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/**
* Trading Pairs Loader - Provides cryptocurrency list for combo boxes
* Version: 1.0.0
* Updated: 2025-12-06
*/
class TradingPairsLoader {
constructor() {
this.pairs = null;
this.loaded = false;
this.loading = false;
this.loadPromise = null;
}
/**
* Load cryptocurrency pairs from JSON file
* @returns {Promise<Array>} Array of cryptocurrency objects
*/
async load() {
// Return cached data if already loaded
if (this.loaded && this.pairs) {
return this.pairs;
}
// Return existing promise if already loading
if (this.loading && this.loadPromise) {
return this.loadPromise;
}
// Start loading
this.loading = true;
this.loadPromise = this._fetchPairs();
try {
this.pairs = await this.loadPromise;
this.loaded = true;
console.log(`✅ [TradingPairs] Loaded ${this.pairs.length} cryptocurrencies`);
return this.pairs;
} catch (error) {
console.error('❌ [TradingPairs] Failed to load:', error);
this.loaded = false;
// Return fallback data
return this._getFallbackPairs();
} finally {
this.loading = false;
}
}
/**
* Fetch pairs from JSON file
*/
async _fetchPairs() {
const response = await fetch('/static/data/cryptocurrencies.json');
if (!response.ok) {
throw new Error(`HTTP ${response.status}: ${response.statusText}`);
}
const data = await response.json();
return data.cryptocurrencies || [];
}
/**
* Get fallback pairs if loading fails
*/
_getFallbackPairs() {
return [
{id: "bitcoin", symbol: "BTC", name: "Bitcoin", pair: "BTCUSDT", rank: 1},
{id: "ethereum", symbol: "ETH", name: "Ethereum", pair: "ETHUSDT", rank: 2},
{id: "binancecoin", symbol: "BNB", name: "BNB", pair: "BNBUSDT", rank: 3},
{id: "solana", symbol: "SOL", name: "Solana", pair: "SOLUSDT", rank: 4},
{id: "ripple", symbol: "XRP", name: "XRP", pair: "XRPUSDT", rank: 5},
{id: "cardano", symbol: "ADA", name: "Cardano", pair: "ADAUSDT", rank: 6},
{id: "dogecoin", symbol: "DOGE", name: "Dogecoin", pair: "DOGEUSDT", rank: 7},
{id: "matic-network", symbol: "MATIC", name: "Polygon", pair: "MATICUSDT", rank: 8},
{id: "polkadot", symbol: "DOT", name: "Polkadot", pair: "DOTUSDT", rank: 9},
{id: "avalanche", symbol: "AVAX", name: "Avalanche", pair: "AVAXUSDT", rank: 10}
];
}
/**
* Get all pairs
*/
async getPairs() {
return await this.load();
}
/**
* Get top N pairs by rank
*/
async getTopPairs(n = 50) {
const pairs = await this.load();
return pairs.slice(0, n);
}
/**
* Search pairs by symbol, name, or id
*/
async searchPairs(query) {
const pairs = await this.load();
const lowerQuery = query.toLowerCase();
return pairs.filter(p =>
p.symbol.toLowerCase().includes(lowerQuery) ||
p.name.toLowerCase().includes(lowerQuery) ||
p.id.toLowerCase().includes(lowerQuery)
);
}
/**
* Get pair by symbol
*/
async getPairBySymbol(symbol) {
const pairs = await this.load();
return pairs.find(p => p.symbol.toUpperCase() === symbol.toUpperCase());
}
/**
* Populate a select element with trading pairs
* @param {HTMLSelectElement} selectElement - The select element to populate
* @param {Object} options - Configuration options
*/
async populateSelect(selectElement, options = {}) {
const {
limit = null,
placeholder = "Select a cryptocurrency...",
selectedValue = null,
showRank = true,
showSymbol = true,
addAllOption = false
} = options;
// Add placeholder option
if (placeholder) {
const placeholderOption = document.createElement('option');
placeholderOption.value = '';
placeholderOption.textContent = placeholder;
placeholderOption.disabled = true;
placeholderOption.selected = !selectedValue;
selectElement.appendChild(placeholderOption);
}
// Add "All" option if requested
if (addAllOption) {
const allOption = document.createElement('option');
allOption.value = 'all';
