Jquery Ajax - 返回布尔值？

新手问题，试图查明电子邮件是否已发送并显示结果，似乎无法使其正常工作。

function SendPreview() {
    var value = CKEDITOR.instances['Source'].getData();
    alert(value);
    var model = { EmailBody: value.toString(), EmailTo: $("#SendTo").val(), EmailSubject: $("#Subject").val() };
    var request = $.ajax({
        url: '/Campaign/SendPreviewEmail',
        async: false,
        type: 'POST',
        dataType: 'JSON',
        data: { model: JSON.stringify(model) },
        cache: false,
        success: function (data) {
            if (data) {
                alert("Message Sent");
            } else {
                alert("Message Not Sent, Please check details");
            }
        }
    });
}

[HttpPost]
[ValidateInput(false)]
public bool SendPreviewEmail(string model)
{
    var e = new EmailPreview();
    JavaScriptSerializer objJavascript = new JavaScriptSerializer();

    e = objJavascript.Deserialize<EmailPreview>(model);
    if (!string.IsNullOrEmpty(e.EmailTo) && !string.IsNullOrEmpty(e.EmailSubject) && !string.IsNullOrEmpty(e.EmailBody))
    {
        if (IsValidEmail(e.EmailTo))
        {
            _mailService.SendMail(account.Email, e.EmailTo, e.EmailSubject, e.EmailBody, true);
            return true;
        }
    }
    return false;
}

假设这是 ASP.Net MVC，您应该返回一个ActionResult来自你的行为（或者至少是由它衍生的东西）。下一个问题是返回true将意味着toString()将被称为bool值，产生字符串"True" or "False"。请注意，这两者都等于true在 JavaScript 中。相反，返回包含结果标志的 JSON。

在 jQuery 代码中你还设置了async: false这确实是一种不好的做法。事实上，如果您检查控制台，您会看到浏览器关于其使用的警告。您应该删除该属性，以便异步发出 AJAX 请求。您还设置了dataType to JSON in the ajax()调用，但实际上返回一个字符串。试试这个：

function SendPreview() {
    var value = CKEDITOR.instances['Source'].getData();
    var model = { EmailBody: value.toString(), EmailTo: $("#SendTo").val(), EmailSubject: $("#Subject").val() };
    var request = $.ajax({
        url: '/Campaign/SendPreviewEmail',
        type: 'POST',
        dataType: 'JSON',
        data: { model: JSON.stringify(model) },
        cache: false,
        success: function (data) {
            if (data.emailSent) { // note the object parameter has changed
                alert("Message Sent");
            } else {
                alert("Message Not Sent, Please check details");
            }
        }
    });
}

[HttpPost]
[ValidateInput(false)]
public ActionResult SendPreviewEmail(string model)
{
    var e = new EmailPreview();
    var result = false;
    JavaScriptSerializer objJavascript = new JavaScriptSerializer();

    e = objJavascript.Deserialize<EmailPreview>(model);
    if (!string.IsNullOrEmpty(e.EmailTo) && !string.IsNullOrEmpty(e.EmailSubject) && !string.IsNullOrEmpty(e.EmailBody))
    {
        if (IsValidEmail(e.EmailTo))
        {
            _mailService.SendMail(account.Email, e.EmailTo, e.EmailSubject, e.EmailBody, true);
            result = true;
        }
    }
    return Json(new { emailSent = result });
}