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我正在按照 John Papa 的 Jumpstart 中提供的指导构建一个 SPA。当我创建模型时，它有

modelObservable().entityAspect.entityState.isAdded() = true;

我更新了文本、下拉列表和 modelObservable().entityAspect.entityState.isAdded() = false;

在我的数据上下文中：

  var createProject = function (position) {
            return manager.createEntity(entityNames.project,
                {
                    positionId : position.id(),
                    start : position.start(),
                    memberId : position.memberId()
                });
        };

从我的添加视图模型中调用：

   define(['services/datacontext', 'durandal/plugins/router', 'durandal/system', 'durandal/app', 'services/logger', 'services/uiService'],
    function (datacontext, router, system, app, logger, ui) {
        var model = ko.observable();
        var position = ko.observable();
        var hourTypes = ko.observableArray([]);
        var isSaving = ko.observable(false);
        // init
        var activate = function (routeData) {
            logger.log('Add View Activated', null, 'add', true);
            var positionId = parseInt(routeData.id);

            initLookups();
            return datacontext.getPositionById(positionId, position).then(**createProject**);
        };

        var initLookups = function () {
            logger.log('initLookups', null, 'add', true);
            hourTypes(datacontext.lookups.hourTypes);
        };

        // state

        **var createProject = function () {
            return model(datacontext.createProject(position()));
        }**

        var addNewProject = function () {
            if (position == undefined || position().id() < 1) {
                console.log('callback addNewProject');
                setTimeout(function () {
                    addNewProject();
                }, 1000);
            } else {
                datacontext.addProject(position(), model);
                console.log(model().id());
                return;
            }
        }

        var **save** = function () {
            isSaving(true);
            **datacontext.saveChanges()**
                    .then(goToEditView).fin(complete);

            function complete() {
                isSaving(false);
            }
            function goToEditView() {
                isSaving(false);
                var url = '#/Projects/';
                router.navigateTo(url + model().id());
            }
        };

        var vm = {
            activate: activate,
            hourTypes: hourTypes,
            isAdded: isAdded,
            model: model,
            save: save,
            title: 'Details View'
        };

        return vm;

});

html

<section  data-bind="with:model">
     <h1 data-bind="text: name"> <i class="icon-asterisk" data-bind="visible: hasChanges" style="font-size: 30px;"></i></h1>
        <div class="errorPanel"></div>
        <div id="overview" class="project" >
            <div class="row">
                <div class="span4">
                    <label class="requiredLabel">Name*</label>
                    <input type="text" name="name" data-bind="value: name" style="width: 27em;" class="required" placeholder="Project Name" required validationMessage="Project Name required" /><span class="k-invalid-msg" data-for="title"></span>
                </div>
            </div>
            <div class="row">
                <div class="span3"><label class="requiredLabel">Start*</label></div>
                <div class="span3"><label class="requiredLabel">End</label></div>
            </div>
            <div class="row">
                <div class="span3"><input name="start" data-bind="shortDate: start" class="date required" required="required" placeholder="mm/dd/yyyy" style=" width:142px"></div>
                <div class="span3"><input name="end"   data-bind="shortDate: end"  class="date" placeholder="mm/dd/yyyy"  style=" width:142px"><span class="k-invalid-msg" data-for="end"></span></div>
            </div>
            <br/>
            <div class="row">
                <div class="span3"><label for="hourType" class="requiredLabel">Measure As*</label></div>
                <div class="span2"><label for="hoursPerWeek" class="requiredLabel">Hours/Week</label></div>
                <div class="span2"><label for="totalHours" class="requiredLabel">Total Hours</label></div>
            </div>   
            <div class="row">
                <div class="span3">
                    <select id="hourType" data-bind="options: $parent.hourTypes, optionsText: 'name', value: hourType" required validationMessage="Measure As required"></select><span class="k-invalid-msg" data-for="hourType"></span>
                </div>
                <div class="span2">
                    <input name="hoursPerWeek" type="number" min="1" max="120" required="required" data-bind="value: hoursPerWeek,  validationOptions: { errorElementClass: 'input-validation-error' }, enable: hourType().id() == 1" class="hours required"" style="width: 80px;"  validationMessage="Hours required"><span class="k-invalid-msg" data-for="projectHours"></span>
                    <span class="k-invalid-msg" data-for="totalHours"></span>
                </div>
                <div class="span2">
                    <input name="totalHours" type="number"  min="40" max="2080" required="required" data-bind="value: totalHours,  validationOptions: { errorElementClass: 'input-validation-error' }, enable: hourType().id() == 2" class="hours required"" style="width: 80px;"  validationMessage="Hours required"><span class="k-invalid-msg" data-for="projectHours"></span>
                    <span class="k-invalid-msg" data-for="totalHours"></span>
                </div>
            </div>
            <div class="row">
                <div class="span4">
                    <label class="requiredLabel">Description*</label><span class="k-invalid-msg" data-for="description"></span><span id="posMinDesc" style="visibility:hidden"></span>
                    <textarea id="description" name="description" style="height: 200px; width: 650px;" data-bind="value: description, enabled:true, click: $parent.clearDefaults" rows="4" cols="60" class="richTextEditor k-textbox" required validationMessage="Description required" ></textarea>
                </div>
            </div>    
        </div>
    <div class="button-bar">
        <button class="btn btn-info"  data-bind="click:  $parent.goBack"><i class="icon-hand-left"></i> Back</button>
        <button class="btn btn-info"  data-bind="click:  $parent.save, enable:  $parent.canSave"><i class="icon-save"></i> Save</button>
    </div>
</section>

