> ## Documentation Index
> Fetch the complete documentation index at: https://help.dingtalk.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Form Use Cases

> A curated list of available form case documents, covering configuration guides for serial number filling, data View Permission settings, assigning subform values to the main Form, and more.

Click a case name below to jump to its detailed configuration instructions:

1. Filling serial numbers in a form
2. Only allow viewing your own data in a form
3. Getting subform values in a form and assigning them to the current main form
4. Data linkage triggered by code assignment or default option in a form
5. Getting data source in a form and displaying it in a subform
6. Getting data source in a form and assigning it to a dropdown select component
7. Assigning the retrieved data source to the dropdown select option values of a subform in a form
8. Incrementing the serial number component by one when adding a new item to a subform in a form
9. Accumulating quantities when entering the same product in a purchase form
10. Employee information collection data statistics in a form
11. Activity type selection for the address component in a form
12. Converting numerical values to English in a form
13. Image upload and compression in a form
14. Image cropping before upload in a form / custom page
15. URL parameter backfill in a form / custom page
16. Custom rendering of details page fields in a form
17. Filling a subform with another subform in a form
18. Randomly picking questions in a form
19. Filling a subform via dropdown multiselect in a form
20. Calculating scores for multiselect questions in a form
21. Custom attachment upload address in a form
22. Subform repeat validation in a form
23. Filling a subform via associated form multiselect in a form
24. Bank card number formatting and validation in a form
25. Code assignment triggering formula editing that quotes the component in a form
26. Initiating a sub-process from a subform in a form
27. Image paste upload in a form
28. Implementing association options after a select associates with data from another form in a form
29. Scan code recognition in a form
30. Subform batch import to implement data linkage in a form
31. Configuring form data source for a cascade component in a form
32. Real-time uniqueness validation of components in a form
33. Setting the default value for an associated form in a form (first item selected by default)
34. Implementing custom validation in a form
35. Implementing a custom date selectable range in a form
36. Converting Gregorian date to lunar date in a form
37. Common subform scenarios in a form
38. Implementing batch inbound and outbound in inventory management in a form
39. Calculating workdays in a form
40. Sending message notifications to employees selected via the subform member component
41. Two component values controlling the state of another component
42. Getting latitude and longitude via a location component
43. Preventing re-submission within two months
44. How to restrict the form submission time range
45. How to implement the one-item-one-code feature
46. How to print QR codes for one-item-one-code

More cases: Use Cases