invisi/accessibility-widgets
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accessibility-widgets/widget.js
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/*
===========================================
ACCESSIBILITY WIDGET
A comprehensive web accessibility tool
===========================================
*/
// ===========================================
// CONFIGURATION VARIABLES
// ===========================================
// Feature toggles - set to false to disable features
const WIDGET_CONFIG = {
// Core Features
enableHighContrast: true,
enableBiggerText: true,
enableTextSpacing: true,
enablePauseAnimations: true,
enableHideImages: true,
enableDyslexiaFont: true,
enableBiggerCursor: true,
enableLineHeight: true,
enableTextAlign: true,
// Advanced Features
enableScreenReader: true,
enableVoiceControl: true,
enableReadingMode: true,
enableEnhancedFocus: true,
enableReducedMotion: true,
enableFontSelection: true,
enableColorFilter: true,
// Widget Styling
widgetWidth: '440px',
widgetPosition: {
right: '20px',
bottom: '20px'
},
// Colors
colors: {
primary: '#1e90ff',
primaryHover: '#00bfff',
secondary: '#f9f9f9',
text: '#333',
textLight: '#fff',
border: '#e6e6e6',
borderHover: '#d4d4d4',
shadow: 'rgba(0, 0, 0, 0.2)',
focus: '#ff6b35',
focusGlow: 'rgba(255, 107, 53, 0.3)'
},
// Button styling
button: {
size: '55px',
borderRadius: '1000px',
iconSize: '28px',
shadow: '0 4px 8px rgba(0, 0, 0, 0.2)'
},
// Menu styling
menu: {
headerHeight: '55px',
padding: '0 10px 10px 10px',
optionPadding: '14px 10px',
optionMargin: '10px',
borderRadius: '8px',
fontSize: '16px',
titleFontSize: '22px',
closeButtonSize: '44px'
},
// Typography
typography: {
fontFamily: 'Arial, sans-serif',
fontSize: '16px',
titleFontSize: '22px',
titleFontWeight: '500',
lineHeight: '1'
},
// Animation
animation: {
transition: '0.2s',
hoverScale: '1.05'
}
};
// ===========================================
// STYLES & VISUAL ASSETS
// ===========================================
// Generate styles using configuration variables
const styles = `
#snn-accessibility-fixed-button {
position: fixed !important;
right: ${WIDGET_CONFIG.widgetPosition.right} !important;
bottom: ${WIDGET_CONFIG.widgetPosition.bottom} !important;
z-index: 9999;
}
#snn-accessibility-button {
background: linear-gradient(135deg, ${WIDGET_CONFIG.colors.primary}, ${WIDGET_CONFIG.colors.primaryHover});
border: none;
border-radius: ${WIDGET_CONFIG.button.borderRadius};
cursor: pointer;
width: ${WIDGET_CONFIG.button.size};
height: ${WIDGET_CONFIG.button.size};
box-shadow: ${WIDGET_CONFIG.button.shadow};
transition: ${WIDGET_CONFIG.animation.transition} !important;
}
#snn-accessibility-button:hover {
transform: scale(${WIDGET_CONFIG.animation.hoverScale});
}
#snn-accessibility-button:focus {
outline: 2px solid ${WIDGET_CONFIG.colors.textLight};
outline-offset: 2px;
}
#snn-accessibility-button svg {
width: ${WIDGET_CONFIG.button.iconSize};
height: ${WIDGET_CONFIG.button.iconSize};
fill: ${WIDGET_CONFIG.colors.textLight};
pointer-events: none;
}
#snn-accessibility-menu {
position: fixed;
top: 0;
right: 0;
width: ${WIDGET_CONFIG.widgetWidth};
height: 100vh;
overflow-y: auto;
background-color: ${WIDGET_CONFIG.colors.secondary};
padding: ${WIDGET_CONFIG.menu.padding};
display: none;
font-family: ${WIDGET_CONFIG.typography.fontFamily};
z-index: 9999;
scrollbar-width: thin;
}
.snn-accessibility-option {
font-size: ${WIDGET_CONFIG.menu.fontSize};
display: flex;
align-items: center;
margin-bottom: ${WIDGET_CONFIG.menu.optionMargin};
padding: ${WIDGET_CONFIG.menu.optionPadding};
width: calc(100% - ${parseInt(WIDGET_CONFIG.menu.optionMargin) * 2}px);
margin-left: ${WIDGET_CONFIG.menu.optionMargin};
margin-right: ${WIDGET_CONFIG.menu.optionMargin};
background-color: ${WIDGET_CONFIG.colors.border};
color: ${WIDGET_CONFIG.colors.text};
border: none;
cursor: pointer;
border-radius: ${WIDGET_CONFIG.menu.borderRadius};
transition: background-color ${WIDGET_CONFIG.animation.transition};
line-height: ${WIDGET_CONFIG.typography.lineHeight} !important;
}
.snn-accessibility-option:hover {
background-color: ${WIDGET_CONFIG.colors.borderHover};
}
.snn-accessibility-option.active {
background-color: ${WIDGET_CONFIG.colors.primary};
color: ${WIDGET_CONFIG.colors.textLight};
}
.snn-icon {
margin-right: 12px;
width: ${WIDGET_CONFIG.button.iconSize};
height: ${WIDGET_CONFIG.button.iconSize};
}
.snn-icon svg {
width: 100%;
height: 100%;
fill: currentColor;
}
.snn-close {
background: none;
border: none;
font-size: ${WIDGET_CONFIG.menu.closeButtonSize};
color: ${WIDGET_CONFIG.colors.textLight};
cursor: pointer;
margin-left: auto;
line-height: ${WIDGET_CONFIG.typography.lineHeight};
border-radius: ${WIDGET_CONFIG.button.borderRadius};
width: ${WIDGET_CONFIG.menu.closeButtonSize};
height: ${WIDGET_CONFIG.menu.closeButtonSize};
}
.snn-close:focus {
outline: solid 2px ${WIDGET_CONFIG.colors.textLight};
}
.snn-close:hover {
color: ${WIDGET_CONFIG.colors.text};
}
.snn-header {
display: flex;
align-items: center;
margin-bottom: 20px;
padding: 10px;
background: ${WIDGET_CONFIG.colors.primary};
height: ${WIDGET_CONFIG.menu.headerHeight};
}
.snn-title {
margin: 0;
