UI Components Easy

Progress Bar

Linear progress indicators — determinate with label, indeterminate animated, stepped segments, and multi-color stacked bars.

Open in Lab

css vanilla-js

Targets: JS HTML React Native

Expo Snack

Code

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: Inter, system-ui, sans-serif;
  background: #050910;
  color: #f2f6ff;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.demo {
  width: 100%;
  max-width: 520px;
}
.demo-title {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 0.375rem;
}
.demo-sub {
  color: #475569;
  font-size: 0.875rem;
  margin-bottom: 2rem;
}

.section {
  margin-bottom: 2rem;
}
.section-label {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #475569;
  margin-bottom: 0.75rem;
}

.bars {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.bar-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.bar-row .progress {
  flex: 1;
}
.bar-pct {
  font-size: 0.75rem;
  color: #475569;
  width: 2.5rem;
  text-align: right;
  flex-shrink: 0;
}

/* ── Track ── */
.progress {
  height: 8px;
  border-radius: 999px;
  background: #0d1117;
  overflow: hidden;
  position: relative;
}

/* ── Fill ── */
.progress-fill {
  height: 100%;
  border-radius: 999px;
  background: #38bdf8;
  width: 0%;
  transition: width 0.8s cubic-bezier(0.23, 1, 0.32, 1);
}

.progress--green .progress-fill {
  background: #22c55e;
}
.progress--amber .progress-fill {
  background: #f59e0b;
}
.progress--red .progress-fill {
  background: #ef4444;
}

/* ── Indeterminate ── */
.progress--indeterminate {
  overflow: hidden;
}
.progress-fill--indeterminate {
  width: 40% !important;
  animation: indeterminate 1.4s ease-in-out infinite;
}
@keyframes indeterminate {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(350%);
  }
}
@media (prefers-reduced-motion: reduce) {
  .progress-fill--indeterminate {
    animation: none;
    width: 60% !important;
  }
}

/* ── Steps ── */
.progress-steps {
  display: flex;
  gap: 0.375rem;
  margin-bottom: 0.625rem;
}
.step {
  flex: 1;
  height: 6px;
  border-radius: 999px;
  background: #0d1117;
}
.step--done {
  background: #38bdf8;
}
.step--active {
  background: linear-gradient(90deg, #38bdf8, #818cf8);
}

.steps-label {
  font-size: 0.8rem;
  color: #64748b;
}

/* ── Stacked ── */
.progress--stacked {
  height: 12px;
  display: flex;
  overflow: hidden;
  gap: 0;
  border-radius: 999px;
}
.progress-segment {
  height: 100%;
  transition: width 0.8s cubic-bezier(0.23, 1, 0.32, 1);
}
.progress-segment--blue {
  background: #38bdf8;
}
.progress-segment--purple {
  background: #a78bfa;
}
.progress-segment--green {
  background: #22c55e;
}

.stacked-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 0.75rem;
}
.legend-item {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.75rem;
  color: #64748b;
}
.legend-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.15);
  flex-shrink: 0;
}
.legend-dot--blue {
  background: #38bdf8;
}
.legend-dot--purple {
  background: #a78bfa;
}
.legend-dot--green {
  background: #22c55e;
}

(function () {
  var reduced = window.matchMedia("(prefers-reduced-motion: reduce)").matches;

  document.querySelectorAll(".progress-fill[data-value]").forEach(function (fill) {
    var target = parseFloat(fill.dataset.value) || 0;
    if (reduced) {
      fill.style.width = target + "%";
      return;
    }
    requestAnimationFrame(function () {
      setTimeout(function () {
        fill.style.width = target + "%";
      }, 100);
    });
  });
})();

<!doctype html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>Progress Bar</title>
  <link rel="stylesheet" href="style.css" />
</head>
<body>
  <div class="demo">
    <h1 class="demo-title">Progress Bar</h1>
    <p class="demo-sub">Determinate, indeterminate, stepped, and stacked variants.</p>

    <section class="section">
      <p class="section-label">Determinate</p>
      <div class="bars">
        <div class="bar-row">
          <div class="progress" role="progressbar" aria-valuenow="25" aria-valuemin="0" aria-valuemax="100">
            <div class="progress-fill" data-value="25"></div>
          </div>
          <span class="bar-pct">25%</span>
        </div>
        <div class="bar-row">
          <div class="progress progress--green" role="progressbar" aria-valuenow="60">
            <div class="progress-fill" data-value="60"></div>
          </div>
          <span class="bar-pct">60%</span>
        </div>
        <div class="bar-row">
          <div class="progress progress--amber" role="progressbar" aria-valuenow="80">
            <div class="progress-fill" data-value="80"></div>
          </div>
          <span class="bar-pct">80%</span>
        </div>
        <div class="bar-row">
          <div class="progress progress--red" role="progressbar" aria-valuenow="95">
            <div class="progress-fill" data-value="95"></div>
          </div>
          <span class="bar-pct">95%</span>
        </div>
      </div>
    </section>

    <section class="section">
      <p class="section-label">Indeterminate</p>
      <div class="progress progress--indeterminate" role="progressbar" aria-label="Loading">
        <div class="progress-fill progress-fill--indeterminate"></div>
      </div>
    </section>

    <section class="section">
      <p class="section-label">Stepped (3 of 5)</p>
      <div class="progress-steps">
        <div class="step step--done"></div>
        <div class="step step--done"></div>
        <div class="step step--active"></div>
        <div class="step"></div>
        <div class="step"></div>
      </div>
      <p class="steps-label">Step 3 of 5 — Payment details</p>
    </section>

