java.lang.Object
- com.vaadin.flow.shared.JsonConstants

All Implemented Interfaces:

Serializable
```
public class JsonConstants
extends Object
implements Serializable
```
A utility class providing constants for JSON related features.

Since:

1.0

Author:

Vaadin Ltd

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type	Field	Description
`static String`	`CHANGE_FEATURE`	Key holding the feature of a change.
`static String`	`CHANGE_FEATURE_TYPE`	Key holding the feature type.
`static String`	`CHANGE_MAP_KEY`	Key holding the map key of the change.
`static String`	`CHANGE_NODE`	Key holding id of the node affected by a change.
`static String`	`CHANGE_PUT_NODE_VALUE`	Key holder the node value of a put change.
`static String`	`CHANGE_PUT_VALUE`	Key holding the value of a put change.
`static String`	`CHANGE_SPLICE_ADD`	Key holding values to add for a splice.
`static String`	`CHANGE_SPLICE_ADD_NODES`	Key holding nodes to add for a splice.
`static String`	`CHANGE_SPLICE_INDEX`	Key holding the index of a splice.
`static String`	`CHANGE_SPLICE_REMOVE`	Key holding the number of items to remove for a splice.
`static String`	`CHANGE_TYPE`	Key holding the type of a change.
`static String`	`CHANGE_TYPE_ATTACH`	Change type for attaching nodes.
`static String`	`CHANGE_TYPE_CLEAR`	Change type for list clear changes.
`static String`	`CHANGE_TYPE_DETACH`	Change type for detaching nodes.
`static String`	`CHANGE_TYPE_NOOP`	Change type for empty change (populate the feature on the client side only).
`static String`	`CHANGE_TYPE_PUT`	Change type for map put changes.
`static String`	`CHANGE_TYPE_REMOVE`	Change type for map remove changes.
`static String`	`CHANGE_TYPE_SPLICE`	Change type for list splice changes.
`static String`	`EVENT_DATA_PHASE`	Key holding the debounce phase for an event data map from the client.
`static String`	`EVENT_PHASE_INTERMEDIATE`	Character used for representing `DebouncePhase.INTERMEDIATE`.
`static String`	`EVENT_PHASE_LEADING`	Character used for representing `DebouncePhase.LEADING`.
`static String`	`EVENT_PHASE_TRAILING`	Character used for representing `DebouncePhase.TRAILING`.
`static String`	`JSON_CONTENT_TYPE`	The content type for JSON requests/responses.
`static String`	`MAP_STATE_NODE_EVENT_DATA`	Token used as an event data expression or prefix to an event data expression to represent that the state node ID should be fetched for the element, or its closest parent, that corresponds to `event.target` or the element returned by the evaluated expression.
`static String`	`META_ASYNC`	Key used when the message is sent asynchronously via push channel.
`static String`	`META_SESSION_EXPIRED`	Key used when informing the client side that the session has expired.
`static String`	`RPC_ATTACH_ASSIGNED_ID`	Key used to hold assigned state node identifier for attach existing element request.
`static String`	`RPC_ATTACH_EXISTING_ELEMENT`	Type value for attach existing element server callback.
`static String`	`RPC_ATTACH_EXISTING_ELEMENT_BY_ID`	Type value for attach existing element server callback.
`static String`	`RPC_ATTACH_ID`	Key used to hold id of the element for attach existing element request.
`static String`	`RPC_ATTACH_INDEX`	Key used to hold index of server side element for attach existing element request.
`static String`	`RPC_ATTACH_REQUESTED_ID`	Key used to hold requested state node identifier for attach existing element request.
`static String`	`RPC_ATTACH_TAG_NAME`	Key used to hold tag name for attach existing element request.
`static String`	`RPC_CHANNEL`	Key for the channel id in return channel messages.
`static String`	`RPC_CHANNEL_ARGUMENTS`	Key for the arguments array in return channel messages.
`static String`	`RPC_EVENT_DATA`	Key holding the event data in event messages sent from the client.
`static String`	`RPC_EVENT_TYPE`	Key holding the event type in event messages sent from the client.
`static String`	`RPC_FEATURE`	Key used to hold the feature id when synchronizing node values.
`static String`	`RPC_NAVIGATION_LOCATION`	Key used to hold the location in a navigation message.
`static String`	`RPC_NAVIGATION_ROUTERLINK`	Key used in navigation messages triggered by a router link.
`static String`	`RPC_NAVIGATION_STATE`	Key used to hold the state in a navigation message.
`static String`	`RPC_NODE`	Key holding the node in messages sent from the client.
`static String`	`RPC_PROMISE_CALLBACK_NAME`	Name of the $server property that is used to track pending promises.
`static String`	`RPC_PROPERTY`	Key used to hold the name of the synchronized property.
`static String`	`RPC_PROPERTY_VALUE`	Key used to hold the value of the synchronized property.
`static String`	`RPC_PUBLISHED_SERVER_EVENT_HANDLER`	Type value for events sent from the client to an event handler published on the server.
`static String`	`RPC_TEMPLATE_EVENT_ARGS`	Key used to hold the argument values for server side method call.
`static String`	`RPC_TEMPLATE_EVENT_METHOD_NAME`	Key used to hold the server side method name in template event messages sent from the client.
`static String`	`RPC_TEMPLATE_EVENT_PROMISE`	Key used to hold the promise id for a server side method call.
`static String`	`RPC_TYPE`	Key holding the type in of messages sent from the client.
`static String`	`RPC_TYPE_CHANNEL`	RPC type value used for return channel messages.
`static String`	`RPC_TYPE_EVENT`	Type value for events sent from the client.
`static String`	`RPC_TYPE_MAP_SYNC`	Type value for model map synchronizations sent from the client.
`static String`	`RPC_TYPE_NAVIGATION`	Type value for navigation events from the client.
`static String`	`SYNCHRONIZE_PROPERTY_TOKEN`	Token used as an event data expression to represent that properties should be synchronized.
`static String`	`UIDL_KEY_EXECUTE`	Key used for data related to `Page.executeJs(String, Serializable...)` in UIDL messages.

