Question

我使用 ko.mapping.fromJS 在从服务器获取数据后更新我的ViewModel。但这对我来说是一个问题。

在ko.mapping.fromJS之后，我获得了包含更新属性的View。但每次使用新数据重新创建属性时，都不会更新现有属性。

如何操作以获取ViewModel的更新属性，而不是使用新数据重新创建属性？

Answer 1

Let’s say you have a JavaScript object that looks like this:

var data = {
    name: 'Scot',
    children: [
        { id : 1, name : 'Alicw' }
    ]
}
You can map this to a view model without any problems:

var viewModel = ko.mapping.fromJS(data);
Now, let’s say the data is updated to be without any typos:

var data = {
    name: 'Scott',
    children: [
        { id : 1, name : 'Alice' }
    ]
}
Two things have happened here: name was changed from Scot to Scott and children[0].name was changed from Alicw to the typo-free Alice. You can update viewModel based on this new data:

ko.mapping.fromJS(data, viewModel);

最后一个字符串显示了如何使用新数据更新viewModel。

ko.mapping.fromJS更改对象而不重新创建

1 个答案: