拖拽 縮放
阿新 • • 發佈：2018-11-11
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
#da{
width:300px;
height:300px;
position:relative;
border:1px solid red;
}
#tuo{
cursor:nw-resize;
position:absolute;
right:0px;
bottom:0px;
width:15px;
height:15px;
z-index:3;
}
</style>
</head>
<body>
<div id="da" style="left: 385px; top: 49px; width: 745px; height: 323px;">
<div id="tuo"></div>
</div>
<script>
var tuo=document.getElementById("tuo");
var da=document.getElementById("da");
var mouseStart={};
var divStart={};
//往左右同時拽 右下角拖動
tuo.onmousedown=function(ev)
{
var oEvent=ev||event; //瀏覽器相容
mouseStart.x=oEvent.clientX; //拖動前的x，y值 當前的位置
mouseStart.y=oEvent.clientY;
divStart.x=tuo.offsetLeft; //左側和頂部的距離
divStart.y=tuo.offsetTop;
if(tuo.setCapture) //判斷是不是滑鼠事件
{
tuo.onmousemove=doDrag; //滑鼠事件是 滑鼠按下時
tuo.onmouseup=stopDrag; //滑鼠事件是 滑鼠擡起
tuo.setCapture();
}
else
{
document.addEventListener("mousemove",doDrag,true);
document.addEventListener("mouseup",stopDrag,true);
}
};
function doDrag(ev)
{
var oEvent=ev||event;
var l=oEvent.clientX-mouseStart.x+divStart.x; //當前的寬
var t=oEvent.clientY-mouseStart.y+divStart.y; //當前的高
var w=l+tuo.offsetWidth; //offsetWidth拖拉圖表的寬
var h=t+tuo.offsetHeight;
if( w < tuo.offsetWidth)
{
w=tuo.offsetWidth;
}
else if(w>document.documentElement.clientWidth-da.offsetLeft)
{
w=document.documentElement.clientWidth-da.offsetLeft-2;
}
if(h<tuo.offsetHeight)
{
h=tuo.offsetHeight;
}
else if(h>document.documentElement.clientHeight-da.offsetTop)
{
h=document.documentElement.clientHeight-da.offsetTop-2;
}
da.style.width=w+"px";
da.style.height=h+"px";
};
function stopDrag()
{
if(tuo.releaseCapture)
{
tuo.onmousemove=null;
tuo.onmouseup=null;
tuo.releaseCapture();
}
else
{
document.removeEventListener("mousemove",doDrag,true);
document.removeEventListener("mouseup",stopDrag,true);
}
};
//拖拽
da.ondblclick=function(ev)
{
var oEvent=ev||event;
mouseStart.x=oEvent.clientX;
mouseStart.y=oEvent.clientY;
divStart.x=da.offsetLeft;
divStart.y=da.offsetTop;
if(da.setCapture)
{
da.onmousemove=doDrag3;
da.onmouseup=stopDrag3;
da.setCapture();
}
else
{
document.addEventListener("mousemove",doDrag3,true);
document.addEventListener("mouseup",stopDrag3,true);
}
};
function doDrag3(ev)
{
var oEvent=ev||event;
var l=oEvent.clientX-mouseStart.x+divStart.x;
var t=oEvent.clientY-mouseStart.y+divStart.y;
if( l < 0)
{
l=0;
}
else if(l>document.documentElement.clientWidth-da.offsetWidth)
{
l=document.documentElement.clientWidth-da.offsetWidth;
}
if(t < 0)
{
t=0;
}
else if(t>document.documentElement.clientHeight-da.offsetHeight)
{
t=document.documentElement.clientHeight-da.offsetHeight;
}
da.style.left=l+"px";
da.style.top=t+"px";
};
function stopDrag3()
{
if(da.releaseCapture)
{
da.onmousemove=null;
da.onmouseup=null;
da.releaseCapture();
}
else
{
document.removeEventListener("mousemove",doDrag3,true);
document.removeEventListener("mouseup",stopDrag3,true);
}
}
</script>
</body>
</html>