39 lines
1.1 KiB
JavaScript
39 lines
1.1 KiB
JavaScript
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var CartProduct = function (product, units) {
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"unit strict";
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// Each cart product is composed of the product and units of the product we want to buy
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var _product = product,
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_units = ko.observable(units); // number of units to add or remove
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var subtotal = ko.computed(function() {
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return _product.price() * _units();
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});
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var addUnit = function () {
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var u = _units(); // read number of units from observable
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var _stock = product.stock();
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if (_stock === 0 ) {
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return;
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}
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_units(u + 1); // assign observable with new unit
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_product.stock(--_stock); // reduce inventory of stock by decrease unit from product
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};
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var removeUnit = function () {
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var u = _units();
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var _stock = _product.stock();
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if (u === 0) {
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return;
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}
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_units(u - 1);
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_product.stock(++_stock);
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};
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return {
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product: _product,
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units: _units,
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subtotal: subtotal,
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addUnit: addUnit,
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removeUnit: removeUnit
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}
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}
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