JavaScriptObject (GWT Javadoc)

java.lang.Object
- com.google.gwt.core.client.JavaScriptObject

Direct Known Subclasses:

ArrayBufferNative, ArrayBufferViewNative, CanvasPixelArray, Context2d, DataTransfer, EventTarget, FillStrokeStyle, ImageData, JsArray, JsArrayBoolean, JsArrayInteger, JsArrayMixed, JsArrayNumber, JsArrayString, JsDate, MediaError, NativeEvent, Node, NodeCollection, NodeList, PositionImpl, PositionImpl.CoordinatesImpl, StorageEvent, Style, TextMetrics, TimeRanges, TimeZoneInfo, Touch, XMLHttpRequest
```
public class JavaScriptObject
extends java.lang.Object
```
An opaque handle to a native JavaScript object. A JavaScriptObject cannot be created directly. JavaScriptObject should be declared as the return type of a JSNI method that returns native (non-Java) objects. A JavaScriptObject passed back into JSNI from Java becomes the original object, and can be accessed in JavaScript as expected.

Constructor Summary

Constructors
Modifier Constructor and Description

protected JavaScriptObject()
Not directly instantiable.

Constructors
Modifier	Constructor and Description
`protected`	`JavaScriptObject()` Not directly instantiable.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`<T extends JavaScriptObject> T`	`cast()` A helper method to enable cross-casting from any `JavaScriptObject` type to any other `JavaScriptObject` type.
`static JavaScriptObject`	`createArray()` Returns a new array.
`static JavaScriptObject`	`createArray(int size)` Returns a new array with a given size.
`static JavaScriptObject`	`createFunction()` Returns an empty function.
`static JavaScriptObject`	`createObject()` Returns a new object.
`boolean`	`equals(java.lang.Object other)` Calls a native JS `equals` method if any, otherwise returns `true` if the objects are JavaScript identical (triple-equals).
`int`	`hashCode()` Calls a native JS `hashCode` method if any, otherwise uses a monotonically increasing counter to assign a hash code to the underlying JavaScript object.
`java.lang.String`	`toSource()` Call the toSource() on the JSO.
`java.lang.String`	`toString()` Makes a best-effort attempt to get a useful debugging string describing the given JavaScriptObject.

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - JavaScriptObject
```
protected JavaScriptObject()
```
    Not directly instantiable. All subclasses must also define a protected, empty, no-arg constructor.
- Method Detail
  - createArray
```
public static JavaScriptObject createArray()
```
    Returns a new array.
  - createArray
```
public static JavaScriptObject createArray(int size)
```
    Returns a new array with a given size.
    Consider using this method in performance critical code instead of using createArray(), since this gives more hints to the underlying JavaScript VM for optimizations.
  - createFunction
```
public static JavaScriptObject createFunction()
```
    Returns an empty function.
  - createObject
```
public static JavaScriptObject createObject()
```
    Returns a new object.
  - cast
```
public final <T extends JavaScriptObject> T cast()
```
    A helper method to enable cross-casting from any JavaScriptObject type to any other JavaScriptObject type.
    
    Type Parameters:
    
    T - the target type
    
    Returns:
    
    this object as a different type
  - equals
```
public final boolean equals(java.lang.Object other)
```
    Calls a native JS equals method if any, otherwise returns true if the objects are JavaScript identical (triple-equals).
    
    Overrides:
    
    equals in class java.lang.Object
  - hashCode
```
public final int hashCode()
```
    Calls a native JS hashCode method if any, otherwise uses a monotonically increasing counter to assign a hash code to the underlying JavaScript object. Do not call this method on non-modifiable JavaScript objects.
    
    Overrides:
    
    hashCode in class java.lang.Object
    
    Returns:
    
    the hash code of the object
  - toSource
```
public java.lang.String toSource()
```
    Call the toSource() on the JSO.
  - toString
```
public final java.lang.String toString()
```
    Makes a best-effort attempt to get a useful debugging string describing the given JavaScriptObject. In Production Mode with assertions disabled, this will either call and return the JSO's toString() if one exists, or just return "[JavaScriptObject]". In Development Mode, or with assertions enabled, some stronger effort is made to represent other types of JSOs, including inspecting for document nodes' outerHTML and innerHTML, etc.
    
    Overrides:
    
    toString in class java.lang.Object

Class JavaScriptObject

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

JavaScriptObject

Method Detail

createArray

createArray

createFunction

createObject

cast

equals

hashCode

toSource

toString