为什么simple_form视图中的复选框在rails 3.2中被选中或取消选中时总是返回1？

Question

A checkbox (need_delivery) is used to dictate if next 2 text boxes are showing or not. Those 2 text boxes are wrapped in div with id task_request_delivery . Here is the code in simple_form view task_request :

  <%= f.input :need_delivery, :label => 'Need Delivery：', :as => :boolean %>

  <div id="task_request_delivery">
  <%= f.input :what_to_deliver, :label => 'Content:', :input_html => {:rows => 4} %>
  <%= f.input :delivery_instruction, :label => 'Instruction:', :input_html => {:rows => 4} %>
  </div>

The corresponding js code under javascript is:

$(function(){
   $("#task_request_need_delivery").change(function() {
     var rpt = $('#task_request_need_delivery').val();
     alert(rpt);
     if ( rpt == 1 || rpt == 'true' || rpt == '1') {
        $("#task_request_delivery").show(); 
     } else {
        $("#task_request_delivery").hide(); 
     }
   }); 
}); 

The alert(rpt) is inserted to display the value of rpt . Here is what we found:

1. the value of rpt is always 1 when checking or unchecking the checkbox.
2. if ( rpt == 1 || rpt == 'true' || rpt == '1') always returns false

After checking the box initially, the 2 text boxes get hidden. After that, unchecking or checking the box did not change anything on the view (2 text boxes still hidden). Also the rpt is always 1 and if ( rpt == 1 || rpt == 'true' || rpt == '1') is always evaluated as false and this is contradictory ( rpt is 1 and then, if should be true). What's wrong with the code above? Thanks for the help.

Answer 1

我认为你应该使用.is(':checked')方法来确保你的复选框是否被选中。