font-size: ${WIDGET_CONFIG.menu.titleFontSize};
color: ${WIDGET_CONFIG.colors.textLight};
line-height: ${WIDGET_CONFIG.typography.lineHeight} !important;
margin-left: 5px;
font-weight: ${WIDGET_CONFIG.typography.titleFontWeight};
}
/* Accessibility feature styles */
.snn-high-contrast {
background-color: #000 !important;
color: #fff !important;
filter: contrast(1.5) !important;
}
.snn-high-contrast body *{
background-color: #000 !important;
color: #fff !important;
filter: contrast(1.5) !important;
}
.snn-high-contrast #snn-accessibility-menu{
filter: contrast(0.7) !important;
}
.snn-bigger-text * {
font-size: 24px !important;
}
.snn-text-spacing *:not(#snn-accessibility-menu *, #snn-accessibility-fixed-button *, #snn-accessibility-button *, .snn-accessibility-option *) {
letter-spacing: 0.2em !important;
word-spacing: 0.3em !important;
}
.snn-pause-animations * {
animation: none !important;
transition: none !important;
}
.snn-dyslexia-font {
font-family: 'OpenDyslexic', Arial, sans-serif !important;
}
.snn-line-height *:not(#snn-accessibility-menu *, #snn-accessibility-fixed-button *, #snn-accessibility-button *, .snn-accessibility-option *) {
line-height: 2.5 !important;
}
.snn-text-align *:not(#snn-accessibility-menu *, #snn-accessibility-fixed-button *, #snn-accessibility-button *, .snn-accessibility-option *) {
text-align: left !important;
}
.snn-bigger-cursor {
cursor: url('data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMjQiIGhlaWdodD0iMzYiIHZpZXdCb3g9IjAgMCAyNCAzNiIgZmlsbD0ibm9uZSIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj48cGF0aCBkPSJNMiAxVjM1TDEwIDI3SDE4TDIgMVoiIGZpbGw9IiMwMDAiIHN0cm9rZT0iI2ZmZiIgc3Ryb2tlLXdpZHRoPSIzIi8+PC9zdmc+'), auto !important;
}
/* Reading Mode */
.snn-reading-mode {
background: #f9f9f9 !important;
color: #333 !important;
line-height: 1.6 !important;
font-family: Georgia, serif !important;
}
.snn-reading-mode * {
background: transparent !important;
color: inherit !important;
font-family: inherit !important;
line-height: inherit !important;
}
.snn-reading-mode h1, .snn-reading-mode h2, .snn-reading-mode h3,
.snn-reading-mode h4, .snn-reading-mode h5, .snn-reading-mode h6 {
color: #222 !important;
font-weight: bold !important;
}
.snn-reading-mode img, .snn-reading-mode video, .snn-reading-mode iframe,
.snn-reading-mode aside, .snn-reading-mode nav, .snn-reading-mode footer,
.snn-reading-mode header, .snn-reading-mode .sidebar, .snn-reading-mode .menu {
display: none !important;
}
/* Font Selection */
.snn-font-arial {
font-family: Arial, sans-serif !important;
}
.snn-font-arial * {
font-family: Arial, sans-serif !important;
}
.snn-font-times {
font-family: 'Times New Roman', serif !important;
}
.snn-font-times * {
font-family: 'Times New Roman', serif !important;
}
.snn-font-verdana {
font-family: Verdana, sans-serif !important;
}
.snn-font-verdana * {
font-family: Verdana, sans-serif !important;
}
/* Color Filters */
.snn-filter-protanopia {
filter: url('#protanopia-filter') !important;
}
.snn-filter-deuteranopia {
filter: url('#deuteranopia-filter') !important;
}
.snn-filter-tritanopia {
filter: url('#tritanopia-filter') !important;
}
.snn-filter-grayscale {
filter: grayscale(100%) !important;
}
/* Enhanced Focus */
.snn-enhanced-focus *:focus {
outline: 3px solid ${WIDGET_CONFIG.colors.focus} !important;
outline-offset: 2px !important;
box-shadow: 0 0 0 5px ${WIDGET_CONFIG.colors.focusGlow} !important;
}
/* Reduced Motion */
.snn-reduced-motion * {
animation: none !important;
transition: none !important;
}
.snn-reduced-motion *::before,
.snn-reduced-motion *::after {
animation: none !important;
transition: none !important;
}
`;
// ===========================================
// SVG ICONS
// ===========================================
// SVG icons
const icons = {
buttonsvg: `<svg xmlns="http://www.w3.org/2000/svg" xml:space="preserve" width="" height="" version="1.1" style="shape-rendering:geometricPrecision; text-rendering:geometricPrecision; image-rendering:optimizeQuality; fill-rule:evenodd; clip-rule:evenodd" viewBox="0 0 2713 2713" xmlns:xlink="http://www.w3.org/1999/xlink"><defs><style type="text/css"><![CDATA[.fil1 {fill:#118ED6} .fil0 {fill:white}]]></style></defs><g id="Layer_x0020_1"><metadata id="CorelCorpID_0Corel-Layer"/><g id="_275060008"><circle class="fil0" cx="1356" cy="1356" r="1356"/><path class="fil1" d="M1305 315c-143,32 -237,147 -205,319 25,141 143,240 312,213 131,-21 237,-160 206,-324 -23,-125 -156,-243 -313,-208zm-150 1699l0 -340c1,-75 5,-367 1,-417 -9,-113 -93,-177 -174,-250 -19,-17 -33,-31 -53,-50 -19,-18 -35,-30 -54,-49 -19,-18 -34,-29 -53,-50 -38,-40 -162,-118 -98,-188 60,-65 124,34 188,86l111 99c11,10 17,13 27,25 9,12 16,18 28,28 35,30 72,64 125,85 122,50 214,44 334,-14 71,-34 103,-68 150,-113 9,-9 17,-15 27,-24 20,-18 39,-34 56,-51l108 -103c19,-18 29,-36 65,-39 33,-3 58,10 67,36 11,30 3,63 -13,83l-273 254c-40,31 -76,64 -109,98 -38,41 -54,80 -55,153 -3,243 -1,489 0,733 0,3 0,5 0,8 0,0 0,0 0,0 0,184 149,333 333,333 61,0 118,-17 167,-45 24,-18 48,-36 67,-51 39,-32 140,-145 171,-186 11,-16 19,-26 30,-42 104,-151 178,-317 209,-505 39,-242 -12,-506 -119,-712 -36,-69 -69,-123 -108,-178 -12,-15 -20,-24 -32,-39 -28,-36 -67,-84 -99,-115 -69,-66 -76,-68 -158,-129 -53,-39 -113,-70 -182,-103 -140,-67 -297,-100 -472,-102 -180,-2 -322,37 -472,97 -55,22 -93,42 -143,72 -55,33 -73,43 -127,87 -47,38 -70,60 -111,104 -6,6 -12,10 -18,17 -7,7 -9,13 -16,20 -8,9 -10,8 -17,18 -80,101 -91,116 -158,235 -64,113 -121,286 -136,435 -18,190 1,329 58,498 46,134 132,283 204,367 13,15 21,26 32,40 34,43 103,105 146,139 7,6 14,11 22,17 54,38 120,61 192,61 183,0 332,-149 332,-333l0 0z"/></g></g></svg>`,
