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Refactor: Migrate monolithic HTML UI to native Web Components #154

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1,050 changes: 1,050 additions & 0 deletions public/components/current-weather.js
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986 changes: 986 additions & 0 deletions public/components/forecast-list.js
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305 changes: 305 additions & 0 deletions public/components/weather-header.js
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Original file line number Diff line number Diff line change
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class WeatherHeader extends HTMLElement {
constructor() {
super();
this.attachShadow({ mode: 'open' });
this._lang = 'en';
this._theme = 'light';
this._unit = 'C';
}

static get observedAttributes() {
return ['lang', 'theme', 'unit'];
}

attributeChangedCallback(name, oldValue, newValue) {
if (oldValue === newValue) return;
if (name === 'lang') {
this._lang = newValue;
this.updateTranslations();
} else if (name === 'theme') {
this._theme = newValue;
this.updateTheme();
} else if (name === 'unit') {
this._unit = newValue;
this.updateUnit();
}
}

connectedCallback() {
this.render();
this.setupEventListeners();
}

render() {
const t = window.translations?.[this._lang] || window.translations?.['en'] || {};

this.shadowRoot.innerHTML = `
<style>
:host {
display: block;
width: 100%;
}
header {
text-align: left;
margin-bottom: 28px;
display: grid;
grid-template-columns: minmax(0, 1fr) auto auto auto;
column-gap: 14px;
row-gap: 18px;
align-items: center;
}
h1 {
font-size: 36px;
font-weight: 700;
background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
-webkit-background-clip: text;
-webkit-text-fill-color: transparent;
background-clip: text;
margin: 0;
letter-spacing: -0.5px;
line-height: 1.1;
}
.language-toggle {
background: rgba(255, 255, 255, 0.15);
border: 1px solid rgba(255, 255, 255, 0.3);
border-radius: 20px;
padding: 6px 12px;
color: inherit;
font-family: inherit;
font-weight: 600;
font-size: 14px;
cursor: pointer;
outline: none;
backdrop-filter: blur(5px);
transition: background 0.3s ease;
}
.language-toggle option {
color: #000;
}
.theme-toggle {
display: flex;
align-items: center;
gap: 6px;
padding: 8px 16px;
border: 1.5px solid rgba(102, 126, 234, 0.3);
border-radius: 50px;
background: rgba(102, 126, 234, 0.08);
color: #2d3748;
font-family: inherit;
font-size: 14px;
font-weight: 600;
cursor: pointer;
white-space: nowrap;
flex-shrink: 0;
transition: background 0.3s ease, border-color 0.3s ease, color 0.3s ease, transform 0.15s ease, box-shadow 0.3s ease;
user-select: none;
}
.theme-toggle:hover {
background: rgba(102, 126, 234, 0.15);
border-color: #667eea;
transform: translateY(-1px);
}
.theme-toggle:active {
transform: translateY(0);
}
.toggle-icon {
font-style: normal;
font-size: 16px;
transition: transform 0.4s ease;
line-height: 1;
}
.unit-toggle {
display: flex;
border: 1.5px solid rgba(102, 126, 234, 0.3);
border-radius: 50px;
overflow: hidden;
flex-shrink: 0;
}
.unit-btn {
padding: 8px 14px;
border: none;
background: transparent;
color: #718096;
font-family: inherit;
font-size: 13px;
font-weight: 600;
cursor: pointer;
transition: background 0.2s ease, color 0.2s ease;
}
.unit-btn:not(:last-child) {
border-right: 1.5px solid rgba(102, 126, 234, 0.2);
}
.unit-btn.active {
background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
color: white;
}
.unit-btn:not(.active):hover {
background: rgba(102, 126, 234, 0.1);
color: #667eea;
}

/* Dark Mode Scopes */
:host-context(.dark-mode) .theme-toggle {
background: rgba(251, 191, 36, 0.08);
border-color: rgba(251, 191, 36, 0.3);
color: #fbbf24;
}
:host-context(.dark-mode) .theme-toggle:hover {
background: rgba(251, 191, 36, 0.15);
border-color: #fbbf24;
}
:host-context(.dark-mode) .toggle-icon {
transform: rotate(20deg);
}
:host-context(.dark-mode) .unit-toggle {
border-color: rgba(100, 116, 139, 0.4);
}
:host-context(.dark-mode) .unit-btn {
color: #94a3b8;
}
:host-context(.dark-mode) .unit-btn:not(:last-child) {
border-right-color: rgba(100, 116, 139, 0.3);
}
:host-context(.dark-mode) .unit-btn:not(.active):hover {
background: rgba(102, 126, 234, 0.15);
color: #a5b4fc;
}

