SVG分段进度栏

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html

css

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html

<main>
	<svg class="sp" width="204px" height="24px" viewBox="0 0 204 24" xmlns="http://www.w3.org/2000/svg">
		
		<circle data-dot="1" class="sp__dot" cx="12" cy="12" r="0" fill="#000"/>
		<line class="sp__bar" x1="22" y1="12" x2="62" y2="12" fill="none" stroke="#000" stroke-width="4" />
		<circle data-hub="1" class="sp__hub" cx="12" cy="12" r="2" fill="none" stroke="#000" stroke-width="4" />
		<line data-bar="1" class="sp__bar-fill" x1="22" y1="12" x2="62" y2="12" fill="none" stroke="#000" stroke-width="4" />
		<circle data-hub-fill="1" class="sp__hub-fill" cx="12" cy="12" r="10" fill="none" stroke-width="4" transform="rotate(180,12,12)" />
		
		<circle data-dot="2" class="sp__dot" cx="72" cy="12" r="0" fill="#000"/>
		<line class="sp__bar" x1="82" y1="12" x2="122" y2="12" fill="none" stroke="#000" stroke-width="4" />
		<circle data-hub="2" class="sp__hub" cx="72" cy="12" r="2" fill="none" stroke="#000" stroke-width="4" />
		<line data-bar="2" class="sp__bar-fill" x1="82" y1="12" x2="122" y2="12" fill="none" stroke="#000" stroke-width="4" />
		<circle data-hub-fill="2" class="sp__hub-fill" cx="72" cy="12" r="10" fill="none" stroke-width="4" transform="rotate(180,72,12)" />
		
		<circle data-dot="3" class="sp__dot" cx="132" cy="12" r="0" fill="#000"/>
		<line class="sp__bar" x1="142" y1="12" x2="182" y2="12" fill="none" stroke="#000" stroke-width="4" />
		<circle data-hub="3" class="sp__hub" cx="132" cy="12" r="2" fill="none" stroke="#000" stroke-width="4" />
		<line data-bar="3" class="sp__bar-fill" x1="142" y1="12" x2="182" y2="12" fill="none" stroke="#000" stroke-width="4" />
		<circle data-hub-fill="3" class="sp__hub-fill" cx="132" cy="12" r="10" fill="none" stroke-width="4" transform="rotate(180,132,12)" />
		
		<circle data-dot="4" class="sp__dot" cx="192" cy="12" r="0" fill="#000"/>
		<circle data-hub="4" class="sp__hub" cx="192" cy="12" r="2" fill="none" stroke="#000" stroke-width="4" />
		<circle data-hub-fill="4" class="sp__hub-fill" cx="192" cy="12" r="10" fill="none" stroke-width="4" transform="rotate(180,192,12)" />
	</svg>
	<p class="status"></p>
	<button id="reset" type="button">Reset</button>
</main>

css

* {
	border: 0;
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}
:root {
	--hue: 223;
	--bg: hsl(var(--hue),10%,90%);
	--fg: hsl(var(--hue),10%,10%);
	--primary: hsl(var(--hue),90%,55%);
	--disabled: hsl(var(--hue),10%,75%);
	font-size: calc(16px + (24 - 16) * (100vw - 320px) / (1280 - 320));
}
body, button {
	font: 1em/1.5 Hind, sans-serif;
}
body {
	background: var(--bg);
	color: var(--fg);
	height: 100vh;
	display: grid;
	place-items: center;background-color: #1F1F1F;color: #fff;
}
button {
	background: hsl(var(--hue),90%,55%);
	border-radius: 0.2em;
	color: #fff;
	cursor: pointer;
	margin: auto;
	padding: 0.5em 1em;
	position: relative;
	left: 50%;
	transform: translateX(-50%);
	text-align: center;
	transition: background 0.15s linear;
}
button:hover {
	background: hsl(var(--hue),90%,45%);
}
.sp {
	--incTrans: 0.1; /* in seconds */
	display: block;
	margin-bottom: 1.5em;
	overflow: visible;
	width: 12.75em;
	height: 1.5em;
}
.sp__bar, .sp__hub {
	stroke: var(--disabled);
}
.sp__hub--done, .sp__dot--done {
	transition: r 0.2s cubic-bezier(0,0,0.33,1.67);
}
.sp__hub--done {
	r: 10px;
}
.sp__hub--done ~ .sp__bar-fill {
	transition: all calc(1s * var(--incTrans)) linear;
}
.sp__bar-fill, .sp__hub-fill {
	stroke: var(--primary);
}
.sp__bar-fill {
	stroke-dasharray: 40 40;
	stroke-dashoffset: 40;
}
.sp__hub-fill {
	stroke-dasharray: 0 62.8 0;
	visibility: hidden;
}
.sp__hub-fill--done {
	stroke-dasharray: 31.4 0 31.4;
	transition: all 0.2s 0.2s ease-out;
	visibility: visible;
}
.sp__dot {
	fill: var(--primary);
}
.sp__dot--done {
	r: 4px;
	transition-delay: 0.4s;
}
.status {
	margin-bottom: 4.5em;
	text-align: center;
}

