如何在Rails中设置collection_select的HTML选项？ [英] How do I set the HTML options for collection_select in Rails?

问题描述

我似乎找不到添加一个类到Rails生成的select标签的语法 collection_select 。一些帮助？

I can't seem to find the syntax to add a class to a select tag generated by Rails collection_select. Some help?

推荐答案

许多Rails帮助者需要多个哈希参数。第一个通常是控制帮助器本身的选项，第二个是html_options，您指定自定义ids，类等。

Many Rails helpers take multiple hash arguments. The first is usually the options to control the helper itself, and the second is the html_options where you specifiy custom ids, classes etc.

方法定义如下所示： / p>

The method definition looks like this:

collection_select(object, method, collection, value_method, text_method, options = {}, html_options = {})

你会注意到params列表中的多个'= {}'。要使用它，您要指定的第一组选项实际上必须括在大括号中：

You'll notice the multiple '= {}' in the params list. To use this, the first set of options that you would specify must actually be enclosed in braces:

collection_select(:user, :title, UserTitle.all, :id, :name, {:prompt=>true}, {:class=>'my-custom-class'})

如果您没有任何选项可以指定html类除外，那么只需放一个空的哈希占位符：

If you don't have any options to specify besides the html class, then just put an empty hash placeholder:

collection_select(:user, :title, UserTitle.all, :id, :name, {}, {:class=>'my-custom-class'})

其他API文档可在：
http://apidock.com/rails/ActionView/Helpers/FormOptionsHelper/collection_select

Additional API documentation is available at: http://apidock.com/rails/ActionView/Helpers/FormOptionsHelper/collection_select

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