Constructor Summary

Constructors
Constructor Description

JsonConstants()

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

- Field Detail
  - JSON_CONTENT_TYPE
```
public static final String JSON_CONTENT_TYPE
```
    The content type for JSON requests/responses.
    
    See Also:
    
    Constant Field Values
  - CHANGE_NODE
```
public static final String CHANGE_NODE
```
    Key holding id of the node affected by a change.
    
    See Also:
    
    Constant Field Values
  - CHANGE_TYPE
```
public static final String CHANGE_TYPE
```
    Key holding the type of a change.
    
    See Also:
    
    Constant Field Values
  - CHANGE_TYPE_NOOP
```
public static final String CHANGE_TYPE_NOOP
```
    Change type for empty change (populate the feature on the client side only).
    
    See Also:
    
    Constant Field Values
  - CHANGE_TYPE_ATTACH
```
public static final String CHANGE_TYPE_ATTACH
```
    Change type for attaching nodes.
    
    See Also:
    
    Constant Field Values
  - CHANGE_TYPE_DETACH
```
public static final String CHANGE_TYPE_DETACH
```
    Change type for detaching nodes.
    
    See Also:
    
    Constant Field Values
  - CHANGE_TYPE_SPLICE
```
public static final String CHANGE_TYPE_SPLICE
```
    Change type for list splice changes.
    
    See Also:
    
    Constant Field Values
  - CHANGE_TYPE_PUT
```
public static final String CHANGE_TYPE_PUT
```
    Change type for map put changes.
    
    See Also:
    
    Constant Field Values
  - CHANGE_TYPE_REMOVE
```
public static final String CHANGE_TYPE_REMOVE
```
    Change type for map remove changes.
    
    See Also:
    
    Constant Field Values
  - CHANGE_TYPE_CLEAR
```
public static final String CHANGE_TYPE_CLEAR
```
    Change type for list clear changes.
    
    See Also:
    
    Constant Field Values
  - CHANGE_FEATURE
```
public static final String CHANGE_FEATURE
```
    Key holding the feature of a change.
    
    See Also:
    
    Constant Field Values
  - CHANGE_FEATURE_TYPE
```
public static final String CHANGE_FEATURE_TYPE
```
    Key holding the feature type.
    
