Calendar: Use Cases
Selected date
The selectedDate is the date which is currently marked as selected.
You usually select a date by clicking on it with the mouse or hitting Enter on the keyboard.
The selectedDate might not be within the dates in the current month view.
export const selectedDate = () => html`
<style>
.demo-calendar {
border: 1px solid #adadad;
box-shadow: 0 0 16px #ccc;
max-width: 500px;
}
</style>
<lion-calendar class="demo-calendar" .selectedDate=${new Date(1988, 2, 5)}></lion-calendar>
`;
Central Date
The centralDate defines which day will be focused when keyboard moves the focus to the current month grid.
By default it is set to today, or the enabled day of the current month view that is closest to today's date.
The next and previous months' buttons work by changing the centralDate with plus or minus one month.
Changing the centralDate may mean a different view will be displayed to your users if it is in a different month.
Usually if you change only the day, "nothing" happens as it's already currently in view.
The centralDate can be different from selectedDate as you can have today as actively selected but still look at date that is years ago.
When the selectedDate changes, it will sync its value to the centralDate.
export const centralDate = () => {
const today = new Date();
const centralDate = new Date(today.getFullYear(), today.getMonth() + 1, today.getDate());
return html`
<style>
.demo-calendar {
border: 1px solid #adadad;
box-shadow: 0 0 16px #ccc;
max-width: 500px;
}
</style>
<lion-calendar class="demo-calendar" .centralDate="${centralDate}"></lion-calendar>
`;
};
Controlling focus
You can control the focus by calling the following methods
focusCentralDate()focusSelectedDate()focusDate(dateInstanceToFocus)
Be aware that the central date changes when a new date is focused.
export const controllingFocus = () => {
const today = new Date();
const selectedDate = new Date(today.getFullYear(), today.getMonth(), today.getDate() + 1);
const centralDate = new Date(today.getFullYear(), today.getMonth(), today.getDate() - 5);
return html`
<style>
.demo-calendar {
border: 1px solid #adadad;
box-shadow: 0 0 16px #ccc;
max-width: 500px;
}
</style>
<lion-calendar
id="js-demo-calendar"
class="demo-calendar"
.selectedDate="${selectedDate}"
.centralDate="${centralDate}"
></lion-calendar>
<button
@click="${e => e.target.parentElement.querySelector('#js-demo-calendar').focusCentralDate()}"
>
Set focus on: Central date
</button>
<button
@click="${e => e.target.parentElement.querySelector('#js-demo-calendar').focusSelectedDate()}"
>
Set focus on: Selected date
</button>
<button
@click="${e => e.target.parentElement.querySelector('#js-demo-calendar').focusDate(today)}"
>
Set focus on: Today
</button>
`;
};
Limiting selectable values
Providing a lower limit
To give a lower limit you can bind a date to the minDate property.
export const providingLowerLimit = () => {
const minDate = new Date();
return html`
<style>
.demo-calendar {
border: 1px solid #adadad;
box-shadow: 0 0 16px #ccc;
max-width: 500px;
}
</style>
<lion-calendar class="demo-calendar" .minDate="${minDate}"></lion-calendar>
`;
};
Provide a higher limit
To give a higher limit you can bind a date to the maxDate property. In this example, we show how to create an offset of + 2 days.
export const providingHigherLimit = () => {
const today = new Date();
const maxDate = new Date(today.getFullYear(), today.getMonth(), today.getDate() + 2);
return html`
<style>
.demo-calendar {
border: 1px solid #adadad;
box-shadow: 0 0 16px #ccc;
max-width: 500px;
}
</style>
<lion-calendar class="demo-calendar" .maxDate="${maxDate}"></lion-calendar>
`;
};
Provide a list of disabled dates
In some cases a specific date or day of the week needs to be disabled, supply those days to the disableDates property.
export const disabledDates = () => html`
<style>
.demo-calendar {
border: 1px solid #adadad;
box-shadow: 0 0 16px #ccc;
max-width: 500px;
}
</style>
<lion-calendar
class="demo-calendar"
.disableDates=${day => day.getDay() === 6 || day.getDay() === 0}
></lion-calendar>
`;
Combined disable dates
To limit the scope of possible dates further, combine the methods mentioned above.
export const combinedDisabledDates = () => {
const today = new Date();
const maxDate = new Date(today.getFullYear(), today.getMonth() + 2, today.getDate());
return html`
<style>
.demo-calendar {
border: 1px solid #adadad;
box-shadow: 0 0 16px #ccc;
max-width: 500px;
}
</style>
<lion-calendar
class="demo-calendar"
.disableDates=${day => day.getDay() === 6 || day.getDay() === 0}
.minDate="${new Date()}"
.maxDate="${maxDate}"
></lion-calendar>
`;
};
Finding enabled dates
The next available date may be multiple days/month in the future/past. For that we offer convenient helpers as
findNextEnabledDate()findPreviousEnabledDate()findNearestEnabledDate()
export const findingEnabledDates = () => {
function getCalendar(ev) {
return ev.target.parentElement.querySelector('.js-calendar');
}
return html`
<style>
.demo-calendar {
border: 1px solid #adadad;
box-shadow: 0 0 16px #ccc;
max-width: 500px;
}
</style>
<lion-calendar
class="demo-calendar js-calendar"
.disableDates=${day => day.getDay() === 6 || day.getDay() === 0}
></lion-calendar>
<button @click="${ev => getCalendar(ev).focusDate(getCalendar(ev).findNextEnabledDate())}">
focus findNextEnabledDate
</button>
<button @click="${ev => getCalendar(ev).focusDate(getCalendar(ev).findPreviousEnabledDate())}">
focus findPreviousEnabledDate
</button>
<button @click="${ev => getCalendar(ev).focusDate(getCalendar(ev).findNearestEnabledDate())}">
focus findNearestEnabledDate
</button>
`;
};