第二个应用绑定不会触发



可能重复:
KnockoutJS:ko.applyBindings到局部视图?

我在jQuery中使用了knockout。作为下面的基本示例的结果,文本"Planet Earth"显示得很好(因此删除添加正确并且有效!(,但不显示"Planet2 Earth2"。此外,alert('alert2');被激发,但alert('alert3');没有被激发。有人能解释一下为什么吗?

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title></title>
    <script src="Scripts/jquery-1.9.0.min.js" type="text/javascript"></script>
    <script src="Scripts/knockout-2.2.1.js" type="text/javascript"></script>
<script>
    $(document).ready(function () {
        alert("alert1");
        var viewModel = {
            firstName: ko.observable("Planet"),
            lastName: ko.observable("Earth")
        };
        viewModel.fullName = ko.dependentObservable(function () {
            return viewModel.firstName() + " " + viewModel.lastName();
        });
        alert("alert2");
        ko.applyBindings(viewModel);
        alert('alert3');

        var viewModel2 = {
            firstName2: ko.observable("Planet2"),
            lastName2: ko.observable("Earth2")
        };
        viewModel2.fullName2 = ko.dependentObservable(function () {
            return viewModel2.firstName2() + " " + viewModel2.lastName2();
        });
        ko.applyBindings(viewModel2);
    });
</script>
</head>
<body>
<div style="border:1px solid red;">   
<p>First name: <input data-bind='value: firstName' /></p> 
<p>Last name: <input data-bind='value: lastName' /></p> 
<h2>Hello, <span data-bind='text: fullName'> </span>!</h2>  
</div>
<div style="border:1px solid green;">   
<p>First name: <input data-bind='value: firstName2' /></p> 
<p>Last name: <input data-bind='value: lastName2' /></p> 
<h2>Hello, <span data-bind='text: fullName2'> </span>!</h2>  
</div>
</body>
</html>

要使其工作,您必须修改4行:

应用id s:

<div id="one" style="border:1px solid red;">

<div id="two" style="border:1px solid green;">

以及对applyBindings使用第二个参数:

ko.applyBindings(viewModel,document.getElementById("one"));

ko.applyBindings(viewModel2,document.getElementById("two"));

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