Limit the number of options displayed in the dropdown or list of shared form. This is useful when you have a large number of options & want to limit the number of options displayed in the dropdown or list for the user to select from.
- Use `Hide` button next to the option to hide the option from the dropdown or list.
- Use `Reorder` button associated with a field to reorder the options.
Field validations are only available in the cloud version of NocoDB.
:::
NocoDB allows you to configure input data validations for fields in the form. To configure field validation, click on the required field in the **Form Area**, and in the right configuration panel, configure the desired validations. Supported validations are type-specific and are listed below.
:::info
- Validation rules for fields are only applied when input fields are not empty. Set *Required* to enforce these validation rules and ensure that the field cannot be left blank.
- Validation rules for fields are only applied when input fields are not empty. Set *Required field* to enforce these validation rules and ensure that the field cannot be left blank.
- The form cannot be submitted if the validation rules are not met.
- Utilize help text to offer additional information about the field and its associated validation rules.
:::
#### Text-based Field Types
For text-based field types (`Single Line Text`, `Email`, `Phone`, `URL`, `Long Text`, `Rich Text`), you can configure the following validations:
- **Minimum Length**: Specifies the minimum number of characters required for the field.
- **Maximum Length**: Specifies the maximum number of characters allowed for the field.
- **Pattern**: Allows you to define a regular expression pattern that the field value must match.
### Text-based Field Types
#### Numeric Field Types
- **Required**: Ensures that the field cannot be left blank.
- **Min Value**: Specifies the minimum numeric value allowed for the field.
- **Max Value**: Specifies the maximum numeric value allowed for the field.
For text-based field types `Single Line Text``Email``Phone number``URL``Long Text``Rich Text`, you can configure the following validations:
- **Minimum characters**: Specifies the minimum number of characters required for the field.
- **Maximum characters**: Specifies the maximum number of characters allowed for the field.
- **Starts with**: Allows you to define a prefix that the field value must start with.
- **Ends with**: Allows you to define a suffix that the field value must end with.
- **Contains string**: Allows you to define a substring that the field value must contain.
- **Does not contain string**: Allows you to define a substring that the field value must not contain.
- **Regular Expression**: Allows you to define a regular expression pattern that the field value must match.
#### Select-based Field Types
- **Required**: Ensures that at least one option is selected.
For Email field type, you can configure the following additional validations:
- **Validate email**: Ensures that the field value is a valid email address.
- **Accept only work email**: Ensures that the field value is a valid work email address.
### Field Type Specific Settings
For select based field types (`Single-Select`, `Multi-Select`, `User`), you can configure the following additional settings:
For Phone number field type, you can configure the following additional validations:
- **Validate phone number**: Ensures that the field value is a valid phone number.
#### Limit Options
Limit the number of options displayed in the dropdown or list of shared form. This is useful when you have a large number of options & want to limit the number of options displayed in the dropdown or list for the user to select from.
- Use `Hide` button next to the option to hide the option from the dropdown or list.
- Use `Reorder` button associated with a field to reorder the options.
For URL field type, you can configure the following additional validations:
- **Validate URL**: Ensures that the field value is a valid URL.
### Numeric Field Types
For numeric field types `Number``Currency``Percentage``Decimal``Duration`, you can configure the following validations:
- **Minimum**: Specifies the minimum numeric value allowed for the field.
- **Maximum**: Specifies the maximum numeric value allowed for the field.
:::info
- Value configured can be an integer or a decimal number, positive or negative.
- Maximum value should be greater than or equal to the minimum value.
- Value can be left empty to disable the validation.
:::
-----
**Configuration Steps**
1. Click on the required field in the **Form Area**.
2. In the right configuration panel, click on the toggle button next to `Limit number to a range`
3. [Optional] Configure the minimum value allowed for the field.
4. [Optional] Configure the maximum value allowed for the field.
### Date-based Field Types
For date-based field types `Date``Date & Time``Time``Year`, you can configure the following validations:
- **Minimum**: Specifies the minimum allowed value for the field.
- **Maximum**: Specifies the maximum allowed value for the field.
:::info
- For both, date & date-time fields, only the date part is considered for validation.
- Value can be left empty to disable the validation.
:::
-----
**Configuration Steps**
1. Click on the required field in the **Form Area**.
2. In the right configuration panel, click on the toggle button next to `Limit date to a range`
3. [Optional] Configure the minimum value allowed for the field.
4. [Optional] Configure the maximum value allowed for the field.
### Attachment Field Type
For the attachment field type, you can configure the following validations:
- **Limit file types**: Allows you to restrict the file types that can be uploaded by specifying permitted MIME types.
Example
- `image/png` Allows PNG images only
- `application/pdf` Allows PDF documents only
- `image/*` Allows all images
- **Limit file size**: Specifies the maximum file size allowed for the attachment. Size can be either in KB or MB.
- **Limit number of files**: Specifies the maximum number of files that can be uploaded.
:::info
- MIME types should be separated by a comma. Find MIME types for different file formats [here](https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types/Common_types).
- File size limit specified is the maximum size allowed for each file, not the total size of all files.
:::
-----
**Configuration Steps**
1. Click on the required field in the **Form Area**.
2. `Limit file types` Enter the permitted MIME types separated by a comma.
3. `Limit number of files` Enter the maximum number of files that can be uploaded.
4. `Limit file size` Enter the maximum file size allowed for the attachment.
## Prefill Form Fields
Here's a more professional rephrasing of the given content:
Raju Udava
6 months ago
