敲除MVC3:Knockout Model不会发布收集数据?

时间:2012-03-23 15:27:44

标签: javascript asp.net-mvc json asp.net-mvc-3 knockout.js

解答: 替换这一行:

self.identifiers.push(new Identifier(self.identifierToAdd(), self.selectedIdentifierTypeValue()));

这一行:

self.identifiers.push({ Key: self.identifierToAdd(), Value: self.selectedIdentifierTypeValue()});

发布请求现在正确发送集合数据。然而,这并没有解决MVC行动没有收到它的事实,但这个问题已经足够大了。


在发布到动作时,我似乎无法将我的模型的集合属性中的数据从敲除中获取到我的MVC模型中。如果我从下面提醒ko.toJSON我的identifiers()属性,它会正确显示所有数据,但是当我尝试通过正常回发提交该数据时(该操作只需要下面的EquipmentCreateModel),它看起来像这样:

state of model upon submit

标识符为空,当我查看标识符的ModelState错误时,它表示cannot convert String to Dictionary<Guid, string>。我究竟做错了什么?我认为MVC3会自动将JSON转换为对象(如果可以的话),就像BuildingCodeRoom属性一样吗?

为什么我上面图片中的字符串数据已经转义了引号?


编辑: 如果我查看帖子数据,标识符将显示为空数组(identifiers: [{}])。我在save方法中尝试了jsoning标识符,如下所示:

self.identifiers = ko.toJSON(self.identifiers());

这会导致请求数据不为空,如下所示:

identifiers:"[{\"Value\":\"sdfsd\",\"Key\":\"4554f477-5a58-4e81-a6b9-7fc24d081def\"}]"

但是,调试操作时会出现同样的问题。我也试过jsoning整个模型(如knockoutjs submit with ko.utils.postJson issue中所述):

ko.utils.postJson($("form")[0], ko.toJSON(self));

但这会产生一个.NET错误,上面写着Operation is not valid due to the current state of the object.从查看请求数据看起来它是JSON-ified两次,因为每个字母或字符都是它在HttpCollection中的值,这是因为。 NET默认情况下仅允许最大1000('Operation is not valid due to the current state of the object' error during postback)。

使用$ .ajax方法提交数据,一切正常:

 $.ajax({
            url: location.href, 
            type: "POST",
            data: ko.toJSON(viewModel),
            datatype: "json",
            contentType: "application/json charset=utf-8",
            success: function (data) { alert("success"); }, 
            error: function (data) { alert("error"); }
        });

但是由于其他原因我不能使用$ .ajax方法,所以我需要它在正常的帖子中工作。为什么我可以toJSON ajax请求中的整个viewModel并且它可以工作,但是在正常的回发中它会将其拆分,而当我不这样做时,所有引号都会在发送的JSON中转义。


这是我的ViewModel:

public class EquipmentCreateModel
{
//used to populate form drop downs
public ICollection<Building> Buildings { get; set; }
public ICollection<IdentifierType> IdentifierTypes { get; set; }

[Required]
[Display(Name = "Building")]
public string BuildingCode { get; set; }

[Required]
public string Room { get; set; }

[Required]
[Range(1, 100, ErrorMessage = "You must add at least one identifier.")]
public int IdentifiersCount { get; set; } //used as a hidden field to validate the list
public string IdentifierValue { get; set; } //used only for knockout viewmodel binding

public IDictionary<Guid, string> Identifiers { get; set; }
}

然后我的淘汰脚本/ ViewModel:

<script type="text/javascript">
// Class to represent an identifier
function Identifier(value, identifierType) {
    var self = this;
    self.Value = ko.observable(value);
    self.Key = ko.observable(identifierType);
}

// Overall viewmodel for this screen, along with initial state
function AutoclaveCreateViewModel() {
    var self = this;

    //MVC properties
    self.BuildingCode = ko.observable();
    self.room = ko.observable("55");
    self.identifiers = ko.observableArray();
    self.identiferTypes = @Html.Raw(Json.Encode(Model.IdentifierTypes));
    self.identifiersCount = ko.observable();


    //ko-only properties
    self.selectedIdentifierTypeValue = ko.observable();
    self.identifierToAdd = ko.observable("");

