React Calendar Props

Default Value: undefined

The value of this property will be passed to the accesskey attribute of the HTML element that underlies the UI component.

activeStateEnabled

Specifies whether the UI component changes its visual state as a result of user interaction.

Type:

Default Value: true

The UI component switches to the active state when users press down the primary mouse button. When this property is set to true, the CSS rules for the active state apply. You can change these rules to customize the component.

Use this property when you display the component on a platform whose guidelines include the active state change for UI components.

cellComponent

An alias for the cellTemplate property specified in React. Accepts a custom component. Refer to Using a Custom Component for more information.

cellRender

An alias for the cellTemplate property specified in React. Accepts a rendering function. Refer to Using a Rendering Function for more information.

cellTemplate

Specifies a custom template for calendar cells.

Type:

template

Template Data:

Name	Type	Description
date	Date	A Date object associated with the cell.
text	String	The cell's text.
view	String	The current view's name.

Name

Type

Description

date

A Date object associated with the cell.

text

The cell's text.

view

The current view's name.

Default Name: 'cell'

If a cell is a week number, the date field value is undefined.

dateSerializationFormat

Specifies the date-time value serialization format.

Type:

Default Value: undefined

Date-time serialization involves date-time value conversion into a string format for storage or transmission. To ensure proper format detection, specify this property.

Use LDML patterns to pass custom format strings to this property.

IMPORTANT

dateSerializationFormat does not support all LDML pattern combinations.

For instance, you can specify the following patterns:

"yyyy-MM-dd"
A date.
"yyyy-MM-ddTHH:mm:ss"
Local date and time.
"yyyy-MM-ddTHH:mm:ssZ"
Date and time in UTC.
"yyyy-MM-ddTHH:mm:ssx", "yyyy-MM-ddTHH:mm:ssxx", "yyyy-MM-ddTHH:mm:ssxxx"
Date and time with a timezone.

NOTE

You can use this property only if you do not specify the initial value. dateSerializationFormat is calculated automatically if you pass a value in the initial configuration.
If you specify this property, the value will be a string, not a Date object.
If you use API to change the value, make sure that the value has the same format that you specified in this property.
This property takes effect only if the forceIsoDateParsing field is set to true in the global configuration object.

disabled

Specifies whether the UI component responds to user interaction.

Type:

Default Value: false

disabledDates

Specifies dates that users cannot select.

Type:

Array<Date>

|

Function parameters:

data: DisabledDate

Information about the checked date.

Return Value:

true if the date should be disabled; otherwise false.

Default Value: null

This property accepts an array of dates:

jQuery

index.js

$(function() {
    $("#calendarContainer").dxCalendar({
        // ...
        disabledDates: [ 
            new Date("07/1/2017"),  
            new Date("07/2/2017"), 
            new Date("07/3/2017") 
        ]
    });
});

Angular

app.component.html

app.component.ts

app.module.ts

<dx-calendar ...
    [disabledDates]="disabledDates">
</dx-calendar>

import { Component } from '@angular/core';

@Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
    styleUrls: ['./app.component.css']
})
export class AppComponent {
    disabledDates: Date[] = [ 
        new Date("07/1/2017"),  
        new Date("07/2/2017"), 
        new Date("07/3/2017") 
    ];
}

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';

import { DxCalendarModule } from 'devextreme-angular';

@NgModule({
    declarations: [
        AppComponent
    ],
    imports: [
        BrowserModule,
        DxCalendarModule
    ],
    providers: [ ],
    bootstrap: [AppComponent]
})
export class AppModule { }

Vue

App.vue

<template>
    <DxCalendar ...
        :disabled-dates="disabledDates"
    />
</template>

<script>
import 'devextreme/dist/css/dx.light.css';

import DxCalendar from 'devextreme-vue/calendar';

export default {
    components: {
        DxCalendar
    },
    data() {
        return {
            disabledDates: [ 
                new Date("07/1/2017"),  
                new Date("07/2/2017"), 
                new Date("07/3/2017") 
            ]
        }
    }
}
</script>

React

App.js

import React from 'react';

import 'devextreme/dist/css/dx.light.css';

import Calendar from 'devextreme-react/calendar';

class App extends React.Component {
    constructor() {
        this.disabledDates = [ 
            new Date("07/1/2017"),  
            new Date("07/2/2017"), 
            new Date("07/3/2017") 
        ];
    }
    render() {
        return (
            <Calendar ...
                disabledDates={this.disabledDates} 
            />
        );
    }
}
export default App;