highContrast: `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64"><circle cx="32" cy="32" r="30" fill="#000"/><path d="M32 2a30 30 0 000 60V2z" fill="#fff"/></svg>`,
biggerText: `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64"><path d="M32 8L8 56h12l6-12h24l6 12h12L32 8zm-6 36L32 20l6 24H26z"/></svg>`,
textSpacing: `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64"><path d="M10 16h44v4H10zm0 12h44v4H10zm0 12h44v4H10zm0 12h44v4H10z"/></svg>`,
pauseAnimations: `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64"><rect x="16" y="12" width="10" height="40"/><rect x="38" y="12" width="10" height="40"/></svg>`,
hideImages: `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64"><path d="M32 12C16 12 4 32 4 32s12 20 28 20 28-20 28-20S48 12 32 12zm0 32a12 12 0 1112-12 12 12 0 01-12 12z"/><circle cx="32" cy="32" r="8"/></svg>`,
dyslexiaFont: `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64"><path d="M12 8v48h12a16 16 0 000-32h-8v-8h16V8H12zm12 24a8 8 0 010 16h-4V32h4zM40 8v48h12V8H40z"/></svg>`,
biggerCursor: `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64"><path d="M12 4v56l16-16h24L12 4z"/></svg>`,
lineHeight: `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64"><path d="M16 16h32v4H16zm0 12h32v4H16zm0 12h32v4H16zm0 12h32v4H16zM8 8l8 8-8 8V8zm0 32l8 8-8 8V40z"/></svg>`,
textAlign: `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64"><path d="M10 16h44v4H10zm0 12h44v4H10zm0 12h44v4H10zm0 12h44v4H10z"/></svg>`,
screenReader: `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64"><path d="M16 24 L24 24 L32 16 L32 48 L24 40 L16 40 Z" fill="#333" stroke="#555" stroke-width="2"/><path d="M36 20 C42 24, 42 40, 36 44" fill="none" stroke="#fff" stroke-width="2" stroke-linecap="round"/><path d="M36 12 C48 24, 48 40, 36 52" fill="none" stroke="#555" stroke-width="2" stroke-linecap="round"/><rect x="28" y="48" width="8" height="8" fill="#ccc"/></svg>`,
resetAll: `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64"><path d="M32 12a20 20 0 100 40 20 20 0 000-40z" fill="none" stroke="#333" stroke-width="4" stroke-linecap="round" stroke-linejoin="round"/><polyline points="44,32 32,20 32,32" fill="none" stroke="#333" stroke-width="4" stroke-linecap="round" stroke-linejoin="round"/><line x1="44" y1="32" x2="48" y2="28" stroke="#333" stroke-width="2" stroke-linecap="round"/><line x1="44" y1="32" x2="48" y2="36" stroke="#333" stroke-width="2" stroke-linecap="round"/><path d="M32 12a20 20 0 0140 0" fill="none" stroke="#333" stroke-width="4" transform="rotate(180 32 32)"/></svg>`,
voiceControl: `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64"><path d="M32 44a12 12 0 0012-12V20a12 12 0 10-24 0v12a12 12 0 0012 12z" fill="#333"/><path d="M20 32h24v4H20z" fill="#555"/><path d="M32 48v8" stroke="#555" stroke-width="4" stroke-linecap="round"/></svg>`,
readingMode: `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64"><rect x="8" y="8" width="48" height="48" rx="4" fill="none" stroke="#333" stroke-width="2"/><path d="M16 20h32v4H16zm0 8h32v4H16zm0 8h24v4H16z"/></svg>`,
fontSelection: `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64"><text x="32" y="40" font-family="serif" font-size="24" text-anchor="middle" fill="#333">Aa</text><path d="M8 48h48v2H8z"/></svg>`,
colorFilter: `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64"><circle cx="32" cy="32" r="24" fill="none" stroke="#333" stroke-width="2"/><path d="M32 8a24 24 0 000 48V8z" fill="#f00" opacity="0.3"/><path d="M32 8a24 24 0 000 48" fill="none" stroke="#333" stroke-width="2" stroke-dasharray="4,2"/></svg>`,
enhancedFocus: `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64"><rect x="16" y="16" width="32" height="32" rx="4" fill="none" stroke="#ff6b35" stroke-width="3"/><path d="M8 8l8 8M56 8l-8 8M8 56l8-8M56 56l-8-8" stroke="#ff6b35" stroke-width="2" stroke-linecap="round"/></svg>`,
reducedMotion: `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64"><rect x="16" y="24" width="8" height="16" fill="#333"/><rect x="28" y="24" width="8" height="16" fill="#333"/><rect x="40" y="24" width="8" height="16" fill="#333"/></svg>`,
};
// ===========================================
// CORE UTILITY FUNCTIONS
// ===========================================
// Inject styles and SVG filters into the document
function injectStyles() {
const styleSheet = document.createElement('style');
styleSheet.innerText = styles;
document.head.appendChild(styleSheet);
// Add SVG color blindness filters
const svgFilters = document.createElementNS('http://www.w3.org/2000/svg', 'svg');
svgFilters.style.position = 'absolute';
svgFilters.style.width = '0';
svgFilters.style.height = '0';
svgFilters.innerHTML = `
