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使用ko.mapping.fromJSON只要定义了嵌套对象,我就可以从JSON进行绑定。当我将嵌套对象更新为空或空时,绑定就会中断。Knockout映射嵌套对象绑定在null时不更新
在此代码中,我有五个不同的数据集,我使用model.nextDataset函数进行迭代。当数据集到达第四个和第五个变体时,它将中断与内部对象的绑定。
var datasets = ["{\"id\": 1,\"reference\": \"reference1\",\"inner\": {\"id\": 1,\"name\": \"name1\"}}",
"{\"id\": 1,\"reference\": \"reference2\",\"inner\": {\"id\": 1,\"name\": \"name2\"}}",
"{\"id\": 1,\"reference\": \"reference3\",\"inner\": {\"id\": null,\"name\": null}}",
"{\"id\": 1,\"reference\": \"reference3\",\"inner\": {}}",
"{\"id\": 1,\"reference\": \"reference3\",\"inner\": null}"];
var mapping = {
'create': function (options) {
return new Model(options.data);
},
'key': function (data) {
return ko.utils.unwrapObservable(data.id);
},
'inner': {
'create': function (options) {
return new InnerModel(options.data);
}
},
'key': function (data) {
return ko.utils.unwrapObservable(data.id);
}
};
/*
var innerMapping = {
'key': function(data) {
return ko.utils.unwrapObservable(data.id);
}
};
*/
var InnerModel = function (data) {
var self = this;
ko.mapping.fromJS(data, {}, self);
self.innerName = ko.computed(function() {
return self.name() + " computed";
}, self);
};
var Model = function (data) {
var self = this;
ko.mapping.fromJS(data, mapping, self);
self.innerName = ko.computed(function() {
return self.inner.name() + " computed";
}, self);
}
var model = {
dataset: ko.observable(0),
model: ko.mapping.fromJSON(datasets[0], mapping, model),
nextDataset: function() {
model.dataset(model.dataset() + 1);
if (datasets.length === model.dataset()) {
model.dataset(0);
}
ko.mapping.fromJSON(datasets[model.dataset()], mapping, model.model);
}
}
ko.applyBindings(model);
伴随HTML:
<div id="testko">
<p>Dataset: <span data-bind="text: dataset"></span><p>
<input type="text" data-bind="value: model.reference" /><br>
<div data-bind="with: model.inner"><input type="text" data-bind="value: innerName" /><br></div>
<input type="text" data-bind="value: model.innerName" /><br>
<input type="button" data-bind="click: nextDataset" value="Next Dataset" />
</div>
我已经做了的jsfiddle,试图证明这一点:
我相信,我错误地以某种方式映射,但我避风港” t已经足够长的时间来使用淘汰赛来说明原因。
您正在访问inner.name,但inner为空! – LostInComputer