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behavior.js
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behavior.js
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/**
* Retrieve the products
*/
function loadProducts() {
// Create a request
var http_request = new XMLHttpRequest();
// Function to handle the output
http_request.onreadystatechange = function () {
if (http_request.readyState === 4 && http_request.status === 200) {
// Parse the json data
const jsonObj = JSON.parse(http_request.responseText);
jsonObj.forEach(product => {
// Get the product list and create a structure to add each product to the basket
const ul = document.querySelectorAll('div.product-list ul')[0];
const li = document.createElement("li");
const div = document.createElement("div");
div.appendChild(document.createTextNode(product.name));
const p = document.createElement("p");
p.appendChild(document.createTextNode(product.price + '€'));
div.appendChild(p);
const buttonDiv = document.createElement("div");
const plusButton = document.createElement('input');
plusButton.setAttribute('type', 'button');
plusButton.setAttribute('value', 'Add 1 unit');
plusButton.onclick = function () {
addProduct(product.code, 1)
};
buttonDiv.appendChild(plusButton);
const minusButton = document.createElement('input');
minusButton.setAttribute('type', 'button');
minusButton.setAttribute('value', 'Remove 1 unit');
minusButton.onclick = function () {
addProduct(product.code, -1)
};
buttonDiv.appendChild(minusButton);
div.appendChild(buttonDiv);
li.appendChild(div);
ul.appendChild(li);
});
}
};
// Send the request
http_request.open("GET", "http://127.0.0.1:5000/shop/products", true);
http_request.send();
}
/**
* Create a new basket
*/
function createBasket() {
var http_request = new XMLHttpRequest();
http_request.onreadystatechange = function () {
if (http_request.readyState === 4 && http_request.status === 200) {
// Parse the basket id and set it in the hidden input
const basketId = JSON.parse(http_request.responseText).basket_id;
document.getElementsByName("basket-id")[0].value = basketId;
// Change the basket button text and onclick
const button = document.getElementsByName("basket-button")[0];
button.value = "Delete basket";
button.onclick = deleteBasket;
}
};
http_request.open("POST", "http://127.0.0.1:5000/shop/create-basket", true);
http_request.send();
}
/**
* Remove the current basket
*/
function deleteBasket() {
var basketId = document.getElementsByName("basket-id")[0].value;
if (!basketId) {
alert('You have to create a basket in order to delete it.');
return;
}
const http_request = new XMLHttpRequest();
http_request.onreadystatechange = function () {
if (http_request.readyState === 4 && http_request.status === 200) {
// Remove the basket id from the hidden input
document.getElementsByName("basket-id")[0].value = null;
// Empty the basket list
document.querySelectorAll('div.basket ul')[0].innerHTML = "";
// Empty the checkout price
document.getElementById("price").innerHTML = "";
// Change the basket button text and onclick
const button = document.getElementsByName("basket-button")[0];
button.value = "Create basket";
button.onclick = createBasket;
} else if (http_request.readyState === 4 && http_request.status === 400) {
const jsonObj = JSON.parse(http_request.responseText);
if (jsonObj.msg) {
alert(jsonObj.msg);
}
}
};
http_request.open("DELETE", "http://127.0.0.1:5000/shop/" + basketId, true);
http_request.send();
}
/**
* Add a product to the basket
*
* @param code Code of the product
* @param units Number of units of the product
*/
function addProduct(code, units) {
var basketId = document.getElementsByName("basket-id")[0].value;
if (!basketId) {
alert('You have to create a basket in order to add a product.');
return;
}
var http_request = new XMLHttpRequest();
http_request.onreadystatechange = function () {
if (http_request.readyState === 4 && http_request.status === 200) {
const jsonObj = JSON.parse(http_request.responseText);
// Empty the basket list
const ul = document.querySelectorAll('div.basket ul')[0];
ul.innerHTML = "";
for (var prop in jsonObj) {
const li = document.createElement("li");
li.appendChild(document.createTextNode(prop + ' (' + jsonObj[prop] + ')'));
ul.appendChild(li);
}
checkout();
} else if (http_request.readyState === 4 && http_request.status === 400) {
const jsonObj = JSON.parse(http_request.responseText);
if (jsonObj.msg) {
alert(jsonObj.msg);
}
}
};
http_request.open("PUT", "http://127.0.0.1:5000/shop/" + basketId + "/update-product?product_code=" + code + '&quantity=' + units, true);
http_request.send();
}
/**
* Calculate the price of the products of the basket applying discounts
*/
function checkout() {
var basketId = document.getElementsByName("basket-id")[0].value;
if (!basketId) {
alert('You have to create a basket in order to checkout.');
return;
}
var http_request = new XMLHttpRequest();
http_request.onreadystatechange = function () {
if (http_request.readyState === 4 && http_request.status === 200) {
// Parse the price and set it in the div
const price = JSON.parse(http_request.responseText).price;
const priceDiv = document.getElementById("price");
priceDiv.innerHTML = "";
priceDiv.appendChild(document.createTextNode(price + '€'));
} else if (http_request.readyState === 4 && http_request.status === 400) {
const jsonObj = JSON.parse(http_request.responseText);
if (jsonObj.msg) {
alert(jsonObj.msg);
}
}
};
http_request.open("GET", "http://127.0.0.1:5000/shop/" + basketId + "/checkout", true);
http_request.send();
}
window.onload = loadProducts;