JSDNDEvent

Overview

The JSDNDEvent object is designed for use in drag-and-drop callback functions, offering detailed event information and support for client-server interaction. It integrates deeply with event management in scripting environments. ## Overview

Key Features

• Constants for identifying event types (ONDRAG, ONDROP, etc.) and modifiers (MODIFIER_ALT, MODIFIER_SHIFT).

• Properties such as data and dataMimeType to handle event-specific data transfer.

• Methods for retrieving event details, such as getDragResult(), getType(), and positional data (getX(), getY()).

Advanced Usage

The JSDNDEventType class facilitates JSON conversion for events in browser contexts. It ensures that events with a source are correctly handled, mapping them to client-side representations using a WeakHashMap for efficient reference management.

Constants Summarized

Type	Name	Summary
String	ACTION	Constant returned by JSEvent.
String	DATACHANGE	Constant returned by JSEvent.
String	DOUBLECLICK	Constant returned by JSEvent.
String	FOCUSGAINED	Constant returned by JSEvent.
String	FOCUSLOST	Constant returned by JSEvent.
String	FORM	Constant returned by JSEvent.
Number	MODIFIER_ALT	Constant for the ALT modifier that can be returned by JSDNDEvent.
Number	MODIFIER_CTRL	Constant for the CTRL modifier that can be returned by JSDNDEvent.
Number	MODIFIER_META	Constant for the META modifier that can be returned by JSDNDEvent.
Number	MODIFIER_SHIFT	Constant for the SHIFT modifier that can be returned by JSDNDEvent.
String	NONE	Constant returned by JSEvent.
String	ONDRAG	Constant returned by JSDNDEvent.
String	ONDRAGEND	Constant returned by JSDNDEvent.
String	ONDRAGOVER	Constant returned by JSDNDEvent.
String	ONDROP	Constant returned by JSDNDEvent.
String	RIGHTCLICK	Constant returned by JSEvent.

Properties Summarized

Type	Name	Summary
Object	data	A data object that specific events can set, a user can set data back to the system for events that supports this.
String	dataMimeType	The event data mime type.

Methods Summarized

Type	Name	Summary
Number	getDragResult()	Returns the result of the drag action.
String	getElementName()	returns the name of the element, can be null if the form was the source of the event.
String	getFormName()	returns the name of the form the element was placed on.
Number	getModifiers()	Returns the modifiers of the event, see JSDNDEvent.
String	getName()	Returns the name of the event which was triggered
JSRecord	getRecord()	Returns the record of the event.
Object	getSource()	returns the source component/element of the event.
Date	getTimestamp()	Returns the time the event occurred.
String	getType()	returns the dnd event type see the JSDNDEvents constants what it can return.
Number	getX()	Returns the x position of the event, relative to the component that fired it, if applicable.
Number	getY()	Returns the y position of the event, relative to the component that fired it, if applicable.

Constants Detailed

ACTION

Constant returned by JSEvent.getType() in a method that is attached to an onAction event.

Type String

Sample

if (event.getType() == JSEvent.ACTION)
{
	// its an action event.
}

DATACHANGE

Constant returned by JSEvent.getType() in a method that is attached to an onDataChange event.

Type String

Sample

if (event.getType() == JSEvent.DATACHANGE)
{
	// its a data change event
}

DOUBLECLICK

Constant returned by JSEvent.getType() in a method that is attached to an onDoubleClick event.

Type String

Sample

if (event.getType() == JSEvent.DOUBLECLICK)
{
	// its a double click event.
}

FOCUSGAINED

Constant returned by JSEvent.getType() in a method that is attached to an onFocusGained or the forms onElementFocusGained event.

Type String

Sample

if (event.getType() == JSEvent.FOCUSGAINED)
{
	// its a focus gained event.
}

FOCUSLOST

Constant returned by JSEvent.getType() in a method that is attached to an onFocusLost or the forms onElementFocusLost event.

Type String

Sample

if (event.getType() == JSEvent.FOCUSLOST)
{
	// its a focus lost event.
}

FORM

Constant returned by JSEvent.getType() in a method that is attached to a form event (like onShow) or command (like onDeleteRecord)

Type String

Sample

if (event.getType() == JSEvent.FORM)
{
	// its a form event or command
}

MODIFIER_ALT

Constant for the ALT modifier that can be returned by JSDNDEvent.getModifiers();

Type Number

Sample

//test if the SHIFT modifier is used.
if (event.getModifiers() & JSDNDEvent.MODIFIER_SHIFT)
{
	//do shift action
}

MODIFIER_CTRL

Constant for the CTRL modifier that can be returned by JSDNDEvent.getModifiers();

Type Number

Sample

//test if the SHIFT modifier is used.
if (event.getModifiers() & JSDNDEvent.MODIFIER_SHIFT)
{
	//do shift action
}

MODIFIER_META

Constant for the META modifier that can be returned by JSDNDEvent.getModifiers();

Type Number

Sample

//test if the SHIFT modifier is used.
if (event.getModifiers() & JSDNDEvent.MODIFIER_SHIFT)
{
	//do shift action
}

MODIFIER_SHIFT

Constant for the SHIFT modifier that can be returned by JSDNDEvent.getModifiers();

Type Number

Sample

//test if the SHIFT modifier is used.
if (event.getModifiers() & JSDNDEvent.MODIFIER_SHIFT)
{
	//do shift action
}

NONE

Constant returned by JSEvent.getType() if the event is not used in a known event or command.

