淘汰赛 "You cannot apply bindings multiple times to the same element"

Question

我正在使用 kendo 移动应用程序构建器，我正在使用 knockout js 进行绑定，但出现错误“您不能将绑定多次应用于同一元素 ”。我有两个包含绑定的 javascript 文件，在我的代码下方

//Employee.js//

function EmployeeViewModel() {
   this.EmployeeName= ko.observable();
   this.EmployeeMobile= ko.observable();
   this.EmployeeEmail= ko.observable(); }
   ko.applyBindings(new EmployeeViewModel());

//Company.js//
function CompanyViewModel() {
   this.CompanyName= ko.observable();
   this.CompanyMobile= ko.observable();
   this.CompanyEmail= ko.observable(); }
   ko.applyBindings(new CompanyViewModel());

//In index page i am using this both script file drag and drop//
<html>
 <head>
 </head>
 <body>
  <script src="Employee.js"></script>
  <script src="Company.js"></script>
 </body>
</html>

Answer 1

多次应用绑定。您需要先清除绑定。

喜欢下面

var element = $('#elementId')[0]; 
ko.cleanNode(element);

然后只有您可以在同一元素上再次应用绑定。

Answer 2

"ko.applyBindings" 函数有两个参数：

applyBindings(viewModelOrBindingContext, rootNode);

首先 - 查看模型

第二个 - DOM 将应用绑定的节点

您调用 "ko.applyBindings" 方法两次 - 在两个函数中，仅使用第一个参数。这意味着您要将两个不同的模型绑定到同一个节点 - 文档根目录。这会导致错误。

您可以使用两种方法：

创建一个带子模型的全局视图模型并仅应用绑定一次：

//Employee.js//
function EmployeeViewModel() {
   this.EmployeeName= ko.observable();
   this.EmployeeMobile= ko.observable();
   this.EmployeeEmail= ko.observable();
}

//Company.js//
function CompanyViewModel() {
   this.CompanyName= ko.observable();
   this.CompanyMobile= ko.observable();
   this.CompanyEmail= ko.observable();
}

//In index page i am using this both script file drag and drop//
<html>
 <head>
 </head>
 <body>
  <script src="Employee.js"></script>
  <script src="Company.js"></script>
  <script>
   ko.applyBindings({ employee: new EmployeeViewModel(), company: new CompanyViewModel() });
  </script>
 </body>
</html>

将绑定应用于不同的节点：

```

//Employee.js
function EmployeeViewModel() {
   this.EmployeeName= ko.observable();
   this.EmployeeMobile= ko.observable();
   this.EmployeeEmail= ko.observable();
   ko.applyBindings(new EmployeeViewModel(), document.getElementById("employee"));
}

//Company.js
function CompanyViewModel() {
   this.CompanyName= ko.observable();
   this.CompanyMobile= ko.observable();
   this.CompanyEmail= ko.observable();
   ko.applyBindings(new CompanyViewModel(), document.getElementById("company"));
}

//In index page i am using this both script file drag and drop//
<html>
 <body>
  <script src="Employee.js"></script>
  <script src="Company.js"></script>
  <div id="employee"></div>
  <div id="company"></div>
 </body>
</html>

```

淘汰赛 "You cannot apply bindings multiple times to the same element"

Knockout Js "You cannot apply bindings multiple times to the same element"

javascript

jquery

knockout-mapping-plugin

knockout.js