js实现的拖动改变窗口大小功能
分类：实例代码
本章节分享一段代码实例，它实现了通过拖动调整窗口的大小，当然也有其他功能，比如拖动窗口移动并且能够限制移动的范围等，感兴趣的朋友可以借鉴参考一下，代码实例如下:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="author" content="http://www.51texiao.cn/" />
<title>前端教程网</title>
<style type="text/css">
body, div, h2{
margin:0;
padding:0;
}
body{
font:12px/1.5 \5fae\8f6f\96c5\9ed1;
color:#333;
}
#drag{
position:absolute;
top:100px;
left:100px;
width:300px;
height:160px;
background:#e9e9e9;
border:1px solid #444;
border-radius:5px;
box-shadow:0 1px 3px 2px #666;
}
#drag .title{
position:relative;
height:27px;
margin:5px;
}
#drag .title h2{
font-size:14px;
height:27px;
line-height:24px;
border-bottom:1px solid #A1B4B0;
}
#drag .title div{
position:absolute;
height:19px;
top:2px;
right:0;
}
#drag .title a, a.open{
float:left;
width:21px;
height:19px;
display:block;
margin-left:5px;
background:url(/jscss/demoimg/201205/tool.png) no-repeat;
}
a.open {
position:absolute;
top:10px;
left:50%;
margin-left:-10px;
background-position:0 0;
}
a.open:hover{
background-position:0 -29px;
}
#drag .title a.min{
background-position:-29px 0;
}
#drag .title a.min:hover{
background-position: -29px -29px;
}
#drag .title a.max{
background-position:-60px 0;
}
#drag .title a.max:hover{
background-position:-60px -29px;
}
#drag .title a.revert{
background-position:-149px 0;
display:none;
}
#drag .title a.revert:hover{
background-position:-149px -29px;
}
#drag .title a.close{
background-position:-89px 0;
}
#drag .title a.close:hover{
background-position:-89px -29px;
}
#drag .content{
overflow:auto;
margin:0 5px;
}
#drag .resizeBR{
position:absolute;
width:14px;
height:14px;
right:0;
bottom:0;
overflow:hidden;
cursor:nw-resize;
background:url(/jscss/demoimg/201205/resize.png) no-repeat;
}
#drag .resizeL, #drag .resizeT, #drag .resizeR, #drag .resizeB, #drag .resizeLT, #drag .resizeTR, #drag .resizeLB {
position:absolute;
background:#000;
overflow:hidden;
opacity:0;
filter:alpha(opacity=0);
}
#drag .resizeL, #drag .resizeR{
top:0;
width:5px;
height:100%;
cursor:w-resize;
}
#drag .resizeR{
right:0;
}
#drag .resizeT, #drag .resizeB{
width:100%;
height:5px;
cursor:n-resize;
}
#drag .resizeT{
top:0;
}
#drag .resizeB{
bottom:0;
}
#drag .resizeLT, #drag .resizeTR, #drag .resizeLB{
width:8px;
height:8px;
background:#FF0;
}
#drag .resizeLT{
top:0;
left:0;
cursor:nw-resize;
}
#drag .resizeTR{
top:0;
right:0;
cursor:ne-resize;
}
#drag .resizeLB{
left:0;
bottom:0;
cursor:ne-resize;
}
</style>
<script type="text/javascript">
/*-------------------------- +
获取id, class, tagName
+-------------------------- */
var get = {
byId: function(id) {
return typeof id === "string" ? document.getElementById(id) : id
},
byClass: function(sClass, oParent) {
var aClass = [];
var reClass = new RegExp("(^| )" + sClass + "( |$)");
var aElem = this.byTagName("*", oParent);
for (var i = 0; i < aElem.length; i++) reClass.test(aElem[i].className) && aClass.push(aElem[i]);
return aClass
},
byTagName: function(elem, obj) {
return (obj || document).getElementsByTagName(elem)
}
};
var dragMinWidth = 250;
var dragMinHeight = 124;
/*-------------------------- +
拖拽函数
+-------------------------- */
function drag(oDrag, handle){
var disX = dixY = 0;
var oMin = get.byClass("min", oDrag)[0];
var oMax = get.byClass("max", oDrag)[0];
var oRevert = get.byClass("revert", oDrag)[0];
var oClose = get.byClass("close", oDrag)[0];
handle = handle || oDrag;
handle.style.cursor = "move";
handle.onmousedown = function (event){
var event = event || window.event;
disX = event.clientX - oDrag.offsetLeft;
disY = event.clientY - oDrag.offsetTop;
document.onmousemove = function (event){
var event = event || window.event;
var iL = event.clientX - disX;
var iT = event.clientY - disY;
var maxL = document.documentElement.clientWidth - oDrag.offsetWidth;
var maxT = document.documentElement.clientHeight - oDrag.offsetHeight;
iL <= 0 && (iL = 0);
iT <= 0 && (iT = 0);
iL >= maxL && (iL = maxL);
iT >= maxT && (iT = maxT);
oDrag.style.left = iL + "px";
oDrag.style.top = iT + "px";
return false
};
document.onmouseup = function (){
document.onmousemove = null;
document.onmouseup = null;
this.releaseCapture && this.releaseCapture()
};
this.setCapture && this.setCapture();
return false
};
//最大化按钮
oMax.onclick = function (){
oDrag.style.top = oDrag.style.left = 0;