<defs>
<filter id="protanopia-filter">
<feColorMatrix type="matrix" values="0.567,0.433,0,0,0 0.558,0.442,0,0,0 0,0.242,0.758,0,0 0,0,0,1,0"/>
</filter>
<filter id="deuteranopia-filter">
<feColorMatrix type="matrix" values="0.625,0.375,0,0,0 0.7,0.3,0,0,0 0,0.3,0.7,0,0 0,0,0,1,0"/>
</filter>
<filter id="tritanopia-filter">
<feColorMatrix type="matrix" values="0.95,0.05,0,0,0 0,0.433,0.567,0,0 0,0.475,0.525,0,0 0,0,0,1,0"/>
</filter>
</defs>
`;
document.body.appendChild(svgFilters);
}
// ===========================================
// PERFORMANCE OPTIMIZATION
// ===========================================
// Cache for DOM elements to improve performance
const domCache = {
body: document.body,
documentElement: document.documentElement,
images: null,
lastImageUpdate: 0,
getImages: function() {
const now = Date.now();
if (!this.images || now - this.lastImageUpdate > 5000) {
this.images = document.querySelectorAll('img');
this.lastImageUpdate = now;
}
return this.images;
}
};
// Apply saved settings from localStorage (optimized)
function applySettings() {
const settings = [
{ key: 'biggerCursor', className: 'snn-bigger-cursor' },
{ key: 'biggerText', className: 'snn-bigger-text' },
{ key: 'highContrast', className: 'snn-high-contrast', target: domCache.documentElement },
{ key: 'dyslexiaFont', className: 'snn-dyslexia-font' },
{ key: 'lineHeight', className: 'snn-line-height' },
{ key: 'textAlign', className: 'snn-text-align' },
{ key: 'pauseAnimations', className: 'snn-pause-animations' },
{ key: 'textSpacing', className: 'snn-text-spacing' },
{ key: 'readingMode', className: 'snn-reading-mode' },
{ key: 'enhancedFocus', className: 'snn-enhanced-focus' },
{ key: 'reducedMotion', className: 'snn-reduced-motion' },
];
// Batch DOM operations for better performance
const bodyClassesToAdd = [];
const bodyClassesToRemove = [];
const docClassesToAdd = [];
const docClassesToRemove = [];
settings.forEach(({ key, className, target = domCache.body }) => {
const isActive = localStorage.getItem(key) === 'true';
if (className) {
if (target === domCache.documentElement) {
if (isActive) {
docClassesToAdd.push(className);
} else {
docClassesToRemove.push(className);
}
} else {
if (isActive) {
bodyClassesToAdd.push(className);
} else {
bodyClassesToRemove.push(className);
}
}
}
});
// Apply all class changes at once
if (bodyClassesToAdd.length > 0) {
domCache.body.classList.add(...bodyClassesToAdd);
}
if (bodyClassesToRemove.length > 0) {
domCache.body.classList.remove(...bodyClassesToRemove);
}
if (docClassesToAdd.length > 0) {
domCache.documentElement.classList.add(...docClassesToAdd);
}
if (docClassesToRemove.length > 0) {
domCache.documentElement.classList.remove(...docClassesToRemove);
}
// Handle font selection
const fontClasses = ['snn-font-arial', 'snn-font-times', 'snn-font-verdana'];
domCache.body.classList.remove(...fontClasses);
const selectedFont = localStorage.getItem('fontSelection');
if (selectedFont) {
domCache.body.classList.add(`snn-font-${selectedFont}`);
}
// Handle color filters
const filterClasses = ['snn-filter-protanopia', 'snn-filter-deuteranopia', 'snn-filter-tritanopia', 'snn-filter-grayscale'];
domCache.documentElement.classList.remove(...filterClasses);
const selectedFilter = localStorage.getItem('colorFilter');
if (selectedFilter) {
domCache.documentElement.classList.add(`snn-filter-${selectedFilter}`);
}
// Handle images with cached query
const hideImages = localStorage.getItem('hideImages') === 'true';
const displayStyle = hideImages ? 'none' : '';
domCache.getImages().forEach((img) => {
img.style.display = displayStyle;
});
if (screenReader.active && screenReader.isSupported) {
document.addEventListener('focusin', screenReader.handleFocus);
}
if (voiceControl.isActive && voiceControl.isSupported) {
voiceControl.startListening();
}
}
// ===========================================
// UI COMPONENTS
// ===========================================
// Create the accessibility button
function createAccessibilityButton() {
const buttonContainer = document.createElement('div');
buttonContainer.id = 'snn-accessibility-fixed-button';
const button = document.createElement('button');
button.id = 'snn-accessibility-button';
button.innerHTML = icons.buttonsvg;
button.setAttribute('aria-label', 'Accessibility Menu');
button.addEventListener('click', function () {
toggleMenu();
});
button.addEventListener('keydown', function (e) {
if (e.key === 'Enter' || e.key === ' ') {
e.preventDefault();
toggleMenu();
}
});
buttonContainer.appendChild(button);
document.body.appendChild(buttonContainer);
}
// Reset all accessibility settings
function resetAccessibilitySettings() {
const keys = [
'biggerCursor',
'biggerText',
'dyslexiaFont',
'hideImages',
'lineHeight',
'pauseAnimations',
'screenReader',
'textAlign',
'textSpacing',
'highContrast',
'voiceControl',
'readingMode',
'enhancedFocus',
'reducedMotion',
'fontSelection',
'colorFilter',
];
keys.forEach((key) => localStorage.removeItem(key));
// Remove all CSS classes
const cssClasses = [
'snn-bigger-cursor',
'snn-bigger-text',
'snn-dyslexia-font',
'snn-pause-animations',
'snn-text-spacing',
'snn-line-height',
'snn-text-align',
