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script.js
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script.js
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var dateField = document.getElementById('date');
var age18 = document.getElementById('18+');
var date = document.getElementById('date');
var results = document.getElementById('results');
var state = document.getElementById('state');
var district = document.getElementById('district');
var states = {
"Andaman and Nicobar Islands": 1,
"Andhra Pradesh": 2,
"Arunachal Pradesh": 3,
"Assam": 4,
"Bihar": 5,
"Chandigarh": 6,
"Chhattisgarh": 7,
"Dadra and Nagar Haveli": 8,
"Daman and Diu": 37,
"Delhi": 9,
"Goa": 10,
"Gujarat": 11,
"Haryana": 12,
"Himachal Pradesh": 13,
"Jammu and Kashmir": 14,
"Jharkhand": 15,
"Karnataka": 16,
"Kerala": 17,
"Ladakh": 18,
"Lakshadweep": 19,
"Madhya Pradesh": 20,
"Maharashtra": 21,
"Manipur": 22,
"Meghalaya": 23,
"Mizoram": 24,
"Nagaland": 25,
"Odisha": 26,
"Puducherry": 27,
"Punjab": 28,
"Rajasthan": 29,
"Sikkim": 30,
"Tamil Nadu": 31,
"Telangana": 32,
"Tripura": 33,
"Uttar Pradesh": 34,
"Uttarakhand": 35,
"West Bengal": 36
}
var districts = {};
function getDate() {
const d = dateField.value;
return d.split('-').reverse().join('-')
}
function getAge() {
return age18.checked ? 18 : 45;
}
function setStates() {
for (const s in states) {
var opt = document.createElement('option');
opt.value = states[s]
opt.text = s
state.appendChild(opt)
}
}
function setDistricts(d = null) {
var req = new XMLHttpRequest();
const url = `https://cdn-api.co-vin.in/api/v2/admin/location/districts/${state.value}`
req.open('GET', url, true);
req.responseType = 'json';
req.onload = function() {
var status = req.status;
if (status === 200) {
districts = req.response.districts;
const def = district.children[0]
district.innerHTML = '';
district.appendChild(def)
for (const d of districts) {
var opt = document.createElement('option');
opt.value = d.district_id;
opt.text = d.district_name;
district.appendChild(opt)
}
if (d) district.value = d;
}
};
req.send();
}
function getDistrictId() {
return district.value;
}
function get(callback) {
var req = new XMLHttpRequest();
const district_id = district.value;
const date = getDate();
const url = `https://cdn-api.co-vin.in/api/v2/appointment/sessions/public/calendarByDistrict?district_id=${district_id}&date=${date}`;
req.open('GET', url, true);
req.responseType = 'json';
req.onload = function() {
var status = req.status;
if (status === 200)
callback(null, req.response);
else
callback(status, req.response);
};
req.send();
}
function check() {
get((err, res) => {
if (err) return alert(`Error: ${err}`)
const date = getDate();
const age = getAge();
let count = 0;
const available = res.centers.filter(center => {
count += center.sessions[0].min_age_limit === age;
return center.sessions.some(s => (s.available_capacity > 0 && s.min_age_limit === age))
})
console.log(available);
const template = center => `
<div class="p-1" style="border: 1px solid black">
<b>${center.name}, Pincode: ${center.pincode}</b><br>
${center.sessions.filter(s => s.available_capacity > 0).map(s => s.date + ': ' + s.available_capacity).join('<br>')}<br>
</div>
`;
if (available.length === 0) {
results.innerHTML = `
<div class="alert alert-danger">
Found ${count} centers listed for ${age}+ age group in your district, and all of them are fully booked right now.<br>
Please keep checking for updates.
</div>
`;
} else {
results.innerHTML = `<div class="alert alert-success">Found <b>${count} centers</b> listed for ${age}+ age group in your district, out of which <b>${available.length} centers</b> have available slots, head over to the <b><a href="https://selfregistration.cowin.gov.in/" target="_blank">official CoWIN website</a></b> to book the slot</div>`
results.innerHTML += available.map(c => template(c)).join(' ')
}
})
}
state.onchange = () => {
localStorage.setItem('state', state.value)
setDistricts()
}
district.onchange = () => {
localStorage.setItem('district', district.value)
}
window.onload = () => {
const s = localStorage.getItem('state')
const d = localStorage.getItem('district')
setStates();
if (s) {
state.value = s;
setDistricts(d);
}
date.valueAsDate = new Date();
}