Canceled事件未将RadTextBox还原为初始值

"valueChanging": function(sender, e) {
    args = {};
    console.log(" [EventOccurring] - sender: %o - e: %o - args: %o", sender, e, args); 
    e._cancel = !(Paysheet.UI.WorkRate.OnValueChanging(sender, e, args));
}

工资单。XHR

 window.Paysheet.XHR = {
    "POST": function (uri, jsonData) {
        /// <summary>Encapsulates the XmlHttpRequest object; posts the given data (JSON string) to a specified handler page and returns the JSON object</summary>
        /// <param name="url" type="String">URI</param>
        /// <param name="jsonData" type="String">JSON Data to be posted</param>
        uri = uri || jsonData._uri;
        var xhr = new XMLHttpRequest();
        xhr.open("POST", uri, false); // synchronous call
        xhr.setRequestHeader('Content-Type', 'application/json');
        xhr.send(JSON.stringify(jsonData));
        return (xhr.status == 200) ? JSON.parse(xhr.response) : { "isValid": false, "StatusCode": 500 };
    }
};

工资单。Common

window.Paysheet.Common = {
    "Func": function (func, sender, e, args) {
        console.log("Call to func..");
        var result = func(sender, e, args, (Paysheet.XHR.POST(args._uri, args) || { "isValid": false, "isOverrideable" : false, "StatusCode": 500 }));
        console.log("result of call: %o", result);
        return result;
    },
    "GenericResultHandler": function (result, handlers) {
        result = result || { "isValid": false, "isOverrideable": false, "StatusCode": 500 };
        if (result.StatusCode != 200) {
            console.log("[ERROR] - [RadAlert] Invoked...");
            //the result.message show be more domain specific.
            radalert(result.message || "Internal Error Occurred!", 400, 350, result.title || "Alert - Error", null, null);
        } else if (result.isValid) {
            console.log("[APPROVED]");
            handlers.approve();
            return true;
        } else if (result.isOverrideable) {
            console.log("[OVERRIDE] - [RadPrompt] Invoked...");
            handlers.override();
        } else {
            console.log("[REJECTED] - [RadAlert] Invoked...");
            handlers.reject();
            //the result.message show be more domain specific.
            radalert(result.message || "The state of this data prevents any modifications; Overriding is not an option.",
                400, 350,
                result.title || "Alert - Denied",
                null, null);
        }
        // ultimately, the caller will be a cancelable telerik event.
        //    by convension, the result is inverted/flipped: thus, this resolves to 'e.set_cancel = !([return])'
        //    note: override will have to set the value explicitly without triggering this event in the (presumed) asynchronous method call to 'handlers.override';
        return false;
    },
    "GenericOverrideResultHandler": function (result, handlers) {
        result = result || { "isValid": false, "StatusCode": 500, "isOverrideable" : false };            
        if (result.StatusCode != 200) {
            console.log("[OVERRIDE ERROR] - [RadAlert] Invoked...");
            radalert(result.message || "Internal Error Occurred!", 400, 350, result.title || "Alert - Error", null, null);
        } else if (result.isValid) {
            console.log("[OVERRIDE APPROVED]");
            handlers.approve();
        } else {
            console.log("[OVERRIDE REJECTED] - [RadAlert] Invoked...");
            //the result.message show be more domain specific.
            radalert(result.message || "Override was denied, no modification made to stored data!", 400, 350, result.title || "Alert - Override Denied", null, null);
            handlers.reject();
        }
    },
    "OnValueChangingResultHandler": function (sender, e, args, result) {
        return Paysheet.Common.GenericResultHandler(result, { "approve": approve, "override": override, "reject": reject });
        function approve() {
            var d = Paysheet.Common.GetDataKeyValues(sender);
            var DaysCell = sender.get_parent().get_cell("Days");
            if (DaysCell["set_value"]) {
                DaysCell.set_value(result.content.Days);
            } else {
                DaysCell.innerHTML = result.content.Days;
            }
            var GrossCell = sender.get_parent().get_cell("Gross");
            if (GrossCell["set_value"]) {
                GrossCell.set_value(result.content.Gross);
            } else {
                GrossCell.innerHTML = result.content.Gross;
            }
        }
        function override() {
            radprompt(result.message, callback, 400, 350, null, result.title || "Prompt - Override", false);
            function callback(promptArgs) {
                promptArgs = promptArgs || { "override": false, "note": "" };
                if (promptArgs.override && promptArgs.note.length > 0) {
                    args.Override = promptArgs.override;
                    args.OverrideNote = promptArgs.note;
                    console.log("(2nd) XHR POST [start] => args: %o", args);
                    var result = Paysheet.XHR.POST(args._uri, args);
                    console.log("(2nd) XHR POST [finished] - results: %o", result);
                    if ((result) ? result.isValid : false) {
                        console.log("[SUCCESS]");
                        sender._setNewValue(e.get_newValue());
                        var d = Paysheet.Common.GetDataKeyValues(sender);
                        //Update Gross;
                        var DaysCell = sender.get_parent().get_cell("Days");
                        if (DaysCell["set_value"]) {
                            DaysCell.set_value(result.content.Days);
                        } else {
                            DaysCell.innerHTML = result.content.Days;
                        }
                        var GrossCell = sender.get_parent().get_cell("Gross");
                        if (GrossCell["set_value"]) {
                            GrossCell.set_value(result.content.Gross);
                        } else {
                            GrossCell.innerHTML = result.content.Gross;
                        }
                    } else {
                        console.log("[FAILED]");
                        sender._SetValue(sender._initialValueAsText);
                        sender.updateDisplayValue();
                        if (result.StatusCode == 200) {
                            console.log("... Denied [RadAlert] Invoked...");
                            radalert(result.message || "Override request denied!", 400, 350, result.title || "Alert - Override Denied", null, null);
                        } else //if (result.StatusCode == 500)
                        {
                            console.log("... Error [RadAlert] Invoked...");
                            radalert(result.message || "Internal Error Occurred!", 400, 350, result.title || "Alert - Error", null, null);
                        }
                    }
                } else {
                    // ensuring the control retains the same value; for the prompt is async;
                    sender._SetValue(e.get_oldValue());
                    sender.updateDisplayValue();
                }
            }
        }
        function reject() {
            // neither of the following lines should be necessary, for the GenericResultHandler returns true|false to `e._cancel`
            // sender._SetValue(e.get_oldValue()); //This line works
            // e._cancel = true; //This line does not work
        }
    }
};

我已经穿过了这个密码，进入了telerik的密码。它似乎确实使用_initialValueAsText调用了_SetValue。我似乎并没有真正申请。

如果我在"reject"函数中显式设置了事件的cancel属性。它展示了同样的问题。

如果我明确地将发送方的值设置为旧值，它就可以工作了。

EDIT：我注释掉了xhr.send行（同步调用）-强制POST函数返回{ "isValid" : false, "isOverrideable" : false, "StatusCode": 500 }-问题仍然存在。