Date Picker

<gr-date-picker> | GrDatePicker

Date pickers let users pick a single date or a date range using a visual calendar.

The date picker allows you to set a minimum and a maximum allowed date. These settings can be combined or used alone, depending on the need. Please note that the date values must be passed in IS0-8601 format: YYYY-MM-DD, and the end user needs to enter it in this format: DD-MM-YYYY (because almost all PAQT.com products require this).

The following languages are currently supported: en, de, fr, and nl. Let us know if you need support for different languages. The language will be automatically based on the document language specified in the html tag (<html lang="en">) or otherwise the browser language of the user.

This is a wrapper around the accessible Duet Date Picker.

<gr-date-picker label="Date"></gr-date-picker>

Options

Predefined value

Use the value attribute to set a predifined value. Please note that this must be passed in IS0-8601 format: YYYY-MM-DD.

<gr-date-picker label="Choose a date" value="2020-06-16"></gr-date-picker>

Minimum date

Use the min attribute to set the minimum date allowed to be picked. Must be in ISO-8601 format: YYYY-MM-DD. This setting can be used alone or together with the max attribute.

<gr-date-picker label="Choose a date" value="2020-06-16" min="2020-06-10"></gr-date-picker>

Maximum date

Use the max attribute to set the maximum date allowed to be picked. Must be in ISO-8601 format: YYYY-MM-DD. This setting can be used alone or together with the min attribute.

<gr-date-picker label="Choose a date" value="2020-06-16" max="2020-07-18"></gr-date-picker>

Date range

Below is an example how you can implement a date range using the date picker:

<gr-date-picker label="Start date" id="start-date"></gr-date-picker>

<gr-date-picker label="End date" id="end-date"></gr-date-picker>

<script>
// Select the above date picker components
var startPicker = document.querySelector('#start-date');
var endPicker = document.querySelector('#end-date');
var startDate, endDate;

// Handle date selection
function handleDateSelect() {
if (startDate && endDate) {
console.log('date range selected', startDate, endDate);
}
}

// When the start date picker is changed…
startPicker.addEventListener('gr-change', function (e) {
startDate = e.detail.valueAsDate;
endPicker.min = e.detail.value;

handleDateSelect();
});

// When the end date date picker is changed…
endPicker.addEventListener('gr-change', function (e) {
endDate = e.detail.valueAsDate;
startPicker.max = e.detail.value;

handleDateSelect();
});
</script>

Opening the calendar modal progammatically

Use the show() method to show the calendar modal, moving focus to the calendar inside.

You could use this to automatically open the calender when the field receives focus, but this is not recommended due to accessibility concerns.

Show date picker

<gr-date-picker label="Choose a date" id="date-picker-show"></gr-date-picker>

<gr-button id="show-date-picker-button">Show date picker</button>

<script>
const button = document.querySelector("#show-date-picker-button")

button.addEventListener("click", function() {
document.querySelector("#date-picker-show").show()
});
</script>

Control which days are selectable

Use the isDateDisabled() method to disable the selection of specific days. Below is an example of a date picker that is disabling weekends.

Be aware, this only disables selection of dates in the calendar modal. You must still handle the case where a user manually enters a disallowed date into the input.

<gr-date-picker label="Choose a date" id="date-picker-show"></gr-date-picker>

<script>
function isWeekend(date) {
return date.getDay() === 0 || date.getDay() === 6;
}

const pickerDisableWeekend = document.querySelector('#date-picker-disable-weekend');
pickerDisableWeekend.isDateDisabled = isWeekend;
</script>

Placeholders

Use the placeholder attribute to add a placeholder.

The placeholder text, also commonly known as “ghost text,” is temporary and disappears once a user enters text.

Putting instructions for how to complete an input, requirements, or any other essential information into placeholder text is not accessible. Once a value is entered, this text is no longer viewable; if someone is using an automatic form filler, they will never get the information in the placeholder text. Help text is the preferred way to communicate this information.

<gr-date-picker placeholder="Enter a date"></gr-date-picker>

Disabled

Use the disabled attribute to disable a date picker.

<gr-date-picker placeholder="Disabled" disabled></gr-date-picker>

Invalid

The date picker can be marked invalid using the invalid attribute.

<gr-date-picker placeholder="Invalid" invalid></gr-date-picker>

Labels

Use the label attribute to give the date picker an accessible label. For labels that contain HTML, use the label slot instead.

<gr-date-picker label="Date"></gr-date-picker>

Required or optional

Date pickers can be marked as optional or required, depending on the situation. For required date pickers, there are two styling options: a “(required)” label or an asterisk with the required-indicator attribute. If you use an asterisk, be sure to include hint text to explain what the asterisk means. Optional date pickers are either denoted with text added to the end of the label — “(optional)” — or have no indication at all.

