剔除绑定-选择第一个填充的对象 [英] Knockout binding - select first filled object

问题描述

我具有以下KnockoutJS代码，以便为Addresses Form Editor进行数据绑定，在其中我可以具有4种地址类型("home"，"office"等).

I have the following KnockoutJS code in order to make a databinding for a Addresses Form Editor where I can have 4 address types ("home", "office", etc).

http://jsfiddle.net/mxgFQ/1/

现在一切正常，但是selectedAddress被硬编码为索引0

Right now everything is working great but the selectedAddress is being hardcoded to be the index 0

self.selectedAddress = ko.observable(self.addresses[0]);

我不想选择执行此操作，而是选择第一个填充了数据的地址对象.

Instead of doing this I want to selected the first address object that has data filled in.

关于如何执行此操作的任何线索?

Any clue on how to do this?

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推荐答案

Knockout的实用程序函数提供了非常方便的arrayFirst函数，该函数非常简单:

Knockout's utility function provides the very convienent arrayFirst function, which makes this simple:

self.selectedAddress = ko.observable(
        ko.utils.arrayFirst(self.addresses(), function(item) {
            return item.address1().length > 0;
        }));

这是更新的小提琴.

这里是 KO的实用程序功能:

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