[Local Storage] Stores a value in browser local storage #js #localstorage #cookies

main.js

var alerted = getWithExpiry('covid19');
if (alerted != 'yes') { 
	$('.alert-dismissible.orange-bg.pr-0').addClass('d-flex');
}

$('body').on('close.bs.alert', '.alert-dismissible.orange-bg.pr-0', function () {
	// localStorage.setItem('covid19','yes');
	setWithExpiry('covid19', 'yes', 3600000)
});

function setWithExpiry(key, value, ttl) {
	var now = new Date()

	// `item` is an object which contains the original value
	// as well as the time when it's supposed to expire
	var item = {
		value: value,
		expiry: now.getTime() + ttl
	}
	localStorage.setItem(key, JSON.stringify(item))
}

function getWithExpiry(key) {
	var itemStr = localStorage.getItem(key)

	// if the item doesn't exist, return null
	if (!itemStr) {
		return null
	}

	var item = JSON.parse(itemStr)
	var now = new Date()

	// compare the expiry time of the item with the current time
	if (now.getTime() > item.expiry) {
		// If the item is expired, delete the item from storage
		// and return null
		localStorage.removeItem(key)
		return null
	}
	return item.value
}