    See Also:
    
    Constant Field Values
  - CHANGE_MAP_KEY
```
public static final String CHANGE_MAP_KEY
```
    Key holding the map key of the change.
    
    See Also:
    
    Constant Field Values
  - CHANGE_SPLICE_ADD_NODES
```
public static final String CHANGE_SPLICE_ADD_NODES
```
    Key holding nodes to add for a splice.
    
    See Also:
    
    Constant Field Values
  - CHANGE_SPLICE_ADD
```
public static final String CHANGE_SPLICE_ADD
```
    Key holding values to add for a splice.
    
    See Also:
    
    Constant Field Values
  - CHANGE_SPLICE_REMOVE
```
public static final String CHANGE_SPLICE_REMOVE
```
    Key holding the number of items to remove for a splice.
    
    See Also:
    
    Constant Field Values
  - CHANGE_SPLICE_INDEX
```
public static final String CHANGE_SPLICE_INDEX
```
    Key holding the index of a splice.
    
    See Also:
    
    Constant Field Values
  - CHANGE_PUT_VALUE
```
public static final String CHANGE_PUT_VALUE
```
    Key holding the value of a put change.
    
    See Also:
    
    Constant Field Values
  - CHANGE_PUT_NODE_VALUE
```
public static final String CHANGE_PUT_NODE_VALUE
```
    Key holder the node value of a put change.
    
    See Also:
    
    Constant Field Values
  - RPC_TYPE
```
public static final String RPC_TYPE
```
    Key holding the type in of messages sent from the client.
    
    See Also:
    
    Constant Field Values
  - RPC_TYPE_EVENT
```
public static final String RPC_TYPE_EVENT
```
    Type value for events sent from the client.
    
    See Also:
    
    Constant Field Values
  - RPC_TYPE_NAVIGATION
```
public static final String RPC_TYPE_NAVIGATION
```
    Type value for navigation events from the client.
    
    See Also:
    
    Constant Field Values
  - RPC_NODE
```
public static final String RPC_NODE
```
    Key holding the node in messages sent from the client.
    
    See Also:
    
    Constant Field Values
  - RPC_EVENT_TYPE
```
public static final String RPC_EVENT_TYPE
```
    Key holding the event type in event messages sent from the client.
    
    See Also:
    
    Constant Field Values
  - RPC_TYPE_MAP_SYNC
```
public static final String RPC_TYPE_MAP_SYNC
```
    Type value for model map synchronizations sent from the client.
    
    See Also:
    
    Constant Field Values
  - RPC_EVENT_DATA
```
public static final String RPC_EVENT_DATA
```
    Key holding the event data in event messages sent from the client.
    
    See Also:
    
    Constant Field Values
  - UIDL_KEY_EXECUTE
```
public static final String UIDL_KEY_EXECUTE
```
    Key used for data related to Page.executeJs(String, Serializable...) in UIDL messages.
    
    See Also:
    
    Constant Field Values
  - RPC_FEATURE
```
public static final String RPC_FEATURE
```
    Key used to hold the feature id when synchronizing node values.
    
    See Also:
    
    Constant Field Values
  - RPC_PROPERTY
```
public static final String RPC_PROPERTY
```
    Key used to hold the name of the synchronized property.
    
    See Also:
    
    Constant Field Values
  - RPC_PROPERTY_VALUE
```
public static final String RPC_PROPERTY_VALUE
```
    Key used to hold the value of the synchronized property.
    
    See Also:
    
    Constant Field Values
  - RPC_NAVIGATION_LOCATION
```
public static final String RPC_NAVIGATION_LOCATION
```
    Key used to hold the location in a navigation message.
    
    See Also:
    
    Constant Field Values
  - RPC_NAVIGATION_STATE
```
public static final String RPC_NAVIGATION_STATE
```
    Key used to hold the state in a navigation message.
    
    See Also:
    
    Constant Field Values
  - RPC_NAVIGATION_ROUTERLINK
```
public static final String RPC_NAVIGATION_ROUTERLINK
```
    Key used in navigation messages triggered by a router link.
    
