Question Types

Single Line question type

About the "Single Line" question type

With the "Single Line" question type you can capture free-form entries in the questionnaire — either as plain text or in a more specific format such as numbers, phone numbers, email addresses or regular patterns (regex). This question type is especially suited to compact entries such as:

names, places or phone numbers
short open-ended answers (e.g. "What is your favorite dish?")
codes, ID numbers or other structured data

It's very flexible to use and also offers many configuration options for input validation and display.

Settings for the Single Line question type

For the "Single Line" question type, the following settings are available:

Settings for the Single Choice question type

Input Size
Choose the desired width of the input field to match the layout of your questionnaire:
- Narrow – about 1/4 of the questionnaire width
- Medium – about 1/2 of the width
- Wide – full width of the questionnaire
Note: On smartphones in portrait mode the field is automatically shown at full width — regardless of the selected setting.
Field Prefix and Field Postfix
Optionally, you can add extra text before or after the input field — e.g. units of measurement, symbols or hints.
- Prefix: "approx.", "+49", "from"
- Postfix: "minutes", "%", "€", "kg"
"Not applicable" option
This option adds an extra "Not applicable" choice next to the input field.
Recommended use:
Useful for required questions where respondents can still choose not to answer — e.g.:
- for sensitive or personal topics (e.g. income, age)
- when no information is available (e.g. "What is your current electricity consumption?")
This gives respondents a fair way out without resorting to imprecise or incorrect entries.
Value types (input types) for validation:
Using the drop-down menu you can define the input type — this ensures that the entry follows specific format rules:
- Text – Free entry with no restrictions (default)
- Number – Only numeric entry allowed
- Phone Number – Entry of a valid phone number
- Password – Entry is masked, e.g. for login fields
- Date (Calendar) – Selection via calendar widget
- Time – Time entry via time widget
- Web address(URL) – e.g. https://www.example.com
- Email address – e.g. name@mail.de
- Card Number – Digits only; all other characters are removed automatically
- Pattern (Regex) – Custom validation with regular expressions
  Examples:
  ^[A-Z]{2}\d{6}$ → Two uppercase letters followed by six digits
  ^[A-ZÄÖÜ]{1,3}-[A-Z]{1,2} \d{1,4}E?$ → German license plates with an optional E at the end
Input Field Settings

Input Field Settings

Initial value
Here you can define a value that already appears in the input field when the page loads.
This is especially useful when already known information should be filled in automatically — e.g.:
- from contact lists
- URL parameters
- through piping from an earlier answer
  👉 See also: Reuse answers with piping
Highlight element
When this option is enabled, the input field is visually highlighted (e.g. with a colored background marker).
Useful, for example, for particularly important or central fields.
Placeholder text
A gray hint text that appears in the input field while it is empty — e.g.:
- "Please enter your postal code"
- "Format: DD.MM.YYYY"
Important: The placeholder text is for guidance only. It is not saved and disappears as soon as the respondent starts typing.
Field Prefix / Field Postfix
Optional text shown directly before (prefix) or after (postfix) the input field — e.g. "approx.", units of measurement like "kg", "€", "minutes" or symbols like "#". This lets you give entries context and avoid misunderstandings.
Enable custom text field (e.g. "other")
Adds an extra free-text field — e.g. when the main question should be supplemented by an open-ended entry.
Example:
"How many hours did you work last month?"
- Main field: Number
- Free-text field: unit (e.g. hours / days)
Answer to "other" required
When enabled, the additional text field must be filled in once it has been shown.
- Enabled (default): mandatory entry
- Disabled: the text field may be left empty even when it is shown
Text field placeholder
A separate placeholder specifically for the optional free-text field — helpful for clarifying the purpose or expected format of the entry, e.g.: "e.g. minutes", "please explain in more detail".
Here too: the text is only a hint and is not saved.

Additional options depending on the input type:

Depending on the selected value type, further specific settings are available in the properties dialog:

Number:
- Minimum Allowed Value: Lower limit for the entry (e.g. "0" for no negative values)
- Maximum Allowed Value: Upper limit for the entry (e.g. "100" for percentages)
- Number of Decimals: Defines how many decimal places are allowed (e.g. "2" for monetary amounts)
Password:
- Minimum Password Length: Sets how many characters the password must have at minimum (e.g. "8" for secure entries)
Date:
- Date Format: By default the format is automatically adapted to the interface language (e.g. "dd.mm.yyyy" for German). Alternatively, you can force the format:
  - dd.mm.yyyy
  - mm/dd/yyyy
  - dd/mm/yyyy
- Default Date Value: A start date that already appears in the field when the survey loads — e.g. a fixed date like 01.01.2025
- From Date / To Date: Allows only entries within a specific period (e.g. for bookings, applications, validity ranges)
Time:
- Initial Value: A time that is already pre-filled — e.g. 08:00 for a default time
Regex:
- Input Pattern (regexp): Enables flexible validation with regular expressions — e.g.:
  - Postal code (5 digits): ^\d{5}$
  - IBAN (simplified check): ^[A-Z]{2}\d{2}[A-Z\d]{1,30}$
  - German license plates: ^[A-ZÄÖÜ]{1,3}-[A-Z]{1,2} \d{1,4}E?$