Alternatively, pass a function to disabledDates. This function should define the rules that determine whether the checked date is disabled. A separate set of rules should target every view individually.

jQuery

index.js

$(function() {
    $("#calendarContainer").dxCalendar({
        // ...
        disabledDates: function(args) {
            const dayOfWeek = args.date.getDay();
            const month = args.date.getMonth();
            const isWeekend = args.view === "month" && (dayOfWeek === 0 || dayOfWeek === 6 );
            const isMarch = (args.view === "year" || args.view === "month") && month === 2;

            return isWeekend || isMarch;
        }
    });
});

Angular

app.component.html

app.component.ts

app.module.ts

<dx-calendar ...
    [disabledDates]="disableDates">
</dx-calendar>

import { Component } from '@angular/core';

@Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
    styleUrls: ['./app.component.css']
})
export class AppComponent {
    disableDates(args) {
        const dayOfWeek = args.date.getDay();
        const month = args.date.getMonth();
        const isWeekend = args.view === "month" && (dayOfWeek === 0 || dayOfWeek === 6 );
        const isMarch = (args.view === "year" || args.view === "month") && month === 2;

        return isWeekend || isMarch;
    }
}

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';

import { DxCalendarModule } from 'devextreme-angular';

@NgModule({
    declarations: [
        AppComponent
    ],
    imports: [
        BrowserModule,
        DxCalendarModule
    ],
    providers: [ ],
    bootstrap: [AppComponent]
})
export class AppModule { }

Vue

App.vue

<template>
    <DxCalendar ...
        :disabled-dates="disableDates"
    />
</template>

<script>
import 'devextreme/dist/css/dx.light.css';

import DxCalendar from 'devextreme-vue/calendar';

export default {
    components: {
        DxCalendar
    },
    methods: {
        disableDates(args) {
            const dayOfWeek = args.date.getDay();
            const month = args.date.getMonth();
            const isWeekend = args.view === "month" && (dayOfWeek === 0 || dayOfWeek === 6 );
            const isMarch = (args.view === "year" || args.view === "month") && month === 2;

            return isWeekend || isMarch;
        }
    }
}
</script>

React

App.js

import React from 'react';

import 'devextreme/dist/css/dx.light.css';

import Calendar from 'devextreme-react/calendar';

class App extends React.Component {
    disableDates(args) {
        const dayOfWeek = args.date.getDay();
        const month = args.date.getMonth();
        const isWeekend = args.view === "month" && (dayOfWeek === 0 || dayOfWeek === 6 );
        const isMarch = (args.view === "year" || args.view === "month") && month === 2;

        return isWeekend || isMarch;
    }
    render() {
        return (
            <Calendar ...
                disabledDates={this.disableDates} 
            />
        );
    }
}
export default App;

elementAttr

Specifies the global attributes to be attached to the UI component's container element.

Selector: ElementAttr

Type:

Object

Default Value: {}

jQuery

$(function(){
    $("#calendarContainer").dxCalendar({
        // ...
        elementAttr: {
            id: "elementId",
            class: "class-name"
        }
    });
});

Angular

HTML

TypeScript

<dx-calendar ...
    [elementAttr]="{ id: 'elementId', class: 'class-name' }">
</dx-calendar>

import { DxCalendarModule } from "devextreme-angular";
// ...
export class AppComponent {
    // ...
}
@NgModule({
    imports: [
        // ...
        DxCalendarModule
    ],
    // ...
})

Vue

App.vue

<template>
    <DxCalendar ...
        :element-attr="calendarAttributes">
    </DxCalendar>
</template>

<script>
import DxCalendar from 'devextreme-vue/calendar';

export default {
    components: {
        DxCalendar
    },
    data() {
        return {
            calendarAttributes: {
                id: 'elementId',
                class: 'class-name'
            }
        }
    }
}
</script>

React

App.js

import React from 'react';

import Calendar from 'devextreme-react/calendar';

class App extends React.Component {
    calendarAttributes = {
        id: 'elementId',
        class: 'class-name'
    }

    render() {
        return (
            <Calendar ...
                elementAttr={this.calendarAttributes}>
            </Calendar>
        );
    }
}
export default App;

firstDayOfWeek

Specifies the first day of a week.

Type:

FirstDayOfWeek

Default Value: undefined

The property can take on a value from 0 to 6.

