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<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="style.css" type="text/css"/>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script src="js/libs/knockout-2.2.1/knockout-min.js"></script>
<script>
function init() {
// Class to represent a row in the seat reservations grid
function SeatReservation(name, initialMeal) {
var self = this;
self.name = name;
self.meal = ko.observable(initialMeal);
self.formattedPrice = ko.computed(function() {
var price = self.meal().price;
return price ? "$" + price.toFixed(2) : "None";
});
}
// Overall viewmodel for this screen, along with initial state
function ReservationsViewModel() {
var self = this;
// Non-editable catalog data - would come from the server
self.availableMeals = [
{mealName: "Standard (sandwich)", price: 0},
{mealName: "Premium (lobster)", price: 34.95},
{mealName: "Ultimate (whole zebra)", price: 290}
];
// Editable data
self.seats = ko.observableArray([
new SeatReservation("Steve", self.availableMeals[0]),
new SeatReservation("Bert", self.availableMeals[0])
]);
// Operations
self.addSeat = function() {
self.seats.push(new SeatReservation("", self.availableMeals[0]));
}
self.removeSeat = function(seat) {
self.seats.remove(seat)
}
self.totalSurcharge = ko.computed(function() {
var total = 0;
for (var i = 0; i < self.seats().length; i++)
total += self.seats()[i].meal().price;
return total;
});
}
ko.applyBindings(new ReservationsViewModel());
}
</script>
</head>
<body onload="init();">
<h2>Your seat reservations</h2>
<table>
<thead>
<tr>
<th>Passenger name</th><th>Meal</th><th>Surcharge</th><th></th>
</tr>
</thead>
<tbody data-bind="foreach: seats">
<tr>
<td><input data-bind="value: name" /></td>
<td><select data-bind="options: $root.availableMeals, value: meal, optionsText: 'mealName'"></select></td>
<td data-bind="text: formattedPrice"></td>
<td><a href="#" data-bind="click: $root.removeSeat">Remove</a></td>
</tr>
</tbody>
</table>
<button data-bind="click: addSeat, enable: seats().length < 5">Reserve another seat</button>
<h2>Your seat reservations (<span data-bind="text: seats().length"></span>)</h2>
<h3 data-bind="visible: totalSurcharge() > 0">
Total surcharge: $<span data-bind="text: totalSurcharge().toFixed(2)"></span>
</h3>
</body>
</html>
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