首页 \ 问答 \ 使用jQuery的Rails中不显眼的动态表单字段(Unobtrusive dynamic form fields in Rails with jQuery)

使用jQuery的Rails中不显眼的动态表单字段(Unobtrusive dynamic form fields in Rails with jQuery)

 我试图在Rails中摆脱动态表单域的障碍 - 这似乎是框架不能很好地处理的东西。 我也在我的项目中使用jQuery。 我已经安装了jRails，但是我更希望在可能的情况下不引人注目地编写AJAX代码。 
 

 我的形式是相当复杂的，两到三个层次的嵌套并不常见。 我遇到的问题是生成正确的表单ID，因为它们依赖于表单构建器上下文。 我需要能够动态添加新字段或删除has_many关系中的现有记录，我完全失去了。 
 

 到目前为止，我看到的每个例子都是以某种方式丑陋的。 Ryan Bates的教程需要RJS，这会在标记中导致一些非常丑陋的突触性JavaScript，并且似乎是在嵌套属性之前编写的。 我看到这个例子的一个叉子没有引人注目的jQuery，但我只是不明白它在做什么，并没有能够使它在我的项目中工作。 
 

 有人可以提供一个简单的例子，说明如何做到这一点。 在遵守控制器的REST风格约定的情况下，这甚至是可能的吗？ 
 

 

 安迪已经发布了一个删除现有记录的优秀示例，任何人都可以提供创建具有正确属性的新字段的示例？ 我无法弄清楚如何用嵌套表单来做到这一点。 

I'm attempting to get over the hurdle of dynamic form fields in Rails -- this appears to be something the framework doesn't handle very gracefully. I'm also using jQuery in my project. I have jRails installed, but I'd much rather write the AJAX code unobtrusively where possible.
 

My forms are fairly complex, two or three levels of nesting are not unusual. The problem I'm having is generating the correct form ids, since they are so dependant on the form builder context. I need to be able to dynamically add new fields or delete existing records in a has_many relationship, and I am completely at a loss.
 

Every example I've seen so far has been ugly in one way or another. Ryan Bates' tutorial requires RJS, which results in some pretty ugly obtrusive javascript in the markup, and seems to have been written before nested attributes. I've seen a fork of that example with unobtrusive jQuery, but I just don't understand what it's doing, and haven't been able to get it working in my project.
 

Can somebody provide a simple example of how this is done? Is this even possible while respecting the RESTful convention of the controllers?
 

 

Andy has posted an excellent example of deleting an existing record, can anybody provide an example of creating new fields with the correct attributes? I haven't been able to figure out how to do this with nested forms.

原文：https://stackoverflow.com/questions/1704142
更新时间：2022-04-26 20:04

最满意答案

 绑定重定向是.NET框架概念，.NET Standard和.NET Core上没有绑定重定向。 
 

 但是，应用程序（实际的.NET Framework或.NET Core应用程序）需要解析要使用的文件。 在.NET Core上，这是通过基于构建输入生成deps.json文件并且.NET Framework应用程序使用绑定重定向来完成的。 
 

 如果需要绑定重定向，则必须将它们添加到使用.NET标准库的.NET Framework应用程序（或库）中。 
 

 这些绑定重定向也可以在构建期间根据编译期间使用的程序集自动生成，请参阅有关自动绑定重定向的文档 。 当使用NuGet的新的PackageReference样式使用NuGet包时，这是自动完成的。 由于正确配置会因项目类型而异，请参阅.NET Framework和NuGet的.NET Standard 2.0公告，以获取详细说明。 
 

 确保使用正确的绑定重定向的最简单方法是确保.NET Framework应用程序或库设置这些属性（在csproj / vbproj中。对于生成.exe可执行文件但需要单元的项目，不需要第二个属性测试项目）： 
 

<PropertyGroup>
    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
    <GenerateBindingRedirectsOutputType>true</GenerateBindingRedirectsOutputType>
</PropertyGroup>


Binding redirects are a .NET framework concept, there are no binding redirects on .NET Standard and .NET Core.
 

However, an application (the actual .NET Framework or .NET Core application) need to resolve the files to be used. On .NET Core, this is done by generating a deps.json file based on the build input and a .NET Framework application uses binding redirects.
 

If a binding redirect is necessary, they have to be added to the .NET Framework application (or library) that used the .NET Standard library.
 

These binding redirects and also be automatically generated during build, based on the assemblies used during compilation, see the documentation on automatic binding redirects. When using NuGet's new PackageReference style of using NuGet packages, this is done automatically. Since configuring this correctly varies based on the project type, refer to the announcement Issues with .NET Standard 2.0 with .NET Framework & NuGet for detailed descriptions.
 

The simplest way to make sure that the correct binding redirects are used is to ensure the .NET Framework app or library sets these properties (inside the csproj/vbproj. The second one is not needed for projects that generate .exe executables but needed for unit test projects):
 

<PropertyGroup>
    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
    <GenerateBindingRedirectsOutputType>true</GenerateBindingRedirectsOutputType>
</PropertyGroup>

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