This article describes the method of JavaScript to implement the drag-and-drop function of web page objects. Share it for your reference. The details are as follows:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http:///TR/html4/">
<html>
<head>
<title>Drag</title>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<style>
#myDiv{width:50px; height:50px; background-color:red}
</style>
</head>
<body>
<div ></div>
</body>
<script type="text/javascript">
var isIE = ? true : false;
//Judge whether it is IE browser function addEventHandler(oTarget, sEventType, fnHandler){
//Add event if(){
(sEventType, fnHandler, false);
}else if(){
("on" + sEventType, fnHandler);
}else{
oTarget["on" + sEventType] = fnHandler;
}
}
function removeEventHandler(oTarget, sEventType, fnHandler) {
//Remove event if () {
(sEventType, fnHandler, false);
} else if () {
("on" + sEventType, fnHandler);
} else {
oTarget["on" + sEventType] = null;
}
}
var BindAsEventListener = function(object, fun) {
//Replace the current object with another object return function(event) {
return (object, (event || ));
}
}
var $ = function(id){
return (id);
}
var Class = {
create: function() {
return function() {(this, arguments);}
}
}
var drag = ();
= {
initialize: function(id){//initialization this._drag = $(id);
this._flag = false;
addEventHandler(this._drag,'mousedown',BindAsEventListener(this,));
this._fM = BindAsEventListener(this, );
this._fS = BindAsEventListener(this, );
this._drag. = "absolute";
},
start: function(oEvent){//Equivalent to onmousedown event //return this._name;
this._x = - this._drag.offsetLeft;
this._y = - this._drag.offsetTop;
addEventHandler(document, 'mousemove', this._fM);
addEventHandler(document, 'mouseup', this._fS);
if(isIE){
addEventHandler(this._drag, "losecapture", this._fS);
//The focus is lost this._Handle.setCapture();//Set mouse capture }else{
addEventHandler(window, "blur", this._fS);//The focus is lost ();//Block default action }
},
move: function(oEvent){ //Equivalent to onmonusemove event this._drag. = - this._x + "px";
this._drag. = - this._y + "px";
},
stop: function(){ //Equivalent to onmouseup event removeEventHandler(document, 'mousemove', this._fM);
removeEventHandler(document, 'mouseup', this._fS);
if(isIE){
removeEventHandler(this._drag, "losecapture", this._fS);
this._Handle.releaseCapture();
}else{
removeEventHandler(window, "blur", this._fS);
}
}
}
var ndrag = new drag("myDiv");
</script>
</html>
I hope this article will be helpful to everyone's JavaScript programming.