Number

The Number field is used for numeric values such as integers, floating-point numbers, decimals, and other JVM numeric types.

By default, KraftAdmin automatically detects numeric properties and renders an appropriate number input. You only need to specify inputType = FormInputType.NUMBER when overriding the default behavior.

Supported Types

The following Kotlin and Java types are supported:

Automatic Detection

In most cases no annotation is required.

@Entity
class Product(

    var quantity: Int,

    var price: Double,

    var stock: Long
)

KraftAdmin automatically renders these as numeric inputs.

Explicit Configuration

You can explicitly configure the field using @KraftAdminField.

@KraftAdminField(
    label = "Price",
    inputType = FormInputType.NUMBER
)
var price: Double = 0.0

Required Field

@KraftAdminField(
    required = true,
    validationMessage = "Price is required."
)
var price: Double = 0.0

The field cannot be submitted with an empty value.

Placeholder

@KraftAdminField(
    placeholder = "Enter product price"
)
var price: Double = 0.0

Read-only

@KraftAdminField(
    readonly = true
)
var totalSales: Double = 0.0

The value is displayed but cannot be edited.

Hide from Tables

@KraftAdminField(
    showInTable = false
)
var internalCost: Double = 0.0

Useful for values that should only appear in the edit form.

Sorting

Sorting is enabled by default.

@KraftAdminField(
    sortable = false
)
var score: Double = 0.0

Validation

Numeric fields also support regular expression validation.

@KraftAdminField(
    regex = "^\d+(\.\d{1,2})?$",
    validationMessage = "Maximum two decimal places allowed."
)
var price: Double = 0.0

Grouping

Fields can be organized into logical sections.

@KraftAdminField(
    group = "Pricing"
)
var price: Double = 0.0

Best Practices

Related Properties

See Also

• Text
• Range
• Date
• Select
• Checkbox