    //functionality
    self.addIdentifier = function() {
        if ((self.identifierToAdd() != "") && (self.identifiers.indexOf(self.identifierToAdd()) < 0)) // Prevent blanks and duplicates
        {
            self.identifiers.push(new Identifier(self.identifierToAdd(), self.selectedIdentifierTypeValue()));
            alert(ko.toJSON(self.identifiers()));
        }
        self.identifierToAdd(""); // Clear the text box
    };

    self.removeIdentifier = function (identifier) {
        self.identifiers.remove(identifier);
        alert(JSON.stringify(self.identifiers()));
    };

    self.save = function(form) {
        self.identifiersCount = self.identifiers().length;
        ko.utils.postJson($("form")[0], self);
    };
}
    var viewModel = new EquipmentCreateViewModel();
    ko.applyBindings(viewModel);
    $.validator.unobtrusive.parse("#equipmentCreation");      
    $("#equipmentCreation").data("validator").settings.submitHandler = viewModel.save;

查看:

@using (Html.BeginForm("Create", "Equipment", FormMethod.Post, new { id="equipmentCreation"}))
{
@Html.ValidationSummary(true)
<fieldset>
    <legend>Location</legend>
    <div class="editor-label">
        @Html.LabelFor(model => model.BuildingCode)
    </div>
    <div class="editor-field">
        @Html.DropDownListFor(model => model.BuildingCode, new SelectList(Model.Buildings, "BuildingCode", "BuildingName", "1091"), "-- Select a Building --", new { data_bind = "value:BuildingCode"})
        @Html.ValidationMessageFor(model => model.BuildingCode)
    </div>
    <div class="editor-label">
        @Html.LabelFor(model => model.Room)
    </div>
    <div class="editor-field">
        @Html.TextBoxFor(model => model.Room, new { @class = "inline width-7", data_bind="value:room"})
        @Html.ValidationMessageFor(model => model.Room)
    </div>
</fieldset>
<fieldset>
    <legend>Identifiers</legend>
    <p>Designate any unique properties for identifying this autoclave.</p>
    <div class="editor-field">
        Add Identifier
        @Html.DropDownList("identifiers-drop-down", new SelectList(Model.IdentifierTypes, "Id", "Name"), new { data_bind = "value:selectedIdentifierTypeValue"})
        @Html.TextBox("identifier-value", null, new { @class = "inline width-15", data_bind = "value:identifierToAdd, valueUpdate: 'afterkeydown'" })
        <button type="submit" class="add-button" data-bind="enable: identifierToAdd().length > 0, click: addIdentifier">Add</button>
    </div>

    <div class="editor-field">
        <table>
            <thead>
                <tr>
                    <th>Identifier Type</th>
                    <th>Value</th>
                    <th></th>
                </tr>
            </thead>
            <!-- ko if: identifiers().length > 0 -->
            <tbody data-bind="foreach: identifiers">

                <tr>
                    <td>
                        <select data-bind="options: $root.identiferTypes, 
                        optionsText: 'Name', optionsValue: 'Id', value: Key">
                        </select>
                    </td>
                    <td><input type="text" data-bind="value: Value"/></td>
                    <td><a href="#" class="ui-icon ui-icon-closethick" data-bind="click: $root.removeIdentifier">Remove</a></td>
                </tr>


            </tbody>
            <!-- /ko -->
            <!-- ko if: identifiers().length < 1 -->
            <tbody>
                <tr>    
                    <td colspan="3"> No identifiers added.</td>
                </tr>
            </tbody>
            <!-- /ko -->
        </table>
        @Html.HiddenFor(x => x.IdentifiersCount, new { data_bind = "value:identifiers().length" })<span data-bind="text:identifiers"></span>
        @Html.ValidationMessageFor(x => x.IdentifiersCount)
    </div>    
</fieldset>
<p>
    <input type="submit" value="Create" />
</p>
}

1 个答案:

答案 0 :(得分:1)

我想我已经找到了问题或者至少缩小了问题的范围。可编辑的网格示例使用简单的js对象来表示礼物。您正在使用带有子可观察对象的Identifier对象。似乎如果我们更新网格示例以使用更复杂的类型,它也会以与示例相同的方式中断。这可能是设计或错误。

http://jsfiddle.net/SZzVW/9/

我认为唯一的解决方案是编写自己的映射函数来提交表单。

希望这有帮助。

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