js拖拽的例子

本文介绍了一种使用JavaScript实现网页元素拖拽效果的方法。通过监听鼠标事件并计算元素位置,可以使div等HTML元素在页面上自由移动。此外,还提供了一个初始化函数来设置可拖动的元素列表。

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<html>
<head>
<style>
<!--
.rob
{width:200px;height:200px;background:#abcabc;border:2px;position:absolute;border-color:#666666}
.child
{width:200px;height:30px;background:#bad;border:1px;}
-->
</style>
<script type="text/javascript">
function $(id){
    
return document.getElementById(id);
}
var obj_DragAndDrap = new Object();
obj_DragAndDrap 
= {
    top:
0,
    left:
0,
    dragedElement:
null,
    z_Index:
0,
    draglist:
null,
    dragstart:
function(e){
        
var event = window.event || e;
        
if(event.srcElement){
            obj_DragAndDrap.dragedElement 
= event.srcElement;
        }
else{
            obj_DragAndDrap.dragedElement 
= event.target;
        }
        
while(obj_DragAndDrap.tagName != "BODY"){
            
if(obj_DragAndDrap.isInArray(obj_DragAndDrap.draglist,obj_DragAndDrap.dragedElement)){
                
break;
            }
else{
                obj_DragAndDrap.dragedElement 
= obj_DragAndDrap.dragedElement.parentNode;
            }
        }
        obj_DragAndDrap.dragedElement.style.top 
= (obj_DragAndDrap.dragedElement.style.top)?obj_DragAndDrap.dragedElement.style.top : 0;
        obj_DragAndDrap.dragedElement.style.left 
= (obj_DragAndDrap.dragedElement.style.left)?obj_DragAndDrap.dragedElement.style.left : 0;
        obj_DragAndDrap.dragedElement.style.position 
= "absolute";
        obj_DragAndDrap.top 
= parseInt(obj_DragAndDrap.dragedElement.style.top) - event.clientY;
        obj_DragAndDrap.left 
= parseInt(obj_DragAndDrap.dragedElement.style.left) - event.clientX;
        obj_DragAndDrap.dragedElement.style.zIndex 
= obj_DragAndDrap.z_Index+1;
        obj_DragAndDrap.z_Index
++;
        obj_DragAndDrap.dragedElement.onmousemove 
= obj_DragAndDrap.draging;
        obj_DragAndDrap.dragedElement.onmouseup 
= obj_DragAndDrap.dragend;
        obj_DragAndDrap.dragedElement.onmouseout 
= obj_DragAndDrap.dragend;
    },
    draging:
function(e){
        
var event = window.event || e;
            obj_DragAndDrap.dragedElement.style.top 
= obj_DragAndDrap.top + event.clientY +"px";
            obj_DragAndDrap.dragedElement.style.left 
= obj_DragAndDrap.left + event.clientX +"px";
    },
    dragend:
function(e){
        obj_DragAndDrap.dragedElement.onmousemove 
= obj_DragAndDrap.noDrag;
        obj_DragAndDrap.dragedElement.onmouseup 
= obj_DragAndDrap.noDrag;
        obj_DragAndDrap.dragedElement.onmouseout 
= obj_DragAndDrap.noDrag;
        obj_DragAndDrap.top 
= 0;
        obj_DragAndDrap.left 
= 0;
    },
    draginit:
function(draglist){
        
try{
            
for(var i=0; i<draglist.length;i++){
                draglist[i].onmousedown 
= obj_DragAndDrap.dragstart;
            }
            obj_DragAndDrap.draglist 
= draglist;
        }
catch(exp){}
    },
    noDrag:
function(){
        
return false;
    },
    isInArray:
function(arr,ele){
        
for(var i=0 ; i < arr.length ; i++){
            
if(arr[i] == ele){
                
return true;
            }
        }
        
return false;
    }
}
function pageload(){
    
var dragment = document.getElementsByTagName("div");
    
var draglist = new Array();
    
for(var i=0;i<dragment.length;i++){
            draglist.push(dragment[i]);
    }
    
//draglist.push($("image"));
    obj_DragAndDrap.draginit(draglist);
}
 
</script>
</head>
<body onload="pageload()">
<div id="father1" class="rob" style="left:0px;top:0px">
    
<div class="child"></div>
</div>
<div id="father2" class="rob" style="left:200px;top:0px">
    
<div class="child"></div>
</div>
<div>
<img id="image" src="http://photo8.yupoo.com/20070504/023058_781786965.jpg" unselectable="on" style="border:0px;" />
</div>
</body>
</html> 
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