我想知道如果我可以访问knockout.js主视图模型从方法视图模型本身的范围之外。 就拿这个例子:
function Employee(data) {
var self = this;
ko.mapping.fromJS(data, {}, this);
}
function EmployeeViewModel() {
var self = this;
this.employees = ko.observableArray([]);
this.loadEmployees = function() {
var mappedEmployees= $.map(JSON.parse(data.value), function(item) { return new Employee(item) });
self.employees (mappedEmployees);
}
}
// here's the part I'm curious about
$(document).ready(function() {
ko.applyBindings(new EmployeeViewModel());
$("#myLink").click(function() {
// is there some way to get back into the ko context here?
// like with ko.dataFor or ko.contextFor?
});
}
你总是可以仅仅通过存储您的视图模型中的变量,你可以访问,该访问模块,揭示模块的模式很不错,但你可以将其存储在一个对象,不会与其他名称冲突(“我”在这里):
my = { viewModel: new EmployeeViewModel() };
ko.applyBindings(my.viewModel);
你有正确的想法,你只需要采取的元素作为参数传递给你的点击功能,并通过目标属性ko.dataFor或ko.contextFor( 的jsfiddle ):
$(document).ready(function() {
my.vm = new EmployeeViewModel();
ko.applyBindings(my.vm);
$('button').on('click', function(e) {
alert('you clicked on employee ' + ko.contextFor(e.target).$data.name() +
' also known as ' + ko.dataFor(e.target).name());
});
});
相反,使用jQuery click事件绑定的,你可以随时使用的淘汰赛点击结合 ,其通过作为第一个参数和事件作为第二个参数(电流模型数据的jsfiddle ):
function EmployeeViewModel() {
var self = this;
// skipped some of your code
this.clickedOnEmployee = function(model, event) {
// assuming your Employee has a name observable
alert('You clicked on employee ' + model.name());
};
}
在HTML($的根是您的基本视图模型,你就不需要它,如果你clickedOnEmployee功能是在你的Employee对象):
<ul data-bind="foreach: employees">
<li>
<span data-bind="text: name"></span>
<button data-bind="click: $root.clickedOnEmployee">show</button>
</li>
</ul>