Javascript KnockoutJS-bootstrap3模式绑定不'；行不通

我有一个引导模式div：

<div class="modal fade" id="modalLoginData" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
    <div class="modal-dialog">
        <div class="modal-content">
            <div class="modal-header">
                <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
                <h4 class="modal-title" id="myModalLabel">Login Data</h4>
        </div>

        <div class="modal-body">
            <div class="form-group col-lg-12 col-md-12 col-sm-12 col-xs-12">
                <label class="sr-only">Username</label>
                <input type="text" class="form-control" placeholder="Username" data-bind="value: username" />
            </div>   

            <div class="form-group col-lg-6 col-md-6 col-sm-12 col-xs-12">
                <label class="sr-only">Password</label>
                <input type="password" class="form-control" placeholder="Password" data-bind="value: password"  />
            </div>   

            <div class="form-group col-lg-6 col-md-6 col-sm-12 col-xs-12">
                <label class="sr-only">Repeat your password</label>
                <input type="password" class="form-control" placeholder="Repeat your password" data-bind="value: repeatedPassword" />
            </div>   
            <div class="form-group col-lg-12 col-md-12 col-sm-12 col-xs-12">
                <label class="sr-only">Login</label>
            </div>
        </div>

        <div class="modal-footer">
            <button type="button" class="btn btn-success btn-sm" data-bind="click: confirmLoginData">Confirm</button>
            <button type="button" class="btn btn-default btn-sm" data-dismiss="modal" data-bind="click: cancelLoginData">Cancel</button>
        </div>
    </div>
</div>

。。。该值正确显示在该模态分区外部的跨度元素上

<span data-bind="text: username"></span>

。。。但是没有在上面的modal div中处理这个文本框

有人知道发生了什么吗

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谢谢

正如其他人已经提到的，发布更完整的代码版本将大大有助于其他人帮助您。如果不发布您编写的javascript，人们只能猜测您正在做什么

这就是说，这里是一个模态的示例，其中knockout确实在模态内部和外部显示用户名

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发布“打开此模式”的JS代码。还有可能是viewmodel。一个JSFIDLE显示这个问题是值得的。

<span data-bind="text: username"></span>

$('#modalLoginData').modal();

function Model() {
    this.username = ko.observable("kiwanax");
    this.password = ko.observable();
    this.repeatedPassword = ko.observable();
    this.cancelLoginData = function () {
        console.log( 'cancel!' );
    };
    this.confirmLoginData = function () {
         console.log( 'confirm login data!' );
    };
}

ko.applyBindings(new Model());