'snn-reading-mode',
'snn-enhanced-focus',
'snn-reduced-motion',
'snn-font-arial',
'snn-font-times',
'snn-font-verdana'
];
cssClasses.forEach(cls => document.body.classList.remove(cls));
const documentClasses = [
'snn-high-contrast',
'snn-filter-protanopia',
'snn-filter-deuteranopia',
'snn-filter-tritanopia',
'snn-filter-grayscale'
];
documentClasses.forEach(cls => document.documentElement.classList.remove(cls));
domCache.getImages().forEach((img) => (img.style.display = ''));
if (screenReader.active) {
screenReader.toggle(false);
}
if (voiceControl.isActive) {
voiceControl.toggle(false);
}
applySettings();
const buttons = document.querySelectorAll('#snn-accessibility-menu .snn-accessibility-option');
buttons.forEach((button) => {
button.classList.remove('active');
button.setAttribute('aria-pressed', 'false');
});
}
// Create toggle buttons for accessibility options
function createToggleButton(
buttonText,
localStorageKey,
className,
targetElement = document.body,
customToggleFunction = null,
iconSVG = '',
requiresFeature = null
) {
const button = document.createElement('button');
button.innerHTML = `<span class="snn-icon">${iconSVG}</span><span class="snn-button-text">${buttonText}</span>`;
button.setAttribute('data-key', localStorageKey);
button.setAttribute('aria-label', buttonText);
button.classList.add('snn-accessibility-option');
// Check if feature is supported
if (requiresFeature && !requiresFeature.isSupported) {
button.disabled = true;
button.setAttribute('title', `${buttonText} is not supported in this browser`);
button.style.opacity = '0.5';
return button;
}
const isActive = localStorage.getItem(localStorageKey) === 'true';
button.setAttribute('aria-pressed', isActive);
button.setAttribute('role', 'switch');
if (isActive) {
button.classList.add('active');
}
button.addEventListener('click', function () {
handleToggle();
});
button.addEventListener('keydown', function (e) {
if (e.key === 'Enter' || e.key === ' ') {
e.preventDefault();
handleToggle();
}
});
function handleToggle() {
const newIsActive = localStorage.getItem(localStorageKey) !== 'true';
// If there's a custom toggle function, call it and check if it succeeded
if (customToggleFunction) {
const success = customToggleFunction(newIsActive);
if (success === false) {
// Feature not supported or failed
return;
}
}
localStorage.setItem(localStorageKey, newIsActive);
button.setAttribute('aria-pressed', newIsActive);
if (newIsActive) {
button.classList.add('active');
if (className) {
targetElement.classList.add(className);
}
} else {
button.classList.remove('active');
if (className) {
targetElement.classList.remove(className);
}
}
}
return button;
}
// Create special action buttons (for cycling through options)
function createActionButton(buttonText, actionFunction, iconSVG) {
const button = document.createElement('button');
button.innerHTML = `<span class="snn-icon">${iconSVG}</span><span class="snn-button-text">${buttonText}: <span class="snn-status">Default</span></span>`;
button.setAttribute('aria-label', buttonText);
button.classList.add('snn-accessibility-option');
// Update initial status
updateActionButtonStatus(button, buttonText, actionFunction);
button.addEventListener('click', function () {
const result = actionFunction();
if (result) {
const statusSpan = button.querySelector('.snn-status');
statusSpan.textContent = result;
}
});
button.addEventListener('keydown', function (e) {
if (e.key === 'Enter' || e.key === ' ') {
e.preventDefault();
const result = actionFunction();
if (result) {
const statusSpan = button.querySelector('.snn-status');
statusSpan.textContent = result;
}
}
});
return button;
}
// Update action button status on page load
function updateActionButtonStatus(button, buttonText, actionFunction) {
const statusSpan = button.querySelector('.snn-status');
if (buttonText.includes('Font')) {
const currentFont = localStorage.getItem('fontSelection');
statusSpan.textContent = currentFont ? currentFont.charAt(0).toUpperCase() + currentFont.slice(1) : 'Default';
} else if (buttonText.includes('Color')) {
const currentFilter = localStorage.getItem('colorFilter');
statusSpan.textContent = currentFilter ? currentFilter.charAt(0).toUpperCase() + currentFilter.slice(1) : 'None';
}
}
// ===========================================
// FEATURE TOGGLE FUNCTIONS
// ===========================================
// Function to hide or show images (optimized)
function toggleHideImages(isActive) {
const displayStyle = isActive ? 'none' : '';
domCache.getImages().forEach((img) => {
img.style.display = displayStyle;
});
}
// Font selection handler (optimized)
function handleFontSelection() {
const fonts = ['arial', 'times', 'verdana'];
const currentFont = localStorage.getItem('fontSelection') || 'default';
const currentIndex = fonts.indexOf(currentFont);
const nextIndex = (currentIndex + 1) % (fonts.length + 1); // +1 for default
// Remove all font classes in one operation
const fontClasses = ['snn-font-arial', 'snn-font-times', 'snn-font-verdana'];
domCache.body.classList.remove(...fontClasses);
if (nextIndex === fonts.length) {
// Default font
localStorage.removeItem('fontSelection');
return 'Default Font';
