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index.js
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index.js
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async function queryApi() {
try {
// Fetch the current price of Ether (ETH) in dollars from CoinGecko
const response = await axios.get(
"https://api.coingecko.com/api/v3/simple/price",
{
params: {
ids: "ethereum",
vs_currencies: "usd",
},
}
);
return response;
} catch (error) {
console.error("Error fetching exchange rate:", error);
return null;
}
}
async function convertEthToDollars(value) {
try {
const response = await queryApi();
const ethToUsdRate = response.data.ethereum.usd;
const dollarsValue = value * ethToUsdRate;
return dollarsValue;
} catch (error) {
console.error("Error converting ETH to dollars:", error);
return null;
}
}
async function convertDollarsToEth(value) {
try {
const response = await queryApi();
const ethToUsdRate = response.data.ethereum.usd;
const ethValue = value / ethToUsdRate;
return ethValue;
} catch (error) {
console.error("Error converting ETH to dollars:", error);
return null;
}
}
function removeCurrencyAndNonNumeric(inputString) {
// Use a regular expression to match numbers (including negative) and decimal points
const pattern = /[-+]?([0-9]*\.[0-9]+|[0-9]+)/g;
const cleanedArray = inputString.match(pattern);
// Join the matched numbers and decimal points back into a single string
const cleanedString = cleanedArray ? cleanedArray.join("") : "";
return cleanedString;
}
let eth = document.getElementById("eth-input");
let dollars = document.getElementById("usd-input");
function convertEthToUsd() {
let ethValue = removeCurrencyAndNonNumeric(eth.value);
if (!ethValue) {
eth.focus();
return;
}
convertEthToDollars(ethValue).then((dollar) => {
dollars.value = dollar.toFixed(2);
});
}
eth.addEventListener("input", convertEthToUsd);
function convertUsdToEth() {
let dollarsValue = removeCurrencyAndNonNumeric(dollars.value);
if (!dollarsValue) {
dollars.focus();
return;
}
convertDollarsToEth(dollarsValue).then((ether) => {
eth.value = ether.toFixed(4);
});
}
dollars.addEventListener("input", convertUsdToEth);
function isMobileDevice() {
return window.innerWidth < 768;
}
const arrows = document.getElementById("arrows");
let isClicked = false;
if (isMobileDevice()) {
arrows.innerHTML = `<i class="fa-solid fa-arrows-up-down"></i>`;
const mobileDropdowns = document.querySelectorAll(".mobile-dropdown");
mobileDropdowns.forEach(function (dropdown) {
const trigger = dropdown.querySelector("a");
const menu = dropdown.querySelector(".mobile-dropdown-menu");
trigger.addEventListener("click", function (event) {
event.preventDefault();
if (isClicked) {
menu.style.display = "none";
} else {
menu.style.display = "block";
}
isClicked = !isClicked;
});
});
} else {
arrows.innerHTML = `<i class="fa-solid fa-arrow-right-arrow-left"></i>`;
}
window.addEventListener("DOMContentLoaded", convertEthToUsd);
document.getElementById("convert-button").addEventListener("click", () => {
if (eth.value) {
convertEthToUsd();
} else if (dollars.value) {
convertUsdToEth();
} else {
alert("Enter Ether or Dollars to convert");
}
});