可观察数组搜索的常规功能 [英] General function for observable array search

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

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