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/* Waterfall Chart — frontend.js (Chart.js floating bars) */ |
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(function () { |
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'use strict'; |
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|
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var CHARTJS_CDN = 'https://cdn.jsdelivr.net/npm/chart.js@4.4.3/dist/chart.umd.min.js'; |
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|
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function loadChartJs(cb) { |
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if (window.Chart) { cb(); return; } |
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var s = document.createElement('script'); |
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s.src = CHARTJS_CDN; |
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s.onload = cb; |
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document.head.appendChild(s); |
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} |
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|
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function hexToRgb(hex) { |
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var r = parseInt((hex || '#000000').slice(1, 3), 16); |
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var g = parseInt((hex || '#000000').slice(3, 5), 16); |
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var b = parseInt((hex || '#000000').slice(5, 7), 16); |
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return r + ',' + g + ',' + b; |
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} |
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|
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function abbr(n, prefix, suffix, doAbbr) { |
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var abs = Math.abs(n); |
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var sign = n < 0 ? '-' : ''; |
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var str; |
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if (!doAbbr || abs < 1000) { |
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str = abs.toLocaleString(); |
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} else if (abs < 1000000) { |
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str = (abs / 1000).toFixed(1).replace(/\.0$/, '') + 'K'; |
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} else if (abs < 1000000000) { |
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str = (abs / 1000000).toFixed(1).replace(/\.0$/, '') + 'M'; |
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} else { |
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str = (abs / 1000000000).toFixed(1).replace(/\.0$/, '') + 'B'; |
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} |
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return sign + prefix + str + suffix; |
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} |
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|
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function typeColor(type, o) { |
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if (type === 'start') return o.startColor; |
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if (type === 'increase') return o.increaseColor; |
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if (type === 'decrease') return o.decreaseColor; |
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return o.totalColor; |
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} |
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|
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/* Compute [base, top] for each bar */ |
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function computeFloats(items, o) { |
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var running = 0; |
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return items.map(function (item) { |
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var v = parseFloat(item.value) || 0; |
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var type = item.type || 'increase'; |
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var base, top; |
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|
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if (type === 'start') { |
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base = 0; top = v; running = v; |
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} else if (type === 'total') { |
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base = 0; top = running; |
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} else if (type === 'increase') { |
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base = running; top = running + v; running = top; |
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} else { /* decrease */ |
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top = running; base = running + v; running = base; |
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} |
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|
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return { |
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label: item.label, |
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type: type, |
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floatY: [Math.min(base, top), Math.max(base, top)], |
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displayValue: v, |
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barColor: typeColor(type, o), |
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running: running |
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}; |
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}); |
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} |
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|
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function initChart(appEl, o) { |
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var wrap = document.createElement('div'); |
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wrap.className = 'bkbg-wfc-wrap'; |
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wrap.style.background = o.bgColor; |
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wrap.style.borderRadius = '10px'; |
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wrap.style.padding = (o.paddingTop || 24) + 'px 24px ' + (o.paddingBottom || 24) + 'px'; |
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wrap.style.maxWidth = o.maxWidth + 'px'; |
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wrap.style.margin = '0 auto'; |
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|
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if (o.showTitle && o.title) { |
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var titleEl = document.createElement('div'); |
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titleEl.className = 'bkbg-wfc-title'; |
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titleEl.textContent = o.title; |
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titleEl.style.color = o.titleColor; |
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wrap.appendChild(titleEl); |
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} |
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|
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var canvasWrap = document.createElement('div'); |
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canvasWrap.className = 'bkbg-wfc-canvas-wrap'; |
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canvasWrap.style.height = o.height + 'px'; |
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|
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var canvas = document.createElement('canvas'); |
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canvas.style.width = '100%'; |
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canvas.style.height = '100%'; |
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canvasWrap.appendChild(canvas); |
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wrap.appendChild(canvasWrap); |
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|
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/* tooltip */ |
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var tooltip = document.createElement('div'); |
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tooltip.className = 'bkbg-wfc-tooltip'; |
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canvasWrap.appendChild(tooltip); |
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|
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/* legend */ |
