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Form fields and values

Every form (and form template) contains an ordered list of fields of various types. Field type defines how user input elements will look like, and how user input will be validated.

Every field has a set of common parameters, which are the same for all field types, and type-specific parameters, which define specific style and validation constraints. Both common and type-specific parameters contained as fields in the JSON object.

Field values for submitted form stored separately as JSON objects. The contents of value JSON objects are entirely field type-specific.

common field parameters:
{
   "id": "Text-1",
   "label": "Name",
   "description": "Your full name",
   "required": true,
   "type": "text"
}
  • id - arbitrary alphanumeric string (1 to 19 characters). Unique across current form's fields, used to link with values and its "parent" in template form.
  • label - string. User-defined label, shown as field header, 1 to 100 printable characters.
  • description - string. Field description, shown in smaller text under the header, 1 to 512 printable characters.
  • required - boolean. If true, form cannot be submitted without filling this field with valid value.
  • type - string. Determines field type.

Text field

type: text.

Multiline auto-expanding text field.

Note 1: when value contains empty string, it's considered empty, and thus valid when required: false, min_length != 0.
Note 2: combination required: true, min_length: 0 is not allowed.

type-specific parameters:

{
    "min_length": 5,
    "max_length": 255
}
  • min_length - int. Minimum allowed length, from 0 to 1024.
  • max_length - int. Maximum allowed length 1 to 1024.

value object:

{
    "type": "text",
    "value": "text field value"
}
  • value - string. What was entered the text field.

Checkbox group

type: checkbox_group.

Group of checkboxes.

Note 1: when zero checkboxes selected, values considered empty, and thus valid when required: false, min_checked != 0.
Note 2: combination required: true, min_checked: 0 is not allowed.

type-specific parameters:
{
    "min_checked": 0,
    "max_checked": 3,
    "group": [{
           "label" : "I agree to TOS"
    }]
}
  • min_checked - int. Minimum allowed checked positions, 0 to "group".size - 1.
  • max_checked - int. Maximum allowed checked positions, 1 to "group".size - 1.
value object:
{
    "type": "checkbox_group",
    "values": [true]
}
  • values - array of boolean. They are in the same order as fields in group.

type: dropdown.

Dropdown menu for choosing one option.

type-specific parameters:
{
    "options": [
        {
           "label" : "John"
        },
        {
           "label" : "Alice"
        }
    ]
}
value object:
{
    "type": "dropdown",
    "value_index": 1
}
  • value_index - int. Zero-based index of value from "options".

Radio button group

type: radio_group.

A group of radio buttons. Only one option is selectable.

type-specific parameters:
{
    "options": [
        {
           "label" : "John"
        },
        {
           "label" : "Alice"
        }
    ]
}
value object:
{
    "type": "radio_group",
    "value_index": 1
}  
  • value_index - int. Zero-based index of value from "options".

Date picker

type: date.

A date picker.

type-specific parameters:
{
    "disable_future": false,
    "disable_past": true
}
  • disable_future - boolean. If true, date from the future cannot be selected.
  • disable_past - boolean. If true, date from the past cannot be selected.
value object:
{
    "type": "date",
    "value": "2017-03-14"
}

Rating

type: rating.

Rating with "stars". Zero stars not allowed.

type-specific parameters:
{
  "max_stars": 5
}
  • max_stars - int. Max number of stars to select from.
value object:
{
    "type": "rating",
    "value": 3
}
  • value - int. Number of stars selected. Cannot be more than max_stars.

File

type: file.

File attachment. For example, document or spreadsheet.

type-specific parameters:
{
    "max_file_size": 65536,
    "min_file_size": 128,
    "allowed_extensions": ["xls", "doc"]
}
  • max_file_size - int. Max file size, bytes, no more than 16 Mb.
  • min_file_size - int. Minimum file size, bytes.
  • allowed_extensions - enum array. List of allowed file extensions, up to 16 items, cannot be empty, but can be null, which means "no extension limits".
value object:
{
    "type": "file",
    "file_ids": [3345345]
}
  • file_ids - int array. Ids of the file which should be attached to this form field as value. Files must be uploaded before form submission.

Photo

type: photo.

Photograph attachment.

type-specific parameters:
{
  "max_files": 2
}
  • max_files - int. Maximum number of photos to attach, up to 6.
value object:
{
    "type": "photo",
    "file_ids": [3345345, 534534534]
}
  • file_ids - int array. Ids of the files which should be attached to this form field as value. Files must be uploaded before form submission. Only image files allowed.

Signature

type: signature.

A small image of customer's signature (usually obtained via writing on screen with a stylus).

type-specific parameters:
  • there are no type-specific parameters.
value object:
{
    "type": "file",
    "file_id": 3345345
}
  • file_id - int. An id of the file which should be attached to this form field as value. File must be uploaded before form submission.

Separator

type: separator.

Cosmetic, just to show header. Doesn't contain any actual value. Always filled and valid. Cannot be required.


Last update: May 27, 2021