是否可以在淘汰数据绑定阶段使用 Enumerable?如果我首先执行 ToArray,我只能让它工作,这将消耗 Enumerable
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1 回答
0
您可以编写自己的 foreach 变体来使用 Enumerables。
ko.bindingHandlers['foreach2'] = {
makeTemplateValueAccessor: function(valueAccessor) {
return function() {
var bindingValue = ko.utils.unwrapObservable(valueAccessor());
if (bindingValue instanceof Enumerable) {
bindingValue = bindingValue.ToArray();
}
// If bindingValue is the array, just pass it on its own
if ((!bindingValue) || typeof bindingValue.length == "number")
return { 'foreach': bindingValue, 'templateEngine': ko.nativeTemplateEngine.instance };
// If bindingValue.data is the array, preserve all relevant options
return {
'foreach': bindingValue['data'],
'includeDestroyed': bindingValue['includeDestroyed'],
'afterAdd': bindingValue['afterAdd'],
'beforeRemove': bindingValue['beforeRemove'],
'afterRender': bindingValue['afterRender'],
'templateEngine': ko.nativeTemplateEngine.instance
};
};
},
'init': function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
return ko.bindingHandlers['template']['init'](element, ko.bindingHandlers['foreach2'].makeTemplateValueAccessor(valueAccessor));
},
'update': function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
return ko.bindingHandlers['template']['update'](element, ko.bindingHandlers['foreach2'].makeTemplateValueAccessor(valueAccessor), allBindingsAccessor, viewModel, bindingContext);
}
};
http://jsfiddle.net/madcapnmckay/QeEQg/
希望这可以帮助。
于 2012-05-08T16:35:07.377 回答