KnockOutJs 对象不更新 UI

发布于 2024-12-15 10:13:30 字数 4391 浏览 1 评论 0原文

我正在尝试使用 Ajax 调用更新 KnockOutJS 页面。 Update 函数应从 Web 服务检索 Gifts Observable 数组。这不应该更新模型，然后更新用户界面吗？我一定想念这是如何工作的。我的想法？

谢谢

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <tit
le>Index</title>
    <link rel="Stylesheet" href="/Content/Site.css" />
    <script type="text/javascript" src="/Scripts/jquery-1.4.2.js"></script>
    <script type="text/javascript" src="/Scripts/jquery.validate.js"></script>
    <script type="text/javascript" src="/Scripts/jquery.tmpl.js"></script>

    <script type="text/javascript" src="/Scripts/knockout-1.2.1.js"></script>
    <script type="text/javascript" src="/Scripts/knockout.mapping.js"></script>
    <script type="text/javascript" src="/Scripts/json2.js"></script>
    <script type="text/javascript" src="http://knockoutjs.com/examples/resources/sampleProductCategories.js">
</script>
</head>
<body>
    <div>
    <h1>Gift list editor 2</h1>
    11/15/2011 12:55:32 PM <br />

    <p>You have asked for <span data-bind="text: gifts().length">&nbsp;</span> gift(s)</p>

    <form class="giftListEditor" action="" >
        <table style="width: 800px;"> 
            <tbody data-bind="template: { name: 'giftRowTemplate', foreach: gifts }"></tbody> 
        </table>


        <button data-bind="click: addGift">Add Gift</button>
        <button data-bind="enable: gifts().length > 0" type="submit">Submit</button>
        <button data-bind="click: update, enable: gifts().length > 0">Partial Update</button>

    </form>

    <script type="text/html" id="giftRowTemplate"> 
        <tr> 
            <td style="width:100px;" >
                <label data-bind="visible: GiftId == 0">New</label>
                <label data-bind="text: 'GiftId: ' + GiftId, visible: GiftId > 0" />
            </td> 
            <td><select data-bind='options: sampleProductCategories, optionsText: "name"' /></td>
            <td>Gift name: <input class="required" data-bind="value: Title, uniqueName: true"/></td> 
            <td>Price: $ <input class="required number" data-bind="value: Price, uniqueName: true" /></td> 
            <td><a href="#" data-bind="click: function() { viewModel.removeGift($data) }">Delete</a></td> 
        </tr>
    </script>

    <script type="text/javascript">

        var initialData =  [{"GiftId":13,"Title":"test","Price":3},{"GiftId":15,"Title":"asdasd","Price":444},{"GiftId":44,"Title":"asd","Price":1},{"GiftId":45,"Title":"asdasd","Price":1231},{"GiftId":46,"Title":"qwe","Price":132},{"GiftId":47,"Title":"eeee","Price":123123},{"GiftId":48,"Title":"www","Price":121212}];    //var initialData = [{ GiftId: "","Title": "Tall Hat", "Price": 49.95 }, { GiftId: "","Title": "Long Cloak", "Price": 78.25}];

        var viewModel = {

            gifts: ko.observableArray(initialData),

            addGift: function () { 
                this.gifts.push({ GiftId: "0", Title: "", Price: "" }); 
            },

            removeGift: function (gift) { 
                this.gifts.remove(gift); 
            },

            update: function () { 
                 $.ajax({
                    url: "/Home/PartialUpdate", 

                    success: function(result){
                        this.gifts =  ko.utils.parseJson(result); //[{ GiftId: "33", Title: "ThirtyThree", Price: "10.50" }] 
                        alert(this.gifts.length);
                    },
                    error:function(xhr,err){ 
                        alert("readyState: " + xhr.readyState+"\nstatus: "+xhr.status); 
                        alert("responseText: " + xhr.responseText);
                    }
                 });
            },

            save: function() { 
                ko.utils.postJson(location.href, { gifts: this.gifts }); 
            } 
        };

        ko.applyBindings(viewModel, document.body);

        $("form").validate({ submitHandler: function() { viewModel.save() } });

    </script>


    </div>
</body>
</html>

原文

I am trying to update a KnockOutJS page using an Ajax call. The Update function should retrieve the Gifts Observable array from a web service. Shouldn't this update the model, then the UI. I must be missing how this works. I ideas?