    <section class="section">
      <p class="section-label">Stacked / multi-segment</p>
      <div class="progress progress--stacked" role="meter" aria-label="Storage breakdown">
        <div class="progress-segment progress-segment--blue"  style="width:45%" title="Documents 45%"></div>
        <div class="progress-segment progress-segment--purple" style="width:25%" title="Media 25%"></div>
        <div class="progress-segment progress-segment--green"  style="width:15%" title="Backups 15%"></div>
      </div>
      <div class="stacked-legend">
        <span class="legend-item"><i class="legend-dot legend-dot--blue"></i>Documents 45%</span>
        <span class="legend-item"><i class="legend-dot legend-dot--purple"></i>Media 25%</span>
        <span class="legend-item"><i class="legend-dot legend-dot--green"></i>Backups 15%</span>
        <span class="legend-item"><i class="legend-dot"></i>Free 15%</span>
      </div>
    </section>
  </div>

  <script src="script.js"></script>
</body>
</html>

import React, { useEffect, useRef } from "react";
import { Animated, Easing, StyleSheet, Text, View } from "react-native";

type BarColor = "default" | "success" | "warning" | "error";

const COLOR_MAP: Record<BarColor, string> = {
  default: "#818cf8",
  success: "#34d399",
  warning: "#fbbf24",
  error: "#f87171",
};

interface ProgressBarProps {
  value?: number;
  color?: BarColor;
  indeterminate?: boolean;
  height?: number;
  label?: string;
}

function ProgressBar({
  value = 0,
  color = "default",
  indeterminate = false,
  height = 8,
  label,
}: ProgressBarProps) {
  const fillWidth = useRef(new Animated.Value(0)).current;
  const indeterminateAnim = useRef(new Animated.Value(0)).current;

  useEffect(() => {
    if (indeterminate) {
      Animated.loop(
        Animated.sequence([
          Animated.timing(indeterminateAnim, {
            toValue: 1,
            duration: 1200,
            easing: Easing.inOut(Easing.ease),
            useNativeDriver: true,
          }),
          Animated.timing(indeterminateAnim, {
            toValue: 0,
            duration: 1200,
            easing: Easing.inOut(Easing.ease),
            useNativeDriver: true,
          }),
        ])
      ).start();
    } else {
      Animated.timing(fillWidth, {
        toValue: Math.min(100, Math.max(0, value)),
        duration: 600,
        easing: Easing.out(Easing.cubic),
        useNativeDriver: false,
      }).start();
    }
  }, [value, indeterminate, fillWidth, indeterminateAnim]);

  const barColor = COLOR_MAP[color];

  if (indeterminate) {
    const translateX = indeterminateAnim.interpolate({
      inputRange: [0, 1],
      outputRange: [-120, 300],
    });

    return (
      <View style={styles.barWrapper}>
        {label && <Text style={styles.label}>{label}</Text>}
        <View style={[styles.track, { height }]}>
          <Animated.View
            style={[
              styles.indeterminateFill,
              {
                height,
                backgroundColor: barColor,
                transform: [{ translateX }],
              },
            ]}
          />
        </View>
      </View>
    );
  }

  const width = fillWidth.interpolate({
    inputRange: [0, 100],
    outputRange: ["0%", "100%"],
  });

  return (
    <View style={styles.barWrapper}>
      <View style={styles.labelRow}>
        {label && <Text style={styles.label}>{label}</Text>}
        <Text style={[styles.percentage, { color: barColor }]}>{value}%</Text>
      </View>
      <View style={[styles.track, { height }]}>
        <Animated.View
          style={[
            styles.fill,
            {
              width,
              height,
              backgroundColor: barColor,
            },
          ]}
        />
      </View>
    </View>
  );
}

export default function App() {
  return (
    <View style={styles.container}>
      <Text style={styles.header}>Progress</Text>
      <Text style={styles.subheader}>Animated progress indicators</Text>

      <View style={styles.demos}>
        <ProgressBar value={72} color="default" label="Upload" height={10} />
        <ProgressBar value={100} color="success" label="Complete" height={10} />
        <ProgressBar value={45} color="warning" label="Storage" height={10} />
        <ProgressBar value={88} color="error" label="CPU Usage" height={10} />
        <ProgressBar indeterminate color="default" label="Loading..." height={6} />
      </View>
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: "#0f172a",
    paddingTop: 60,
    paddingHorizontal: 20,
  },
  header: {
    color: "#f8fafc",
    fontSize: 28,
    fontWeight: "700",
  },
  subheader: {
    color: "#64748b",
    fontSize: 14,
    marginTop: 4,
    marginBottom: 32,
  },
  demos: {
    gap: 24,
  },
  barWrapper: {
    width: "100%",
  },
  labelRow: {
    flexDirection: "row",
    justifyContent: "space-between",
    alignItems: "center",
    marginBottom: 8,
  },
  label: {
    color: "#cbd5e1",
    fontSize: 14,
    fontWeight: "500",
    marginBottom: 8,
  },
  percentage: {
    fontSize: 14,
    fontWeight: "600",
  },
  track: {
    width: "100%",
    backgroundColor: "#1e293b",
    borderRadius: 999,
    overflow: "hidden",
  },
  fill: {
    borderRadius: 999,
  },
  indeterminateFill: {
    width: 120,
    borderRadius: 999,
  },
});

Progress Bar

Communicate progress, loading state, or multi-step completion.

Variants

Variant	Use case
Determinate	Known completion percentage
Indeterminate	Unknown duration loading
Stepped	Multi-step form / onboarding
Stacked	Breakdown of multiple segments

Features

Animated fill-in on page load via requestAnimationFrame
Color variants (blue, green, amber, red)
Percentage label inside or outside the track
prefers-reduced-motion respected — instant fill when opted out