将NVelocity与KnockoutJS结合使用时出现ParseException

Question

我正在尝试用NVelocity做一些关于knockout的教程。一切都很好，但有问题，当它涉及到模板。当我到达本教程的第三步时，它在${meal().mealName}行给了我一个错误。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>rn            <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>rn            <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 'Homeindex.vm': Encountered "().mealName}</td>rn            <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

$是NVelocity和jQuery(默认情况下)的特殊符号，这会导致冲突。然而，这可以通过jQuery. noconflict重新定义。使用这个，你可以将jQuery的$设置为其他一些符号，虽然我不是100%确定这也适用于jQuery模板(这是什么击倒使用)。

或者，您可能想尝试使用data-bind而不是${ ... }