Drag and drop without JQuery UI

Question

I searched a lot to find a tutorial for drag & drop with jQuery alone (without UI), but due to the popularity of JQuery UI, all drag and drop features are based on JQuer

Answer 1

Answer based on: https://www.sanwebe.com/2014/10/draggable-element-with-jquery-no-jquery-ui

for sorting perhaps see: http://johnny.github.io/jquery-sortable/

var draggable = $('#dragit'); //element 

draggable.on('mousedown', function(e){
	var dr = $(this).addClass("drag").css("cursor","move");
	height = dr.outerHeight();
	width = dr.outerWidth();
	ypos = dr.offset().top + height - e.pageY,
	xpos = dr.offset().left + width - e.pageX;
	$(document.body).on('mousemove', function(e){
		var itop = e.pageY + ypos - height;
		var ileft = e.pageX + xpos - width;
		if(dr.hasClass("drag")){
			dr.offset({top: itop,left: ileft});
		}
	}).on('mouseup', function(e){
			dr.removeClass("drag");
	});
});

#dragit
  {
    background: red;
    width: 50px;
    height: 50px;
    cursor: move;
    position: relative;
  }

Drag me

Constrain movement

var draggable = $('#dragit-contained'); //element 

draggable.on('mousedown', function(e){
	var dr = $(this).addClass("drag").css("cursor","move");
	height = dr.outerHeight();
	width = dr.outerWidth();
	max_left = dr.parent().offset().left + dr.parent().width() - dr.width();
	max_top = dr.parent().offset().top + dr.parent().height() - dr.height();
	min_left = dr.parent().offset().left;
	min_top = dr.parent().offset().top;

	ypos = dr.offset().top + height - e.pageY,
	xpos = dr.offset().left + width - e.pageX;
	$(document.body).on('mousemove', function(e){
		var itop = e.pageY + ypos - height;
		var ileft = e.pageX + xpos - width;
		
		if(dr.hasClass("drag")){
			if(itop <= min_top ) { itop = min_top; }
			if(ileft <= min_left ) { ileft = min_left; }
			if(itop >= max_top ) { itop = max_top; }
			if(ileft >= max_left ) { ileft = max_left; }
			dr.offset({ top: itop,left: ileft});
		}
	}).on('mouseup', function(e){
			dr.removeClass("drag");
	});
});

.draggable-area
  {
    background: grey;
    width: 320px;
    height: 240px;
  }
#dragit-contained
  {
    background: red;
    width: 50px;
    height: 50px;
    cursor: move;
    position: relative;
  }

	
Drag me