0 - Sunday
1 - Monday
2 - Tuesday
3 - Wednesday
4 - Thursday
5 - Friday
6 - Saturday

By default, the value provided by the culture settings is used.

focusStateEnabled

Specifies whether the UI component can be focused using keyboard navigation.

Type:

Default Value: true (desktop)

height

Specifies the UI component's height.

Type:

|

|

Return Value:

|

The UI component's height.

Default Value: undefined

This property accepts a value of one of the following types:

Number
The height in pixels.
String
A CSS-accepted measurement of height. For example, "55px", "20vh", "80%", "inherit".
Function (deprecated since v21.2)
Refer to the W0017 warning description for information on how you can migrate to viewport units.

hint

Specifies text for a hint that appears when a user pauses on the UI component.

Type:

Default Value: undefined

hoverStateEnabled

Specifies whether the UI component changes its state when a user pauses on it.

Type:

Default Value: true

isValid

Specifies or indicates whether the editor's value is valid.

Type:

Default Value: true

NOTE

When you use async rules, isValid is true if the status is "pending" or "valid".

max

The latest date the UI component allows to select.

Type:

|

|

Default Value: new Date(3000, 0)

maxZoomLevel

Specifies the maximum zoom level of the calendar.

Type:

CalendarZoomLevel

Default Value: 'month'

min

The earliest date the UI component allows to select.

Type:

|

|

Default Value: new Date(1000, 0)

minZoomLevel

Specifies the minimum zoom level of the calendar.

Type:

CalendarZoomLevel

Default Value: 'century'

name

The value to be assigned to the name attribute of the underlying HTML element.

Type:

Default Value: ''

Specify this property if the UI component lies within an HTML form that will be submitted.

onDisposing

A function that is executed before the UI component is disposed of.

Type:

Function parameters:

e:

DisposingEvent

Information about the event.

Object structure:

Name	Type	Description
model	any	The model data. Available only if you use Knockout.
element	HTMLElement \| jQuery	The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.
component	Calendar	The UI component's instance.

Name

Type

Description

model

any

The model data. Available only if you use Knockout.

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

Calendar

The UI component's instance.

Default Value: null

onInitialized

A function used in JavaScript frameworks to save the UI component instance.

Type:

Function parameters:

e:

InitializedEvent

Information about the event.

Object structure:

Name	Type	Description
element	HTMLElement \| jQuery	The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.
component	Calendar	The UI component's instance.

Name

Type

Description

element

HTMLElement | jQuery

The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.

component

Calendar

The UI component's instance.

Default Value: null

Angular

app.component.html

app.component.ts

<dx-calendar ...
    (onInitialized)="saveInstance($event)">
</dx-calendar>

import { Component } from "@angular/core";
import Calendar from "devextreme/ui/data_grid";
// ...
export class AppComponent {
    calendarInstance: Calendar;
    saveInstance (e) {
        this.calendarInstance = e.component;
    }
}

Vue

App.vue (Options API)

App.vue (Composition API)

<template>
    <div>
        <DxCalendar ...
            @initialized="saveInstance">
        </DxCalendar>
    </div>
</template>

<script>
import DxCalendar from 'devextreme-vue/calendar';

export default {
    components: {
        DxCalendar
    },
    data: function() {
        return {
            calendarInstance: null
        };
    },
    methods: {
        saveInstance: function(e) {
            this.calendarInstance = e.component;
        }
    }
};
</script>

<template>
    <div>
        <DxCalendar ...
            @initialized="saveInstance">
        </DxCalendar>
    </div>
</template>

<script setup>
import DxCalendar from 'devextreme-vue/calendar';

let calendarInstance = null;

const saveInstance = (e) => {
    calendarInstance = e.component;
}
</script>

React

App.js

import Calendar from 'devextreme-react/calendar';

class App extends React.Component {
    constructor(props) {
        super(props);

        this.saveInstance = this.saveInstance.bind(this);
    }

    saveInstance(e) {
        this.calendarInstance = e.component;
    }

    render() {
        return (
            <div>
                <Calendar onInitialized={this.saveInstance} />
            </div>
        );
    }
}

jQuery

Get a UI component Instance in jQuery

Angular

Get a UI component Instance in Angular

Vue

Get a UI component Instance in Vue

React

Get a UI component Instance in React

onOptionChanged

A function that is executed after a UI component property is changed.

Type:

Function parameters:

e:

OptionChangedEvent

Information about the event.

