如何在javascript中访问当前rails对象id
[英]How to access the current rails object id in javascript
问题描述
If I am on a view, how can I access the ID of the ruby object that is currently represented by that view? 
如果我在视图上，如何访问该视图当前表示的ruby对象的ID？
Eg If I am on blah.com/jobs/1 how do I get 1? 例如，如果我在blah.com/jobs/1 ，我怎么得到1？
I thought about trimming the current URL but that seems way too brittle, especially given I have nested resources. 我考虑过修剪当前的URL，但这似乎太脆弱了，特别是考虑到我有嵌套资源。 The only other easy way I can think of is to have a hidden field but it seems silly to have a hidden input on a show page where there aren't any forms. 我能想到的另一个简单的方法就是拥有一个隐藏的字段，但在没有任何表格的节目页面上隐藏输入似乎很愚蠢。
4 个解决方案
解决方案1
10 已采纳 2012-03-16 07:34:01
You're right that parsing the URL is a bad idea, you're better off explicitly supplying it somewhere. 你解析URL是个坏主意，你最好明确地在某处提供它。
You could attach a data-job-id attribute to a standard element in the HTML, perhaps even <body> . 您可以将data-job-id属性附加到HTML中的标准元素，甚至可能是<body> 。 Then your JavaScript could do things like this: 然后你的JavaScript可以做这样的事情：
var id;
var $body = $('body');
if(id = $body.data('job-id'))
// Do some job things.
else if(id = $body('user-id'))
// Do some user things.
and you'd still be HTML5 compliant and you wouldn't have to muck about with hidden inputs. 并且你仍然符合HTML5标准，你不必沉溺于隐藏的输入。
You don't have to use <body> of course, your HTML probably has some top level container with a known id so you could use that instead. 当然，您不必使用<body> ，您的HTML可能有一些具有已知id顶级容器，因此您可以使用它。
解决方案2
4 2012-03-16 13:22:23
I'd suggest one of the following: 我建议以下之一：
As Jamsi suggested, include
<%= params[:id] %>or<%= @job[:id] %>directly in your javascript:正如Jamsi建议的那样，直接在您的javascript中包含<%= params[:id] %>或<%= @job[:id] %>：var id = <%= @job[:id] %>If your javascript is in a separate file, follow Mu's advice.
如果您的javascript位于单独的文件中，请遵循Mu的建议。 Add the <%= @job[:id] %>to one of your view's html tags, and query it.将<%= @job[:id] %>到您的一个视图的html标记中，然后进行查询。
解决方案3
3 2012-03-16 11:28:34
不仅仅是<％= params [：id]％>吗？
解决方案4
1 2015-06-24 15:51:10
Here is a complete example, combining from the answers already provided. 这是一个完整的例子，结合已经提供的答案。
Using the params[:id] and the body element, the following inline statement will produce a data-params-id attribute, that can be used generically in a layout file: 使用params[:id]和body元素，以下内联语句将生成data-params-id属性，该属性可以在布局文件中一般使用：
<body <%= "data-params-id=#{params[:id]}" if params.has_key?(:id) %> >
This can then be accessed with the following: 然后可以使用以下方法访问它：
JavaScript: JavaScript的：
var dataId = document.body.getAttribute('data-params-id');
jQuery: jQuery的：
var dataId = $('body').data('params-id');
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