} else {
const selectedFont = fonts[nextIndex];
localStorage.setItem('fontSelection', selectedFont);
domCache.body.classList.add(`snn-font-${selectedFont}`);
return selectedFont.charAt(0).toUpperCase() + selectedFont.slice(1);
}
}
// Color filter handler (optimized)
function handleColorFilter() {
const filters = ['protanopia', 'deuteranopia', 'tritanopia', 'grayscale'];
const currentFilter = localStorage.getItem('colorFilter') || 'none';
const currentIndex = filters.indexOf(currentFilter);
const nextIndex = (currentIndex + 1) % (filters.length + 1); // +1 for none
// Remove all filter classes in one operation
const filterClasses = ['snn-filter-protanopia', 'snn-filter-deuteranopia', 'snn-filter-tritanopia', 'snn-filter-grayscale'];
domCache.documentElement.classList.remove(...filterClasses);
if (nextIndex === filters.length) {
// No filter
localStorage.removeItem('colorFilter');
return 'No Filter';
} else {
const selectedFilter = filters[nextIndex];
localStorage.setItem('colorFilter', selectedFilter);
domCache.documentElement.classList.add(`snn-filter-${selectedFilter}`);
return selectedFilter.charAt(0).toUpperCase() + selectedFilter.slice(1);
}
}
// ===========================================
// ACCESSIBILITY FEATURES
// ===========================================
// Screen reader functionality
const screenReader = {
active: localStorage.getItem('screenReader') === 'true',
isSupported: 'speechSynthesis' in window,
handleFocus: function (event) {
if (screenReader.active && screenReader.isSupported) {
try {
const content = event.target.innerText || event.target.alt || event.target.title || '';
if (content.trim() !== '') {
window.speechSynthesis.cancel();
const speech = new SpeechSynthesisUtterance(content);
speech.lang = 'en-US';
speech.onerror = function(event) {
console.warn('Speech synthesis error:', event.error);
};
window.speechSynthesis.speak(speech);
}
} catch (error) {
console.warn('Screen reader error:', error);
}
}
},
toggle: function (isActive) {
if (!screenReader.isSupported) {
console.warn('Speech synthesis is not supported in this browser.');
return false;
}
screenReader.active = isActive;
localStorage.setItem('screenReader', isActive);
try {
if (isActive) {
document.addEventListener('focusin', screenReader.handleFocus);
const feedbackSpeech = new SpeechSynthesisUtterance('Screen reader on');
feedbackSpeech.lang = 'en-US';
feedbackSpeech.onerror = function(event) {
console.warn('Speech synthesis feedback error:', event.error);
};
window.speechSynthesis.speak(feedbackSpeech);
} else {
document.removeEventListener('focusin', screenReader.handleFocus);
window.speechSynthesis.cancel();
const feedbackSpeech = new SpeechSynthesisUtterance('Screen reader off');
feedbackSpeech.lang = 'en-US';
feedbackSpeech.onerror = function(event) {
console.warn('Speech synthesis feedback error:', event.error);
};
window.speechSynthesis.speak(feedbackSpeech);
}
} catch (error) {
console.warn('Screen reader toggle error:', error);
return false;
}
return true;
},
};
// Voice control functionality
const voiceControl = {
isActive: localStorage.getItem('voiceControl') === 'true',
recognition: null,
isSupported: 'SpeechRecognition' in window || 'webkitSpeechRecognition' in window,
retryCount: 0,
maxRetries: 3,
toggle: function (isActive) {
if (!voiceControl.isSupported) {
console.warn('Speech Recognition API is not supported in this browser.');
return false;
}
voiceControl.isActive = isActive;
localStorage.setItem('voiceControl', isActive);
try {
if (isActive) {
voiceControl.startListening();
} else {
if (voiceControl.recognition) {
voiceControl.recognition.stop();
voiceControl.recognition = null;
}
voiceControl.retryCount = 0;
}
} catch (error) {
console.warn('Voice control toggle error:', error);
return false;
}
return true;
},
startListening: function () {
if (!voiceControl.isSupported) {
return;
}
try {
const SpeechRecognition = window.SpeechRecognition || window.webkitSpeechRecognition;
voiceControl.recognition = new SpeechRecognition();
voiceControl.recognition.interimResults = false;
voiceControl.recognition.lang = 'en-US';
voiceControl.recognition.continuous = false;
voiceControl.recognition.onstart = function () {
console.log('Voice control activated');
voiceControl.retryCount = 0;
};
voiceControl.recognition.onresult = function (event) {
try {
const command = event.results[0][0].transcript.toLowerCase();
voiceControl.handleVoiceCommand(command);
} catch (error) {
console.warn('Voice command processing error:', error);
}
};
voiceControl.recognition.onerror = function (event) {
console.warn('Speech recognition error:', event.error);
if (event.error === 'no-speech' && voiceControl.retryCount < voiceControl.maxRetries) {
voiceControl.retryCount++;
setTimeout(() => {
if (voiceControl.isActive) {
voiceControl.startListening();
}
}, 1000);
}
};
voiceControl.recognition.onend = function () {
if (voiceControl.isActive && voiceControl.retryCount < voiceControl.maxRetries) {
setTimeout(() => {
if (voiceControl.isActive) {
voiceControl.startListening();
}
}, 100);
}
};
voiceControl.recognition.start();
} catch (error) {
console.warn('Voice control initialization error:', error);
}
},
