javascript 在 Knockout 视图模型定义之外设置属性值
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Set property value outside Knockout view model definition
提问by Nelson Reis
I have a Knockout view model defined like this:
我有一个这样定义的淘汰赛视图模型：
function viewModel () {
var self = this;
self.myName = ko.observable();
self.myValue = ko.observable("10");
};
Now I needed to change a value of the view model when a link was clicked, like this:
现在我需要在单击链接时更改视图模型的值，如下所示：
$('a.treeitem').live("click", function (e) {
e.preventDefault();
viewModel.myValue("20"); // this line does not work
});
However, I can't find out the correct way of setting the value, Chrome console shows the following message: Uncaught TypeError: Object function viewModel() { ... } has no method 'myValue'
但是，我找不到设置值的正确方法，Chrome 控制台显示以下消息： Uncaught TypeError: Object function viewModel() { ... } has no method 'myValue'
回答by soniiic
You can save the view model as a variable like this:
您可以将视图模型保存为这样的变量：
window.vm = new viewModel();
ko.applyBindings(vm);
$('a.treeitem').live("click", function (e) {
e.preventDefault();
window.vm.myValue("20");
});
Whenever you read from window.vmyou'll be reading from that actual instance of the viewModel object
每当您读取时，window.vm您都会读取 viewModel 对象的实际实例
回答by Nelson Reis
Actually, what I want to do can be done inside the view model definition, so I can change my code to this:
实际上，我想做的事情可以在视图模型定义中完成，因此我可以将代码更改为：
function viewModel () {
var self = this;
self.myName = ko.observable();
self.myValue = ko.observable("10");
$('a.treeitem').live("click", function (e) {
e.preventDefault();
self.myValue("20");
});
};
Now everything works fine. Sometimes, the right way reallyis the easy one.
现在一切正常。有时，正确的方法确实是简单的方法。
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