El select data echo, display only value but not label

The main page

  Click on actions, Put the present VIPGrade ID Transfer the past

  At this time we can see ,select List There's data , But why only show value, It doesn't show label Well ？

 

  Now let's print it out , From the main page id What type is it , Take another look at our list Inside id What type is it

 

  From the console we can see , From the main page id yes String Type of , And we list Of VIPGraded yes Number Type of , See here we know why ;

  We are in data echo Reset us VIPGradeID When , Just convert the type to one

Look at the renderings

  At this point we have seen , When data echo , You can bind the corresponding ID value , And the corresponding Label value ;