JsHelper (Charba - GWT Charts library based on CHART.JS)

java.lang.Object
- org.pepstock.charba.client.commons.JsHelper

```
public final class JsHelper
extends Object
```
This is a singleton wrapper for Java native object which is wrapping a CHARBA java script object implementation with some utilities to act on java script objects.

Author:

Andrea "Stock" Stocchero

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`List<String>`	`elementAttributes(Element element)` Returns a list of strings with element attributes.
`static JsHelper`	`get()` Singleton object to get the helper instance
`boolean`	`isCanvasGradient(NativeObjectContainer object, String key)` Returns `true` if the property into native object is a `CanvasGradient`.
`boolean`	`isCanvasPattern(NativeObjectContainer object, String key)` Returns `true` if the property into native object is a `CanvasPattern`.
`ChartNativeEvent`	`nativeEvent(NativeObject event, String key)` Returns a chart native event from CHART.JS event.
`<T> CallbackProxy<T>`	`newCallbackProxy()` Creates new proxy for callback which will pass `this` environment of java script as first argument of callback method.
`double`	`propertyAsDouble(Object object, String key)` Returns a property of java script object as double.
`int`	`propertyAsInt(Object object, String key)` Returns a property of java script object as integer.
`String`	`propertyAsString(Object object, String key)` Returns a property of java script object as string.
`void`	`setLineDash(Context2d context, ArrayInteger object)` Sets the line dash pattern used when stroking lines. It uses an array of values that specify alternating lengths of lines and gaps which describe the pattern.
`void`	`setLineDash(Context2d context, List<Integer> items)` Sets the line dash pattern used when stroking lines. It uses a list of values that specify alternating lengths of lines and gaps which describe the pattern.
`ObjectType`	`typeOf(Object object)` Returns the java script object type of object.
`ObjectType`	`typeOf(Object object, String key)` Returns the java script object type of a property.
`Object`	`undefined()` Returns an undefined reference

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

- Method Detail
  - get
```
public static JsHelper get()
```
    Singleton object to get the helper instance
    
    Returns:
    
    jsHelper instance.
  - undefined
```
public Object undefined()
```
    Returns an undefined reference
    
    Returns:
    
    undefined reference
  - elementAttributes
```
public List<String> elementAttributes(Element element)
```
    Returns a list of strings with element attributes.
    
    Parameters:
    
    element - DOM element to scan
    
    Returns:
    
    a list of strings with element attributes
  - typeOf
```
public ObjectType typeOf(Object object)
```
    Returns the java script object type of object.
    
    Parameters:
    
    object - the object to get type.
    
    Returns:
    
    the object type
  - typeOf
```
public ObjectType typeOf(Object object,
                         String key)
```
    Returns the java script object type of a property.
    
    Parameters:
    
    object - the object on which to search the property.
    
    key - the string name of the property to test.
    
    Returns:
    
    the object type
  - newCallbackProxy
```
public <T> CallbackProxy<T> newCallbackProxy()
```
    Creates new proxy for callback which will pass this environment of java script as first argument of callback method.
    
    Type Parameters:
    
    T - type of callback wrapped by proxy
    
    Returns:
    
    new proxy for callback.
  - propertyAsInt
```
public int propertyAsInt(Object object,
                         String key)
```
    Returns a property of java script object as integer.
    
    Parameters:
    
    object - the object on which to define the property.
    
    key - the string name of the property to be defined or modified..
    
    Returns:
    
    integer value or UndefinedValues.INTEGER if arguments are not consistent
  - propertyAsDouble
```
public double propertyAsDouble(Object object,
                               String key)
```
    Returns a property of java script object as double.
    
    Parameters:
    
    object - the object on which to define the property.
    
    key - the string name of the property to be defined or modified..
    
    Returns:
    
    double value or UndefinedValues.DOUBLE if arguments are not consistent
  - propertyAsString
```
public String propertyAsString(Object object,
                               String key)
```
    Returns a property of java script object as string.
    
    Parameters:
    
    object - the object on which to define the property.
    
    key - the string name of the property to be defined or modified..
    
    Returns:
    
    string value or UndefinedValues.STRING if arguments are not consistent
  - isCanvasPattern
```
public boolean isCanvasPattern(NativeObjectContainer object,
                               String key)
```
    Returns true if the property into native object is a CanvasPattern.
    
    Parameters:
    
    object - the object on which to define the property.
    
    key - the string name of the property to be defined or modified..
    
    Returns:
    
    true if the property into native object is a CanvasPattern
  - isCanvasGradient
```
public boolean isCanvasGradient(NativeObjectContainer object,
                                String key)
```
    Returns true if the property into native object is a CanvasGradient.
    
    Parameters:
    
    object - the object on which to define the property.
    
    key - the string name of the property to be defined or modified..
    
    Returns:
    
    true if the property into native object is a CanvasGradient
  - setLineDash
```
public void setLineDash(Context2d context,
                        List<Integer> items)
```
    Sets the line dash pattern used when stroking lines.
    It uses a list of values that specify alternating lengths of lines and gaps which describe the pattern.
    
    Parameters:
    
    context - context of canvas
    
    items - list of values that specify alternating lengths of lines and gaps which describe the pattern
  - setLineDash
```
public void setLineDash(Context2d context,
                        ArrayInteger object)
```
    Sets the line dash pattern used when stroking lines.
    It uses an array of values that specify alternating lengths of lines and gaps which describe the pattern.
    
    Parameters:
    
    context - context of canvas
    
    object - array of values that specify alternating lengths of lines and gaps which describe the pattern
  - nativeEvent
```
public ChartNativeEvent nativeEvent(NativeObject event,
                                    String key)
```
    Returns a chart native event from CHART.JS event.
    
    Parameters:
    
    event - CHART.JS event
    
    key - key of java script object
    
    Returns:
    
    a chart native event

Class JsHelper

Method Summary

Methods inherited from class java.lang.Object

Method Detail

get

undefined

elementAttributes

typeOf

typeOf

newCallbackProxy

propertyAsInt

propertyAsDouble

propertyAsString

isCanvasPattern

isCanvasGradient

setLineDash

setLineDash

nativeEvent