card
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function renderTaskCard(task) {
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const isEditing = S(() => editingTaskId.get() === task.id);
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return el("div", {
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id: `task-${task.id}`,
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className: `task-card priority-${task.priority}`,
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draggable: true
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}, onDragable(task.id)).append(
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S.el(isEditing, editing => editing
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// Edit mode
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? el("form", { className: "task-edit-form" }, on("submit", onEditSave(task.id))).append(
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el("input", {
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name: "title",
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className: "task-title-input",
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defaultValue: task.title,
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placeholder: "Task title",
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required: true,
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autoFocus: true
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}),
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el("textarea", {
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name: "description",
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className: "task-desc-input",
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defaultValue: task.description,
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placeholder: "Description (optional)"
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}),
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el("select", {
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name: "priority",
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}, on.host(el=> el.value = task.priority)).append(
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el("option", { value: "low", textContent: "Low Priority" }),
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el("option", { value: "medium", textContent: "Medium Priority" }),
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el("option", { value: "high", textContent: "High Priority" })
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),
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el("div", { className: "task-edit-actions" }).append(
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el("button", {
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type: "button",
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className: "cancel-btn"
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}, on("click", onEditCancel)).append("Cancel"),
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el("button", {
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type: "submit",
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className: "save-btn"
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}).append("Save")
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)
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)
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// View mode
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: el().append(
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el("div", { className: "task-header" }).append(
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el("h3", { className: "task-title", textContent: task.title }),
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el("div", { className: "task-actions" }).append(
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el("button", {
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className: "edit-btn",
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"aria-label": "Edit task"
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}, on("click", onEditStart(task.id))).append("✎"),
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el("button", {
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className: "delete-btn",
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"aria-label": "Delete task"
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}, on("click", onDeleteTask(task.id))).append("×")
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)
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),
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task.description
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? el("p", { className: "task-description", textContent: task.description })
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: el(),
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el("div", { className: "task-meta" }).append(
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el("span", {
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className: `priority-badge priority-${task.priority}`,
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textContent: task.priority.charAt(0).toUpperCase() + task.priority.slice(1)
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})
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)
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)
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)
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);
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}
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// Build the task manager UI
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return el("div", { className: "task-manager" }).append(
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el("header", { className: "app-header" }).append(
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el("h1", "DDE Task Manager"),
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el("div", { className: "app-controls" }).append(
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el("input", {
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type: "text",
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placeholder: "Search tasks...",
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value: searchQuery.get()
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}, on("input", e => searchQuery.set(e.target.value))),
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el("select", null,
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on.host(el=> el.value= filterPriority.get()),
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on("change", e => filterPriority.set(e.target.value))
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).append(
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el("option", { value: "all", textContent: "All Priorities" }),
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el("option", { value: "low", textContent: "Low Priority" }),
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el("option", { value: "medium", textContent: "Medium Priority" }),
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el("option", { value: "high", textContent: "High Priority" })
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)
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)
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),
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// Add new task form
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el("form", { className: "new-task-form" }, on("submit", onAddTask)).append(
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el("div", { className: "form-row" }).append(
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el("input", {
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type: "text",
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placeholder: "New task title",
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value: newTaskTitle.get(),
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required: true
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}, on("input", e => newTaskTitle.set(e.target.value))),
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el("select", null,
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on.host(el=> el.value= newTaskPriority.get()),
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on("change", e => newTaskPriority.set(e.target.value))
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).append(
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el("option", { value: "low", textContent: "Low" }),
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el("option", { value: "medium", textContent: "Medium" }),
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el("option", { value: "high", textContent: "High" })