The asterisk used in this component is an icon that has specific spacing from the label text — not part of the label text itself.



<gr-date-picker label="Date (required)" value="2022-03-03"></gr-date-picker>
<br />
<gr-date-picker label="Date (optional)" value="2022-03-03"></gr-date-picker>
<br />
<gr-date-picker label="Date" value="2022-03-03" required-indicator></gr-date-picker>

Help Text

Change the descriptive help text of a date picker with the help-text attribute. For help texts that contain HTML, use the help-text slot instead.

Please note that the date picker already has a default help text to denote the required format (dd-mm-yyyy). Be sure to include it, if you decide to override it.

<gr-date-picker
label="Preferred shipping date"
help-text="Format: dd-mm-yyyy. We will try to deliver your package before this date."
>
</gr-date-picker>

Invalid Text

Add descriptive invalid text to a date-picker with the invalid-text attribute. For invalid texts that contain HTML, use the invalid-text slot instead.

When you add the invalid attribute, the invalid text will be shown. When an input already includes help text, the help text is replaced with invalid text.

<gr-date-picker
label="Preferred shipping date"
help-text="Format: dd-mm-yyyy. We will try to deliver your package before this date."
invalid-text="Please enter your preferred shipping date in the format: dd-mm-yyyy."
invalid
>
</gr-date-picker>

Usage guidelines

Use for scheduling, not for memorable dates such as a date of birth

Don't use a date picker to enter a date that is many years in the future or the past.

Use an input when the date is known by the user, such as a date of birth or credit card expiration, or for approximate dates.

Use a date picker when the user needs to know a date’s relation to other days such as the day of the week it falls on or its proximity to today. They are optimal for scheduling tasks.

Include a label

Every date picker should have a label. A field without a label is ambiguous and not accessible.

Follow capitalization rules

Field labels and placeholder text should be in sentence case.

Mark the minority of fields in a form as optional or required

In a single form, mark only the required fields or only the optional fields, depending on whichever is less frequent in the entire form. If most of the fields are optional, only the required fields should be give an asterisk or have labels appended with “(required)”. If most of the fields are required, only the optional fields should be appended with “(optional)”. An asterisk should never be used to note that a field is optional. If you use an asterisk, be sure to include hint text to explain what the asterisk means.

Try to only ask for information that’s required.

For large forms involving sensitive data like checkout processes and long account creation forms, it's better to mark both required fields & optional fields explicitly (required fields with an asterisk, and label appended with “(optional)” for optional fields).

Use help text to show hints, formatting, and requirements

The description in the help text is flexible and encompasses a range of guidance. Sometimes this guidance is about what to input, and sometime it’s about how to input. This includes information such as:

  • An overall description of the input field
  • Hints for what kind of information needs to be input
  • Specific formatting examples or requirements

The help text’s message should not simply restate the same information in the label in order to prompt someone to interact with it. Don’t add help text if it isn’t actually relevant or meaningful to a user in order to try to maintain layout continuity with other inputs that require help text.

Use help text instead of placeholder text

Putting instructions for how to complete an input, requirements, or any other essential information into placeholder text is not accessible, and should be avoided if possible. Once a value is entered, placeholder text is no longer viewable; if someone is using an automatic form filler, they will never get the information in the placeholder text.

Instead of placeholder text, use the help text description to convey requirements or to show any formatting examples that would help user comprehension. If there's placeholder text and help text at the same time, it becomes redundant and distracting, and especially if they're communicating the same thing.

Validation

We recommend validating the users data before form submission. Use visual cues to guide the user as to where the problem lies within the form. This will help to easily identify the elements that need to be corrected.

The validation should appear when the user has clicked away from the date picker (not before), or otherwise when the user submits the form. Once the user corrects the errors within the date picker, the validation should disappear once the data is rendered as valid.

For Vue, we recommend Vuelidate to implement this behavior. See a working example (CodeSandbox).

Of course, you should still validate server-side (if applicable).

Unfortunately, due to how the underlying Duet Date Picker works, the value is not changed when entering an invalid date (and therefore the gr-change event is not fired). So, most of your validation won't fire. Be sure to communicate the required format in the invalid-text when the field is required.

Always write invalid text when invalid

Don't just mark an input invalid and expect the user to understand why it's invalid. Furthermore, the invalid text displays an icon which is needed for accessibility, and gives more attention to the invalid field.

Switch help text with invalid text

The help text area also displays an error message. When a text field already includes help text and it's marked invalid, the help text is replaced with invalid text. Once it's no longer invalid, the help text description reappears below the field.

