基于变量输出的单选按钮默认选中值 [英] radio button default checked value based on variable output

问题描述

我坚持要完成这项工作.我有一个数组 @names = ['abc', 'bbc', 'xyz'] 我正在为它构建单选按钮，如下所示.

I am stuck to make this work. I have an array @names = ['abc', 'bbc', 'xyz'] for which I am building the radio button as follows.

<% @names.each do |n| %>
<%= f.radio_button :name, n, :checked => "checked" %>
  <%= f.label :name, n.capitalize %>
<% end %>

我有另一个变量 @select = 'bbc' 它包含必须在上述单选按钮中选择的字符串.目前，最后一个单选按钮正在接受检查，即 'xyz'.如何实现这一目标.请帮忙.

I have another variable @select = 'bbc' which contains the string which has to be selected among the above radio buttons. Currently the last radio button is getting check i.e, 'xyz'. How to achieve this. Please help.

推荐答案

您的代码实际上是将 checked="checked" 属性设置为每个单选输入，这没有意义，因为单选按钮是多个选项中的一个答案.

Your code is actually setting the attribute checked="checked" to every radio input, which does not make sense since Radio Buttons are there for a single answer among multiple choices.

添加一个小测试以仅检查一个单选按钮:

Add a small test to check only one radio button:

<% @names.each do |n| %>
  <%= f.radio_button :name, n, :checked => n == @select %>
  <%= f.label :confidentiality_level, n.capitalize %>
<% end %>

长版:

<% @names.each do |n| %>
  <% if @select == n # tests if n is equal to 'xyz' or whatever %>
    <%= f.radio_button :name, n, :checked => "checked" %>
  <% else %>
    <%= f.radio_button :name, n %>
  <% end %>
  <%= f.label :confidentiality_level, n.capitalize %>
<% end %>

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