Angular Common - Object Structures - format

This property accepts three types of values:

• String
  A predefined format or custom format string.

• Function
  Applies a custom format to a value and returns this value as a string. A shortcut for the formatter property.

• Object
  Allows you to configure the format. Can have one of the following structures:

  DevExtreme

  // Uses a predefined format
  format: {
      type: String, // one of the predefined formats
      precision: Number, // the precision of values
      currency: String // a specific 3-letter code for the "currency" format
  }

  or

  DevExtreme

  // Specifies a custom format
  format: {
      formatter: Function, // a custom formatting function
      parser: Function // a parsing function for string values
  }

  You can specify the Intl NumberFormat's and DateTimeFormat's options parameter fields:

  Intl

  format: { year: "2-digit", month: "narrow", day: "2-digit" }
  === or ===
  format: { style: "currency", currency: "EUR", useGrouping: true }

  If you use Globalize, you can use the fields that the numberFormatter, currencyFormatter, and dateFormatter accept instead of the fields described in this section. For example, you can use skeletons to format dates. Note that this approach can require additional CLDR modules not shipped with the DevExtreme package.

  Globalize

  format: { skeleton: 'GyMMMd' }

  NOTE

  Depending on the object structure, the format utility chooses the mechanism to use: DevExtreme internal, Intl, or Globalize. If you mix properties from different zones (DevExtreme, Intl, or Globalize) in an object, the result can be unpredictable.

View Demo

Alternatively, you can set the GlobalConfig.defaultCurrency property to apply the same currency to all DevExtreme components.

See Also

• format.precision
• Localization

If none of the predefined formats meet your requirements, use this function to specify a custom format. If formatter is the only field that you need to specify in the format object, assign the function straight to the format property as shown below.

format: function (value) {
    // ...
    return formattedValue;
}

A UI component calls this function internally, for example, when a user enters a value. The following code gives an example of the formatter and parser functions which turns dates into strings, and parses strings back into dates, respectively.

formatter: function (date) {
    const day = date.getDate();
    const month = date.getMonth() + 1;
    const year = date.getFullYear();

    return `${day}.${month}.${year}`;
},
parser: function (e) {
    const parts = e.split(".");
    const day = Number(parts[0]);
    const month = Number(parts[1] - 1);
    const year = Number(parts[2]);

    return new Date(year, month, day);
}

View Demo

const decimalNumber = 1.234;

format: {
    type: "decimal",
    precision: 2
}
// 01.234

const decimalNumber = 1.234;

format: {
    type: "fixedPoint",
    precision: 2
}
// 1.23

Depending on the values you need to format, you can choose one of the following predefined formats:

Numeric Formats

const smallNumber = 1.2345;

type: "fixedPoint" // 1
type: "decimal" // 1.2345
type: "percent" // 123%
type: "currency" // $1

const largeNumber = 1000000000;

type: "exponential" // 1.0E+9
type: "thousands" // 1,000,000K
type: "millions" // 1,000M
type: "billions" // 1B
type: "trillions" // 0T
type: "largeNumber" // 1B (uses "thousands", "millions", "billions", or "trillions", depending on the value)

Date-Time Formats

const date = new Date(2021, 6, 15, 20, 45, 34);

type: "longDate" // Thursday, July 15, 2021
type: "longTime" // 8:45:34 PM
type: "longDateLongTime" // Thursday, July 15, 2021, 8:45:34 PM
type: "monthAndDay" // July 15
type: "monthAndYear" // July 2021
type: "quarterAndYear" // Q3 2021
type: "shortDate" // 7/15/2021
type: "shortTime" // 8:45 PM
type: "shortDateShortTime" // 7/15/2021, 8:45 PM
type: "millisecond" // 000
type: "second" // 34
type: "minute" // 45
type: "hour" // 20
type: "day" // 15
type: "dayOfWeek" // Thursday
type: "month" // July
type: "quarter" // Q3
type: "year" // 2021

If the type is the only field you need to specify in the format object, assign the value of this field straight to the format property as shown below.

format: "shortDate"

View Demo

See Also

• Value Formatting

The accounting style adds parentheses to negative numbers instead of the minus sign. To disable the accounting style in the component and display formatted numbers of the currency type with the minus sign, set this property to false.

format({
    type: "currency",
    useCurrencyAccountingStyle: false 
});

If you do not specify this property, the defaultUseCurrencyAccountingStyle global configuration setting is in effect. The useCurrencyAccountingStyle property has priority over the global setting.