Knockout Js – 将一个项目从json数组绑定到一个元素
我有以下视图模型,其中包含一系列元素
function ReservationsViewModel() { var self = this; self.availableMeals = [ { mealName: "Standard (sandwich)", price: 0, id = 1 }, { mealName: "Premium (lobster)", price: 34.95, id = 2 }, { mealName: "Ultimate (whole zebra)", price: 290, id = 3 } ]; }
我想将此视图模型绑定到输入,但我想只绑定具有id值的Single数组元素的meal名称作为输入的data-id属性。
在这个例子中,我将绑定数组元素id = 1,文本将显示为“标准(三明治)”,但我仍然需要完整的绑定和更改跟踪(observables)和Knockout中的所有其他好东西。
如何获取data-id并在绑定代码中使用它来将适当的膳食绑定到输入?
提前致谢
建议的解决方案:
function ReservationsViewModel() { var self = this; self.availableMeals = ko.observableArray([ { mealName: "Standard (sandwich)", price: 0, id = 1 }, { mealName: "Premium (lobster)", price: 34.95, id = 2 }, { mealName: "Ultimate (whole zebra)", price: 290, id = 3 } ]); self.getMealById = function(id) { ko.utils.filterArray(self.availableMeals(), function(item) { return item.id == id; }); }; }
在视图中:
编辑:这是一个双向解决方案:
function ReservationsViewModel() { var self = this; self.availableMeals = ko.observable({ id_1: { mealName: "Standard (sandwich)", price: ko.observable(0) }, id_2: { mealName: "Premium (lobster)", price: ko.observable(34.95) }, id_3: { mealName: "Ultimate (whole zebra)", price: ko.observable(290) } }); } ko.applyBindings(new ReservationsViewModel());
在视图中: