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script.js
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script.js
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let years = document.querySelector(".years");
let btnYears = document.querySelectorAll(".btnYears");
let countriesButtons = document.querySelector(".countriesButtons");
let continentsButtons = document.querySelector(".continentsButtons");
let continents = document.querySelector("#continents");
let errorMes = document.querySelector(".errorMes");
let btnContinent = document.querySelectorAll(".btnContinent");
const ctx = document.getElementById("myChart");
let arrOfCountryButton = [];
let arrOfContinentsCountry = [];
let arrOfPopulationsCountry = [];
let arrOfCities = [];
let arrOfPopulationsCities = [];
let isChart = false;
let whichYear = 0;
let myChart;
let data1;
years.style.visibility = "hidden";
errorMes.style.display = "none";
continentsButtons.addEventListener("click", getContinent);
countriesButtons.addEventListener("click", getCountry);
years.addEventListener("click", changeYear);
async function getContinent(e) {
years.style.visibility = "hidden";
btnContinent.forEach((btn) => {
btn.style.border = "none";
});
if (e.target.value !== undefined) {
e.target.style.border = "2px solid red";
}
countriesButtons.style.visibility = "visible";
arrOfContinentsCountry = [];
arrOfPopulationsCountry = [];
arrOfCities = [];
arrOfPopulationsCities = [];
countriesButtons.innerHTML = " ";
try {
let continentData = await fetch(
`https://restcountries.com/v3.1/region/${e.target.value}`
);
if (!continentData.ok) throw new Error("error");
objContinentData = await continentData.json();
console.log(objContinentData);
objContinentData.forEach((oCD) => {
arrOfContinentsCountry.push(oCD.name.common);
arrOfPopulationsCountry.push(oCD.population);
let btnOfCountry = document.createElement("button");
btnOfCountry.style.border = "2px solid #fff";
btnOfCountry.style.borderRadius = "0.5rem";
btnOfCountry.style.background = "#fff";
btnOfCountry.classList.add("btnContinent");
btnOfCountry.innerText = `${oCD.name.common}`;
arrOfCountryButton.push(btnOfCountry);
countriesButtons.append(btnOfCountry);
});
} catch (err) {
console.error(err);
}
await drawChart(arrOfContinentsCountry, arrOfPopulationsCountry);
}
async function getCountry(event) {
arrOfPopulationsCities = [];
arrOfCities = [];
years.style.visibility = "visible";
if (event.target.className === "btnContinent") {
arrOfCountryButton.forEach((btnCountry) => {
btnCountry.style.border = "2px solid #fff";
});
event.target.style.border = "2px solid purple ";
}
ctx.style.visibility = "visible";
errorMes.style.display = "none";
const res = await fetch(
"https://countriesnow.space/api/v0.1/countries/population/cities/filter",
{
method: "POST",
headers: {
Accept: "application/json",
"Content-Type": "application/json",
},
body: JSON.stringify({
limit: 1000,
order: "asc",
orderBy: "name",
country: `${event.target.innerText}`,
}),
}
);
if (!res.ok) {
errorMes.style.display = "block";
ctx.style.visibility = "hidden";
throw new Error("error");
}
data1 = await res.json();
console.log(data1.data[1]);
btnYears.forEach((someYear) => {
someYear.style.border = "none";
});
btnYears[0].style.border = "2px solid red";
whichYear = 0;
data1.data.forEach((city) => {
arrOfCities.push(city.city);
arrOfPopulationsCities.push(city.populationCounts[0].value);
});
await drawChart(arrOfCities, arrOfPopulationsCities);
}
function changeYear(eClick) {
btnYears.forEach((someYear) => {
someYear.style.border = "none";
});
eClick.target.style.border = "2px solid red";
btnYears.forEach((x, index) => {
if (x.value === eClick.target.value) whichYear = index;
});
if (data1.data[1].populationCounts.length > whichYear) {
errorMes.style.display = "none";
arrOfPopulationsCities = [];
arrOfCities = [];
data1.data.forEach((city) => {
arrOfCities.push(city.city);
arrOfPopulationsCities.push(city.populationCounts[whichYear].value);
});
drawChart(arrOfCities, arrOfPopulationsCities);
console.log("whichYear:", whichYear);
} else {
errorMes.style.display = "block";
}
}
function drawChart(arrOfContinentsCountry, arrOfPopulationsCountry) {
arrOfCities = [];
arrOfPopulationsCities = [];
if (isChart === true) {
myChart.destroy();
}
isChart = true;
myChart = new Chart(ctx, {
type: "line",
data: {
labels: arrOfContinentsCountry,
datasets: [
{
label: "Population",
data: arrOfPopulationsCountry,
borderWidth: 1,
},
],
},
options: {
scales: {
y: {
beginAtZero: true,
},
},
},
});
}