本文实例讲述了jQuery实现的鼠标拖动画矩形框。分享给大家供大家参考，具体如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh" lang="zh">
<head>
<title>鼠标拖动画矩形</title>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
<style type="text/css">
body, h1, h2, h3, h4, h5, h6, hr, p, blockquote, dl, dt, dd, ul, ol, li, pre, form, fieldset, legend, button, input, textarea, th, td {margin: 0;padding: 0}
html {color: #000;overflow-y: scoll;overflow: -moz-scrollbars-vertical}
#confirmingAppraisal {
position: relative;
left: 0;
top: 0;
margin: 0 auto;
padding: 0;
width: 800px;
min-height: 800px;
overflow: auto;
height: 1000px;
background-color: #e9e9e9;
}
.dashed-box {position: absolute;z-index: 9997; border: 1px dashed red; width: 0px; height: 0px;left: 0px; top: 0px; overflow: hidden;}
#moving_box {background-color: #0A90DB;}
.question-box {
position: absolute;
z-index: 9998;
/*background: red;*/
/* older safari/Chrome browsers */
-webkit-opacity: 0.8;
/* Netscape and Older than Firefox 0.9 */
-moz-opacity: 0.8;
/* Safari 1.x (pre WebKit!) 老式khtml内核的Safari浏览器*/
-khtml-opacity: 0.8;
/* IE9 + etc...modern browsers */
opacity: .8;
/* IE 4-9 */
filter: alpha(opacity=80);
/*This works in IE 8 & 9 too*/
-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=80)";
/*IE4-IE9*/
filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=80);
}
.question-border {z-index: 9999;border: 2px dashed red;overflow: hidden; }
.del-box {
width: 17px;
height: 17px;
float: right;
position: relative;
margin-top: 1px;
margin-right: 1px;
z-index: 99999999999;
background: url(del.png);
}
</style>
<script language="javascript">
window.onload = function() {
function stopDefault(e) {
if(e && e.preventDefault)
e.preventDefault();
else
window.event.returnValue = false;
return false;
}
function oBox() {
var wId = "w";
var index = 0;
var target = null;
var startX = 0, startY = 0;
var flag = false;
var startL = 0, startT = 0, boxHeight = 0, boxWidth = 0;
var boxObj = document.getElementById("confirmingAppraisal");
var frame = $("#confirmingAppraisal");
var referenceSize = {
"pos": frame.offset(),
"width": frame.outerWidth(),
"height": frame.outerHeight()
}
var newMarkPos = {
"left": startL,////按下时鼠标距离的左边的距离
"top": startT////按下时鼠标距离的上边的距离
}
//鼠标点击
boxObj.onmousedown = function(e) {
flag = true;
var e = window.event || e;
target = e.target || e.srcElement; //获取document 对象的引用
//e.pageY，e.pageX兼容
if(target.src) {
stopDefault(e)
}
var scrollTop = boxObj.scrollTop;
var scrollLeft = boxObj.scrollLeft;
var ePageX = e.clientX + scrollLeft;
var ePageY = e.clientY + scrollTop;
//按下时鼠标距离页面的距离
startX = ePageX;
startY = ePageY;
//按下时鼠标距离的左边和上边的距离
startL = startX - referenceSize.pos.left;
startT = startY - referenceSize.pos.top;
index++;
// 如果鼠标在 box 上被按下
if(target.className.match(/del-box/i)) {
// 允许拖动
flag = false;
// 设置当前 box 的 id 为 moving_box
var movingBox = document.getElementById("moving_box")
if(movingBox !== null) {
movingBox.removeAttribute("id");
}
target.id = "moving_box";
removeBox(target);
} else {
var div = document.createElement("div");
div.id = wId + index;
div.className = "dashed-box";
boxObj.appendChild(div);
div = null;
}
}
//鼠标离开
boxObj.onmouseup = function(e) {
var e = window.event || e;
if(boxWidth >= 1 || boxHeight >= 1) {
boxObj.removeChild(dragBox(wId + index));
index++;
var div = document.createElement("div");
var spanObj = document.createElement("span");
spanObj.className = 'del-box';
div.appendChild(spanObj);
div.className = "question-box question-border";
div.style.left = newMarkPos.left + "px";
div.style.top = newMarkPos.top + "px";
div.style.width = boxWidth + "px";
div.style.height = boxHeight + "px";
boxObj.appendChild(div);
div = null;
boxWidth = 0;
boxHeight = 0;
} else {
if(flag) {
boxObj.removeChild(dragBox(wId + index));
}
}
flag = false;
}
//鼠标移动
boxObj.onmousemove = function(e) {
var e = window.event || e;
stopDefault(e)
if(flag) {
var scrollTop = boxObj.scrollTop;
var scrollLeft = boxObj.scrollLeft;
var ePX = e.clientX + scrollLeft;
var ePY = e.clientY + scrollTop;
var disW = ePX - startX;
var disH = ePY - startY;
var L = startL + disW;
var T = startT + disH;
if(disW > 0) {
if(L >= 0) {
boxWidth = disW
}
newMarkPos.left = startL;
} else {
if(L <= 0) {
L = 0;
boxWidth = startL;
}
boxWidth = (startL - L);
newMarkPos.left = L;
}
if(disH > 0) {
if(T >= 0) {
boxHeight = disH
}
newMarkPos.top = startT;
} else {
if(T <= 0) {
T = 0;
boxHeight = startT;
}
boxHeight = (startT - T)
newMarkPos.top = T;
}
dragBox(wId + index).style.left = newMarkPos.left + "px";
dragBox(wId + index).style.top = newMarkPos.top + "px";
dragBox(wId + index).style.width = Math.abs(boxWidth) + "px";
dragBox(wId + index).style.height = Math.abs(boxHeight) + "px";
stopDefault(e)
}
}
var dragBox = function(id) {
return document.getElementById(id);
}
};
oBox();
function removeBox(obj) {
if(obj) {
var confirmingAppraisal = document.getElementById('confirmingAppraisal');
if(obj.className == 'del-box') {
var objId = document.getElementById(obj.id);
confirmingAppraisal.removeChild(objId.parentNode);
} else {
alert(123)
}
}
};
}
</script>
</head>
<body style="overflow: hidden">
<div class="confirming-appraisal">
<div id="confirmingAppraisal">
<img src="1.jpg" style="position: absolute;width: 1000px;height: 1600px;">
</div>
</div>
</body>
</html>
感兴趣的朋友可以使用如下工具测试上述代码运行效果：
在线HTML/CSS/JavaScript代码运行工具：
http://tools.jb51.net/code/HtmlJsRun
在线HTML/CSS/JavaScript前端代码调试运行工具：
http://tools.jb51.net/code/WebCodeRun
更多关于jQuery相关内容还可查看本站专题：《jQuery动画与特效用法总结》、《jQuery切换特效与技巧总结》、《jQuery扩展技巧总结》、《jQuery常用插件及用法总结》、《jQuery拖拽特效与技巧总结》、《jQuery表格(table)操作技巧汇总》、《jQuery常见经典特效汇总》及《jquery选择器用法总结》
希望本文所述对大家jQuery程序设计有所帮助。
