1. Start Joget Server and open the App Center.
   
   
2. Log in as admin and click on the Design New App button. (see Figure 1)
   
   
3. Fill up the App Details as follows and click Save (see Figure 2):
   1. App ID: ajaxSubform
   2. App Name: AJAX Subform
   
   
   
4. You will be directed to the Design App. Click on the Create New Form button and fill up the Form Details as follows (see Figure 3):
   
   1. Form ID: formA
   2. Form Name: Form A
   3. Table Name: as_a
   
   
   
5. Click on Save and you will be directed to the  Form Builder.
   
   
6. Drag and drop a Text Field element on to the canvas.
   
   
7. Hover the mouse over the Text Field element on the canvas and click on Edit to open up the Edit Text Field properties.
   
   
8. Fill up the Edit Text Field  properties as follows and click on OK (see Figure 4):
   1. ID: name
   2. Label: Name
9. Click on Save on the Form Builder.
   
   
10. Click on Generate App, select Generate CRUD and click OK (see Figure 5)
    
    
11. Once the App Generator is complete, click on the link to launch the userview userview.
    
    
12. Click on New button and Save at least 2 records of data (see Figure 5)
    
    
13. Head back to the Design App.
    
    
14. Click on the Create New Form button and fill up the Form Details as follows (see Figure 6):
    
    1. ID: formB
    2. Form Name: Form B
    3. Table Name: as_b
    
    
    
15. Click on Save and you will be directed to the  Form Builder. 
    
    
16. Drag and drop a Select Box element on to the canvas.
    
    
17. Hover the mouse over the Select Box  element on Box element on the canvas and click on Edit to open up the Edit Select Box properties.
    
    
18. Fill up the Edit Select Box properties as follows and click on Next (see Figure 7):
    1. Label: Choose record from Form A
    2. Or Choose Options Binder: Default Form Options Binder
    
    
    
19. Fill up the following details in the Edit Select Box and click OK (see Figure 7):
    1. ID: field1
    2. Form: Form A
    3. Label Column: name
    
    
    
20. Drag and drop an AJAX Subform  element on element on to the canvas.
    
    
21. Hover the mouse over the AJAX Subform  element on element on the canvas and click on Edit to open up the Edit AJAX Subform properties.
    
    
22. Fill up the Edit AJAX Subform properties as follows and click on Next (see Figure 8):
    1. Form: Form A
    
    
    
23. Tick the first three checkboxes and click Next (see Figure 8)
    
    
24. Fill up the Edit AJAX Subform properties as follows and click on OK (see Figure 8):
    1. Parent Field to keep Subform ID: field1
    
    
    
25. Click on Preview and select between the records in the Select Box to see the Subform dynamically loads the appropriate record.
    
    

The ID of the field in the SubForm form to store the parent table's primary key.