    See Also:
    
    Constant Field Values
  - RPC_PUBLISHED_SERVER_EVENT_HANDLER
```
public static final String RPC_PUBLISHED_SERVER_EVENT_HANDLER
```
    Type value for events sent from the client to an event handler published on the server.
    
    See Also:
    
    Constant Field Values
  - RPC_TEMPLATE_EVENT_METHOD_NAME
```
public static final String RPC_TEMPLATE_EVENT_METHOD_NAME
```
    Key used to hold the server side method name in template event messages sent from the client.
    
    See Also:
    
    Constant Field Values
  - RPC_TEMPLATE_EVENT_ARGS
```
public static final String RPC_TEMPLATE_EVENT_ARGS
```
    Key used to hold the argument values for server side method call.
    
    See Also:
    
    RPC_TEMPLATE_EVENT_METHOD_NAME, RPC_PUBLISHED_SERVER_EVENT_HANDLER, Constant Field Values
  - RPC_TEMPLATE_EVENT_PROMISE
```
public static final String RPC_TEMPLATE_EVENT_PROMISE
```
    Key used to hold the promise id for a server side method call.
    
    See Also:
    
    Constant Field Values
  - RPC_PROMISE_CALLBACK_NAME
```
public static final String RPC_PROMISE_CALLBACK_NAME
```
    Name of the $server property that is used to track pending promises. The name is chosen to avoid conflicts with genuine $server method names.
    
    See Also:
    
    Constant Field Values
  - RPC_ATTACH_EXISTING_ELEMENT
```
public static final String RPC_ATTACH_EXISTING_ELEMENT
```
    Type value for attach existing element server callback.
    
    See Also:
    
    RPC_ATTACH_ASSIGNED_ID, RPC_ATTACH_REQUESTED_ID, RPC_ATTACH_TAG_NAME, RPC_ATTACH_INDEX, Constant Field Values
  - RPC_ATTACH_EXISTING_ELEMENT_BY_ID
```
public static final String RPC_ATTACH_EXISTING_ELEMENT_BY_ID
```
    Type value for attach existing element server callback.
    
    See Also:
    
    RPC_ATTACH_ASSIGNED_ID, RPC_ATTACH_REQUESTED_ID, RPC_ATTACH_TAG_NAME, RPC_ATTACH_ID, Constant Field Values
  - RPC_ATTACH_REQUESTED_ID
```
public static final String RPC_ATTACH_REQUESTED_ID
```
    Key used to hold requested state node identifier for attach existing element request.
    
    See Also:
    
    Constant Field Values
  - RPC_ATTACH_ASSIGNED_ID
```
public static final String RPC_ATTACH_ASSIGNED_ID
```
    Key used to hold assigned state node identifier for attach existing element request.
    
    See Also:
    
    Constant Field Values
  - RPC_ATTACH_TAG_NAME
```
public static final String RPC_ATTACH_TAG_NAME
```
    Key used to hold tag name for attach existing element request.
    
    See Also:
    
    Constant Field Values
  - RPC_ATTACH_INDEX
```
public static final String RPC_ATTACH_INDEX
```
    Key used to hold index of server side element for attach existing element request.
    
    See Also:
    
    Constant Field Values
  - RPC_ATTACH_ID
```
public static final String RPC_ATTACH_ID
```
    Key used to hold id of the element for attach existing element request.
    
    See Also:
    
    Constant Field Values
  - META_SESSION_EXPIRED
```
public static final String META_SESSION_EXPIRED
```
    Key used when informing the client side that the session has expired.
    
    See Also:
    
    Constant Field Values
  - META_ASYNC
```
public static final String META_ASYNC
```
    Key used when the message is sent asynchronously via push channel.
    
    See Also:
    
    Constant Field Values
  - EVENT_DATA_PHASE
```
public static final String EVENT_DATA_PHASE
```
    Key holding the debounce phase for an event data map from the client.
    
    See Also:
    
    Constant Field Values
  - EVENT_PHASE_LEADING
```
public static final String EVENT_PHASE_LEADING
```
    Character used for representing DebouncePhase.LEADING.
    
    See Also:
    
    Constant Field Values
  - EVENT_PHASE_INTERMEDIATE
```
public static final String EVENT_PHASE_INTERMEDIATE
```
    Character used for representing DebouncePhase.INTERMEDIATE.
    
