Datetime input

Create datetime inputs in your forms.

Datetime input

Use the datetimeInput() function to create datetime inputs in your forms. It uses the HTML <input type="datetime-local"> element which provides a built-in datetime picker.

---

Basic usage

import { Composer } from "formsmd";

const composer = new Composer({
  id: "my-form"
});

composer.datetimeInput("appointment", {
  question: "When would you like to schedule your appointment?"
});

Generates the following Markdown-like syntax:

#! id = my-form

appointment = DatetimeInput(
  | question = When would you like to schedule your appointment?
)

Required

Add the required parameter to make the field mandatory:

composer.datetimeInput("appointment", {
  question: "When would you like to schedule your appointment?",
  required: true
});

Generates the following Markdown-like syntax:

appointment* = DatetimeInput(
  | question = When would you like to schedule your appointment?
)

---

Function overview

The following is the overview of the function:

datetimeInput(name: string, params: object)

Arguments

Name	Type	Description
name	string	A unique name for your form field that you'll use to identify the user's response.*
params	object	An object containing all the configuration parameters for your datetime input field (see the parameters section below for the full list of options).

*Avoid values for the name argument which may be the names of HTML attributes, such as "name", "role", "id", etc. This is because by default, the form's template string is first sanitized using DOMPurify, and these values may be removed to prevent DOM clobbering.

---

Parameters

Shared parameters

These parameters are common to all form fields:

Name	Type	Description
question (required)	string	The main question or label of the form field.
required	true (boolean)	When set, the field becomes required.
description	string	Any extra information that the user may need to fill out the form. Appears right below the question.
fieldSize	"sm"	When set to "sm", the font sizes of the question, description, and answer are made smaller.
labelStyle	"classic"	When set to "classic", the question and description of the form field are made smaller.
subfield	true (boolean)	When set, the question and description of the form field are made smaller. Functionally the same as setting labelStyle to "classic".
disabled	true (boolean)	When set, the input is disabled.
autofocus	true (boolean)	When set, the input will be automatically focused when the parent slide becomes active, or immediately after page load.
id	string	The id attribute of the form field container.
classNames	string[]	The CSS class names of the form field. See the available CSS utility classes.
attrs	Array<{ name: string, value: string }>	Other HTML attributes of the form field. Each attribute has a name and value property.
displayCondition	{ dependencies: string[], condition: string }	Controls when the field is shown. The dependencies lists the fields to watch, and condition is the expression that must be true to show the field. The condition must be a valid Nunjucks expression. See example.

Datetime input specific parameters

Name	Type	Description
placeholder	string	Sets the placeholder attribute of the input.
min	string	Sets the minimum allowed datetime value. Must be in the format "YYYY-MM-DDTHH:mm".
max	string	Sets the maximum allowed datetime value. Must be in the format "YYYY-MM-DDTHH:mm".
step	string	Sets the stepping interval.
value	string	If set, this becomes the default value of the input. Must be in the format "YYYY-MM-DDTHH:mm".

---

Examples

Datetime input with min and max values

composer.datetimeInput("meetingTime", {
  question: "When would you like to schedule the meeting?",
  description: "Please choose a time between 9 AM and 5 PM next week",
  min: "2024-01-15T09:00",
  max: "2024-01-19T17:00",
  required: true
});

Generates the following Markdown-like syntax:

meetingTime* = DatetimeInput(
  | question = When would you like to schedule the meeting?
  | description = Please choose a time between 9 AM and 5 PM next week
  | min = 2024-01-15T09:00
  | max = 2024-01-19T17:00
)

Datetime input with custom step interval

composer.datetimeInput("appointmentTime", {
  question: "Select your preferred appointment time",
  description: "Appointments are available in 30-minute slots",
  step: "1800",
  required: true
});

Generates the following Markdown-like syntax:

appointmentTime* = DatetimeInput(
  | question = Select your preferred appointment time
  | description = Appointments are available in 30-minute slots
  | step = 1800
)

Styled datetime input with custom attributes

Add CSS classes and other HTML attributes using the classNames and attrs parameters. Please note, these class names and attributes are added to the <div> or <fieldset> container that contains the actual input field(s).

composer.datetimeInput("eventDateTime", {
  question: "Event date and time",
  classNames: ["col-6", "xs:col-6"],
  attrs: [
    { name: "style", value: "font-size: 18px;" }
  ]
});

Generates the following Markdown-like syntax:

[.col-6 .xs:col-6 style="font-size: 18px;"]
eventDateTime = DatetimeInput(
  | question = Event date and time
)

Please see the available CSS utility classes.

Conditional display

Conditionally show or hide a datetime input field using the displayCondition parameter. It works as follows:

• dependencies lists the fields to watch.

• condition is the expression that must be true to show the field. This must be a valid Nunjucks expression.

For instance, in the example below, the return flight datetime input will only show up if the user selects a round trip.

composer.choiceInput("tripType", {
  question: "What type of trip would you like to book?",
  required: true,
  choices: ["One way", "Round trip"]
})

composer.datetimeInput("returnFlight", {
  question: "Return flight date and time",
  displayCondition: {
    dependencies: ["tripType"],
    condition: "tripType == 'Round trip'"
  }
});

Generates the following Markdown-like syntax:

tripType* = ChoiceInput(
  | question = What type of trip would you like to book?
  | choices = One way, Round trip
)

::: [{$ tripType $}]
{% if tripType == "Round trip" %}
returnFlight = DatetimeInput(
  | question = Return flight date and time
)
{% endif %}
:::

Notes

• During form submission, the user's local timezone will get added to the end of the datetime input value, for example: 2024-06-01T08:30+06:00.