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if (o.showLegend) { |
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var legend = document.createElement('div'); |
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legend.className = 'bkbg-wfc-legend'; |
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|
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var legendItems = [ |
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{ type: 'start', label: 'Start', color: o.startColor }, |
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{ type: 'increase', label: 'Increase', color: o.increaseColor }, |
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{ type: 'decrease', label: 'Decrease', color: o.decreaseColor }, |
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{ type: 'total', label: 'Total', color: o.totalColor } |
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]; |
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legendItems.forEach(function (li) { |
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var item = document.createElement('div'); |
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item.className = 'bkbg-wfc-legend-item'; |
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item.style.color = o.labelColor; |
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|
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var dot = document.createElement('span'); |
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dot.className = 'bkbg-wfc-legend-dot'; |
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dot.style.background = li.color; |
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|
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var lbl = document.createElement('span'); |
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lbl.textContent = li.label; |
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|
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item.appendChild(dot); |
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item.appendChild(lbl); |
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legend.appendChild(item); |
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}); |
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wrap.appendChild(legend); |
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} |
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|
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appEl.parentNode.insertBefore(wrap, appEl); |
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appEl.style.display = 'none'; |
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|
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loadChartJs(function () { |
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var segs = computeFloats(o.items || [], o); |
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|
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var labels = segs.map(function (s) { return s.label; }); |
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var floatData = segs.map(function (s) { return s.floatY; }); |
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var barColors = segs.map(function (s) { return 'rgba(' + hexToRgb(s.barColor) + ',0.88)'; }); |
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var barColorsBorder = segs.map(function (s) { return s.barColor; }); |
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var displayValues = segs.map(function (s) { return s.displayValue; }); |
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|
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/* Connector lines via custom plugin */ |
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var bR = o.borderRadius || 0; |
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|
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var connectorPlugin = { |
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id: 'bkbg-wfc-connectors', |
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afterDatasetsDraw: function (chart) { |
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if (!o.showConnectors) return; |
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var ctx = chart.ctx; |
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var meta = chart.getDatasetMeta(0); |
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ctx.save(); |
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ctx.strokeStyle = o.connectorColor || '#9ca3af'; |
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ctx.lineWidth = 1.5; |
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ctx.setLineDash([5, 4]); |
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|
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for (var i = 0; i < meta.data.length - 1; i++) { |
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var curr = meta.data[i]; |
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var next = meta.data[i + 1]; |
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if (!curr || !next) continue; |
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var seg = segs[i]; |
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/* connect from top of current to top of next start */ |
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var connY = seg.type === 'decrease' |
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? chart.scales.y.getPixelForValue(seg.floatY[1]) |
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: chart.scales.y.getPixelForValue(seg.floatY[1]); |
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|
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ctx.beginPath(); |
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ctx.moveTo(curr.x + curr.width / 2, connY); |
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ctx.lineTo(next.x - next.width / 2, connY); |
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ctx.stroke(); |
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} |
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ctx.restore(); |
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} |
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}; |
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|
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new window.Chart(canvas, { |
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type: 'bar', |
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plugins: [connectorPlugin], |
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data: { |
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labels: labels, |
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datasets: [{ |
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data: floatData, |
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backgroundColor: barColors, |
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borderColor: barColorsBorder, |
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borderWidth: 0, |
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borderRadius: bR, |
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borderSkipped: false, |
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barThickness: o.barThickness || 48 |
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}] |
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}, |
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options: { |
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responsive: true, |
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maintainAspectRatio: false, |
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plugins: { |
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legend: { display: false }, |
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tooltip: { |
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enabled: false, |
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external: function (context) { |
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var tooltipModel = context.tooltip; |
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if (!tooltipModel || tooltipModel.opacity === 0) { |
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tooltip.classList.remove('is-visible'); |
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return; |
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} |
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var idx = tooltipModel.dataPoints[0].dataIndex; |
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var seg = segs[idx]; |
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tooltip.innerHTML = |
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'<div class="bkbg-wfc-tooltip-label">' + (seg.label || '') + '</div>' + |
