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

问题描述

我似乎找不到将类添加到由 Rails 生成的选择标记的语法 collection_select.有什么帮助吗?

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 助手接受多个哈希参数.第一个通常是控制助手本身的选项，第二个是 html_options，您可以在其中指定自定义 id、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:

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

您会注意到参数列表中的多个= {}".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'})

如果除了 html 类之外没有任何选项可以指定，那么只需放置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 文档位于: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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