allOption.textContent = '🌐 All Cryptocurrencies';
selectElement.appendChild(allOption);
}
// Load pairs
const pairs = limit ? await this.getTopPairs(limit) : await this.getPairs();
// Populate options
pairs.forEach(pair => {
const option = document.createElement('option');
option.value = pair.symbol;
option.dataset.pair = pair.pair;
option.dataset.id = pair.id;
// Build option text
let text = '';
if (showRank) text += `#${pair.rank} `;
text += pair.name;
if (showSymbol) text += ` (${pair.symbol})`;
option.textContent = text;
// Set selected if matches
if (selectedValue && (
pair.symbol.toUpperCase() === selectedValue.toUpperCase() ||
pair.pair === selectedValue ||
pair.id === selectedValue
)) {
option.selected = true;
}
selectElement.appendChild(option);
});
console.log(`✅ [TradingPairs] Populated select with ${pairs.length} options`);
}
/**
* Create a searchable dropdown with autocomplete
* @param {HTMLElement} container - Container element
* @param {Object} options - Configuration options
*/
async createSearchableDropdown(container, options = {}) {
const {
limit = null,
placeholder = "Search cryptocurrency...",
onSelect = null,
className = 'crypto-searchable-dropdown'
} = options;
// Load pairs
const allPairs = limit ? await this.getTopPairs(limit) : await this.getPairs();
// Create HTML structure
container.innerHTML = `
<div class="${className}">
<div class="crypto-search-input-wrapper">
<input
type="text"
class="crypto-search-input form-input"
placeholder="${placeholder}"
autocomplete="off"
/>
<div class="crypto-dropdown-icon">▼</div>
</div>
<div class="crypto-dropdown-list" style="display: none;">
<div class="crypto-dropdown-items"></div>
</div>
</div>
`;
const input = container.querySelector('.crypto-search-input');
const dropdownList = container.querySelector('.crypto-dropdown-list');
const dropdownItems = container.querySelector('.crypto-dropdown-items');
let filteredPairs = allPairs;
// Render dropdown items
const renderItems = (pairs) => {
dropdownItems.innerHTML = '';
pairs.forEach(pair => {
const item = document.createElement('div');
item.className = 'crypto-dropdown-item';
item.dataset.symbol = pair.symbol;
item.dataset.pair = pair.pair;
item.dataset.id = pair.id;
item.innerHTML = `
<span class="crypto-rank">#${pair.rank}</span>
<span class="crypto-name">${pair.name}</span>
<span class="crypto-symbol">${pair.symbol}</span>
`;
item.addEventListener('click', () => {
input.value = `${pair.name} (${pair.symbol})`;
dropdownList.style.display = 'none';
if (onSelect) onSelect(pair);
});
dropdownItems.appendChild(item);
});
};
// Initial render
renderItems(filteredPairs);
// Search functionality
input.addEventListener('input', (e) => {
const query = e.target.value.toLowerCase();
filteredPairs = allPairs.filter(p =>
p.name.toLowerCase().includes(query) ||
p.symbol.toLowerCase().includes(query)
);
renderItems(filteredPairs);
dropdownList.style.display = 'block';
});
// Show/hide dropdown
input.addEventListener('focus', () => {
dropdownList.style.display = 'block';
});
document.addEventListener('click', (e) => {
if (!container.contains(e.target)) {
dropdownList.style.display = 'none';
}
});
console.log(`✅ [TradingPairs] Created searchable dropdown with ${allPairs.length} items`);
}
}
// Create singleton instance
const tradingPairsLoader = new TradingPairsLoader();
// Export for use in other modules
if (typeof module !== 'undefined' && module.exports) {
module.exports = { TradingPairsLoader, tradingPairsLoader };
}
// Make available globally
window.tradingPairsLoader = tradingPairsLoader;
window.TradingPairsLoader = TradingPairsLoader;
console.log('✅ [TradingPairs] Loader initialized');
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