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https://github.com/jaandrle/deka-dom-el
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🔤 Examples
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394
docs/components/examples/case-studies/data-dashboard.js
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394
docs/components/examples/case-studies/data-dashboard.js
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/**
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* Case Study: Data Dashboard with Charts
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*
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* This example demonstrates:
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* - Integration with a third-party charting library
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* - Data fetching and state management
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* - Responsive layout design
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* - Multiple interactive components working together
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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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* Data Dashboard Component with Chart Integration
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* @returns {HTMLElement} Dashboard element
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*/
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export function DataDashboard() {
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// Mock data for demonstration
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const DATA = {
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sales: [42, 58, 65, 49, 72, 85, 63, 70, 78, 89, 95, 86],
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visitors: [1420, 1620, 1750, 1850, 2100, 2400, 2250, 2500, 2750, 2900, 3100, 3200],
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conversion: [2.9, 3.5, 3.7, 2.6, 3.4, 3.5, 2.8, 2.8, 2.8, 3.1, 3.0, 2.7],
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months: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
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};
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// Application state
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const selectedYear = S(2024);
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const selectedDataType = S(/** @type {'sales' | 'visitors' | 'conversion'} */ ('sales'));
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const isLoading = S(false);
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const error = S(null);
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// Filter options
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const years = [2022, 2023, 2024];
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const dataTypes = [
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{ id: 'sales', label: 'Sales', unit: 'K' },
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{ id: 'visitors', label: 'Visitors', unit: '' },
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{ id: 'conversion', label: 'Conversion Rate', unit: '%' }
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];
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// Computed values
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const selectedData = S(() => {
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return DATA[selectedDataType.get()];
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});
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const currentDataType = S(() => {
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return dataTypes.find(type => type.id === selectedDataType.get());
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});
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const totalValue = S(() => {
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const data = selectedData.get();
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return data.reduce((sum, value) => sum + value, 0);
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});
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const averageValue = S(() => {
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const data = selectedData.get();
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return data.reduce((sum, value) => sum + value, 0) / data.length;
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});
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const highestValue = S(() => {
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return Math.max(...selectedData.get());
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});
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// Event handlers
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const onYearChange = on("change", e => {
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selectedYear.set(parseInt(/** @type {HTMLSelectElement} */(e.target).value));
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loadData();
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});
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const onDataTypeChange = on("click", e => {
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const type = /** @type {'sales' | 'visitors' | 'conversion'} */(
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/** @type {HTMLButtonElement} */(e.currentTarget).dataset.type);
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selectedDataType.set(type);
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});
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// Simulate data loading
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function loadData() {
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isLoading.set(true);
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error.set(null);
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// Simulate API call
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setTimeout(() => {
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if (Math.random() > 0.9) {
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// Simulate occasional error
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error.set('Failed to load data. Please try again.');
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}
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isLoading.set(false);
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}, 800);
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}
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// Reactive chart rendering
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const chart = S(()=> {
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const chart= el("canvas", { id: "chart-canvas", width: 800, height: 400 });
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const ctx = chart.getContext('2d');
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const data = selectedData.get();
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const months = DATA.months;
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const width = chart.width;
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const height = chart.height;
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const maxValue = Math.max(...data) * 1.1;
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const barWidth = width / data.length - 10;
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// Clear canvas
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ctx.clearRect(0, 0, width, height);
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// Draw background grid
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ctx.beginPath();
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ctx.strokeStyle = '#f0f0f0';
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ctx.lineWidth = 1;
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for(let i = 0; i < 5; i++) {
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const y = height - (height * (i / 5)) - 30;
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ctx.moveTo(50, y);
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ctx.lineTo(width - 20, y);
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// Draw grid labels
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ctx.fillStyle = '#999';
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ctx.font = '12px Arial';
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ctx.fillText(Math.round(maxValue * (i / 5)), 20, y + 5);
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}
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ctx.stroke();
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// Draw bars
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data.forEach((value, index) => {
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const x = index * (barWidth + 10) + 60;
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const barHeight = (value / maxValue) * (height - 60);
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// Bar
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ctx.fillStyle = '#4a90e2';
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ctx.fillRect(x, height - barHeight - 30, barWidth, barHeight);
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// Month label
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ctx.fillStyle = '#666';
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ctx.font = '12px Arial';
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ctx.fillText(months[index], x + barWidth/2 - 10, height - 10);
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});
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// Chart title
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ctx.fillStyle = '#333';
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ctx.font = 'bold 14px Arial';
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ctx.fillText(`${currentDataType.get().label} (${selectedYear.get()})`, width/2 - 80, 20);
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return chart;
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});
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return el("div", { className: "dashboard" }).append(
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el("header", { className: "dashboard-header" }).append(
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el("h1", "Sales Performance Dashboard"),
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el("div", { className: "year-filter" }).append(
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el("label", { htmlFor: "yearSelect", textContent: "Select Year:" }),
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el("select", { id: "yearSelect" },
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on.host(el=> el.value = selectedYear.get().toString()),
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onYearChange
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).append(
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...years.map(year => el("option", { value: year, textContent: year }))
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)
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)
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),
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// Error message (only shown when there's an error)
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S.el(error, errorMsg => !errorMsg
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? el()
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: el("div", { className: "error-message" }).append(
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el("p", errorMsg),
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el("button", { textContent: "Retry", type: "button" }, on("click", loadData)),
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),
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),
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// Loading indicator
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S.el(isLoading, loading => !loading
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? el()
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: el("div", { className: "loading-spinner" })
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),
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// Main dashboard content
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el("div", { className: "dashboard-content" }).append(
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// Metrics cards
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el("div", { className: "metrics-container" }).append(
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el("div", { className: "metric-card" }).append(
