EventSource (GWT Elemental 2.7.0)

All Superinterfaces:

EventTarget

All Known Implementing Classes:

JsEventSource
```
public interface EventSource
extends EventTarget
```
The EventSource interface is used to manage server-sent events. You can set the onmessage attribute to a JavaScript function to receive non-typed messages (that is, messages with no event field). You can also call addEventListener() to listen for events just like any other event source.

See Using server-sent events for further details.

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`CLOSED` The connection is not being established, has been closed or there was a fatal error.
`static int`	`CONNECTING` The connection is being established.
`static int`	`OPEN` The connection is open and dispatching events.

Method Summary

Methods
Modifier and Type	Method and Description
`EventRemover`	`addEventListener(String type, EventListener listener)` Register an event handler of a specific event type on the `EventTarget`.
`EventRemover`	`addEventListener(String type, EventListener listener, boolean useCapture)` Register an event handler of a specific event type on the `EventTarget`.
`void`	`close()` Closes the connection, if any, and sets the `readyState` attribute to `CLOSED`.
`boolean`	`dispatchEvent(Event evt)` Dispatch an event to this `EventTarget`.
`EventListener`	`getOnerror()` A JavaScript function to call when an error occurs.
`EventListener`	`getOnmessage()` A JavaScript function to call when an a message without an `event` field arrives.
`EventListener`	`getOnopen()` A JavaScript function to call when the connection has opened.
`int`	`getReadyState()` The state of the connection, must be one of `CONNECTING`, `OPEN`, or `CLOSED`.
`String`	`getUrl()` Read only.
`String`	`getURL()`
`void`	`removeEventListener(String type, EventListener listener)` Removes an event listener from the `EventTarget`.
`void`	`removeEventListener(String type, EventListener listener, boolean useCapture)` Removes an event listener from the `EventTarget`.
`void`	`setOnerror(EventListener arg)`
`void`	`setOnmessage(EventListener arg)`
`void`	`setOnopen(EventListener arg)`

- Field Detail
  - CLOSED
```
static final int CLOSED
```
    The connection is not being established, has been closed or there was a fatal error.
    
    See Also:
    Constant Field Values
  - CONNECTING
```
static final int CONNECTING
```
    The connection is being established.
    
    See Also:
    Constant Field Values
  - OPEN
```
static final int OPEN
```
    The connection is open and dispatching events.
    
    See Also:
    Constant Field Values
- Method Detail
  - getURL
```
String getURL()
```
  - getOnerror
```
EventListener getOnerror()
```
    A JavaScript function to call when an error occurs.
  - setOnerror
```
void setOnerror(EventListener arg)
```
  - getOnmessage
```
EventListener getOnmessage()
```
    A JavaScript function to call when an a message without an event field arrives.
  - setOnmessage
```
void setOnmessage(EventListener arg)
```
  - getOnopen
```
EventListener getOnopen()
```
    A JavaScript function to call when the connection has opened.
  - setOnopen
```
void setOnopen(EventListener arg)
```
  - getReadyState
```
int getReadyState()
```
    The state of the connection, must be one of CONNECTING, OPEN, or CLOSED. Read only.
  - getUrl
```
String getUrl()
```
    Read only.
  - addEventListener
```
EventRemover addEventListener(String type,
                            EventListener listener)
```
    Description copied from interface: EventTarget
    
    Register an event handler of a specific event type on the EventTarget.
    
    Specified by:
    
    addEventListener in interface EventTarget
  - addEventListener
```
EventRemover addEventListener(String type,
                            EventListener listener,
                            boolean useCapture)
```
    Description copied from interface: EventTarget
    
    Register an event handler of a specific event type on the EventTarget.
    
    Specified by:
    
    addEventListener in interface EventTarget
  - close
```
void close()
```
    Closes the connection, if any, and sets the readyState attribute to CLOSED. If the connection is already closed, the method does nothing.
  - dispatchEvent
```
boolean dispatchEvent(Event evt)
```
    Description copied from interface: EventTarget
    
    Dispatch an event to this EventTarget.
    
    Specified by:
    
    dispatchEvent in interface EventTarget
  - removeEventListener
```
void removeEventListener(String type,
                       EventListener listener)
```
    Description copied from interface: EventTarget
    
    Removes an event listener from the EventTarget.
    
    Specified by:
    
    removeEventListener in interface EventTarget
  - removeEventListener
```
void removeEventListener(String type,
                       EventListener listener,
                       boolean useCapture)
```
    Description copied from interface: EventTarget
    
    Removes an event listener from the EventTarget.
    
    Specified by:
    
    removeEventListener in interface EventTarget

Interface EventSource

Field Summary

Method Summary

Field Detail

CLOSED

CONNECTING

OPEN

Method Detail

getURL

getOnerror

setOnerror

getOnmessage

setOnmessage

getOnopen

setOnopen

getReadyState

getUrl

addEventListener

addEventListener

close

dispatchEvent

removeEventListener

removeEventListener