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'<div class="bkbg-wfc-tooltip-value">' + abbr(seg.displayValue, o.valuePrefix || '', o.valueSuffix || '', o.abbreviate !== false) + '</div>'; |
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tooltip.style.left = tooltipModel.caretX + 'px'; |
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tooltip.style.top = (tooltipModel.caretY - 60) + 'px'; |
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tooltip.classList.add('is-visible'); |
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} |
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}, |
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datalabels: { display: false } |
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}, |
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scales: { |
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x: { |
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grid: { display: false }, |
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ticks: { |
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color: o.labelColor || '#6b7280', |
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font: { size: o.labelSize || 12 } |
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}, |
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border: { display: false } |
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}, |
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y: { |
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grid: { |
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display: o.showGrid !== false, |
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color: o.gridColor || '#e5e7eb' |
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}, |
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ticks: { |
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color: o.labelColor || '#6b7280', |
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font: { size: o.labelSize || 12 }, |
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callback: function (v) { |
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return abbr(v, o.valuePrefix || '', o.valueSuffix || '', o.abbreviate !== false); |
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} |
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}, |
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border: { display: false } |
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} |
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} |
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} |
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}); |
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|
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/* Data labels on top of bars when showDataLabels is enabled */ |
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if (o.showDataLabels) { |
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var chartInstance = window.Chart.getChart(canvas); |
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if (!chartInstance) return; |
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var originalDraw = chartInstance.draw.bind(chartInstance); |
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chartInstance.draw = function () { |
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originalDraw(); |
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var ctx2 = canvas.getContext('2d'); |
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var meta2 = chartInstance.getDatasetMeta(0); |
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ctx2.save(); |
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ctx2.font = 'bold ' + (o.valueSize || 11) + 'px system-ui, sans-serif'; |
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ctx2.textAlign = 'center'; |
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ctx2.textBaseline = 'bottom'; |
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meta2.data.forEach(function (bar, i) { |
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var seg = segs[i]; |
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var txt = abbr(seg.displayValue, o.valuePrefix || '', o.valueSuffix || '', o.abbreviate !== false); |
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ctx2.fillStyle = seg.type === 'decrease' ? o.decreaseColor : seg.barColor; |
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var topY = chartInstance.scales.y.getPixelForValue(seg.floatY[1]); |
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ctx2.fillText(txt, bar.x, topY - 4); |
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}); |
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ctx2.restore(); |
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}; |
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chartInstance.draw(); |
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} |
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}); |
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} |
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|
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function init() { |
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document.querySelectorAll('.bkbg-wfc-app').forEach(function (appEl) { |
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if (appEl.dataset.rendered) return; |
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appEl.dataset.rendered = '1'; |
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|
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var opts; |
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try { opts = JSON.parse(appEl.dataset.opts || '{}'); } catch (e) { opts = {}; } |
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|
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var o = Object.assign({ |
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title: 'Revenue Waterfall', |
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showTitle: true, |
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items: [], |
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valuePrefix: '$', |
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valueSuffix: '', |
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abbreviate: true, |
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height: 380, |
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barThickness: 48, |
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showConnectors: true, |
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showDataLabels: true, |
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showGrid: true, |
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showLegend: true, |
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borderRadius: 4, |
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maxWidth: 800, |
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paddingTop: 24, |
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paddingBottom: 24, |
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titleSize: 20, |
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labelSize: 12, |
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valueSize: 11, |
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startColor: '#6366f1', |
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increaseColor: '#10b981', |
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decreaseColor: '#ef4444', |
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totalColor: '#8b5cf6', |
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connectorColor: '#9ca3af', |
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bgColor: '#ffffff', |
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titleColor: '#111827', |
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labelColor: '#6b7280', |
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gridColor: '#e5e7eb' |
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}, opts); |
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|
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initChart(appEl, o); |
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}); |
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} |
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|
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if (document.readyState !== 'loading') { init(); } |
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else { document.addEventListener('DOMContentLoaded', init); } |
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})(); |
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|