handleVoiceCommand: function (command) {
console.log(`Received command: ${command}`);
try {
const commandMap = {
'show menu': 'snn-accessibility-button',
'open menu': 'snn-accessibility-button',
'accessibility menu': 'snn-accessibility-button',
'high contrast': 'highContrast',
'bigger text': 'biggerText',
'large text': 'biggerText',
'text spacing': 'textSpacing',
'pause animations': 'pauseAnimations',
'stop animations': 'pauseAnimations',
'hide images': 'hideImages',
'dyslexia friendly': 'dyslexiaFont',
'dyslexia font': 'dyslexiaFont',
'bigger cursor': 'biggerCursor',
'large cursor': 'biggerCursor',
'line height': 'lineHeight',
'align text': 'textAlign',
'text align': 'textAlign',
'screen reader': 'screenReader',
'voice command': 'voiceControl',
'voice control': 'voiceControl',
'reset all': 'resetAll',
'reset everything': 'resetAll',
};
if (command === 'show menu' || command === 'open menu' || command === 'accessibility menu') {
if (!menuCache.button) menuCache.init();
if (menuCache.button) {
menuCache.button.click();
}
return;
}
if (command === 'reset all' || command === 'reset everything') {
resetAccessibilitySettings();
return;
}
const localStorageKey = commandMap[command];
if (localStorageKey) {
// Use cached menu reference if available
if (!menuCache.menu) menuCache.init();
const button = menuCache.menu?.querySelector(
`.snn-accessibility-option[data-key='${localStorageKey}']`
);
if (button) {
button.click();
} else {
console.log('Button not found for command:', command);
}
} else {
console.log('Command not recognized:', command);
}
} catch (error) {
console.warn('Voice command handling error:', error);
}
},
};
// Create the accessibility menu
function createAccessibilityMenu() {
const menu = document.createElement('div');
menu.id = 'snn-accessibility-menu';
menu.style.display = 'none';
menu.setAttribute('role', 'dialog');
menu.setAttribute('aria-labelledby', 'snn-accessibility-title');
menu.setAttribute('aria-hidden', 'true');
const header = document.createElement('div');
header.classList.add('snn-header');
const title = document.createElement('h2');
title.classList.add('snn-title');
title.id = 'snn-accessibility-title';
title.textContent = 'Accessibility Tools';
const closeButton = document.createElement('button');
closeButton.className = 'snn-close';
closeButton.innerHTML = '&times;';
closeButton.setAttribute('aria-label', 'Close Accessibility Menu');
closeButton.addEventListener('click', function () {
closeMenu();
});
closeButton.addEventListener('keydown', function (e) {
if (e.key === 'Enter' || e.key === ' ') {
e.preventDefault();
closeMenu();
}
});
header.appendChild(title);
header.appendChild(closeButton);
menu.appendChild(header);
// Add accessibility options based on configuration
const options = [
{
text: 'Screen Reader',
key: 'screenReader',
customToggleFunction: screenReader.toggle,
icon: icons.screenReader,
requiresFeature: screenReader,
enabled: WIDGET_CONFIG.enableScreenReader,
},
{
text: 'Voice Command',
key: 'voiceControl',
customToggleFunction: voiceControl.toggle,
icon: icons.voiceControl,
requiresFeature: voiceControl,
enabled: WIDGET_CONFIG.enableVoiceControl,
},
{
text: 'High Contrast',
key: 'highContrast',
className: 'snn-high-contrast',
icon: icons.highContrast,
target: document.documentElement,
enabled: WIDGET_CONFIG.enableHighContrast,
},
{
text: 'Bigger Text',
key: 'biggerText',
className: 'snn-bigger-text',
icon: icons.biggerText,
enabled: WIDGET_CONFIG.enableBiggerText,
},
{
text: 'Text Spacing',
key: 'textSpacing',
className: 'snn-text-spacing',
icon: icons.textSpacing,
enabled: WIDGET_CONFIG.enableTextSpacing,
},
{
text: 'Pause Animations',
key: 'pauseAnimations',
className: 'snn-pause-animations',
icon: icons.pauseAnimations,
enabled: WIDGET_CONFIG.enablePauseAnimations,
},
{
text: 'Hide Images',
key: 'hideImages',
icon: icons.hideImages,
customToggleFunction: toggleHideImages,
enabled: WIDGET_CONFIG.enableHideImages,
},
{
text: 'Dyslexia Friendly',
key: 'dyslexiaFont',
className: 'snn-dyslexia-font',
icon: icons.dyslexiaFont,
enabled: WIDGET_CONFIG.enableDyslexiaFont,
},
{
text: 'Bigger Cursor',
key: 'biggerCursor',
className: 'snn-bigger-cursor',
icon: icons.biggerCursor,
enabled: WIDGET_CONFIG.enableBiggerCursor,
},
{
text: 'Line Height',
key: 'lineHeight',
className: 'snn-line-height',
icon: icons.lineHeight,
enabled: WIDGET_CONFIG.enableLineHeight,
},
{
text: 'Text Align',
key: 'textAlign',
className: 'snn-text-align',
icon: icons.textAlign,
enabled: WIDGET_CONFIG.enableTextAlign,
},
{
text: 'Reading Mode',
key: 'readingMode',
className: 'snn-reading-mode',
icon: icons.readingMode,
enabled: WIDGET_CONFIG.enableReadingMode,
},
{
text: 'Enhanced Focus',
key: 'enhancedFocus',
className: 'snn-enhanced-focus',
icon: icons.enhancedFocus,
enabled: WIDGET_CONFIG.enableEnhancedFocus,
},
{
text: 'Reduced Motion',
key: 'reducedMotion',
className: 'snn-reduced-motion',
icon: icons.reducedMotion,
enabled: WIDGET_CONFIG.enableReducedMotion,
},
];
// Add enabled toggle options
options.forEach((option) => {
if (option.enabled) {
const button = createToggleButton(
option.text,
option.key,
option.className,
option.target,
option.customToggleFunction,
