可观察数组搜索的常规功能

本文介绍了可观察数组搜索的常规功能的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

有没有一种方法可以执行一般功能来搜索可观察数组，如果找到的值将该对象设置为另一个可观察对象. 这个问题与 知道选择:按项目设置所选项目名称不是值

is there a way to do a general function for search an observable array and if the value found then set that object to another observable .? this question relate to Knokout select : Set Selected Item by item name not value

到目前为止，我已经尝试过

so far i have tried

self.getOptionByName = function(instance,opt,name){ console.log(instance()[x]+'."'+opt+'"'); for (var x = 0; x < instance().length; x++) { console.log(instance()[x].opt); if (instance()[x].opt == name) return instance()[x]; } return null; }

并称为

self.IssuingcountrySelected(self.popup.getOptionByName(self.issuingCountries,'Country','Japan'))

我的可观察数组是

0: ObjectCoordinatorRegion: "EU" Country: "Australia" CountryId: 14 Id: 1 2: ObjectCoordinatorRegion: "AU" Country: "Japan" CountryId: 16 Id: 2

推荐答案

尝试类似的方法

viewModel:

var ViewModel = function () { var self = this; self.IssuingcountrySelected = ko.observable(); self.issuingCountries = ko.observableArray(json); var getOptionByName = function (instance, opt, name) { return ko.utils.arrayFirst(instance, function (item) { //returns first matched record if (item[opt] == name) { return item[opt]; } }); } self.IssuingcountrySelected(getOptionByName(self.issuingCountries(), 'Country', 'Japan')) //You get the matched object else null console.log(self.IssuingcountrySelected()) // check console };

示例工作小提琴 此处

sample working fiddle here