Type String

Sample

if (event.getType() == JSEvent.NONE)
{
	// type is not set.
}

ONDRAG

Constant returned by JSDNDEvent.getType() in a method that is attached to an onDrag event.

Type String

Sample

if (event.getType() == JSDNDEvent.ONDRAG)
{
	// its an ondrag event
	if (event.getElementName() == 'todragelement')
		return DRAGNDROP.COPY
}

ONDRAGEND

Constant returned by JSDNDEvent.getType() in a method that is attached to an onDragEnd event.

Type String

Sample

if (event.getType() == JSDNDEvent.ONDRAGEND)
{
	// its an on drag end event.
	// return true if the drop has been completed successfully
	return event.isDropSuccess();
}

ONDRAGOVER

Constant returned by JSDNDEvent.getType() in a method that is attached to an onDragOver event.

Type String

Sample

if (event.getType() == JSDNDEvent.ONDRAGOVER)
{
	// its an on drag over event.
	// return true if it over the right element.
	return event.getElementName() == 'candroponelement';
}

ONDROP

Constant returned by JSDNDEvent.getType() in a method that is attached to an onDrop event.

Type String

Sample

if (event.getType() == JSDNDEvent.ONDROP)
{
	// its a on drop event.
	var element = elements[event.getElementName()];
	// do drop on element
	return true;
}

RIGHTCLICK

Constant returned by JSEvent.getType() in a method that is attached to an onRightClick event.

Type String

Sample

if (event.getType() == JSEvent.RIGHTCLICK)
{
	// its a right click event.
}

Properties Detailed

data

A data object that specific events can set, a user can set data back to the system for events that supports this.

Type Object

Sample

// A client design method that handles ondrag
if (event.getType() == JSEvent.ONDRAG)
{
     // the data is the selected elements array
     var elements = event.data;
     // only start a client design drag when there is 1 element
     if (elements.length == 1)
     {
     	return true;
     }
}

// code for a data drag method
event.data = "drag me!";
return DRAGNDROP.COPY;

// code for a data drop method
var data = event.data;
elements[event.getElementName()].setText(data);
return true;

dataMimeType

The event data mime type.

Type String

Sample

// only accept drag if data is a servoy record
function onDragOver(event)
{
	if(event.dataMimeType.indexOf("application/x-servoy-record-object") == 0) return true;
	else return false;
}

Methods Detailed

getDragResult()

Returns the result of the drag action.

Returns: Number a DRAGNDROP constant, representing the result of the drag action

Sample

function onDragEnd(event)
{
	var dragResult = event.getDragResult();
	if(dragResult == DRAGNDROP.NONE)
	{
		// the drag was canceled
	}
	else if(dragResult == DRAGNDROP.COPY)
	{
		// the drag ended with a copy action
	}
	else if(dragResult == DRAGNDROP.MOVE)
	{
		// the drag ended with a move action
	}
}

getElementName()

returns the name of the element, can be null if the form was the source of the event.

Returns: String a String representing the element name.

Sample

if (event.getElementName() == 'myElement')
{
    elements[event.getElementName()].bgcolor = '#ff0000';
}

getFormName()

returns the name of the form the element was placed on.

Returns: String a String representing the form name.

Sample

forms[event.getFormName()].myFormMethod();

getModifiers()

Returns the modifiers of the event, see JSDNDEvent.MODIFIER_XXXX for the modifiers that can be returned.

Returns: Number an int which holds the modifiers as a bitset.

Sample

//test if the SHIFT modifier is used.
if (event.getModifiers() & JSDNDEvent.MODIFIER_SHIFT)
{
	//do shift action
}

getName()

Returns the name of the event which was triggered

Returns: String name of event as string

Sample

var name = event.getName();

getRecord()

Returns the record of the event.

Returns: JSRecord Record of the event

Sample

event.Record();

getSource()

returns the source component/element of the event. If it has a name the getElementName() is the name of this component.

Returns: Object an Object representing the source of this event.

Sample

// cast to runtime text field (change to anoter kind of type if you know the type)
/** @type {RuntimeTextField} */
var source = event.getSource();
var sourceDataProvider = source.getDataProviderID();

getTimestamp()

Returns the time the event occurred.

Returns: Date a Date when this event happened.

Sample

event.getTimestamp();

getType()

returns the dnd event type see the JSDNDEvents constants what it can return.

Returns: String a String representing the type of this event.

Sample

if (event.getType() == JSDNDEvent.ONDROP)
{
	// it's a drop
}

getX()

Returns the x position of the event, relative to the component that fired it, if applicable. For example drag'n'drop events will set the x,y positions.

Returns: Number an int representing the X position.

Sample

var x = event.getX();
var xPrevious = previousEvent.getX();
var movedXPixels = x -xPrevious;

getY()

Returns the y position of the event, relative to the component that fired it, if applicable. For example drag'n'drop events will set the x,y positions.

Returns: Number an int representing the Y position.

Sample

var y = event.getY();
var yPrevious = previousEvent.getY();
var movedYPixels = y -yPrevious;

---