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),
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el("button", { type: "submit", className: "add-btn" }).append("Add Task")
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),
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el("textarea", {
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placeholder: "Task description (optional)",
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value: newTaskDescription.get()
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}, on("input", e => newTaskDescription.set(e.target.value)))
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),
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// Task board with columns
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el("div", { className: "task-board" }).append(
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// Todo column
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el("div", {
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id: `column-${STATUSES.TODO}`,
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className: "task-column"
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}, onDragArea(STATUSES.TODO)).append(
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el("h2", { className: "column-header" }).append(
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"To Do ",
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el("span", { className: "task-count" }).append(
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S(() => tasksByStatus.get()[STATUSES.TODO].length)
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)
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),
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S.el(S(() => tasksByStatus.get()[STATUSES.TODO]), tasks =>
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el("div", { className: "column-tasks" }).append(
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...tasks.map(renderTaskCard)
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)
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)
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),
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// In Progress column
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el("div", {
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id: `column-${STATUSES.IN_PROGRESS}`,
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className: "task-column"
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}, onDragArea(STATUSES.IN_PROGRESS)).append(
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el("h2", { className: "column-header" }).append(
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"In Progress ",
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el("span", { className: "task-count" }).append(
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S(() => tasksByStatus.get()[STATUSES.IN_PROGRESS].length)
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)
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),
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S.el(S(() => tasksByStatus.get()[STATUSES.IN_PROGRESS]), tasks =>
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el("div", { className: "column-tasks" }).append(
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...tasks.map(renderTaskCard)
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)
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)
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),
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// Done column
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el("div", {
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id: `column-${STATUSES.DONE}`,
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className: "task-column"
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}, onDragArea(STATUSES.DONE)).append(
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el("h2", { className: "column-header" }).append(
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"Done ",
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el("span", { className: "task-count" }).append(
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S(() => tasksByStatus.get()[STATUSES.DONE].length)
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)
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),
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S.el(S(() => tasksByStatus.get()[STATUSES.DONE]), tasks =>
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el("div", { className: "column-tasks" }).append(
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...tasks.map(renderTaskCard)
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)
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)
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)
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),
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);
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}
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// Render the component
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document.body.append(
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el("div", { style: "padding: 20px; background: #f5f5f5; min-height: 100vh;" }).append(
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el(TaskManager)
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),
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el("style", `
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.task-manager {
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font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
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max-width: 1200px;
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margin: 0 auto;
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padding: 1rem;
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color: #333;
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}
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.app-header {
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display: flex;
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justify-content: space-between;
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align-items: center;
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margin-bottom: 1.5rem;
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flex-wrap: wrap;
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gap: 1rem;
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}
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.app-header h1 {
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margin: 0;
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color: #2d3748;
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}
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.app-controls {
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display: flex;
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gap: 1rem;
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}
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.app-controls input,
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.app-controls select {
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padding: 0.5rem;
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border: 1px solid #e2e8f0;
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border-radius: 4px;
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font-size: 0.9rem;
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}
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.new-task-form {
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background: white;
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padding: 1.5rem;
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border-radius: 8px;
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box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
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margin-bottom: 2rem;
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}
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.form-row {
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display: flex;
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gap: 1rem;
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margin-bottom: 1rem;
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}
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.form-row input {
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flex-grow: 1;
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padding: 0.75rem;
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border: 1px solid #e2e8f0;
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border-radius: 4px;
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font-size: 1rem;