Object structure:

Name	Type	Description
value	any	The modified property's new value.
previousValue	any	The UI component's previous value.
name	String	The modified property if it belongs to the first level. Otherwise, the first-level property it is nested into.
model	any	Model data. Available only if you use Knockout.
fullName	String	The path to the modified property that includes all parent properties.
element	HTMLElement \| jQuery	The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.
component	Calendar	The UI component's instance.

Default Value: null

The following example shows how to subscribe to component property changes:

jQuery

index.js

$(function() {
    $("#calendarContainer").dxCalendar({
        // ...
        onOptionChanged: function(e) {
            if(e.name === "changedProperty") {
                // handle the property change here
            }
        }
    });
});

Angular

app.component.html

app.component.ts

app.module.ts

<dx-calendar ...
    (onOptionChanged)="handlePropertyChange($event)"> 
</dx-calendar>

import { Component } from '@angular/core'; 

@Component({ 
    selector: 'app-root', 
    templateUrl: './app.component.html', 
    styleUrls: ['./app.component.css'] 
}) 

export class AppComponent { 
    // ...
    handlePropertyChange(e) {
        if(e.name === "changedProperty") { 
            // handle the property change here
        }
    }
}

import { BrowserModule } from '@angular/platform-browser'; 
import { NgModule } from '@angular/core'; 
import { AppComponent } from './app.component'; 
import { DxCalendarModule } from 'devextreme-angular'; 

@NgModule({ 
    declarations: [ 
        AppComponent 
    ], 
    imports: [ 
        BrowserModule, 
        DxCalendarModule 
    ], 
    providers: [ ], 
    bootstrap: [AppComponent] 
}) 

export class AppModule { }

Vue

App.vue

<template> 
    <DxCalendar ...
        @option-changed="handlePropertyChange"
    />            
</template> 

<script>  
import 'devextreme/dist/css/dx.light.css'; 
import DxCalendar from 'devextreme-vue/calendar'; 

export default { 
    components: { 
        DxCalendar
    }, 
    // ...
    methods: { 
        handlePropertyChange: function(e) {
            if(e.name === "changedProperty") {
                // handle the property change here
            }
        }
    } 
} 
</script>

React

App.js

import React from 'react';  
import 'devextreme/dist/css/dx.light.css'; 

import Calendar from 'devextreme-react/calendar'; 

const handlePropertyChange = (e) => {
    if(e.name === "changedProperty") {
        // handle the property change here
    }
}

export default function App() { 
    return ( 
        <Calendar ...
            onOptionChanged={handlePropertyChange}
        />        
    ); 
}

onValueChanged

A function that is executed after the UI component's value is changed.

Type:

Function parameters:

e:

ValueChangedEvent

Information about the event.

Object structure:

Name	Type	Description
value	Object	The UI component's new value.
previousValue	Object	The UI component's previous value.
model	any	Model data. Available only if Knockout is used.
event	Event (jQuery or EventObject)	The event that caused the function to execute. It is an EventObject or a jQuery.Event when you use jQuery. This field is undefined if the value is changed programmatically.
element	HTMLElement \| jQuery	The UI component's container. It is an HTML Element or a jQuery Element when you use jQuery.
component	Calendar	The UI component's instance.

Default Value: null

readOnly

Specifies whether the editor is read-only.

Type:

Default Value: false

rtlEnabled

Switches the UI component to a right-to-left representation.

Type:

DataGrid Demo Navigation UI Demo Editors Demo

Default Value: false

When this property is set to true, the UI component text flows from right to left, and the layout of elements is reversed. To switch the entire application/site to the right-to-left representation, assign true to the rtlEnabled field of the object passed to the DevExpress.config(config) method.

JavaScript

DevExpress.config({
    rtlEnabled: true
});

showTodayButton

Specifies whether or not the UI component displays a button that selects the current date.

Type:

Default Value: false

showWeekNumbers

Specifies whether to display a column with week numbers.

Type:

Default Value: false

tabIndex

Specifies the number of the element when the Tab key is used for navigating.

Type:

Default Value: 0

The value of this property will be passed to the tabindex attribute of the HTML element that underlies the UI component.

validationError

Information on the broken validation rule. Contains the first item from the validationErrors array.

Type: any

Default Value: null

validationErrors

An array of the validation rules that failed.

Type:

Array<any>

Default Value: null

validationMessageMode

Specifies how the message about the validation rules that are not satisfied by this editor's value is displayed.

Type:

ValidationMessageMode

Default Value: 'auto'

The following property values are possible:

auto
The tooltip with the message is displayed when the editor is in focus.
always
The tooltip with the message is not hidden when the editor loses focus.

validationMessagePosition

Specifies the position of a validation message relative to the component. The validation message describes the validation rules that this component's value does not satisfy.

