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我在淘汰赛中选择标签上的值绑定存在一些问题。

我有以下标记：

<select id="faultCode" data-bind="options: FaultCodes, optionsText: 'Description', value: FaultCode, optionsCaption: 'Choose a Fault Code'"></select>
<select id="causeCode" data-bind="options: CauseCodes, optionsText: 'Description', value: CauseCode, optionsCaption: 'Choose a Cause Code'"></select>
<select id="serviceAction" data-bind="options: ActionCodes, value: ActionCode, optionsText: 'Description', optionsCaption: 'Choose an Action Code'"></select>
<select id="plantClass" data-bind="options: PlantClasses, value: PlantClass, optionsText: 'Description', optionsCaption: 'Choose a Plant Class'"></select>
<select id="plantItem" data-bind="options: PlantItems, value: PlantItem, optionsText: 'Description', optionsCaption: 'Choose a Plant Item'"></select>

还有我的 Javascript：

self.FaultCode = ko.observable();
self.ActionCode = ko.observable();
self.PlantClass = ko.observable();
self.PlantItem = ko.observable();
self.CauseCode = ko.observable();

self.FaultCodes = ko.observableArray();
self.ActionCodes = ko.observableArray();
self.PlantClasses = ko.observableArray();
self.PlantItems = ko.observableArray();
self.CauseCodes = ko.observableArray();

self.closeRequest = function () {
    var fault = "";
    var action = "";
    var cause = "";
    var pc = "";
    var pi = "";
    if (self.FaultCode() != undefined) {
        fault = self.FaultCode();
    }
    if (self.ActionCode() != undefined) {
        action = self.ActionCode();
    }
    if (self.CauseCode() != undefined) {
        cause = self.CauseCode();
    }
    if (self.PlantClass() != undefined) {
        pc = self.PlantClass();
    }
    if (self.PlantItem() != undefined) {
        pi = self.PlantItem();
    }
}

如果用户从所有 5 个选择框中选择一个选项并触发 closeRequest 函数，则 FaultCode observable 的值为 ""（空字符串）， CauseCode observable 的值为 undefined。其他三个值 observables 都具有正确的对象作为它们的值。

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1 回答 1

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当您输入 closeRequest 或其他什么时，您确定您的 FaultCode 有一个值吗？ 

 console.log(self.FaultCode());

当您第一次进入该功能时。另外，您是说(self.FaultCode() != undefined)这是一个松散的比较并且不是很好。如果您从上面的 console.log 语句中获取记录的值，这应该会为您修复它 -

self.closeRequest = function () {
    console.log(self.FaultCode());
    var fault = "";
    var action = "";
    var cause = "";
    var pc = "";
    var pi = "";
    if (self.FaultCode()) {
        fault = self.FaultCode();
    }
    if (self.ActionCode()) {
        action = self.ActionCode();
    }
    if (self.CauseCode()) {
        cause = self.CauseCode();
    }
    if (self.PlantClass()) {
        pc = self.PlantClass();
    }
    if (self.PlantItem()) {
        pi = self.PlantItem();
    }
}

只要 observables 不是false, undefined, ""，否则null它将设置 fault 等于 observable 。

当您使用双等号时，您是在松散地比较值，也可以使用三等号进行类型比较。

于 2013-10-07T22:04:58.527 回答