oDrag.style.width = document.documentElement.clientWidth - 2 + "px";
oDrag.style.height = document.documentElement.clientHeight - 2 + "px";
this.style.display = "none";
oRevert.style.display = "block";
};
//还原按钮
oRevert.onclick = function (){
oDrag.style.width = dragMinWidth + "px";
oDrag.style.height = dragMinHeight + "px";
oDrag.style.left = (document.documentElement.clientWidth - oDrag.offsetWidth) / 2 + "px";
oDrag.style.top = (document.documentElement.clientHeight - oDrag.offsetHeight) / 2 + "px";
this.style.display = "none";
oMax.style.display = "block";
};
//最小化按钮
oMin.onclick = oClose.onclick = function (){
oDrag.style.display = "none";
var oA = document.createElement("a");
oA.className = "open";
oA.href = "javascript:;";
oA.title = "还原";
document.body.appendChild(oA);
oA.onclick = function (){
oDrag.style.display = "block";
document.body.removeChild(this);
this.onclick = null;
};
};
//阻止冒泡
oMin.onmousedown = oMax.onmousedown = oClose.onmousedown = function (event){
this.onfocus = function () {this.blur()};
(event || window.event).cancelBubble = true
};
}
/*-------------------------- +
改变大小函数
+-------------------------- */
function resize(oParent, handle, isLeft, isTop, lockX, lockY){
handle.onmousedown = function (event){
var event = event || window.event;
var disX = event.clientX - handle.offsetLeft;
var disY = event.clientY - handle.offsetTop;
var iParentTop = oParent.offsetTop;
var iParentLeft = oParent.offsetLeft;
var iParentWidth = oParent.offsetWidth;
var iParentHeight = oParent.offsetHeight;
document.onmousemove = function (event){
var event = event || window.event;
var iL = event.clientX - disX;
var iT = event.clientY - disY;
var maxW = document.documentElement.clientWidth - oParent.offsetLeft - 2;
var maxH = document.documentElement.clientHeight - oParent.offsetTop - 2;
var iW = isLeft ? iParentWidth - iL :
handle.offsetWidth + iL;
var iH = isTop ? iParentHeight - iT : handle.offsetHeight + iT;
isLeft && (oParent.style.left = iParentLeft + iL + "px");
isTop && (oParent.style.top = iParentTop + iT + "px");
iW < dragMinWidth && (iW = dragMinWidth);
iW > maxW && (iW = maxW);
lockX || (oParent.style.width = iW + "px");
iH < dragMinHeight && (iH = dragMinHeight);
iH > maxH && (iH = maxH);
lockY || (oParent.style.height = iH + "px");
if((isLeft && iW == dragMinWidth) || (isTop && iH == dragMinHeight)) document.onmousemove = null;
return false;
};
document.onmouseup = function (){
document.onmousemove = null;
document.onmouseup = null;
};
return false;
}
};
window.onload = window.onresize = function (){
var oDrag = document.getElementById("drag");
var oTitle = get.byClass("title", oDrag)[0];
var oL = get.byClass("resizeL", oDrag)[0];
var oT = get.byClass("resizeT", oDrag)[0];
var oR = get.byClass("resizeR", oDrag)[0];
var oB = get.byClass("resizeB", oDrag)[0];
var oLT = get.byClass("resizeLT", oDrag)[0];
var oTR = get.byClass("resizeTR", oDrag)[0];
var oBR = get.byClass("resizeBR", oDrag)[0];
var oLB = get.byClass("resizeLB", oDrag)[0];
drag(oDrag, oTitle);
//四角
resize(oDrag, oLT, true, true, false, false);
resize(oDrag, oTR, false, true, false, false);
resize(oDrag, oBR, false, false, false, false);
resize(oDrag, oLB, true, false, false, false);
//四边
resize(oDrag, oL, true, false, false, true);
resize(oDrag, oT, false, true, true, false);
resize(oDrag, oR, false, false, false, true);
resize(oDrag, oB, false, false, true, false);
oDrag.style.left = (document.documentElement.clientWidth - oDrag.offsetWidth) / 2 + "px";
oDrag.style.top = (document.documentElement.clientHeight - oDrag.offsetHeight) / 2 + "px";
}
</script>
</head>
<body>
<div id="drag">
<div class="title">
<h2>这是一个可以拖动的窗口</h2>
<div>
<a class="min" href="javascript:;" title="最小化"></a>
<a class="max" href="javascript:;" title="最大化"></a>
<a class="revert" href="javascript:;" title="还原"></a>
<a class="close" href="javascript:;" title="关闭"></a>
</div>
</div>
<div class="resizeL"></div>
<div class="resizeT"></div>
<div class="resizeR"></div>
<div class="resizeB"></div>
<div class="resizeLT"></div>
<div class="resizeTR"></div>
<div class="resizeBR"></div>
<div class="resizeLB"></div>
<div class="content">
① 窗口可以拖动；<br />
② 窗口可以通过八个方向改变大小；<br />
③ 窗口可以最小化、最大化、还原、关闭；<br />
④ 限制窗口最小宽度/高度。 </div>
</div>
</body>
</html>