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el("h3", "Total"),
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el("#text", S(() => `${totalValue.get().toLocaleString()}${currentDataType.get().unit}`)),
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),
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el("div", { className: "metric-card" }).append(
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el("h3", "Average"),
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el("#text", S(() => `${averageValue.get().toFixed(1)}${currentDataType.get().unit}`)),
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),
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el("div", { className: "metric-card" }).append(
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el("h3", "Highest"),
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el("#text", S(() => `${highestValue.get()}${currentDataType.get().unit}`)),
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),
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),
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// Data type selection tabs
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el("div", { className: "data-type-tabs" }).append(
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...dataTypes.map(type =>
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el("button", {
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type: "button",
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className: S(() => selectedDataType.get() === type.id ? 'active' : ''),
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dataType: type.id,
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textContent: type.label
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}, onDataTypeChange)
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)
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),
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// Chart container
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el("div", { className: "chart-container" }).append(
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S.el(chart, chart => chart)
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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(DataDashboard)
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),
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el("style", `
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.dashboard {
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font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
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max-width: 1000px;
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margin: 0 auto;
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padding: 1rem;
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background: #fff;
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box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
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border-radius: 8px;
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}
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.dashboard-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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padding-bottom: 1rem;
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border-bottom: 1px solid #eee;
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}
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.dashboard-header h1 {
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font-size: 1.5rem;
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margin: 0;
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color: #333;
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}
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.year-filter {
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display: flex;
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align-items: center;
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gap: 0.5rem;
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}
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.year-filter select {
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padding: 0.5rem;
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border: 1px solid #ddd;
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border-radius: 4px;
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font-size: 1rem;
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}
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.metrics-container {
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display: grid;
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grid-template-columns: repeat(3, 1fr);
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gap: 1rem;
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margin-bottom: 1.5rem;
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}
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.metric-card {
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background: #f9f9f9;
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border-radius: 8px;
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padding: 1rem;
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text-align: center;
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transition: transform 0.2s ease;
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}
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.metric-card:hover {
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transform: translateY(-5px);
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box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
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}
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.metric-card h3 {
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margin-top: 0;
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color: #666;
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font-size: 0.9rem;
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margin-bottom: 0.5rem;
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}
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.metric-card p {
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font-size: 1.5rem;
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font-weight: bold;
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color: #333;
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margin: 0;
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}
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.data-type-tabs {
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display: flex;
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border-bottom: 1px solid #eee;
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margin-bottom: 1.5rem;
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}
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.data-type-tabs button {
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background: none;
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border: none;
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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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color: #666;
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position: relative;
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}
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.data-type-tabs button.active {
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color: #4a90e2;
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font-weight: 500;
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}
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.data-type-tabs button.active::after {
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content: '';
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position: absolute;
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bottom: -1px;
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left: 0;
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width: 100%;
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height: 3px;
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background: #4a90e2;
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border-radius: 3px 3px 0 0;
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}
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.chart-container {
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background: #fff;
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border-radius: 8px;
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padding: 1rem;
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margin-bottom: 1.5rem;
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box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
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}
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.loading-spinner {
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display: flex;
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justify-content: center;
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align-items: center;
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height: 100px;
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}
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.loading-spinner::before {
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content: '';
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width: 40px;
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height: 40px;
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border: 4px solid #f3f3f3;
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border-top: 4px solid #4a90e2;
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border-radius: 50%;
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animation: spin 1s linear infinite;
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}
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@keyframes spin {
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0% { transform: rotate(0deg); }
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100% { transform: rotate(360deg); }
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}
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.error-message {
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background: #ffecec;
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color: #e74c3c;
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padding: 1rem;
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border-radius: 4px;
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margin-bottom: 1.5rem;
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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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}
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.error-message p {
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margin: 0;
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}
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.error-message button {
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background: #e74c3c;
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color: white;
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border: none;
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border-radius: 4px;
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padding: 0.5rem 1rem;
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cursor: pointer;
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}
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@media (max-width: 768px) {
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.metrics-container {
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grid-template-columns: 1fr;
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}
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.dashboard-header {
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flex-direction: column;
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align-items: flex-start;
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gap: 1rem;
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}
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.year-filter {
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width: 100%;
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}
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.year-filter select {
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flex-grow: 1;
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}
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}
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`)
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);
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