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/**
* Chart Component
* Wrapper for Chart.js with common configurations
*/
// Chart.js will be loaded from CDN in pages that need it
export class ChartComponent {
constructor(canvasId, type = 'line', options = {}) {
this.canvasId = canvasId;
this.canvas = document.getElementById(canvasId);
this.type = type;
this.options = options;
this.chart = null;
if (!this.canvas) {
console.error(`[Chart] Canvas not found: ${canvasId}`);
}
}
/**
* Create chart with data
*/
async create(data, customOptions = {}) {
if (!this.canvas) return;
// Ensure Chart.js is loaded
if (typeof Chart === 'undefined') {
console.error('[Chart] Chart.js not loaded');
return;
}
// Destroy existing chart
this.destroy();
const config = {
type: this.type,
data: data,
options: {
responsive: true,
maintainAspectRatio: false,
...this.getDefaultOptions(this.type),
...this.options,
...customOptions,
},
};
this.chart = new Chart(this.canvas, config);
}
/**
* Update chart data
*/
update(data) {
if (!this.chart) {
console.warn('[Chart] Chart not initialized');
return;
}
this.chart.data = data;
this.chart.update();
}
/**
* Destroy chart
*/
destroy() {
if (this.chart) {
this.chart.destroy();
this.chart = null;
}
}
/**
* Get default options by chart type
*/
getDefaultOptions(type) {
const common = {
plugins: {
legend: {
display: true,
position: 'top',
labels: {
color: 'var(--text-normal)',
font: {
family: 'var(--font-family-base)',
},
},
},
tooltip: {
backgroundColor: 'var(--surface-glass)',
titleColor: 'var(--text-strong)',
bodyColor: 'var(--text-normal)',
borderColor: 'var(--border-default)',
borderWidth: 1,
},
},
};
const typeDefaults = {
line: {
scales: {
x: {
grid: {
color: 'var(--border-subtle)',
},
ticks: {
color: 'var(--text-soft)',
},
},
y: {
grid: {
color: 'var(--border-subtle)',
},
ticks: {
color: 'var(--text-soft)',
},
},
},
},
bar: {
scales: {
x: {
grid: {
display: false,
},
ticks: {
color: 'var(--text-soft)',
},
},
y: {
grid: {
color: 'var(--border-subtle)',
},
ticks: {
color: 'var(--text-soft)',
},
},
},
},
doughnut: {
plugins: {
legend: {
position: 'right',
},
},
},
};
return {
...common,
...(typeDefaults[type] || {}),
};
}
}
/**
* Load Chart.js from CDN if not already loaded
*/
export async function loadChartJS() {
if (typeof Chart !== 'undefined') {
return Promise.resolve();
}
return new Promise((resolve, reject) => {
const script = document.createElement('script');
script.src = 'https://cdn.jsdelivr.net/npm/chart.js@4/dist/chart.umd.min.js';
script.onload = () => {
console.log('[Chart] Chart.js loaded from CDN');
resolve();
};
script.onerror = () => {
console.error('[Chart] Failed to load Chart.js');
reject(new Error('Failed to load Chart.js'));
};
document.head.appendChild(script);
});
}
export default ChartComponent;
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