在HTML中设置下拉列表的默认值 - 特殊情况

Question

我在Rails视图（index.html.erb）中有多个下拉框。代码如下所示：

...... 
...... 
<td> 
<% @builds.each_with_index do |row,index| 
    if row2[0].to_s == row_s[0] %> 
     (When this condition is true I want to set the value of the dropdown list) 
      (The value could be PASS, FAIL or PENDING which comes from the database as row_s[7]) 

     <form id=<%= "build_status_form#{index}" %>> 
      <select name="condition" 
      id=<%= "build_status#{index}" %> onchange="this.form.submit()"> 
        <option value="PENDING">PENDING</option> 
        <option value="PASS">PASS</option> 
        <option value="FAIL">FAIL</option> 
      </select> 
     </form> 

    <% end %> 
<% end %> 
</td> 

如何动态设置每个下拉列表的默认值？

Answer 1

这可以在单行使用Rails助手

<form id=<%= "build_status_form#{index}" %>> 
    <%= select_tag :condition, options_for_select(%w[PENDING PASS FAIL], row_s[7]), id: "build_status#{index}", onchange: 'this.form.submit()' %> 
</form> 

Answer 2

如果要设置默认值PASS使用selected

<form id=<%= "build_status_form#{index}" %>> 
     <select name="condition" 
     id=<%= "build_status#{index}" %> onchange="this.form.submit()"> 
       <option value="PENDING">PENDING</option> 
       <option value="PASS" selected="selected">PASS</option 
       <option value="FAIL">FAIL</option> 
     </select> 
    </form> 

Answer 3

<form id=<%= "build_status_form#{index}" %>> 
      <select name="condition" 
      id=<%= "build_status#{index}" %> onchange="this.form.submit()"> 

        if(your value is true) 
        { 
         if value is pending then 
         <option selected="selected" value="PENDING">PENDING</option> 
         else 
         <option value="PENDING">PENDING</option> 

         like this you can write 
        } 
      </select> 
     </form> 

我喜欢这里javascript.You写，你在ralis需要可以写这个假设。