option.icon,
option.requiresFeature
);
menu.appendChild(button);
}
});
// Add action buttons (font selection and color filters) if enabled
if (WIDGET_CONFIG.enableFontSelection) {
const fontButton = createActionButton('Font Selection', handleFontSelection, icons.fontSelection);
menu.appendChild(fontButton);
}
if (WIDGET_CONFIG.enableColorFilter) {
const colorButton = createActionButton('Color Filter', handleColorFilter, icons.colorFilter);
menu.appendChild(colorButton);
}
// Reset All Button
const resetButton = document.createElement('button');
resetButton.innerHTML = `<span class="snn-icon">${icons.resetAll}</span><span class="snn-button-text">Reset All</span>`;
resetButton.setAttribute('aria-label', 'Reset All Accessibility Settings');
resetButton.classList.add('snn-accessibility-option');
resetButton.addEventListener('click', resetAccessibilitySettings);
menu.appendChild(resetButton);
document.body.appendChild(menu);
}
// ===========================================
// MENU MANAGEMENT
// ===========================================
// Cache for menu elements
const menuCache = {
menu: null,
button: null,
closeButton: null,
init: function() {
this.menu = document.getElementById('snn-accessibility-menu');
this.button = document.getElementById('snn-accessibility-button');
this.closeButton = this.menu?.querySelector('.snn-close');
}
};
// Menu control functions (optimized)
function toggleMenu() {
if (!menuCache.menu) menuCache.init();
const isOpen = menuCache.menu.style.display === 'block';
if (isOpen) {
closeMenu();
} else {
openMenu();
}
}
function openMenu() {
if (!menuCache.menu) menuCache.init();
menuCache.menu.style.display = 'block';
menuCache.menu.setAttribute('aria-hidden', 'false');
if (menuCache.closeButton) {
menuCache.closeButton.focus();
}
// Add keyboard navigation
document.addEventListener('keydown', handleMenuKeyboard);
}
function closeMenu() {
if (!menuCache.menu) menuCache.init();
menuCache.menu.style.display = 'none';
menuCache.menu.setAttribute('aria-hidden', 'true');
if (menuCache.button) {
menuCache.button.focus();
}
// Remove keyboard navigation
document.removeEventListener('keydown', handleMenuKeyboard);
}
// Cache for keyboard navigation elements
let keyboardCache = {
focusableElements: null,
lastUpdate: 0,
getFocusableElements: function() {
const now = Date.now();
if (!this.focusableElements || now - this.lastUpdate > 1000) {
if (menuCache.menu) {
this.focusableElements = {
all: menuCache.menu.querySelectorAll('button, [href], input, select, textarea, [tabindex]:not([tabindex="-1"])'),
options: Array.from(menuCache.menu.querySelectorAll('.snn-accessibility-option, .snn-close'))
};
this.lastUpdate = now;
}
}
return this.focusableElements;
}
};
function handleMenuKeyboard(e) {
if (!menuCache.menu || menuCache.menu.style.display !== 'block') return;
if (e.key === 'Escape') {
e.preventDefault();
closeMenu();
return;
}
const elements = keyboardCache.getFocusableElements();
if (!elements) return;
if (e.key === 'Tab') {
const firstElement = elements.all[0];
const lastElement = elements.all[elements.all.length - 1];
if (e.shiftKey) {
if (document.activeElement === firstElement) {
e.preventDefault();
lastElement.focus();
}
} else {
if (document.activeElement === lastElement) {
e.preventDefault();
firstElement.focus();
}
}
}
if (e.key === 'ArrowDown' || e.key === 'ArrowUp') {
e.preventDefault();
const currentIndex = elements.options.indexOf(document.activeElement);
let nextIndex;
if (e.key === 'ArrowDown') {
nextIndex = currentIndex === elements.options.length - 1 ? 0 : currentIndex + 1;
} else {
nextIndex = currentIndex === 0 ? elements.options.length - 1 : currentIndex - 1;
}
elements.options[nextIndex].focus();
}
}
// ===========================================
// INITIALIZATION
// ===========================================
// Initialize the widget
function initAccessibilityWidget() {
injectStyles();
applySettings();
createAccessibilityButton();
createAccessibilityMenu();
}
// ===========================================
// WIDGET BOOTSTRAP
// ===========================================
// Load the widget when the DOM is fully loaded
if (document.readyState === 'loading') {
document.addEventListener('DOMContentLoaded', initAccessibilityWidget);
} else {
initAccessibilityWidget();
}
/*
===========================================
WIDGET FEATURES SUMMARY:
Core Features:
- High contrast mode
- Text size adjustment
- Text spacing modification
- Animation pausing
- Image hiding
- Dyslexia-friendly font
- Cursor size adjustment
- Line height adjustment
- Text alignment
Advanced Features:
- Screen reader with speech synthesis
- Voice control with speech recognition
- Reading mode
- Enhanced focus indicators
- Reduced motion mode
- Font selection (Arial, Times, Verdana)
- Color blindness filters (Protanopia, Deuteranopia, Tritanopia, Grayscale)
Technical Features:
- Persistent settings via localStorage
- Full keyboard navigation
- ARIA compliance
- Error handling for browser compatibility
- Performance optimization with DOM caching
- Single file deployment
===========================================
*/
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