如何在列表中多次检入GSP Grails

Question

I would like to do a check in a GSP page. I have a list of products. the list contains about 21 products. I use g:each to loop the products in GSP and if/else for the check. see my code below. but if the product.id not eaqual to 3. The page displays/prints the checkBox "dontCallMe" 21 times and I expect to print it one time. why is that? is there other way to do the check? thanks

     <g:each in="${products}" var = "product">
                        <g:if test="${product.id == '3'}">
                            <tr>
                            <td>
                             <g:checkBox name="callMe" checked="true"
                                                value=""/>&nbsp; Call me
                            </td>
                            </tr>
                        </g:if>
                       <g:else>            
                           <tr>
                               <td>
                                   <g:checkBox name="callMe" checked="false"
                                                value=""/>&nbsp; Call me
                               </td>
                           </tr>
                       </g:else>
     <g:if test="${product.id == '4'}">
                            <tr>
                            <td>
                             <g:checkBox name="callMeAgain" checked="true"
                                                value=""/>&nbsp; Call me again
                            </td>
                            </tr>
                        </g:if>
                       <g:else>            
                           <tr>
                               <td>
                                   <g:checkBox name="callMeAgain" checked="false"
                                                value=""/>&nbsp; Call me again
                               </td>
                           </tr>
                       </g:else>
 <g:if test="${product.id == '5'}">
                            <tr>
                            <td>
                             <g:checkBox name="dontCallMeAgain" checked="true"
                                                value=""/>&nbsp; Dont call me again
                            </td>
                            </tr>
                        </g:if>
                       <g:else>            
                           <tr>
                               <td>
                                   <g:checkBox name="dontCallMeAgain" checked="false"
                                                value=""/>&nbsp; Dont call me again
                               </td>
                           </tr>
                       </g:else>
                   </g:each>

Answer 1

If you have 21 products and the dontCallMe appears 21 times it means your condition is always false. What I would do is open up the code in the debugger and verify that the object has the expected value and type that you expect.

If your not using a debugger, add a new <td>

<td>
`${product.id}`
</td>

Also, if you don't have a debugger try something like this (havn't tried it myself):

<td>
`${product.id?.getClass()}`
</td>

Simplification with Debug Code

Finally, the code could be simplified as follows (please excuse typos):

<g:each in="${products}" var = "product">
    <tr>
         <td>
             <g:checkBox name="${product.id == '3' ? 'CallMe' : 'DontCallMe'}" 
             checked="${product.id == '3' ? 'true' : 'false'}"
             value=""/>${product.id == '3' ? 'CallMe' : 'DontCallMe'}"
         </td>
         <td>
              DEBUG: ${product.id} <br/>
              DEBUG: ${product.id?.getClass()} <br/>
         </td>
    </tr>
</g:each>