Question

经过大量的研究和追踪和错误，我还没有找到解决方案。请帮忙！代码中的SearchCustomer方法对有效且不起作用的方案有评论。

场合

我使用knockoutjs和映射插件。我从服务器获取一个包含Workorder的视图模型，它包含一些关于它的属性以及它下面的Customer模型和Customer下面的Contact模型。

在工作订单屏幕上，用户可以搜索弹出模态搜索窗口的客户。他们选择该客户，并且客户的ID和客户模型返回到工作订单。我更新了工作订单的customerID没问题，但是当我尝试更新客户数据（包括联系人）时，我收到函数预期错误。

代码

function WorkorderViewModel(data) {
    var self = this;
    data = data || {};
    mapping = {
        'Workorder': {
            create: function (options) {
                return new Workorder(options.data, self);
            }
        }
    }

    ko.mapping.fromJS(data, mapping, self);

    self.ViewCustomer = function () {
        self.Workorder.Customer.View();
    }

    self.SearchCustomer = function () {
        self.Workorder.Customer.Search(function (customerID, customer) {
            self.Workorder.CustomerID(customerID); //Works
            self.Workorder.Customer(customer) //Function Expected, I feel this should work! Please help!
            self.Workorder.Customer = new Customer(customer, self.Workorder); //No Error doesn't update screen
            self.Workorder.Customer.Contact.FirstName(customer.Contact.FirstName); //Works, updates screen, but I don't want to do this for every property.
            self.Workorder.SaveAll(); //Works, reload page and customer data is correct.  Not looking to reload webpage everytime though.
        })
    }
}

function Workorder(data, parent) {
    var self = this;
    data = data || {};
    mapping = {
        'Customer': {
            create: function (options) {
                return new Customer(options.data, self);
            }
        }
    }

    ko.mapping.fromJS(data, mapping, self);
}

function Customer(data, parent) {
    var self = this;
    data = data || {};
    mapping = {
        'Contact': {
            create: function (options) {
                return new Contact(options.data, self);
            }
        }
    }

    ko.mapping.fromJS(data, mapping, self);
}

function Contact(data, parent) {
    var self = this;
    data = data || {};
    mapping = {};

    ko.mapping.fromJS(data, mapping, self);

    self.AddedOn = ko.observable(moment(data.AddedOn).year() == 1 ? '' : moment(data.AddedOn).format('MM/DD/YYYY'));

    self.FullName = ko.computed(function () {
        var fullName = '';

        if (self.FirstName() != null && self.FirstName() != '') {
            fullName = self.FirstName();
        }

        if (self.MiddleName() != null && self.MiddleName() != '') {
            fullName += ' ' + self.MiddleName();
        }

        if (self.LastName() != null && self.LastName() != '') {
            fullName += ' ' + self.LastName();
        }

        return fullName;
    })
}

谢谢大家！

Answer 1

尝试更改：

self.Workorder.Customer(customer);

为：

self.Workorder.Customer = customer;

我的猜测是，Workorder的Customer属性不是可观察的。

Answer 2

由于self.Workorder.Customer最初是使用ko.mapping填充的，因此当您想要重新填充时，您应该再次使用ko.mapping，例如：

ko.mapping.fromJS(customer, self.Workorder.Customer)

Knockoutjs函数在更新模型时的预期异常

2 个答案: