Drag and Drop

This is a multi-purpose HTML drag and drop tool. To use it, call new DraggableObject(element), then implement customMouseMove and customMouseUp functions on the returned object.

Example: drag an element around the screen

This code allows you to place things at any point on the screen. In most cases the tag in question should be a child of document.body, with absolute positioning. If you want to use fixed positioning (ie. the tag stays put if the user scrolls), set d.fixed = true.

var tag = document.getElementById("tag");
var d = new DraggableObject(tag);
d.customMouseMove = function(event) {
	// dragStart[XY] is position relative to tag at the start of dragging
	// event.page[XY] is current position, relative to the top left corner of the page
	var left = event.pageX - this.dragStartX;
	var top = event.pageY - this.dragStartY;

	// this.domNode is a reference to tag
	// this code assumes tag has absolute positioning
	this.domNode.style.left = left + "px";
	this.domNode.style.top = top + "px";
};
d.customMouseUp = function(event) {
	// this will tell you exactly where the mouse was when you released the button
	alert([event.pageX, event.pageY]);
};