json 微风发送到我的控制器是这样的：

{ "entities": [ { "Id": -1, "Description": "poi", "End": null, "Gauge": 0, "Score": 0, "HourTypeId": 1, "HoursPerWeek": 45，“HourlyRate”：null，“TotalHours”：null，“WeightedHours”：0，“CreditMinutes”：0，“TotalCompensation”：null，“IsCurrent”：false，“Name”：“poi”，“PositionId”： 1、“MemberId”：1、“开始”：“2011-09-01T00:00:00Z”、“未定义”：false、“entityAspect”：{“entityTypeName”：“项目：#SkillTraxx.Model”、“defaultResourceName": "Projects", "entityState": "已修改", "originalValuesMap": { "Name": "", "HourTypeId": 0, "HoursPerWeek": null, "Description": "" }, "autoGeneratedKey": { "propertyName": "Id", "autoGeneratedKeyType" : "身份" } } } ], "saveOptions": {} }

如您所见，上述不正确的 b/c 状态为“已修改”且 Id = -1。这会引发服务器端错误。我想我可以捕获 DbUpdateConcurrencyException，展开 JObject 并将“Modified”更改为添加，但它到处都是代码气味。

如果有人能帮我在这一切中找到面对面的时刻，我已经准备好了。感谢您的关注！

4

1 回答 1

1

面对它，我接受了 Jays 的建议并开始剥离 html，然后我意识到这是我的处理程序。shortDate 处理程序上的更新方法负责。我将它包装在一个 if 语句中，如果添加了当前状态，则不发送更新。

ko.bindingHandlers.shortDate = {
    init: function (element, valueAccessor) {
        //attach an event handler to our dom element to handle user input
        element.onchange = function () {
            var value = valueAccessor();//get our observable
            //set our observable to the parsed date from the input
            value(moment(element.value).toDate());
        };
    },
    update: function (element, valueAccessor, allBindingsAccessor, viewModel) {
        var value = valueAccessor();
        var valueUnwrapped = ko.utils.unwrapObservable(value);
        if (valueUnwrapped) {
            element.value = moment(valueUnwrapped).format('L');
            if (!viewModel.entityAspect.entityState.isAdded())
            {
                **viewModel.entityAspect.setModified();**
            }
        }
    }
};
于 2013-06-18T04:28:46.350 回答