拖动鼠标改变div层的大小宽度

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拖动鼠标改变div层的大小宽度

作者:admin 发布时间:2010-10-25 5:42:34 发布人: admin

<html>

<head>
<title>拖动鼠标改变div层的大小宽度丨网页特效丨myjs.jz123.Cn</title>
<meta content="text/html; charset=gb2312" http-equiv="Content-Type">
<style> {
 box-sizing: border-box; moz-box-sizing: border-box
}
#testDiv     { background-color: buttonface; background-repeat: repeat; 
               background-attachment: scroll; color: #3969A5; height: 300px; 
               left: 30px; overflow: hidden; width: 500; z-index: 2; 
               border: 2px outset white; margin: 0px; padding: 2px; 
               background-position: 0% 50% }
body         { font-family: Verdana; font-size: 9pt }
#innerNice   { background-color: white; background-repeat: repeat; background-attachment: 
               scroll; color: #3969A5; height: 100%; overflow: auto; width: 
               100%; border: 2px inset white; padding: 8px; 
               background-position: 0% 50% }
</style>

var theobject = null; //This gets a value as soon as a resize start

function resizeObject() {
 this.el        = null; //pointer to the object
 this.dir    = "";      //type of current resize (n, s, e, w, ne, nw, se, sw)
 this.grabx = null;     //Some useful values
 this.graby = null;
 this.width = null;
 this.height = null;
 this.left = null;
 this.top = null;
}

//Find out what kind of resize! Return a string inlcluding the directions
function getDirection(el) {
 var xPos, yPos, offset, dir;
 dir = "";

xPos = window.event.offsetX;
 yPos = window.event.offsetY;

offset = 8; //The distance from the edge in pixels

if (yPos<offset) dir += "n";
 else if (yPos > el.offsetHeight-offset) dir += "s";
 if (xPos<offset) dir += "w";
 else if (xPos > el.offsetWidth-offset) dir += "e";

return dir;
}

function doDown() {
 var el = getReal(event.srcElement, "className", "resizeMe");

if (el == null) {
  theobject = null;
  return;
 }

dir = getDirection(el);
 if (dir == "") return;

theobject = new resizeObject();
  
 theobject.el = el;
 theobject.dir = dir;

theobject.grabx = window.event.clientX;
 theobject.graby = window.event.clientY;
 theobject.width = el.offsetWidth;
 theobject.height = el.offsetHeight;
 theobject.left = el.offsetLeft;
 theobject.top = el.offsetTop;

window.event.returnValue = false;
 window.event.cancelBubble = true;
}

function doUp() {
 if (theobject != null) {
  theobject = null;
 }
}

function doMove() {
 var el, xPos, yPos, str, xMin, yMin;
 xMin = 8; //The smallest width possible
 yMin = 8; //             height

el = getReal(event.srcElement, "className", "resizeMe");

if (el.className == "resizeMe") {
  str = getDirection(el);
 //Fix the cursor 
  if (str == "") str = "default";
  else str += "-resize";
  el.style.cursor = str;
 }
 
//Dragging starts here
 if(theobject != null) {
  if (dir.indexOf("e") != -1)
   theobject.el.style.width = Math.max(xMin, theobject.width + window.event.clientX - theobject.grabx) + "px";
 
  if (dir.indexOf("s") != -1)
   theobject.el.style.height = Math.max(yMin, theobject.height + window.event.clientY - theobject.graby) + "px";

if (dir.indexOf("w") != -1) {
   theobject.el.style.left = Math.min(theobject.left + window.event.clientX - theobject.grabx, theobject.left + theobject.width - xMin) + "px";
   theobject.el.style.width = Math.max(xMin, theobject.width - window.event.clientX + theobject.grabx) + "px";
  }
  if (dir.indexOf("n") != -1) {
   theobject.el.style.top = Math.min(theobject.top + window.event.clientY - theobject.graby, theobject.top + theobject.height - yMin) + "px";
   theobject.el.style.height = Math.max(yMin, theobject.height - window.event.clientY + theobject.graby) + "px";
  }
  
  window.event.returnValue = false;
  window.event.cancelBubble = true;
 } 
}

document.onmousedown = doDown;
document.onmouseup   = doUp;
document.onmousemove = doMove;
</script>

<body>

<div class="resizeMe" id="testDiv">
  <div id="innerNice">
    <p align="center">　</p>
    <p align="center">
请在边框处拖动鼠标
    <p>　</p>
    <p>　</p>
    <p>　</p>
  </div>
</div>
</body>
</html>

拖动鼠标改变div层的大小宽度

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