将NVelocity与KnockoutJS结合使用时的ParseException

Question

我正在尝试用NVelocity做一些关于击倒的教程。一切都很好，但当涉及到模板时就会出现问题。当我到达this tutorial的第三步时，它在${meal().mealName}行中给出了一个错误。有人能给我解释一下为什么会这样吗？

下面是堆栈跟踪：

[ParseException: Encountered "().mealName}</td>\r\n            <td>" at line 50, column 23.
Was expecting one of:
    "}" ...
    <DOT> ...
    ]
   NVelocity.Runtime.Parser.Parser.Parse(TextReader reader, String templateName) +257
   NVelocity.Runtime.RuntimeInstance.Parse(TextReader reader, String templateName, Boolean dumpNamespace) +327
   NVelocity.Runtime.RuntimeInstance.Parse(TextReader reader, String templateName) +71
   NVelocity.Template.Process() +252

[ParseErrorException: Encountered "().mealName}</td>\r\n            <td>" at line 50, column 23.
Was expecting one of:
    "}" ...
    <DOT> ...
    ]
   NVelocity.Template.Process() +585
   Castle.MonoRail.Framework.Views.NVelocity.CustomTemplate.Process() +266
   Castle.MonoRail.Framework.Views.NVelocity.CustomResourceManager.ProcessResourceWithSensibleExceptionWrapping(String resourceName, Resource resource) +67

[ResourceProcessingException: Unable to process resource 'Home\index.vm': Encountered "().mealName}</td>\r\n            <td>" at line 50, column 23.
Was expecting one of:
    "}" ...
    <DOT> ...
    ]
   Castle.MonoRail.Framework.Views.NVelocity.CustomResourceManager.ProcessResourceWithSensibleExceptionWrapping(String resourceName, Resource resource) +117
   Castle.MonoRail.Framework.Views.NVelocity.CustomResourceManager.GetResource(String resourceName, ResourceType resourceType, String encoding) +663
   NVelocity.Runtime.RuntimeInstance.GetTemplate(String name, String encoding) +81
   NVelocity.Runtime.RuntimeInstance.GetTemplate(String name) +104
   NVelocity.App.VelocityEngine.GetTemplate(String name) +71
   Castle.MonoRail.Framework.Views.NVelocity.NVelocityViewEngine.Process(String viewName, TextWriter output, IEngineContext context, IController controller, IControllerContext controllerContext) +593
   Castle.MonoRail.Framework.Services.DefaultViewEngineManager.Process(String templateName, TextWriter output, IEngineContext context, IController controller, IControllerContext controllerContext) +262
   Castle.MonoRail.Framework.Controller.ProcessView() +170
   Castle.MonoRail.Framework.Controller.RunActionAndRenderView() +2529
   Castle.MonoRail.Framework.Controller.Process(IEngineContext engineContext, IControllerContext context) +74
   Castle.MonoRail.Framework.BaseHttpHandler.Process(HttpContext context) +175

[MonoRailException: Error processing MonoRail request. Action index on controller Home]
   Castle.MonoRail.Framework.BaseHttpHandler.Process(HttpContext context) +505
   Castle.MonoRail.Framework.BaseHttpHandler.ProcessRequest(HttpContext context) +53
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +100
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75

Answer 1

$是用于NVelocity和jQuery的特殊符号(默认情况下)，这会导致冲突。但是，可以使用jQuery.noConflict为jQuery重新定义这一点。使用它，你可以将jQuery的$设置为其他一些符号，尽管我不能100%确定这是否也适用于jQuery模板(这正是knockout所使用的)。

或者，您可能希望使用try using data-bind instead of ${ ... }