web前端|js教程
js拖动层
web前端-js教程
实例代码一见：
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#main div{position:absolute;width:220px;height:150px;border:1px solid #999;}
var a;
document.onmouseup = function() {
if (!a) return;
a = "";
};
document.onmousemove = function(d) {
if (!a) return;
d=d||event;
a.style.left = (d.clientX - b) + "px";
a.style.top = (d.clientY - c) + "px";
};
function $(o, e) {
a = o;
b = e.clientX - parseInt(a.style.left);
c = e.clientY - parseInt(a.style.top);
}
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效果：
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#main div{position:absolute;width:220px;height:150px;border:1px solid #999;}
var a; document.onmouseup = function() { if (!a) return; a = “”; }; document.onmousemove = function(d) { if (!a) return; d=d||event; a.style.left = (d.clientX – b) + “px”; a.style.top = (d.clientY – c) + “px”; }; function $(o, e) { a = o; b = e.clientX – parseInt(a.style.left); c = e.clientY – parseInt(a.style.top); }
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[Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]实例代码二见：
#test{width:200px; height:200px; background:pink; cursor:move; position:absolute; left:100px; top:100px}
var obj=document.getElementById("test");
var b;
obj.onmousedown=function(e){
b=true;
var divLeft=parseFloat(window.getComputedStyle?window.getComputedStyle(obj,null).left:obj.currentStyle.left);
var divTop=parseFloat(window.getComputedStyle?window.getComputedStyle(obj,null).top:obj.currentStyle.top);
var e=e||event;
var divX=e.clientX-divLeft; //计算鼠标和div边框的距离
var divY=e.clientY-divTop;
document.onmousemove=function(e){
if(b){
var e=e||event; //兼容IE8及以下
obj.style.left=e.clientX-divX+"px";
obj.style.top=e.clientY-divY+"px";
}
}
}
document.onmouseup=function(){
b=false;
}
效果：
var obj=document.getElementById(“test”); var b; obj.onmousedown=function(e){ b=true; var divLeft=parseFloat(window.getComputedStyle?window.getComputedStyle(obj,null).left:obj.currentStyle.left); var divTop=parseFloat(window.getComputedStyle?window.getComputedStyle(obj,null).top:obj.currentStyle.top); var e=e||event; var divX=e.clientX-divLeft; //计算鼠标和div边框的距离 var divY=e.clientY-divTop; document.onmousemove=function(e){ if(b){ var e=e||event; //兼容IE8及以下 obj.style.left=e.clientX-divX+”px”; obj.style.top=e.clientY-divY+”px”; } } } document.onmouseup=function(){ b=false; }
[Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]实例代码三见（拖动把柄）：
在这里才能移动
var obj=document.getElementById(“test”); var objBox=document.getElementById(“testBox”); var b; obj.onmousedown=function(e){ b=true; var divLeft=parseFloat(window.getComputedStyle?window.getComputedStyle(objBox,null).left:objBox.currentStyle.left); var divTop=parseFloat(window.getComputedStyle?window.getComputedStyle(objBox,null).top:objBox.currentStyle.top); var e=e||event; var divX=e.clientX-divLeft; //计算鼠标和div边框的距离 var divY=e.clientY-divTop; document.onmousemove=function(e){ if(b){ var e=e||event; //IE8及以下浏览器得写这句 objBox.style.left=e.clientX-divX+”px”; objBox.style.top=e.clientY-divY+”px”; } } } document.onmouseup=function(){ b=false; }
[Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]