Since one gets replaced by the other, the language of the help text and invalid text need to work together to convey the same messaging. Help text explains the requirement or adds supplementary context for how to successfully complete the input. Invalid text tells a user how to make it valid by re-stating the input requirements or describing the necessary interaction. Make sure that the help text and the invalid text include the same essential information so that it isn’t lost if one replaces the other (e.g., password requirements).

 

 

Write invalid text that shows a solution

Write error messaging in a human-centered way by guiding a user and showing them a solution — don’t simply state what’s wrong and then leave them guessing as to how to resolve it. Ambiguous error messages can be frustrating and even shame-inducing for users. Also, keep in mind that something that a system may deem an error may not actually be perceived as an error to a user.

Invalid text should be written in 1-2 short, complete sentences and in a clear and straightforward way. End sentences with a period, and never with an exclamation point. For text fields, the nature of the error is often related to something that needs to be fixed for in-line validation, so a helpful tone is most appropriate. For example, if someone were to miss filling out a required field that asks for their email address, write the invalid text like you’re offering a hint or a tip to help guide them to understand what needs to go in the missing field: “Enter your email address.”

Properties

Property Attribute Description Type Default
direction direction Forces the opening direction of the calendar modal to be always left or right. This setting can be useful when the input is smaller than the opening date picker would be as by default the picker always opens towards right. "left" | "right" 'right'
disabled disabled Makes the date picker input component disabled. This prevents users from being able to interact with the input, and conveys its inactive state to assistive technologies. boolean false
firstDayOfWeek first-day-of-week Which day is considered first day of the week? 0 for Sunday, 1 for Monday, etc. Default is Monday. DaysOfWeek.Friday | DaysOfWeek.Monday | DaysOfWeek.Saturday | DaysOfWeek.Sunday | DaysOfWeek.Thursday | DaysOfWeek.Tuesday | DaysOfWeek.Wednesday DaysOfWeek.Monday
helpText help-text The date picker's help text. Alternatively, you can use the help-text slot. string ''
invalid invalid Set to true to indicate this field is invalid. Will display the invalid text instead of the help text boolean false
invalidText invalid-text The date picker's invalid text. Alternatively, you can use the invalid-text slot. string ''
isDateDisabled -- Controls which days are disabled and therefore disallowed. For example, this can be used to disallow selection of weekends. (date: Date) => boolean () => false
label label The date picker's label. Alternatively, you can use the label slot. string ''
max max Maximum date allowed to be picked. Must be in IS0-8601 format: YYYY-MM-DD. This setting can be used alone or together with the min property. string ''
min min Minimum date allowed to be picked. Must be in IS0-8601 format: YYYY-MM-DD. This setting can be used alone or together with the max property. string ''
name name Name of the date picker input. string ''
placeholder placeholder The date picker input's placeholder text. string ''
requiredIndicator required-indicator Set to true to display a required indicator, adds an asterisk to label boolean false
value value Date value. Must be in IS0-8601 format: YYYY-MM-DD. string ''

Events

Event Description Type
gr-blur Emitted when the date picker input loses focus. CustomEvent<void>
gr-change Emitted when a date is selected. CustomEvent<{ component: "gr-date-picker"; valueAsDate: Date; value: string; }>
gr-close Emitted when the panel closes. CustomEvent<void>
gr-focus Emitted when the date picker input gains focus. CustomEvent<void>
gr-open Emitted when the panel opens. CustomEvent<void>

Methods

hide(moveFocusToButton?: boolean) => Promise<void>

Hide the calendar modal. Set moveFocusToButton to false to prevent focus returning to the date picker's button. Default is true.

Returns

Type: Promise<void>

setFocus() => Promise<void>

Sets focus on the date picker's input. Use this method instead of the global focus().

Returns

Type: Promise<void>

show() => Promise<void>

Show the calendar modal, moving focus to the calendar inside.

Returns

Type: Promise<void>

CSS Custom Properties

Name Description
--backdrop-color Background color of the backdrop (used on small viewports)
--button-background-color Background color of the calendar button
--button-color Text color of the calendar button
--focus-border-color The border color to use when controls receives focus.
--focus-ring The focus ring style to use when controls receives focus, a box-shadow property.
--input-background-color Background color of the input
--input-background-color-invalid Background color of the input when invalid
--input-border-color Border color of the input
--input-border-color-hover Border color of the input on hover
--input-border-color-invalid Border color of the input when invalid
--input-border-color-invalid-hover Border color of the input when invalid on hover
--input-color Text color of the input
--min-height Minimum height of the input
--panel-background-color Background color of the panel
--panel-border-color Border color of the panel
--panel-border-radius Border radius of the panel
--panel-box-shadow Box shadow of the panel
--placeholder-color Text color of the placeholder
--selected-day-background-color Background color of the selected day indicator
--selected-day-color Text color of the selected day indicator