index.js
function Draggable(target, options) {
	if (!(this instanceof Draggable)) {
		return new Draggable(target, options);
	}

	var that = this;

	//ignore existing instance
	var instance = draggableCache.get(target);
	if (instance) {
		instance.state = 'reset';

		//take over options
		extend(instance, options);

		instance.update();

		return instance;
	}

	else {
		//get unique id for instance
		//needed to track event binders
		that.id = getUid();
		that._ns = '.draggy_' + that.id;

		//save element passed
		that.element = target;

		draggableCache.set(target, that);
	}

	//define state behaviour
	defineState(that, 'state', that.state);

	//preset handles
	that.currentHandles = [];

	//take over options
	extend(that, options);

	//define handle
	if (that.handle === undefined) {
		that.handle = that.element;
	}

	//setup droppable
	if (that.droppable) {
		that.initDroppable();
	}

	//try to calc out basic limits
	that.update();

	//go to initial state
	that.state = 'idle';
}
function Draggable(target, options) {
	if (!(this instanceof Draggable)) {
		return new Draggable(target, options);
	}

	var that = this;

	//ignore existing instance
	var instance = draggableCache.get(target);
	if (instance) {
		instance.state = 'reset';

		//take over options
		extend(instance, options);

		instance.update();

		return instance;
	}

	else {
		//get unique id for instance
		//needed to track event binders
		that.id = getUid();
		that._ns = '.draggy_' + that.id;

		//save element passed
		that.element = target;

		draggableCache.set(target, that);
	}

	//define state behaviour
	defineState(that, 'state', that.state);

	//preset handles
	that.currentHandles = [];

	//take over options
	extend(that, options);

	//define handle
	if (that.handle === undefined) {
		that.handle = that.element;
	}

	//setup droppable
	if (that.droppable) {
		that.initDroppable();
	}

	//try to calc out basic limits
	that.update();

	//go to initial state
	that.state = 'idle';
}
function Draggable ( target , options ) { if ( ! ( this instanceof Draggable ) ) { return new Draggable ( target , options ) ; } var that = this ; //ignore existing instance var instance = draggableCache . get ( target ) ; if ( instance ) { instance . state = 'reset' ; //take over options extend ( instance , options ) ; instance . update ( ) ; return instance ; } else { //get unique id for instance //needed to track event binders that . id = getUid ( ) ; that . _ns = '.draggy_' + that . id ; //save element passed that . element = target ; draggableCache . set ( target , that ) ; } //define state behaviour defineState ( that , 'state' , that . state ) ; //preset handles that . currentHandles = [ ] ; //take over options extend ( that , options ) ; //define handle if ( that . handle === undefined ) { that . handle = that . element ; } //setup droppable if ( that . droppable ) { that . initDroppable ( ) ; } //try to calc out basic limits that . update ( ) ; //go to initial state that . state = 'idle' ; }
Make an element draggable.

@constructor

@param {HTMLElement} target An element whether in/out of DOM
@param {Object} options An draggable options

@return {HTMLElement} Target element
Make an element draggable .