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}
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.form-row select {
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width: 100px;
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padding: 0.75rem;
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border: 1px solid #e2e8f0;
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border-radius: 4px;
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font-size: 1rem;
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}
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.add-btn {
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background: #4a90e2;
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color: white;
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border: none;
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border-radius: 4px;
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padding: 0.75rem 1.5rem;
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font-size: 1rem;
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cursor: pointer;
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transition: background 0.2s ease;
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}
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.add-btn:hover {
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background: #3a7bc8;
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}
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.new-task-form textarea {
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width: 100%;
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padding: 0.75rem;
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border: 1px solid #e2e8f0;
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border-radius: 4px;
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font-size: 1rem;
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resize: vertical;
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min-height: 80px;
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}
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.task-board {
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display: grid;
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grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
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gap: 1.5rem;
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}
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.task-column {
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background: #f7fafc;
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border-radius: 8px;
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padding: 1rem;
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min-height: 400px;
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transition: background 0.2s ease;
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}
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.column-header {
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margin-top: 0;
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padding-bottom: 0.75rem;
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border-bottom: 2px solid #e2e8f0;
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font-size: 1.25rem;
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color: #2d3748;
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display: flex;
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align-items: center;
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}
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.task-count {
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display: inline-flex;
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justify-content: center;
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align-items: center;
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background: #e2e8f0;
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color: #4a5568;
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border-radius: 50%;
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width: 25px;
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height: 25px;
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font-size: 0.875rem;
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margin-left: 0.5rem;
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}
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.column-tasks {
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margin-top: 1rem;
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display: flex;
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flex-direction: column;
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gap: 1rem;
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min-height: 200px;
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}
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.task-card {
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background: white;
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border-radius: 6px;
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padding: 1rem;
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box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
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cursor: grab;
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transition: transform 0.2s ease, box-shadow 0.2s ease;
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position: relative;
|
||
border-left: 4px solid #ccc;
|
||
}
|
||
|
||
.task-card:hover {
|
||
transform: translateY(-3px);
|
||
box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
|
||
}
|
||
|
||
.task-card.dragging {
|
||
opacity: 0.5;
|
||
cursor: grabbing;
|
||
}
|
||
|
||
.task-card.priority-low {
|
||
border-left-color: #38b2ac;
|
||
}
|
||
|
||
.task-card.priority-medium {
|
||
border-left-color: #ecc94b;
|
||
}
|
||
|
||
.task-card.priority-high {
|
||
border-left-color: #e53e3e;
|
||
}
|
||
|
||
.task-header {
|
||
display: flex;
|
||
justify-content: space-between;
|
||
align-items: flex-start;
|
||
margin-bottom: 0.5rem;
|
||
}
|
||
|
||
.task-title {
|
||
margin: 0;
|
||
font-size: 1.1rem;
|
||
color: #2d3748;
|
||
word-break: break-word;
|
||
}
|
||
|
||
.task-description {
|
||
margin: 0.5rem 0;
|
||
font-size: 0.9rem;
|
||
color: #4a5568;
|
||
word-break: break-word;
|
||
}
|
||
|
||
.task-actions {
|
||
display: flex;
|
||
gap: 0.5rem;
|
||
}
|
||
|
||
.edit-btn,
|
||
.delete-btn {
|
||
background: none;
|
||
border: none;
|
||
font-size: 1rem;
|
||
cursor: pointer;
|
||
width: 24px;
|
||
height: 24px;
|
||
display: inline-flex;
|
||
justify-content: center;
|
||
align-items: center;
|
||
border-radius: 50%;
|
||
color: #718096;
|
||
transition: background 0.2s ease, color 0.2s ease;
|
||
}
|
||
|
||
.edit-btn:hover {
|
||
background: #edf2f7;
|
||
color: #4a5568;
|
||
}
|
||
|
||
.delete-btn:hover {
|
||
background: #fed7d7;
|
||
color: #e53e3e;
|
||
}
|
||
|
||
.task-meta {
|
||
display: flex;
|
||
justify-content: space-between;
|
||
align-items: center;
|
||
margin-top: 0.75rem;
|
||
}
|
||
|
||
.priority-badge {
|
||
font-size: 0.75rem;
|
||
padding: 0.2rem 0.5rem;
|
||
border-radius: 4px;
|
||
font-weight: 500;
|
||
}
|
||
|
||
.priority-badge.priority-low {
|
||
background: #e6fffa;
|
||
color: #2c7a7b;
|
||
}
|
||
|
||
.priority-badge.priority-medium {
|
||
background: #fefcbf;
|
||
color: #975a16;
|
||
}
|
||
|
||
.priority-badge.priority-high {
|
||
background: #fed7d7;
|
||
color: #c53030;
|
||
}
|
||
|
||
.drag-over {
|
||
background: #f0f9ff;
|
||
border: 2px dashed #4a90e2;
|
||
}
|
||
|
||
.task-edit-form {
|
||
display: flex;
|
||
flex-direction: column;
|
||
gap: 0.75rem;
|
||
}
|
||
|
||
.task-title-input,
|
||
.task-desc-input {
|
||
width: 100%;
|
||
padding: 0.5rem;
|
||
border: 1px solid #e2e8f0;
|
||
border-radius: 4px;
|
||
font-size: 0.9rem;
|
||
}
|
||
|
||
.task-desc-input {
|
||
min-height: 60px;
|
||
resize: vertical;
|
||
}
|
||
|
||
.task-edit-actions {
|
||
display: flex;
|
||
justify-content: flex-end;
|
||
gap: 0.5rem;
|
||
margin-top: 0.5rem;
|
||
}
|
||
|
||
.cancel-btn,
|
||
.save-btn {
|
||
padding: 0.4rem 0.75rem;
|
||
border-radius: 4px;
|
||
font-size: 0.9rem;
|
||
cursor: pointer;
|
||
}
|
||
|
||
.cancel-btn {
|
||
background: #edf2f7;
|
||
color: #4a5568;
|
||
border: 1px solid #e2e8f0;
|
||
}
|
||
|
||
.save-btn {
|
||
background: #4a90e2;
|
||
color: white;
|
||
border: none;
|
||
}
|
||
|
||
@media (max-width: 768px) {
|
||
.app-header {
|
||
flex-direction: column;
|
||
align-items: flex-start;
|
||
}
|
||
|
||
.app-controls {
|
||
width: 100%;
|
||
flex-direction: column;
|
||
}
|
||
|
||
.form-row {
|
||
flex-direction: column;
|
||
}
|
||
|
||
.task-board {
|
||
grid-template-columns: 1fr;
|
||
}
|
||
}
|
||
`)
|
||
);
|