    See Also:
    
    Constant Field Values
  - EVENT_PHASE_TRAILING
```
public static final String EVENT_PHASE_TRAILING
```
    Character used for representing DebouncePhase.TRAILING.
    
    See Also:
    
    Constant Field Values
  - SYNCHRONIZE_PROPERTY_TOKEN
```
public static final String SYNCHRONIZE_PROPERTY_TOKEN
```
    Token used as an event data expression to represent that properties should be synchronized. The token is chosen to avoid collisions with regular event data expressions by using a character that cannot be the start of a valid JS expression.
    
    See Also:
    
    Constant Field Values
  - MAP_STATE_NODE_EVENT_DATA
```
public static final String MAP_STATE_NODE_EVENT_DATA
```
    Token used as an event data expression or prefix to an event data expression to represent that the state node ID should be fetched for the element, or its closest parent, that corresponds to event.target or the element returned by the evaluated expression.
    The token is chosen to avoid collisions with regular event data expressions by using a character that cannot be the start of a valid JS expression.
    
    Since:
    
    9.0
    
    See Also:
    
    Constant Field Values
  - RPC_TYPE_CHANNEL
```
public static final String RPC_TYPE_CHANNEL
```
    RPC type value used for return channel messages.
    
    See Also:
    
    Constant Field Values
  - RPC_CHANNEL
```
public static final String RPC_CHANNEL
```
    Key for the channel id in return channel messages.
    
    See Also:
    
    Constant Field Values
  - RPC_CHANNEL_ARGUMENTS
```
public static final String RPC_CHANNEL_ARGUMENTS
```
    Key for the arguments array in return channel messages.
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - JsonConstants
```
public JsonConstants()
```

Class JsonConstants

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

JSON_CONTENT_TYPE

CHANGE_NODE

CHANGE_TYPE

CHANGE_TYPE_NOOP

CHANGE_TYPE_ATTACH

CHANGE_TYPE_DETACH

CHANGE_TYPE_SPLICE

CHANGE_TYPE_PUT

CHANGE_TYPE_REMOVE

CHANGE_TYPE_CLEAR

CHANGE_FEATURE

CHANGE_FEATURE_TYPE

CHANGE_MAP_KEY

CHANGE_SPLICE_ADD_NODES

CHANGE_SPLICE_ADD

CHANGE_SPLICE_REMOVE

CHANGE_SPLICE_INDEX

CHANGE_PUT_VALUE

CHANGE_PUT_NODE_VALUE

RPC_TYPE

RPC_TYPE_EVENT

RPC_TYPE_NAVIGATION

RPC_NODE

RPC_EVENT_TYPE

RPC_TYPE_MAP_SYNC

RPC_EVENT_DATA

UIDL_KEY_EXECUTE

RPC_FEATURE

RPC_PROPERTY

RPC_PROPERTY_VALUE

RPC_NAVIGATION_LOCATION

RPC_NAVIGATION_STATE

RPC_NAVIGATION_ROUTERLINK

RPC_PUBLISHED_SERVER_EVENT_HANDLER

RPC_TEMPLATE_EVENT_METHOD_NAME

RPC_TEMPLATE_EVENT_ARGS

RPC_TEMPLATE_EVENT_PROMISE

RPC_PROMISE_CALLBACK_NAME

RPC_ATTACH_EXISTING_ELEMENT

RPC_ATTACH_EXISTING_ELEMENT_BY_ID

RPC_ATTACH_REQUESTED_ID

RPC_ATTACH_ASSIGNED_ID

RPC_ATTACH_TAG_NAME

RPC_ATTACH_INDEX

RPC_ATTACH_ID

META_SESSION_EXPIRED

META_ASYNC

EVENT_DATA_PHASE

EVENT_PHASE_LEADING

EVENT_PHASE_INTERMEDIATE

EVENT_PHASE_TRAILING

SYNCHRONIZE_PROPERTY_TOKEN

MAP_STATE_NODE_EVENT_DATA

RPC_TYPE_CHANNEL

RPC_CHANNEL

RPC_CHANNEL_ARGUMENTS

Constructor Detail

JsonConstants