我的购物篮对象无法正常工作。我想对每个产品库存请求的增量按钮点击次数进行求和,并将其存储在 localStorage 中(之后我计划从总数中减少库存数量,以限制新请求并在没有剩余库存时删除产品卡)。
我尝试使用 localStorage 分配不同的键来对每个产品进行正确的求和。
更新工作版本!
HTML:
<div id="stock-1">1</div>
<button onclick="basket.increaseStockQtyForProductUntilMaxRange({id:1, max:10}).setRequestedStockCountForProduct(1)">+</button><button onclick="basket.decreaseForProduct(1)">-</button><button onclick="basket.addProductRequestToBasket(1).setNewMaxIncrementForProduct(1).resetCounterForProduct(1)">add</button>
<div id="stock-2">1</div>
<button onclick="basket.increaseStockQtyForProductUntilMaxRange({id:2, max:10}).setRequestedStockCountForProduct(2)">+</button><button onclick="basket.decreaseForProduct(1)">-</button><button onclick="basket.addProductRequestToBasket(2).setNewMaxIncrementForProduct(2).resetCounterForProduct(2)">add</button>
<div id="stock-3">1</div>
<button onclick="basket.increaseStockQtyForProductUntilMaxRange({id:3, max:10}).setRequestedStockCountForProduct(3)">+</button><button onclick="basket.decreaseForProduct(3)">-</button><button onclick="basket.addProductRequestToBasket(3).setNewMaxIncrementForProduct(3).resetCounterForProduct(3)">add</button>
<hr>
VanillaJS:
/**
* A simple e-commerce basket snippet based on builder design pattern
*/
function Basket() {
this.requestedStockQtyForProduct = {};
this.remainingMaxRequestForProductStockQty = {};
}
Basket.prototype = {
/**
* @param {Integer} id Holds div id data
*/
stockCountOfProduct(id) {
return document.getElementById('stock-' + id);
},
/**
* @param {Object} data Holds product id and maximum range for increasing button
*/
increaseStockQtyForProductUntilMaxRange(data) {
var stockCount = this.stockCountOfProduct(data.id);
if (! this.remainingMaxRequestForProductStockQty.hasOwnProperty(data.id)){
this.remainingMaxRequestForProductStockQty[data.id] = data.max;
}
if (stockCount.innerHTML < this.remainingMaxRequestForProductStockQty[data.id]) {
stockCount.innerHTML = parseInt(stockCount.innerHTML) + 1;
}
return this;
},
/**
* @param {Integer} id Holds div id data
*/
decreaseForProduct(id) {
var stockCount = this.stockCountOfProduct(id);
if (stockCount.innerHTML > 1) {
stockCount.innerHTML = parseInt(stockCount.innerHTML) - 1;
}
},
/**
* @param {Integer} id Holds div id data
*/
setRequestedStockCountForProduct(id) {
var stockCount = this.stockCountOfProduct(id);
if (! this.requestedStockQtyForProduct.hasOwnProperty(id)){
this.requestedStockQtyForProduct[id] = [];
}
this.requestedStockQtyForProduct[id] = parseInt(stockCount.innerHTML);
window.localStorage.setItem(id, this.requestedStockQtyForProduct[id]);
return this;
},
/**
* @param {Integer} id Holds div id data
*/
getRequestedStockCountForProduct(id) {
return window.localStorage.getItem(id);
},
/**
* @param {Integer} id Holds div id data
*/
setNewMaxIncrementForProduct(id) {
if (! this.remainingMaxRequestForProductStockQty.hasOwnProperty(id)){
this.remainingMaxRequestForProductStockQty[id] = [];
}
var totalRequested = this.getRequestedStockCountForProduct(id);
this.remainingMaxRequestForProductStockQty[id] -= totalRequested;
alert(this.remainingMaxRequestForProductStockQty[id]);
return this;
},
/**
* @param {Integer} id Holds div id data
*/
resetCounterForProduct(id) {
var elem = document.getElementById('stock-' + id);
if (this.remainingMaxRequestForProductStockQty[id] == 0) {
elem.innerHTML = 0;
} else {
elem.innerHTML = 1;
}
return this;
},
/**
* @param {Integer} id Holds div id data
*/
addProductRequestToBasket(id) {
// AJAX stuff goes here
return this;
},
};
basket = new Basket();
这是当前代码的 JsFiddle 链接:
https://jsfiddle.net/bgul/85k4ovxm/295/
我期望每个产品都有不同的总和输出,但我得到了我执行的所有产品库存请求的总和。
最佳答案
可以使用产品 ID 作为键将总计存储在对象中。这样总数就不会混淆。查看下面更新的示例:
function Basket() {
this.requestedStockQtyByProduct = {};
}
Basket.prototype = {
incrementForProductId(id) {
var elem = document.getElementById('stock-' + id);
elem.innerHTML = parseInt(elem.innerHTML) + 1;
if(!this.requestedStockQtyByProduct.hasOwnProperty(id)){
this.requestedStockQtyByProduct[id] = [];
}
this.requestedStockQtyByProduct[id].push(parseInt(elem.innerHTML));
var result = this.requestedStockQtyByProduct[id].reduce(function (prevItem, currentItem) {
return prevItem + currentItem;
}, 0)
window.localStorage.setItem(id, result);
},
cleanTotalStockQtyForThisProduct(id) {
window.localStorage.remove(id);
var elem = document.getElementById('stock-' + id);
elem.innerHTML = 0;
},
getTotalStockRequestForId(id) {
alert(window.localStorage.getItem(id));
},
};
basket = new Basket();
查看 jsfiddle:https://jsfiddle.net/maartendev/zbp3sg67/4/
关于javascript - 每个产品的每次点击次数总和,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/57741161/