@media (max-width: 768px) {
header {
grid-template-columns: minmax(0, 1fr) auto auto;
grid-template-areas:
"title title title"
"lang theme units";
row-gap: 12px;
}
h1 {
grid-area: title;
font-size: 28px;
text-align: center;
}
.language-toggle {
grid-area: lang;
width: 100%;
}
.theme-toggle {
grid-area: theme;
width: 100%;
justify-content: center;
}
.unit-toggle {
grid-area: units;
width: 100%;
justify-content: center;
}
.unit-btn {
flex: 1;
text-align: center;
}
}
</style>
<header>
<h1 id="app-title">${t['appTitle'] || 'Weatherify ⛅'}</h1>

<select id="language-toggle" class="language-toggle" aria-label="Select language">
<option value="en">EN</option>
<option value="hi">HI</option>
<option value="es">ES</option>
<option value="fr">FR</option>
</select>

<button id="theme-toggle" class="theme-toggle" aria-label="Toggle dark mode" aria-pressed="false">
<span class="toggle-icon" aria-hidden="true">🌙</span>
<span class="toggle-label">${this._theme === 'dark' ? (t['themeLight'] || 'Light') : (t['themeDark'] || 'Dark')}</span>
</button>

<div class="unit-toggle" role="group" aria-label="Temperature unit">
<button class="unit-btn ${this._unit === 'C' ? 'active' : ''}" data-unit="C">°C</button>
<button class="unit-btn ${this._unit === 'F' ? 'active' : ''}" data-unit="F">°F</button>
<button class="unit-btn ${this._unit === 'K' ? 'active' : ''}" data-unit="K">K</button>
</div>
</header>
`;

this.shadowRoot.getElementById('language-toggle').value = this._lang;
this.updateThemeEffects();
}

setupEventListeners() {
const langToggle = this.shadowRoot.getElementById('language-toggle');
langToggle.addEventListener('change', (e) => {
const lang = e.target.value;
this.dispatchEvent(new CustomEvent('lang-change', {
detail: { lang },
bubbles: true,
composed: true
}));
});

const themeToggle = this.shadowRoot.getElementById('theme-toggle');
themeToggle.addEventListener('click', () => {
const newTheme = this._theme === 'dark' ? 'light' : 'dark';
this.dispatchEvent(new CustomEvent('theme-change', {
detail: { theme: newTheme },
bubbles: true,
composed: true
}));
});

const unitButtons = this.shadowRoot.querySelectorAll('.unit-btn');
unitButtons.forEach(btn => {
btn.addEventListener('click', (e) => {
const unit = btn.dataset.unit;
this.dispatchEvent(new CustomEvent('unit-change', {
detail: { unit },
bubbles: true,
composed: true
}));
});
});
}

updateTranslations() {
const t = window.translations?.[this._lang] || window.translations?.['en'] || {};
const titleEl = this.shadowRoot.getElementById('app-title');
if (titleEl) titleEl.textContent = t['appTitle'] || 'Weatherify ⛅';

const langToggle = this.shadowRoot.getElementById('language-toggle');
if (langToggle) langToggle.value = this._lang;

const labelEl = this.shadowRoot.querySelector('.toggle-label');
if (labelEl) {
labelEl.textContent = this._theme === 'dark' ? (t['themeLight'] || 'Light') : (t['themeDark'] || 'Dark');
}
}

updateTheme() {
const t = window.translations?.[this._lang] || window.translations?.['en'] || {};
const labelEl = this.shadowRoot.querySelector('.toggle-label');
if (labelEl) {
labelEl.textContent = this._theme === 'dark' ? (t['themeLight'] || 'Light') : (t['themeDark'] || 'Dark');
}
this.updateThemeEffects();
}

updateThemeEffects() {
const themeToggle = this.shadowRoot.getElementById('theme-toggle');
if (themeToggle) {
const isDark = this._theme === 'dark';
themeToggle.setAttribute('aria-pressed', String(isDark));
themeToggle.setAttribute('aria-label', isDark ? 'Switch to light theme' : 'Switch to dark theme');
themeToggle.title = isDark ? 'Switch to light theme' : 'Switch to dark theme';
const icon = themeToggle.querySelector('.toggle-icon');
if (icon) icon.textContent = isDark ? '☀️' : '🌙';
}
}

updateUnit() {
const buttons = this.shadowRoot.querySelectorAll('.unit-btn');
buttons.forEach(btn => {
btn.classList.toggle('active', btn.dataset.unit === this._unit);
});
}
}

customElements.define('weather-header', WeatherHeader);
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