Type:

Position

Default Value: 'bottom'

The following example positions a validation message at the component's right:

jQuery

index.js

$(function() {
    $("#calendarContainer").dxCalendar({
        // ...
        validationMessagePosition: 'right'
    }).dxValidator({
        validationRules: [{
            type: 'required',
            message: 'Required',
        }],
    });
});

Angular

app.component.html

<dx-calendar ...
    validationMessagePosition="right">
    <dx-validator>
        <dxi-validation-rule
            type="required"
            message="Required"
        >
        </dxi-validation-rule>
    </dx-validator>
</dx-calendar>

Vue

App.vue

<template>
    <DxCalendar ...
        validation-message-position="right"
    >
        <DxValidator>
            <DxRequiredRule message="Required" />
        </DxValidator>
    </DxCalendar>
</template>

<script>
    // ...
</script>

React

App.js

import React from 'react';
// ...

function App() {
    return (
        <Calendar ...
            validationMessagePosition="right"
        >
            <Validator>
                <RequiredRule message="Required" />
            </Validator>
        </Calendar>
    ); 

};
export default App;

validationStatus

Indicates or specifies the current validation status.

Type:

ValidationStatus

Default Value: 'valid'

The following table illustrates the validation status indicators:

validationStatus	Indicator
`"pending"`
`"valid"`
`"invalid"`

When you assign "invalid" to validationStatus, you can also use the validationErrors array to set an error message as shown below:

jQuery

index.js

$(function() {
    const calendar = $("#calendarContainer").dxCalendar({
        // ...
    }).dxCalendar("instance");

    function setInvalidStatus(message) {
        calendar.option({
            validationStatus: "invalid",
            validationErrors: [{ message: message }]
        });
    }
});

Angular

app.component.html

app.component.ts

<dx-calendar
    [validationStatus]="validationStatus"
    [validationErrors]="validationErrors">
</dx-calendar>

// ...
export class AppComponent {
    validationStatus: string = "valid";
    validationErrors: any;
    // ...
    setInvalidStatus(message) {
        this.validationStatus = "invalid";
        this.validationErrors = [{ message: message }];
    }
}

Vue

App.vue

<template>
    <DxCalendar ...
        :validation-status="validationStatus"
        :validation-errors="validationErrors"
    />
</template>

<script>
    // ...
    export default {
        // ...
        data() {
            return {
                validationStatus: "valid",
                validationErrors: []
            }
        },
        methods: {
            setInvalidStatus(message) {
                this.validationStatus = "invalid";
                this.validationErrors = [{ message: message }];
            }
        }
    }
</script>

React

App.js

import React, { useState } from 'react';
// ...

function App() {
    const [validationStatus, setValidationStatus] = useState("valid");
    const [validationErrors, setValidationErrors] = useState([]);

    const setInvalidStatus = message => {
        setValidationStatus("invalid");
        setValidationErrors([{ message: message }]);
    }

    return (
        <Calendar
            validationStatus={validationStatus}
            validationErrors={validationErrors}
        />
    ); 

};
export default App;

value

An object or a value specifying the date and time currently selected in the calendar.

Type:

|

|

Default Value: null

Raised Events: onValueChanged

You can specify the current UI component value using any of the following formats.

Date
Specifies the date directly.
Number
Specifies the date using a timestamp (total milliseconds since 1970/01/01).
String
Specifies the date using a string value. The UI component supports the following formats of a date string.
- "yyyy-MM-dd" (for example, "2017-03-06")
- "yyyy-MM-ddTHH:mm:ss" (for example, "2017-03-27T16:54:48")
- "yyyy-MM-ddTHH:mm:ssZ" (for example, "2017-03-27T13:55:41Z")
- "yyyy-MM-ddTHH:mm:ssx" (for example, "2017-03-27T16:54:10+03")

If the UI component value is changed by an end user, the new value is saved in the same format as the initial value.

visible

Specifies whether the UI component is visible.

Type:

Default Value: true

weekNumberRule

Specifies a week number calculation rule.

