DevExtreme React - Value Formatting

This article describes the API used to apply a format to date and numeric values. The specified format is the same in any locale unless Intl or Globalize is used.

Format Widget Values

Predefined Formats

Predefined formats are string literals for formatting numbers and dates. See the format.type description for a full list.

Set the format widget option to apply a predefined format. In the following code, this option specifies the format and precision of the tooltip's value in the Slider widget. The value contains two decimal digits when the precision value is 2.

jQuery
JavaScript
$(function() {
    $("#sliderContainer").dxSlider({
        min: 0, max: 10,
        value: 6, step: 0.01,
        tooltip: {
            enabled: true,
            format: {
                type: "fixedPoint",
                precision: 2
            }
        }
    });
});
Angular
HTML
TypeScript
<dx-slider
    [min]="0" [max]="10"
    [(value)]="sliderValue" [step]="0.01">
    <dxo-tooltip
        [enabled]="true">
        <dxo-format
            type="fixedPoint"
            [precision]="2">
        </dxo-format>
    </dxo-tooltip>
</dx-slider>
import { DxSliderModule } from "devextreme-angular";
// ...
export class AppComponent {
    sliderValue: number = 6;
}
@NgModule({
    imports: [
        // ...
        DxSliderModule
    ],
    // ...
})

The format option in the previous example is specified with an object which allows you to specify the precision. However, you can specify the format option with a string literal if this is not required.

NOTE
The predefined formats also include a currency format which adds a dollar sign before the value. You should use Intl or Globalize in your app to correctly localize and format currencies.
See Also

Custom Format String

A custom format string specifies a format using Unicode Locale Data Markup Language (LDML) patterns. An LDML pattern consists of wildcard characters and characters displayed as is. The following wildcard characters are supported:

Numeric Formats

Format character Description
0 A digit. Displays '0' if it is not specified in the UI.
# A digit or nothing. One symbol represents several integer digits, but only one decimal digit.
For example, "#.#" represents "123.4", but not "123.45".
. A decimal separator.
Displayed according to the decimalSeparator or the set locale if you use Intl or Globalize.
, A group separator.
Displayed according to the thousandsSeparator or the set locale if you use Intl or Globalize.
% The percent sign. Divides the input value by 100.
If it is enclosed in single quotes ('%'), it only adds this sign to the input value.
; Separates positive and negative numbers. If there is no explicit negative format, a positive number receives the "-" prefix.
Other characters Any character. Should be placed only at the format string's beginning or end.
You can use the special characters above as well (in single quotation marks).

Date-Time Formats

Format character Description
y A calendar year.
Q A quarter number or name.
Available combinations with example: "Q" - "2", "QQ" - "02", "QQQ" - "Q2" and "QQQQ" - "2nd quarter".
M A month number or name.
Available combinations with example: "M" - "9", "MM" - "09", "MMM" - "Sep", "MMMM" - "September", "MMMMM" - "S".
d A month day.
E A week day name.
Available combinations with example: "E", "EE" or "EEE" - "Tue", "EEEE" - "Tuesday", "EEEEE" - "T".
a A day period (am or pm).
h An hour. From 1 to 12.
H An hour. From 0 to 23.
m A minute.
s A second.
S A fractional second.
'' (two single quotes) Literal text. Text enclosed in two single quotes is shown as-is.
NOTE
Reference the Globalize library in your application to use other numeric or datetime format characters.

The following code shows how to apply LDML patterns to format numbers and dates:

jQuery
JavaScript
$(function() {
    $("#numberBoxContainer").dxNumberBox({
        value: 5,
        format: "0.##" // "0.01", "5", "5.01"
    });
    $("#dateBoxContainer").dxDateBox({
        value: new Date(),
        displayFormat: "MMM d, YYYY" // "Jun 15, 2018"
    });
});
Angular
HTML
TypeScript
<dx-number-box
    [(value)]="numberBoxValue"
    format="0.##"> <!-- "0.01", "5", "5.01" -->
</dx-number-box>
<dx-date-box
    [(value)]="dateBoxValue"
    format="MMM d, YYYY"> <!-- "Jun 15, 2018" -->
</dx-date-box>
import { DxNumberBoxModule, DxDateBoxModule } from "devextreme-angular";
// ...
export class AppComponent {
    numberBoxValue: number = 5;
    dateBoxValue: Date = new Date();
}
@NgModule({
    imports: [
        // ...
        DxNumberBoxModule,
        DxDateBoxModule,
    ],
    // ...
})
See Also

Custom Function

A custom function is useful when advanced formatting is required. The value to be formatted is passed to the function as the argument. In the following example, a custom function combines absolute and percentage values for the Slider widget's tooltip:

jQuery
JavaScript
$(function() {
    var sliderMaxValue = 10;

    $("#sliderContainer").dxSlider({
        min: 0, max: sliderMaxValue,
        value: 6, step: 0.01,
        tooltip: {
            enabled: true,
            format: function (value) {
                return value + " | " + ((value / sliderMaxValue) * 100).toFixed(1) + "%";
            }
        }
    });
});
Angular
HTML
TypeScript
<dx-slider
    [min]="0" [max]="sliderMaxValue"
    [(value)]="sliderValue" [step]="0.01">
    <dxo-tooltip
        [enabled]="true"
        [format]="formatSliderTooltip">
    </dxo-tooltip>
</dx-slider>
import { DxSliderModule } from "devextreme-angular";
// ...
export class AppComponent {
    sliderValue = 6;
    sliderMaxValue = 10;
    formatSliderTooltip (value) {
        return value + " | " + ((value / this.sliderMaxValue) * 100).toFixed(1) + "%";
    }
}
@NgModule({
    imports: [
        // ...
        DxSliderModule
    ],
    // ...
})

Format Custom Values

DevExtreme provides an API for formatting any date or number in your app. The following example shows how to format dates. The formatDate() method applies a predefined format to a date. A custom function or format string can be applied instead. The result is a string. This string is then converted back to a date using the parseDate() method.

jQuery
JavaScript
HTML
$(function() {
    var date = new Date();
    $("#dateInput").val(DevExpress.localization.formatDate(date, "shortDate"));
    $("#dateInput").change(function(event) {
        date = DevExpress.localization.parseDate(event.target.value, "shortDate");
    });
});
<input id="dateInput"/>
Angular
TypeScript
HTML
import { formatDate, parseDate } from "devextreme/localization";
// ...
export class AppComponent {
    _date: Date = new Date();
    get date() {
        return formatDate(this._date, "shortDate")
    }
    set date(value) {
        this._date = parseDate(value, "shortDate")
    }
}
<input 
    #dateInput
    [value]="date"
    (change)="date = dateInput.value;"/>

Similarly, you can use the formatNumber() and parseNumber() methods to format and parse a number or currency.