@fiscozen/progress

Progress indicators for Vue 3 applications, including animated loading spinners and visual progress bars with customizable ranges.

Features

• Loading Spinner: Animated spinner component for loading states
• Progress Bar: Visual progress indicator with customizable min/max ranges
• Custom Ranges: Support for negative values and custom ranges (e.g., -15 to 50)
• Smooth Transitions: CSS transitions for progress bar updates
• Accessibility: Full WCAG 2.1 AA compliance with ARIA attributes
• TypeScript: Full type safety with TypeScript definitions

Installation

npm install @fiscozen/progress

Components

This package exports two components:

• FzProgress - Animated loading spinner indicator
• FzProgressBar - Visual progress bar with percentage display

Basic Usage

FzProgress

<script setup lang="ts">
import { FzProgress } from '@fiscozen/progress'
</script>

<template>
  <FzProgress />
</template>

FzProgressBar

<script setup lang="ts">
import { FzProgressBar } from '@fiscozen/progress'
</script>

<template>
  <FzProgressBar :current="50" />
</template>

FzProgress

With Custom Size

<template>
  <FzProgress size="sm" />
  <FzProgress size="lg" />
  <FzProgress size="xl" />
</template>

FzProgressBar

Basic Progress

<template>
  <!-- 0% -->
  <FzProgressBar :current="0" />
  
  <!-- 50% -->
  <FzProgressBar :current="50" />
  
  <!-- 100% -->
  <FzProgressBar :current="100" />
</template>

Custom Range

<template>
  <!-- Range from -15 to 50, current value 30 -->
  <FzProgressBar :current="30" :min="-15" :max="50" />
  
  <!-- Range from 0 to 200, current value 150 -->
  <FzProgressBar :current="150" :min="0" :max="200" />
</template>

Custom Label

<template>
  <FzProgressBar
    :current="75"
    label="Caricamento file"
  />
</template>

Contextual progress with valueText

<template>
  <FzProgressBar
    :current="3"
    :max="10"
    label="Caricamento file"
    valueText="Caricamento file 3 di 10"
  />
</template>

Custom Size

<template>
  <!-- Small size -->
  <FzProgressBar :current="50" size="sm" />
  
  <!-- Medium size (default) -->
  <FzProgressBar :current="50" size="md" />
</template>

Custom Color

<template>
  <!-- Purple (default) -->
  <FzProgressBar :current="50" color="purple" />
  
  <!-- Blue -->
  <FzProgressBar :current="50" color="blue" />
  
  <!-- Orange -->
  <FzProgressBar :current="50" color="orange" />
  
  <!-- Pink -->
  <FzProgressBar :current="50" color="pink" />
  
  <!-- Yellow -->
  <FzProgressBar :current="50" color="yellow" />
  
  <!-- Grey -->
  <FzProgressBar :current="50" color="grey" />
  
  <!-- Red (semantic error) -->
  <FzProgressBar :current="50" color="red" />
</template>

Props

FzProgress Props

FzProgressBar Props

Behavior & Concepts

Progress Calculation

The progress bar calculates the percentage position of the current value within the [min, max] range:

percentage = ((current - min) / (max - min)) * 100

The result is clamped between 0% and 100% for CSS width.

Examples:

• current=50, min=0, max=100 → 50%
• current=30, min=-15, max=50 → (30 - (-15)) / (50 - (-15)) * 100 = 69%
• current=-10, min=0, max=100 → 0% (clamped)
• current=150, min=0, max=100 → 100% (clamped)

Custom Ranges

The component supports custom ranges including negative values:

<template>
  <!-- Temperature range: -25°C to 75°C, current 0°C -->
  <FzProgressBar
    :current="0"
    :min="-25"
    :max="75"
    label="Temperatura"
  />
  <!-- Result: (0 - (-25)) / (75 - (-25)) * 100 = 25% -->
</template>

Accessibility

FzProgress

• Wrapper has role="status" (implicit aria-live="polite"), so screen readers announce the loading state when the spinner enters the DOM
• aria-label defaults to 'Caricamento…', overridable via the label prop, and is mirrored as visually-hidden text for screen readers that prefer text content
• The animation is disabled under @media (prefers-reduced-motion: reduce) to comply with WCAG 2.3.3
• Consumer guidance: the container that toggles the spinner should set aria-busy="true" while loading, so the surrounding content is marked as not yet ready. Example:

  <div :aria-busy="loading">
    <FzProgress v-if="loading" />
    <slot v-else />
  </div>
  

FzProgressBar

Follows WCAG 2.1 AA and includes:

• ARIA Attributes:
  • role="progressbar" for semantic meaning
  • aria-valuenow with current value (sanitized for NaN/Infinity)
  • aria-valuemin with minimum value
  • aria-valuemax with maximum value
  • aria-label from the label prop for screen reader description
  • aria-valuetext from the optional valueText prop for human-readable contextual progress
• Reduced motion: the width transition uses motion-safe: Tailwind utilities, so it is automatically disabled under prefers-reduced-motion: reduce (WCAG 2.3.3)
• Screen Reader Support: Progress values and contextual descriptions are accessible when navigating to the progress bar
• Keyboard Navigation: Progress bar is accessible via keyboard (though not interactive)

Future enhancements (nice to have)

These are intentionally left out of the current API and tracked for future minor releases when a real consumer requires them:

• Indeterminate state for FzProgressBar — a way to express "progress unknown" via animated stripes, travelling fill, or pulse, with aria-valuenow omitted (per ARIA APG). Will be added as an additive indeterminate?: boolean prop when needed.

Notes

Why Div Instead of HTML Progress Element?

We use div elements instead of the HTML <progress> element for better CSS cross-browser compatibility. The progress element requires browser-specific pseudo-elements (::-webkit-progress-bar, ::-moz-progress-bar) which can be inconsistent across browsers and harder to style with Tailwind CSS.

Related Components

• FzIcon: Used internally by FzProgress for icon rendering