JSObject extension type - dart:js_interop library (original) (raw)

A JavaScript Object.

JSObject is the supertype of all JavaScript objects, but not other JS types, like primitives. See https://dart.dev/interop/js-interop for more details on how to use JavaScript interop.

When declaring interop extension types, JSObject is usually the type you will use as the representation type.

on

• JSObjectRepType

Implemented types

• JSAny

Implementers

• JSArray
• JSArrayBuffer
• JSBoxedDartObject
• JSDataView
• JSFunction
• JSPromise
• JSTypedArray

Available extensions

• JSAnyOperatorExtension
• JSAnyUtilityExtension
• JSObjectUnsafeUtilExtension
• NullableUndefineableJSAnyExtension

Annotations

• @JS('Object')

Constructors

JSObject()

Creates a new empty JavaScript object.

JSObject.fromInteropObject(Object interopObject)

Creates a JSObject from an object provided by an earlier interop library.

Properties

hashCode → int

The hash code for this object.

no setterinherited

isDefinedAndNotNull → bool

Available on JSAny?, provided by the NullableUndefineableJSAnyExtension extension

no setter

isNull → bool

Available on JSAny?, provided by the NullableUndefineableJSAnyExtension extension

Whether this value corresponds to JavaScript null.

no setter

isTruthy → JSBoolean

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of !!`this` in JavaScript.

no setter

isUndefined → bool

Available on JSAny?, provided by the NullableUndefineableJSAnyExtension extension

Whether this value corresponds to JavaScript undefined.

no setter

isUndefinedOrNull → bool

Available on JSAny?, provided by the NullableUndefineableJSAnyExtension extension

no setter

not → JSBoolean

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of !`this` in JavaScript.

no setter

runtimeType → Type

A representation of the runtime type of the object.

no setterinherited

Methods

add(JSAny? any)→ JSAny

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of `this` + `any` in JavaScript.

and(JSAny? any)→ JSAny?

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of `this` && `any` in JavaScript.

callMethod<R extends JSAny?>(JSAny method, [JSAny? arg1, JSAny? arg2, JSAny? arg3, JSAny? arg4])→ R

Available on JSObject, provided by the JSObjectUnsafeUtilExtension extension

Calls method on this JSObject with up to four arguments.

callMethodVarArgs<R extends JSAny?>(JSAny method, [List<JSAny?>? arguments])→ R

Available on JSObject, provided by the JSObjectUnsafeUtilExtension extension

Calls method on this JSObject with a variable number of arguments.

dartify()→ Object?

Available on JSAny?, provided by the JSAnyUtilityExtension extension

Converts a JavaScript value to the Dart equivalent if possible.

delete(JSAny property)→ JSBoolean

Available on JSObject, provided by the JSObjectUnsafeUtilExtension extension

Deletes the property with key property from this JSObject.

divide(JSAny? any)→ JSAny

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of `this` / `any` in JavaScript.

equals(JSAny? any)→ JSBoolean

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of `this` == `any` in JavaScript.

exponentiate(JSAny? any)→ JSAny

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of `this` ** `any` in JavaScript.

getProperty<R extends JSAny?>(JSAny property)→ R

Available on JSObject, provided by the JSObjectUnsafeUtilExtension extension

The value of the property key property of this JSObject.

greaterThan(JSAny? any)→ JSBoolean

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of `this` > `any` in JavaScript.

greaterThanOrEqualTo(JSAny? any)→ JSBoolean

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of `this` >= `any` in JavaScript.

has(String property)→ bool

Available on JSObject, provided by the JSObjectUnsafeUtilExtension extension

Shorthand helper for hasProperty to check whether this JSObjectcontains the property key property, but takes and returns a Dart value.

hasProperty(JSAny property)→ JSBoolean

Available on JSObject, provided by the JSObjectUnsafeUtilExtension extension

Whether or not this JSObject contains the property key property.

instanceof(JSFunction constructor)→ bool

Available on JSAny?, provided by the JSAnyUtilityExtension extension

Whether this [JSAny](../dart-js%5Finterop/JSAny-extension-type.html)? is an instanceof constructor.

instanceOfString(String constructorName)→ bool

Available on JSAny?, provided by the JSAnyUtilityExtension extension

Whether this [JSAny](../dart-js%5Finterop/JSAny-extension-type.html)? is an instanceof the constructor that is defined by constructorName, which is looked up in theglobalContext.

isA<T extends JSAny?>()→ bool

Available on JSAny?, provided by the JSAnyUtilityExtension extension

Whether this [JSAny](../dart-js%5Finterop/JSAny-extension-type.html)? is an instance of the JavaScript type that is declared by T.

lessThan(JSAny? any)→ JSBoolean

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of `this` < `any` in JavaScript.

lessThanOrEqualTo(JSAny? any)→ JSBoolean

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of `this` <= `any` in JavaScript.

modulo(JSAny? any)→ JSAny

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of `this` % `any` in JavaScript.

multiply(JSAny? any)→ JSAny

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of `this` * `any` in JavaScript.

noSuchMethod(Invocation invocation)→ dynamic

Invoked when a nonexistent method or property is accessed.

inherited

notEquals(JSAny? any)→ JSBoolean

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of `this` != `any` in JavaScript.

or(JSAny? any)→ JSAny?

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of `this` || `any` in JavaScript.

setProperty(JSAny property, JSAny? value)→ void

Available on JSObject, provided by the JSObjectUnsafeUtilExtension extension

Write the value of property key property of this JSObject.

strictEquals(JSAny? any)→ JSBoolean

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of `this` === `any` in JavaScript.

strictNotEquals(JSAny? any)→ JSBoolean

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of `this` !== `any` in JavaScript.

subtract(JSAny? any)→ JSAny

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of `this` - `any` in JavaScript.

toString()→ String

A string representation of this object.

inherited

typeofEquals(String typeString)→ bool

Available on JSAny?, provided by the JSAnyUtilityExtension extension

Whether the result of typeof on this [JSAny](../dart-js%5Finterop/JSAny-extension-type.html)? istypeString.

unsignedRightShift(JSAny? any)→ JSNumber

Available on JSAny?, provided by the JSAnyOperatorExtension extension

The result of `this` >>> `any` in JavaScript.

Operators

operator ==(Object other)→ bool

The equality operator.

inherited

operator [](String property)→ JSAny?

Available on JSObject, provided by the JSObjectUnsafeUtilExtension extension

Shorthand helper for getProperty to get the value of the property keyproperty of this JSObject, but takes and returns a Dart value.

operator []=(String property, JSAny? value)→ void

Available on JSObject, provided by the JSObjectUnsafeUtilExtension extension

Shorthand helper for setProperty to write the value of the property key property of this JSObject, but takes a Dart value.