将新的 Observable 添加到由 ko.mapping.fromJS 映射的 ObservableArray
Adding new Observable to ObservableArray mapped by ko.mapping.fromJS
我正在尝试将一个新的可观察数组添加到最初使用KO的映射插件映射的可观察数组中。但我不明白这一点。Firebug告诉我"TypeError:totalChf不是一个函数"。查看添加的可观察函数,我注意到没有创建计算函数。我已经尝试了几种方法,仍然没有成功...我错过了什么?
提前致谢
这里的代码:
var vm;
var ClientsMapping = {
create: function (options) {
var client = ko.mapping.fromJS(options.data, ContainersMapping)
//Some computed observables for level one here...
return client;
}
}
var ContainersMapping = {
'Containers': {
create: function (options) {
var container = ko.mapping.fromJS(options.data, MoneyAccountsMapping)
container.totalChf = ko.computed(function () {
var total = 0;
$.each(container.MoneyAccounts(), function () {
if (this.Currency() == "CHF") {
total += this.Amount();
}
})
return total;
})
//Some computed observables for level two here...
return container;
}
}
}
var MoneyAccountsMapping = {
'MoneyAccounts': {
create: function (options) {
var macc = new MoneyAccountModel(options.data)
//Some computed observables for level three here...
return macc;
}
}
}
var ClientModel = function (data) {
ko.mapping.fromJS(data, {}, this);
}
var ContainerModel = function (data) {
ko.mapping.fromJS(data, {}, this);
}
var MoneyAccountModel = function (data) {
ko.mapping.fromJS(data, {}, this);
}
var data = [
{
'Clients': 'Thomas',
'Containers': [
{
'ContName': 'Cont01',
'MoneyAccounts': [
{ Currency: "CHF", Amount: 1000 },
]
}
]
},
{
'Clients': 'Ann',
'Containers': [
{
'ContName': 'Cont01',
'MoneyAccounts': [
{ Currency: 'CHF', Amount: 1000 },
{ Currency: 'EUR', Amount: 500 }
]
}
]
}
]
function viewModel() {
var self = this;
self.clients = ko.observableArray()
self.clientsCount = ko.computed(function () {
return self.clients().length
})
}
$(function () {
vm = new viewModel();
vm.clients(ko.mapping.fromJS(data, ClientsMapping)());
var cont1 = {
'ContName': 'ContXX',
'MoneyAccounts': [
{ Currency: "XXX", Amount: 1000 },
]
};
var cont2 = {
'ContName': 'ContYY',
'MoneyAccounts': [
{ Currency: "YYY", Amount: 1000 },
]
};
var cont3 = {
'ContName': 'ContZZ',
'MoneyAccounts': [
{ Currency: "ZZZ", Amount: 1000 },
]
};
var cont4 = {
'ContName': 'ContWW',
'MoneyAccounts': [
{ Currency: "WWW", Amount: 1000 },
]
};
vm.clients()[0].Containers.push(ko.mapping.fromJS(cont1, ContainersMapping));//Attempt1
vm.clients()[0].Containers.push(ko.mapping.fromJS(cont2));//Attempt2
vm.clients()[0].Containers.push(new ContainerModel(cont3));//Attempt3
vm.clients()[0].Containers.push(ko.mapping.fromJS([cont4], ContainersMapping)()[0]);//Attempt4
//...still no success.
})
您通常希望使映射彼此独立。执行此操作的一个好方法是在每个类中定义和执行映射:
var ClientModel = function(data) {
var mapping = {
'Containers': {
create: function(options) {
var container = new ContainerModel(options.data)
//Some computed observables for level two here...
return container;
}
}
}
ko.mapping.fromJS(data, mapping, this);
}
组织完后,您有几个选项可以将新项添加到 observableArray:
创建新项并将其推送到数组:
vm.clients()[0].Containers.push(new ContainerModel(cont1))
在映射中指定一个键选项:
var mapping = { 'Containers': { key: function(item) { return ko.unwrap(item.ContName); }, create: function(options) { var container = new ContainerModel(options.data) //Some computed observables for level two here... return container; } } }
然后使用 mappedCreate 添加项目:
vm.clients()[0].Containers.mappedCreate(cont1);
JSFiddle
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