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Steps

Screens (Click to view)

Start the Joget Server and open the App Center.
Log in as admin and click on the Design New App button. (see Figure 1)
Fill up the App Details as follows and click Save (see Figure 2):
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
Click on Save and you will be directed to the Form Builder.
Drag and drop a Text Field element on to the canvas.
Hover the mouse over the Text Field element on the canvas and click on Edit to open up the Edit Text Field properties.
Fill up the Edit Text Field properties as follows and click on OK (see Figure 4):
Click on Save on the Form Builder.
Click on Generate App, select Generate CRUD and click OK (see Figure 5)
Once the App Generator is complete, click on the link to launch the userview.
Click on New button and Save at least 2 records of data (see Figure 5)
Head back to the Design App.
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
Click on Save and you will be directed to the Form Builder.
Drag and drop a Select Box element on to the canvas.
Hover the mouse over the Select Box element on the canvas and click on Edit to open up the Edit Select Box properties.
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
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
Drag and drop an AJAX Subform element on to the canvas.
Hover the mouse over the AJAX Subform element on the canvas and click on Edit to open up the Edit AJAX Subform properties.
Fill up the Edit AJAX Subform properties as follows and click on Next (see Figure 8):
1. Form: Form A
Tick the first three checkboxes and click Next (see Figure 8)
Fill up the Edit AJAX Subform properties as follows and click on OK (see Figure 8):
1. Parent Field to keep Subform ID: field1
Click on Preview and select between the records in the Select Box to see the Subform dynamically loads the appropriate record.