Thanks

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <tit
le>Index</title>
    <link rel="Stylesheet" href="/Content/Site.css" />
    <script type="text/javascript" src="/Scripts/jquery-1.4.2.js"></script>
    <script type="text/javascript" src="/Scripts/jquery.validate.js"></script>
    <script type="text/javascript" src="/Scripts/jquery.tmpl.js"></script>

    <script type="text/javascript" src="/Scripts/knockout-1.2.1.js"></script>
    <script type="text/javascript" src="/Scripts/knockout.mapping.js"></script>
    <script type="text/javascript" src="/Scripts/json2.js"></script>
    <script type="text/javascript" src="http://knockoutjs.com/examples/resources/sampleProductCategories.js">
</script>
</head>
<body>
    <div>
    <h1>Gift list editor 2</h1>
    11/15/2011 12:55:32 PM <br />

    <p>You have asked for <span data-bind="text: gifts().length"> </span> gift(s)</p>

    <form class="giftListEditor" action="" >
        <table style="width: 800px;"> 
            <tbody data-bind="template: { name: 'giftRowTemplate', foreach: gifts }"></tbody> 
        </table>


        <button data-bind="click: addGift">Add Gift</button>
        <button data-bind="enable: gifts().length > 0" type="submit">Submit</button>
        <button data-bind="click: update, enable: gifts().length > 0">Partial Update</button>

    </form>

    <script type="text/html" id="giftRowTemplate"> 
        <tr> 
            <td style="width:100px;" >
                <label data-bind="visible: GiftId == 0">New</label>
                <label data-bind="text: 'GiftId: ' + GiftId, visible: GiftId > 0" />
            </td> 
            <td><select data-bind='options: sampleProductCategories, optionsText: "name"' /></td>
            <td>Gift name: <input class="required" data-bind="value: Title, uniqueName: true"/></td> 
            <td>Price: $ <input class="required number" data-bind="value: Price, uniqueName: true" /></td> 
            <td><a href="#" data-bind="click: function() { viewModel.removeGift($data) }">Delete</a></td> 
        </tr>
    </script>

    <script type="text/javascript">

        var initialData =  [{"GiftId":13,"Title":"test","Price":3},{"GiftId":15,"Title":"asdasd","Price":444},{"GiftId":44,"Title":"asd","Price":1},{"GiftId":45,"Title":"asdasd","Price":1231},{"GiftId":46,"Title":"qwe","Price":132},{"GiftId":47,"Title":"eeee","Price":123123},{"GiftId":48,"Title":"www","Price":121212}];    //var initialData = [{ GiftId: "","Title": "Tall Hat", "Price": 49.95 }, { GiftId: "","Title": "Long Cloak", "Price": 78.25}];

        var viewModel = {

            gifts: ko.observableArray(initialData),

            addGift: function () { 
                this.gifts.push({ GiftId: "0", Title: "", Price: "" }); 
            },

            removeGift: function (gift) { 
                this.gifts.remove(gift); 
            },

            update: function () { 
                 $.ajax({
                    url: "/Home/PartialUpdate", 

                    success: function(result){
                        this.gifts =  ko.utils.parseJson(result); //[{ GiftId: "33", Title: "ThirtyThree", Price: "10.50" }] 
                        alert(this.gifts.length);
                    },
                    error:function(xhr,err){ 
                        alert("readyState: " + xhr.readyState+"\nstatus: "+xhr.status); 
                        alert("responseText: " + xhr.responseText);
                    }
                 });
            },

            save: function() { 
                ko.utils.postJson(location.href, { gifts: this.gifts }); 
            } 
        };

        ko.applyBindings(viewModel, document.body);

        $("form").validate({ submitHandler: function() { viewModel.save() } });

    </script>


    </div>
</body>
</html>

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空名 2024-12-22 10:13:30

this.gifts 是一个 observableArray。当您设置更新的值时，您需要将其设置为可观察的：

this.gifts(ko.utils.parseJson(result));

您当前的代码正在将gift设置为等于不可观察或当前绑定到UI的新数组。

您可能还需要小心成功函数中的 this。如果 this 不合适，那么您可以选择将 context: viewModel 添加到 $.ajax 选项中。

this.gifts is an observableArray. When you set the updated value, you need to set it as an observable:

this.gifts(ko.utils.parseJson(result));

The current code that you have is setting gifts equal to a new array that is not observable or currently bound against the UI.

You may also need to be careful with this in your success function. If this is not appropriate, then you could choose to add a context: viewModel to your $.ajax options.

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