为什么我无法在此自定义绑定中获取当前的 viewModel？
这是包含我的绑定的 .haml 代码。我删除了不相关的绑定。
#date-extension
.filter-extension-container
.filter-extension-button
.button-close
#hand-graph-container{"data-bind" => "with:dateGraph"}
#x-axis
#hand-graph{"data-bind" => "foreach: {data:graphData}"}
%div{"data-bind" => "interactiveBar: $data"}
我开始了自定义绑定，就像这样。
ko.bindingHandlers.interactiveBar = {
init: function(element, valueAccessor, allBindingsAccessor, viewModel) {
debugger;
},
update: function(element, valueAccessor, allBindingsAccessor, viewModel) {
}
};
但是当我查看 viewModel 时，它等于 valueAccessor 并且只是我传入的数据对象。我想访问 dateGraph viewModel，并且应该能够访问它，因为我已经使用了“with: graphData”根据文档。
This is the .haml code that contains my bindings. I removed bindings that weren't relevant.
#date-extension
.filter-extension-container
.filter-extension-button
.button-close
#hand-graph-container{"data-bind" => "with:dateGraph"}
#x-axis
#hand-graph{"data-bind" => "foreach: {data:graphData}"}
%div{"data-bind" => "interactiveBar: $data"}
And I have the beginnings of a custom binding, like so.
ko.bindingHandlers.interactiveBar = {
init: function(element, valueAccessor, allBindingsAccessor, viewModel) {
debugger;
},
update: function(element, valueAccessor, allBindingsAccessor, viewModel) {
}
};
But when I look at viewModel, it is equal to the valueAccessor and is just the data object that I'm passing in. I'd like access to the dateGraph viewModel, and should be able to access it since I have used "with: graphData" according to the documentation.
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在
foreach内部，viewModel属性是在该范围级别绑定的数据。有几个选项（假设您使用的是 Knockout 2.0）：
传递
$parent而不是$data并访问您的dateGraph对象通过valueAccessor()或者绑定处理程序的第五个参数实际上是绑定上下文。绑定上下文将具有
$data、$parent、$parents和$root属性。您可以在此处查看属性的说明。Inside of a
foreachtheviewModelproperty is the data being bound at that scope level.There are a couple of options (assuming you are using Knockout 2.0):
pass
$parentinstead of$dataand access yourdateGraphobject viavalueAccessor()or the 5th argument to a binding handler is actually the binding context. The binding context will have
$data,$parent,$parents, and$rootproperties. You can see a description of the properties here.