湯姆大叔的博客

var viewModel = {
    stringValue: ko.observable("Hello"),
    passwordValue: ko.observable("mypass"),
    booleanValue: ko.observable(true),
    optionValues: ["Alpha", "Beta", "Gamma"],
    selectedOptionValue: ko.observable("Gamma"),
    multipleSelectedOptionValues: ko.observable(["Alpha"]),
    radioSelectedOptionValue: ko.observable("Beta")
};

ko.applyBindings(viewModel);

<div data-bind='template: "peopleTemplate"'>
</div>
<label>
    <input type="checkbox" data-bind="checked: showRenderTimes"/>
    Show render times</label>
<script type="text/html" id="peopleTemplate">
<h2>People</h2>
<ul>
  {{each people}}
  <li>
  <div>
    ${ name } has <span data-bind="text: children().length">&nbsp;</span> children:
    <a href="#" data-bind="click: addChild ">Add child</a>
    <span class="renderTime" data-bind="visible: showRenderTimes">
                        (person rendered at <span data-bind="text: new Date().getSeconds()"></span>)
    </span>
  </div>
  <div data-bind='template: { name: "childrenTemplate", data: children }'></div>
  </li>
{{/each}}
</ul>
</script>
<script type="text/html" id="childrenTemplate">
    <ul>
        {{each $data}}
            <li>
                ${ this }
                <span class="renderTime" data-bind="visible: viewModel.showRenderTimes">
                    (child rendered at <span data-bind="text: new Date().getSeconds()"></span>)
               </span>
           </li>
        {{/each}}
</ul>
</script>

// Define a "person" class that tracks its own name and children, and has a method to add a new child

var person = function (name, children) {
    this.name = name;
    this.children = ko.observableArray(children); 

    this.addChild = function () {
        this.children.push("New child");
    } .bind(this);
}

// The view model is an abstract description of the state of the UI, but without any knowledge of the UI technology (HTML)

var viewModel = {
    people: [
        new person("Annabelle", ["Arnie", "Anders", "Apple"]),
        new person("Bertie", ["Boutros-Boutros", "Brianna", "Barbie", "Bee-bop"]),
        new person("Charles", ["Cayenne", "Cleopatra"])
    ],
    showRenderTimes: ko.observable(false)
}; 

ko.applyBindings(viewModel);

<div data-bind="simpleGrid: gridViewModel"> </div>

<button data-bind='click: function() { items.push({ name: "New item", sales: 0, price: 100 }) }'>
    Add item  
</button>

<button data-bind="click: sortByName">
    Sort by name
</button>

<button data-bind="click: function() { gridViewModel.currentPageIndex(0) }">
    Jump to first page
</button>

var myModel = {
    items: ko.observableArray([
        { name: "Well-Travelled Kitten", sales: 352, price: 75.95 },
        { name: "Speedy Coyote", sales: 89, price: 190.00 },
        { name: "Furious Lizard", sales: 152, price: 25.00 },
        { name: "Indifferent Monkey", sales: 1, price: 99.95 },
        { name: "Brooding Dragon", sales: 0, price: 6350 },
        { name: "Ingenious Tadpole", sales: 39450, price: 0.35 },
        { name: "Optimistic Snail", sales: 420, price: 1.50 }
    ]),

    sortByName: function () {
        this.items.sort(function (a, b) {
            return a.name < b.name ? -1 : 1;
        });
    }
};

myModel.gridViewModel = new ko.simpleGrid.viewModel({
    data: myModel.items,
    columns: [
        { headerText: "Item Name", rowText: "name" },
        { headerText: "Sales Count", rowText: "sales" },
        { headerText: "Price", rowText: function (item) { return "$" + item.price.toFixed(2) } }
    ],
    pageSize: 4
});

ko.applyBindings(myModel);

<h2>Planets</h2>
<p>
    <label>
        <input type="checkbox" data-bind="checked: displayAdvancedOptions"/>
        Display advanced options
    </label>
</p>
<p data-bind="fadeVisible: displayAdvancedOptions">
    Show:
    <label><input type="radio" value="all" data-bind="checked: typeToShow"/>All</label>
    <label><input type="radio" value="rock" data-bind="checked: typeToShow"/>Rocky planets</label>
    <label><input type="radio" value="gasgiant" data-bind="checked: typeToShow"/>Gas giants</label>
</p>
<div data-bind='template: { name: "planetsTemplate",
                            foreach: planetsToShow,
                            beforeRemove: function(elem) { $(elem).slideUp(function() { $(elem).remove(); }) },
                            afterAdd: function(elem) { $(elem).hide().slideDown() } }'>
</div>
<script type="text/html" id="planetsTemplate">
    <div class="planet ${ type }">${ name }</div>
</script>
<p data-bind="fadeVisible: displayAdvancedOptions">
    <button data-bind='click: function() { addPlanet("rock") }'>
        Add rocky planet</button>
    <button data-bind='click: function() { addPlanet("gasgiant") }'>
        Add gas giant</button>
</p>

var viewModel = {
    planets: ko.observableArray([
        { name: "Mercury", type: "rock" },
        { name: "Venus", type: "rock" },
        { name: "Earth", type: "rock" },
        { name: "Mars", type: "rock" },
        { name: "Jupiter", type: "gasgiant" },
        { name: "Saturn", type: "gasgiant" },
        { name: "Uranus", type: "gasgiant" },
        { name: "Neptune", type: "gasgiant" },
        { name: "Pluto", type: "rock" }
    ]),

    typeToShow: ko.observable("all"),
    displayAdvancedOptions: ko.observable(false),

    addPlanet: function (type) { this.planets.push({ name: "New planet", type: type }); }
};

viewModel.planetsToShow = ko.dependentObservable(function () {
    // Represents a filtered list of planets
    // i.e., only those matching the "typeToShow" condition

    var desiredType = this.typeToShow();

    if (desiredType == "all")
        return this.planets();

    return ko.utils.arrayFilter(this.planets(), function (planet) {
        return planet.type == desiredType;
    });
} .bind(viewModel));

// Here's a custom Knockout binding that makes elements shown/hidden via jQuery's fadeIn()/fadeOut() methods
// Could be stored in a separate utility library

ko.bindingHandlers.fadeVisible = {
    init: function (element, valueAccessor) {
        // Initially set the element to be instantly visible/hidden depending on the value
        var value = valueAccessor();

        $(element).toggle(ko.utils.unwrapObservable(value));
        // Use "unwrapObservable" so we can handle values that may or may not be observable
    },

    update: function (element, valueAccessor) {
        // Whenever the value subsequently changes, slowly fade the element in or out
        var value = valueAccessor();
        ko.utils.unwrapObservable(value) ? $(element).fadeIn() : $(element).fadeOut();
    }
};

ko.applyBindings(viewModel);