jQuery实现的鼠标拖动画矩形框示例【可兼容IE8】
作者：longzhoufeng
这篇文章主要介绍了jQuery实现的鼠标拖动画矩形框,结合实例形式分析了jQuery基于事件响应及页面元素属性动态操作实现的图形绘制相关操作技巧,需要的朋友可以参考下
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。