@media (prefers-color-scheme: dark) {
	:root {
		--bg: hsl(var(--hue),10%,10%);
		--fg: hsl(var(--hue),10%,90%);
		--primary: hsl(var(--hue),90%,65%);
		--disabled: hsl(var(--hue),10%,30%);
	}
}

JavaScript

document.addEventListener("DOMContentLoaded",() => {
	const spb = new SegmentedProgress(".sp",".status");
});

class SegmentedProgress {
	constructor(svgQS,statusQS) {
		this.svgEl = document.querySelector(svgQS);
		this.statusEl = document.querySelector(statusQS);
		this.pct = 0;
		this.part = 0;
		this.parts = 4;
		this.timeout = null;

this.init();

clearTimeout(this.timeout);
		this.init();
	}
	run() {
		if (this.part < this.parts) {
			// increment
			if (this.pct < 100) {
				this.inc(10);
				let svgCS = window.getComputedStyle(this.svgEl),
					incTrans = (svgCS.getPropertyValue("--incTrans") * 1e3) || 0;
				this.timeout = setTimeout(this.run.bind(this),incTrans);

} else {
				this.nextPart();
			}
		}
	}
	inc(amt) {
		this.pct += amt;

if (this.pct >= 100)
			this.pct = 100;

this.fillBar(this.part,this.pct);
	}
	fillBar(part,pct) {
		if (this.svgEl) {
			let bar = this.svgEl.querySelector(`[data-bar='${part}']`);
			if (bar) {
				let offset = 40 * (1 - this.pct / 100);
				bar.style.strokeDashoffset = offset;
			}
		}
	}
	fillCircle(part,unfill = false) {
		let dot = this.svgEl.querySelector(`[data-dot='${part}']`),
			hub = this.svgEl.querySelector(`[data-hub='${part}']`),
			hubFill = this.svgEl.querySelector(`[data-hub-fill='${part}']`);

if (unfill === true) {
			if (dot)
				dot.classList.remove("sp__dot--done");
			if (hub)
				hub.classList.remove("sp__hub--done");
			if (hubFill)
				hubFill.classList.remove("sp__hub-fill--done");
		} else {
			if (dot)
				dot.classList.add("sp__dot--done");
			if (hub)
				hub.classList.add("sp__hub--done");
			if (hubFill)
				hubFill.classList.add("sp__hub-fill--done");
		}
	}
	nextPart() {
		this.pct = 0;
		// next part’s circle
		++this.part;
		this.fillCircle(this.part);
		// display the message
		let msg = "";
		if (this.part < this.parts)
			msg = `\u0044ownloading ${this.part}/${this.parts - 1}…`;
		else
			msg = "Complete!";

this.updateStatus(msg);
		// delay for next bar
		let hubTotalTrans = 600;
		this.timeout = setTimeout(this.run.bind(this),hubTotalTrans);
	}
	updateStatus(msg) {
		if (this.statusEl)
			this.statusEl.textContent = msg;
	}
}

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