Type:

WeekNumberRule

Default Value: 'auto'

This property can take on one of the following values:

firstDay
The first week of a year is the week that contains January 1.
firstFourDays
The first week of a year is the week that starts on one of the first four weekdays: Monday, Tuesday, Wednesday, or Thursday. This rule is defined by the ISO 8601 standard. If the first week of the year begins on a Friday, Saturday, or Sunday, this week is considered the last week of the previous year.
fullWeek
The first week of a year is the week that begins with a day that matches the firstDayOfWeek option value.
auto (default)
The week calculation rule depends on the locale. If a week starts on Monday, the firstFourDays rule is applied. Otherwise, the firstDay rule is in effect.

If you want to implement your own week number calculation rule, use the cellTemplate function:

jQuery

index.js

$(function() {
    let lastDateOfWeek;

    function getWeekNumber(date, firstDayOfWeek) {
        // Implement your own week calculation logic
    }

    function getCellTemplate(data) {
        if (data.view === 'month') {
            if (!data.date) {
                cssClass = 'week-number';
                data.text = getWeekNumber(lastDateOfWeek, 0).toString();
            } 
            else {
                lastDateOfWeek = data.date;
            }
        }
        return `<span>${data.text}</span>`;
    }

    $('#calendar-container').dxCalendar({
        value: new Date(2000, 0, 1),
        showWeekNumbers: true,
        cellTemplate: getCellTemplate
    });
});

Angular

app.component.html

app.component.ts

<dx-calendar
    [value]="currentValue"
    [showWeekNumbers]="true"
    (cellTemplate)="custom"
>
    <span
        *dxTemplate="let cell of 'custom'"
        [ngClass]="getCellCssClass(cell)"
    >
        {{ cell.text }}
    </span>
</dx-calendar>

// ...
export class AppComponent {
    lastDateOfWeek: Number;
    currentValue: Date = new Date(2000, 0, 1);

    getWeekNumber(date, firstDayOfWeek) {
        // Implement your own week calculation logic
    }

    getCellCssClass({ date, view, text }) {
        let cssClass = '';
        if (view === 'month') {
            if (!date) {
                cssClass = 'week-number';
                text = getWeekNumber(this.lastDateOfWeek, 0).toString();
            } 
            else {
                this.lastDateOfWeek = date;
            }
        }
        return cssClass;
    }
}

Vue

App.vue

<template>
    <DxCalendar
        :value="currentValue"
        :show-week-numbers="true"
        cell-template="custom"
    >
        <template #custom="{ data: cell }">
            <span :class="getCellCssClass(cell)">
                {{ cell.text }}
            </span>
        </template>
    </DxCalendar>
</template>

<script>
// ...
function getWeekNumber(date, firstDayOfWeek) {
    // Implement your own week calculation logic
}

export default {
    // ...
    data() {
        return {
            currentValue: new Date(2000, 0, 1),
            lastDateOfWeek: 0
        }
    }
    methods: {
        getCellCssClass({ date, view, text }) {
            let cssClass = '';
            if (view === 'month') {
                if (!date) {
                    cssClass = 'week-number';
                    text = getWeekNumber(this.lastDateOfWeek, 0).toString();
                } 
                else {
                    this.lastDateOfWeek = date;
                }
            }
            return cssClass;
        }
    }
}
</script>

React

App.js

// ...
let lastDateOfWeek;
const currentValue = new Date(2000, 0, 1);

const getWeekNumber(date, firstDayOfWeek) {
        // Implement your own week calculation logic
    }

const getCellCssClass({ date, view, text }) {
    let cssClass = '';
    if (view === 'month') {
        if (!date) {
            cssClass = 'week-number';
            text = getWeekNumber(lastDateOfWeek, 0).toString();
        } 
        else {
            lastDateOfWeek = date;
        }
    }
    return cssClass;
}

const customCell = (cell) => {
    const { text, } = cell;
    const className = getCellCssClass(cell);
    return (
        <span className={className}>
            { text }
        </span>
    );
}

function App() {
    return (
        <Calendar
            value={currentValue}
            showWeekNumbers={true}
            cellRender={customCell}
        >
        </Calendar>
    );
};

export default App;

width

Specifies the UI component's width.

Type:

|

|

Return Value:

|

The UI component's width.

Default Value: undefined

This property accepts a value of one of the following types:

Number
The width in pixels.
String
A CSS-accepted measurement of width. For example, "55px", "20vw", "80%", "auto", "inherit".
Function (deprecated since v21.2)
Refer to the W0017 warning description for information on how you can migrate to viewport units.

zoomLevel

Specifies the current calendar zoom level.

Type:

CalendarZoomLevel

Default Value: 'month'

Raised Events: onOptionChanged

Zoom level determines the size of a date range displayed on a single calendar page.