Jsp judges the List Length

Jsp judges the List Length

Hello everyone:

One problem encountered today is that the back-end uploads a List to the front-end and the front-end judges the List length!

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In jsp development, it is often necessary to determine the length of the list or string to do something. Because if in the jstl label does not support else, select while. <% @ Taglib prefix = "c" uri = "http://java.sun.com/jsp/jstl/core" %> <% @ taglib uri = "http://java.sun.com/jsp/jstl/functions" prefix = "fn" %> -------- standard is required here. the jar package introduces two tag libraries to determine the length, for example, Jsp code
           
  
   
Not grouped
            
            
   
    
$ {Tags. tagname}
             
        
   

What I want to talk about today is just the tag <% @ taglib prefix = "c" uri = "http://java.sun.com/jsp/jstl/core" %>.

You only need to add an implicit tag to the body to easily determine

So OK !!!

     
 
 
            
  
  
 
   Traditional Chinese medicine: 
  
                 
  
  
    
  
 
 

              
$ {TcMedicineList. name }$ {tcMedicineList. standard}
                          
    
            
            
   
Dose: $ {ptcMedicineList. num }$ {ptcMedicineList. unit}
<% -- Dose: $ {ptcMedicineList. dosage}
-- %> Usage: $ {ptcMedicineList. usemethod }$ {ptcMedicineList. dosage}
        
             
                     
  
             
  
   
>
             
   
Dose: $ {ptcMedicineList. num }$ {ptcMedicineList. unit}
Usage: $ {ptcMedicineList. usemethod }$ {ptcMedicineList. dosage} expand
        
          
                                 
 
 
        
              
   
  
$ {TcMedicineList. name }$ {tcMedicineList. standard}
           
         
  
             
   
  
Dose: $ {ptcMedicineList. num }$ {ptcMedicineList. unit}
Usage: $ {ptcMedicineList. usemethod }$ {ptcMedicineList. dosage} collapse
          
          
 
 
               
 
 

  
  Western medicines:
 
 
                 
 
 
        
          
   
  
$ {WeMedicineList. name }$ {weMedicineList. standard}
       
         
              
   
  
... Expand
       
          
 
 
                        
 
 
          
              
   
  
$ {WeMedicineList. name }$ {weMedicineList. standard}
            
             
  
  
Collapse
        
 
 
<% --
 
 
 
  
  Check items:
 
 
         
 
 
        
          
   
  
$ {Entity. name}
       
              
  
  
Expand
        
 
 
        
 
 
          
              
   
  
$ {Entity. name}
            
             
  
  
Collapse
        
 
 
-- %>
 
 

  
  Others:
 
 
      
 
 
      
           
   
  
$ {OtMedicineList. name }$ {otMedicineList. standard}
      
        
 
 
      
 
 

  
  Treatment items:
 
 
      
       
  
 

   
  
$ {TrMedicineList. name }$ {trMedicineList. standard}
  
 
      
          
 
 

  
  
Total: $ {RMB} yuan